I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation
Edition: Model Aviation - 1991/10
Page Numbers: 89, 90, 91, 92, 175, 176, 179, 180
I CATO THE CENSOR Roman orator obviously possessed modeling spirit once proclaimed astonishment two weather forecasters could greet other keep straight faces Catos disdain meteorologists Greek words meteor meaning creates outlandish weather prediction gist meaning roll floor seized laughter stemmed official duties protector Roman culture against Greek influence fair speculate however also less thrilled fictional weather forecasts time234 149 BC Today has changed Modem weather forecasting meticulous expensive demanding pursuit performed thoroughly trained scientists Armed computers other highly accurate sensitive instruments photographs space track weather systems help keep nations transportation network running safely time predict droughts floods other weather dangers Any meteorologists caught rolling ground fits laughter pursuing exacting technologies definitely havent reported Weathermen generally make life easier predictable pure cleansed unwashed masses October 1991 89 -F signt OT moasi s.noueiiea ugwnrn nu risIng sun may reason enough fly dawn its also chance pick up nints wow coming day corona around sun examole indicates chanee weatherusually always precipitation Give RC Sailpianer sky full cumulus anytime fellow catches thermal therell likely cumulus cloud sitting dIrectly atop column lIft satellite weather map National Weather Service modelers Nebraska flight test umbrellas RC Soaring fanatics Free Flight thermal seekers central Kansas prob ably launching planes six-pack green air leading storm fronta welldeveloped cumulus mass appears rough bumpy photo 90 Model Aviation ulrrus clouas usually mean lair settled weather fewer weaker thermals Cirri form narrow bands generally ac company low-pressure system can por tend deterioration weather Most modelers fall least categories true cant forecasters get weather flying field right Well can nt said Mike Thompson meteorologist KCTV-TV Channel 5 CBS affiliate serving Greater Kansas City area doing more mesometeorology weather study Ah.bunches cumulus bright blue sky Soaring Free Flight fanatics live days like Photos Roy Inman Above cumulus clouds draw together theres lift peak sink rifts called cloud street model thermals lift Full-scale pilots can control speed porpoise along street Below Exiting thermal clouds break span /1 7/ K R2/$0P9i8 068908 006314if 11930 983 II 190/19 ~---E 1 IIIIN 23/20 0 q321P9 198 068 P14108 0 P P14 POS 90631489314 9288 PtS1408 \ / -1 3i 18110 / 102 /20 00 1Z/20 P9 1989L9 0068 P14109 0 P P9 90 8063149939 11929 98314 3089 PtP14 T P6~CST 88100 062/20 81408 U 1P OF COW C 0068 PSITYP P14809 806314 99449 PtP14T 88100 062/21 National Weather Service charts easily obtainable moat modelers show wealth information keeping weather log AM Weather Show 15-minute broadcast local public television stations often features charts showing precipitation temperatures locations high low pressure systems includes briefing full-scais pliots Enterprising modelers could use VCRs log daily shows throughout flying season Since weather patterns tend repeat could check out say last Junes segments idea what expect June Sure beats reruns Nuts Landing Falcon Crust Charts courtesy National Weather Service -ii4 /oq/ 7A -&&519q - 7676 7 271081 77663%366~8 9069 932~/~-6N 73 --1i 7--~8979- 6 6/~A 969676- 1- 7oa3N\ _ 19k V089 O32YEk r_ ~ ----y 008987808L9 2l449 l9Et8S0J/}~ 93 89113 8Eb \912P9 1989 1L-~ -6576 8076-l190.--84314 -i 6o 069yI6~67 W321J79~~68 69a 2838ojJ \687 63 -O 86 8~ 78 7817 7/1 7 89 /8276 83 3089-943 T U8E~Y996 8883 001F8 9bW141080t8808148-430 88100 T44~013P8 1989 C1 032 ~5 -443 6 50 - /96~- 40 s ~37L11 . 91\06 3 98 15.-989---~K 8, 61836 6 \4/- 6730~}9858 59\66 5O9~T~9 ri9E / 67665\56X65 88113 180P9 1989 89 09E88T63f YIKIs U OWl 0004 23 O-L ~72 493 8.-JitY4 9659~4 9 8-92@Sj9 840 59 8t49~-~ 98399241o 9~60 /255189 6 -J- - 943 8-9 V66 001119 06 814 08140880888130\1/ P9 1989 4 October 1991 91 MORE ABOUT THERMALS ALAS elusive thermalso mysterious invisible useful much demand wasnt always pioneering glider fliers thermals simply rising masses air currents floated liltingly plain hillock lofting birds bugs bramble August day 1926 German pilot Max Kegel surprised gliding mavens little involuntary cloud soaringand suddenly thermals new cachet Flying slope winds off Wasserkuppe late summer day Kegel fellow gliding club members expected little short tour updrafts gentle landing valley below Instead Kegel flew about 30 milesa startling revelation transformed predictability gliding sport art science soaring Explaining finding utilizing thermals became all-important Two essentials Sailplane pilots should know about thermals Soaring virtuoso Joe Wurts owns 98 percent lends Dave Banks Seth Dawson Rich Spicer Larry Jolly leaves rest us fending remaining few As study thermals generally agree simplest equation produces thermal involves heat source air Most thermals modelers familiar generated sun heat source ground surface air thin gas money disappears sun heats ground ground heats air closest conditions right heated layer air eventually breaks away rises air poor conductor heat Thats surfaces warm faster stay warm longer surrounding air As air rises cools eventually collects airborne sailplanes its return lower altitudes No two thermals alike Retired meteorologist pilot man-carrying sailplanes Charles V Lindsay puts way sun shining thermals will rising explained Lindsay retired National Weather Service 10 years ago soar write Anytime actually have heating below cooling aloftwhenever ground warmer [than air]youre going have thermals Such convective cycles can exist sunny days ground air layer hazy haze simply heated air barometer high may much [lift] would impossible get no lift may days youll see buzzard soaring might able stay up Generally Lindsay added thermals can sustain full-scale sailplanes begin forming about 11 am Thermals capable keeping models aloft begin much earlier hour Numerous weak thermals fire up mornings As sun climbs higher become less abundant much stronger Thermal shape matter speculation Basically thought two types bubble vortex rings dust devils Some soaring pilots maintain swirlingand usually dust-filleddust devils differ standing column thermals can round looking down also globular Lindsay says Usually think cone-shaped masses rising air no two alike thunderstorm big thermal possible thermal mass float along until joins another gain strength also possible thermal take form big thick floating potato chip would relatively spread out its lifting area would thin cooler sinking air around thermal weaker warm rising air Lindsay observed Its about third strong thermal bad news covers larger area strong wind destroys thermal uniformity mixing cooler air rising mass Its hard say what [windi speed too fast depends several factors wind altitude may stronger weaker [the windi near ground would affect whats going Under right conditions some thermals can very strong break up would take lot wind Thermals West though less plentiful other parts country quite powerful reach high altitudes particularly true desert areas Midwestern Eastern thermals substantially weaker far numerous youd like learn about weather especially thermals read Lindsays excellent Handbook Soaring Meteorology Charles could persuaded send copy book exchange $1995 plus $175 postage Start persuasion process writing Charles 1030 Colonial Meadows Way Virginia Beach VA 23454 intermediate-sized area its relatively new field us arent point yet can predict weather backyard According Peter Chaston supervisory meteorologist National Weather Service Training Center Kansas City Missouri effect budgetary limitations lack capability Chaston says since predicting weather backyard specificity requires onsiteand expensivemanpower instruments work usually done private meteorological services Certainly few modelers can afford such luxuries course leaves do-it-yourself method way life modelers may seem absurd us fliers match wits might National Weather Service NWS its really process cooperation rather competition Tools task include inexpensive barometer measuring air pressure thermometer something other Continued page 175 92 Model Aviation Sailpianing sky filled cumulus clouds iic ** 4620 CRANDALLLA34ESVILLE RD5 CORYDON INDIANA 47112 e selection Aemote Control Model Airplanes professional IM LISTED BELOWIn Business since 1973 PRICES SUBJECT TO CHANGE WITHOUT NOTICE IS JUST FEW OF THE MFG WE STOCK HOURS MONDAYTHRUTHURSDAY9AAU 5PM FRIDAY9AM-2PM CLOSED SATURDAY& SUNDAY E 812 366-3141 A-JUSTO JIGFOX___________________________________________ AMBROIDFUTABASONIc-TRONIcSSTAFFORD KiTS AVAILABLE SHORTLY ARCORUBBERBANDSGOLDBERGSTERLING BRIDIGAS MODEL PRODSULLIVANB24 TWIN COMANCHE COMANCHE & MORE DAVEYS SYSTEMSHALLCOTOP FLITE $1 COVERITEHOBBYPOXYVS ENGINES1995 ACRO ruKi DEVCONHOT STUFFLANIERStafford DREMELK&BMFGMILLER$0 ALT SPOSI PATTTRN oe TNGINTS DU-BROSIGNORTHEASTSMPLFE0 TAbS & SPRUCE CON TTLJC OON DYNAFILITESAITOZINGER PROPS TOXTO 510 MOLOED COWL PANTS WINDONITLO complete listing etcplease send stamped self-address enve lope DEALERS WANTED FKKITS IGLWP NStsckum Buildum & Fiyum need help call us arf/fiberjdassl lgt box AFTER HOURS CALL WE MIGHT BE HERE use geI THANKS FOR YOUR BUSINESS BILL & JOYCE STAFFORD AIRCOUPE $9995 4I a. 8 U 9 5 Weather/Manley Continued page 92 sagging silkspan measure humidity Weather watching daily basis ideal keep track major weather systems watch weather maps published local newspaper shown television Note location high-pressure low-pressure systems relative flying field example Chaston says thermal seekers flying fields western edge high-pressure system ideally located system departing air becoming less stable convective Convection caused unequal heating earths surface As heated air becomes less dense cooler air expands rises denser cooler air sinks ground replaces warmer air cycle expected continue next eight million years After noting location pressure masses check home field barometer thermometer wind direction Keep track humidity 9OXFYTDAAFJ PLOTS Scde afting md Scavting Services 3 Views D-TECH SYSTEMS Catdog stoc 8 possible dew point higher predicted wind speed might indicate weather front closer expected pressure system came left different schedule Dew point way temperature condensation begins useful tool measuring days flying potential weather marginal Specifically dew point temperature air must cooled constant pressure moisture content bring about state saturation temperature dew point meet temperature falls below dew point fog can develop example temperature 55 degrees dew point 50 five-degree tumble temperature will result air saturation can mean fog rain looking big weather picture bit old folk wisdom can useful weather map unavailable Face wind point right find low-pressure system also useful signaling turn high barometric reading may indicate fair weather wont itself tell about prevailing wind conditions could anything strong winds highly stable air few thermals virtually no wind Similarly high morning humidity might followed good midday burnoff lots lift can just easily mean air will remain heavy day No single factor determines weather 80 90 4-strokes unpiped 60 2-strokes 6 1/4 lb 700 sq Excellent design serious acrobatic pilot Terrific vertical performance Fly smooth aerobatic routines constant slow medium speeds11015 88th St Mira Loins CA 91752 Order Direct 1 800 243-3384 e AEROBATICS Corn050 Performance October 1991 175 II4-w- W1 Pre-built kit $225 Ready finish kit $325 Ready fly $650 PRECISION MODEL PRODUCTS qd $N Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize 1T-150-B 1-1/2 11-175-B1-3/4.. 11-200-B2.. TT-225-B 4. TT-226-B2-14 FAll 11-250-B2-1/2 11-251-B . 2-1/2FAI .. 11-275-B 2-3/4 TT-276-B /4 FAll TT-300-B 3 11-301-B3 FAt T1-325-B 3-1/4 11-350-B3-1/2 11-375-B /4 TT-400-B 4 RetailApprox PriceWeight $1395058 1495 095 1595 .. 100 1695 .. 160 1695 . 150 1695 .. 190 oz 2095 2295 220 2495 2695 260 2895 250 3695340 az 4995 oz 5995.520 oz 6995570 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize 11-140-A1/4-28 TT-147-A1/4-28/7mm TT-610-A6 x 1 0mm TT-710-A7 x 1 0mm 11-516-A5/16-24 IT-SiB-A5/16-24/6mm TT-810AOx 10mm TT-825AOx 1 25mm 11-375-A3/8-24 11-125-AlOx 1 25mm RetailApprot PriceWeight S495 495 061 495.063az 495..062az 495 076oz 4 95076 495... 076 495075 595117 595115 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 LIGHTING SYSTEMS THE #RED 01 #RED 02 #RED 03 #RED 04 #RED 05 #RED 14 #RED 16 #RED 23 ORIGINALS. Still Programmable Flashing Navigation Lights Adjustable Rate Strobe Light Landing Lights Adjustable Rate Mars Rotating Beacon Marine Navigation Lights nonflashing Big Airplane Navigation Lights Econo Landing Lights brightest Real Strobe Light true zenon strobe 0 SEE YOUR DEALER S SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally send check money order full credit card cost item plus $2 DO 15500 foreignl immediate shipment Include full address UPS Sorry no COD qam 4736 N Milwaukee Ave ago IL 60630 Modelers should take measurements watch sky Cloud formations perhaps best weather indicator Meteorotogists ctassify label clouds several different ways High clouds given prefix cirro middte-layer clouds prefix alto Low-level clouds take no prefix Weather scientists however classify clouds precipitation comes nimbus Nimbi Meteorologists also divide clouds two major types stratus cumulus Stratus formations flat layered modelers point view usually devoid useful activity Cumulus also called cusounds like letter Q clouds puffy active indicate rising air cus welt defined fat seemingly boiling tops rising air currents will strong usually well defined other hand wispy less defined around edges chances thermals will choppy harder find difficult center Sailplane Surface winds also will gusty erratic day high steady barometric readings cirrus strands stratus perfect day renewing friendships good folks identified legal documents spouse siblings offspring other words probably will lousy day thermal hunting Cirrus cirrocumulus cirrostratus Best $2495 $1995 $3995 $1995 $1095 $2495 $1995 $2995 high-altitude layered clouds usually found 20000 40000 feet above earth Middle-level clouds altocumulus altostratus mostly between 6500 20000 feet Low-level clouds ground 6500 feet include stratocumulus nimbostratus stratus Cumulus cumulonimbus can occur low levels identified chiefly vertical development Heres guide distinguishing among types cloud formations what portend about weather field Cirrus clouds thin wispy fibrouslike Often called mares tails cirri formed warm moist tropical air lifted altitudes cold enough produce ice crystals clouds quite light thinand associated cirrostratus altostratusthey usually indicate fair settled weather Long narrow bands cirri however generally associated low pressure can signal weather deterioration Sailors interpret such formation either major weather system approaching west warm front heading southwest case cirri cut down amount sunlight reaching ground means less ground heating fewer weaker thermals Continued page 179 OHIO RIC 4008 FULTON AVE DAYTON OH 45439 PH 513-299-8623 176 Model Aviation PROP NUT ADAPTORS V Kif No 111 THE ULTIMATE 10 DASH 3005 Built-Up$695. Visa att BluC-GILB 62 Wing Span 1300 Sq 12-16 Lbs 12 to 23 2 Cycle 120 270 4 Cycle Convenbonal Butft-Up Constructton Precision Machine Cut SIG Balsa Plywood Parts Fiberglass Cowl Wheel Pants Clear Canopy Formed Main Tail Gear Formed Cabanes Full Hardware Pack Detailed Instruction Book 3-views Rolled Full Size Plans Full money back guarantee Send three 29 stamps addftional kit info Cirrostratus layer high stratus similar cirrus thicker uniform construction usually found 25000-to-30OO0-foot range often produces halos around moon sun clouds thicken become altostratus rain way Cirrocumulus clouds often called mackerel sky form small sometimes puffy white masses blobs may take flakelike shapes arrange themselves groups lines Cirrocumuli usually fair-weather indicators also can go vertical develop strong lift mackerel sky effect signals changing weather patterns Altostratus often linear stripelike cloud formation found between 13000 15000 feet clouds preceded cirrostrati cirri rain near certaintyhence nickname watery sky Altocumulus clouds reveal instability atmosphere usually harbinger rain Found 12000 13000 feet ball-shaped can form bands lines Stratocumulus clouds typically form layers patches can display wavy appearance Often called winter sky clouds stratocumuli usually accompany choppy windsand usually get way good thermal development Nimbostratus low layer uniformly shaped cloud mass generally evolves thickened layer altostratus often produces steady rain snow clouds break up little fragments known scud trail behind rain Cloudbases characteristically form between 2000 6000 feet Stratus frequently forms below nimbostratus hangs around just above ground level Thin stratus resembles fog thicker stratus can produce sprinides drizzle Cumulus formations flat bases exploding tops good Lords gift Free Flight Soaring communities well-defined cloud mass looks like ball cotton its top shaped like head cauliflower Cumuli mark thermals days clouds show good vertical development dont surprised see manhole covers float out sight modeler flying manhole covers conditions should make sure AMA number name address firmly secured underside craft Cumuloaimbus formations represent too much good thing overgrown cumuli produce downpours hail wind lightning thunder subcompact cars other weather objects Modelers fly under cumulonimbus generally have Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINTQUART GALLON 00/0 Nitromethane $995 5% Nitromethafl$325$495$1195 100/0 Nitromethafle $395$535$1395 150/0 Nitromethafle $395$625$1595 25% Nitromethafle$495$795$2095 350h Nitromethafle $595 $895 $2595 SIG PREMIUM 4-STROKE FUEL 100/0 Nitromethafle$1325 150/0 Nitromethafle $1525 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPriCes sobiect chenge witboot nOtiCe See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 intelligence levels no higher tree stumpsand shortened life span further research myriad weather books can found local library University bookstores often have meteorology texts addition valuable how-to stuff books have excellent cloud photographs Make list cover bases 1 Check instruments daily basis Keep track what tends happen during flying season Elements National Weather Service forecasts based logs records kept over years 2 Watch sky Photocopy cloud pictures books other sources Keep quick-check reference handy can track what happens cirrus gives way cirrostratus altostratus Rain way usually follows 3 Watch television weather reports adjunct own weather-predicting efforts Youll likely surprised accuracy 4 Dont bet Kansas City Royals win 1990 pennant As Peter Chaston says its just matter October 1991 179 NEW ~~CYCLE 5SERIES 100 jTHP DESIGN 5 p hi TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIAPITCH THP 1266778 136771/20 146778 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION lOTO 20% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUELPROOFHIGH LUSTER FINISH DIAPITCH 534 634 72833Vz456 8334568 84566/,7 94566A/x77 1045667 106W8W 10BEW 115W 116EW 1167 124W 125W 12 56 13 56 14 56 15 56 16 4N 16 678 RC PYLON RACING SERIES 500 DIA PITCH 7 5N5N 8I 677/8 SERIES 400C 866777 97/z7/ W WIDE BLADE EW EXTRA WIDE N NARROW Original _____ J E-ZUP •8x81Oxl 5 Up 1655 60 Iuo6rS cuslom onosseconds! No ropes Ilettering availablenothing assemble! m r yn m 31 RAVENW000RD VERSAILLES KY 40383 knowing what has happened what happening learning anticipate what will happen regular basis Air cant created destroyed Chaston reminds us has go somewhere Nationals/Linstrum Continued page 98 forward high pointvery efficient Wakefield climbed swiffly about 90 ft three times soared 219 dot Dave got terrific plaque AMA Indoor Wakefield flying Two specialty events attracted handful fliers Frank Kieser won Ornithopter 1409 Tom Vallee aced Helicopter amazing 1109 Chuck Markos aced Peanut Speed reliable Dayton-Wright Racer swift 14 mph did 142 mph Goosey win Unlimited Speed 14 bucks Hardy Brodersen Ed Whittens creation Indoor Bostonian seven grams charisma proved incredibly popular 45 entries Top flier Dave Aronstein lofting attractive Boeing-logo 77 design amazing flights 446 502 Chasing him Richard Miller Blue-Fin earned 116 flight total full minute less noted five 7-Up designs flying generally wide variety MASKING MASTER IVTM FINEST QUALITY MARRING & FINE-LINE TAPE TAPE EVER AVAILABLE TO MODELERS * LOW-TACK FINE-LINE * LEAKPROOF * CONFORMAL EACH KIT CONTAiNS ONE 36 YD ROLL VINYL MASK 3/16 ONE 72 ID ROLL POLY MASK 1/4 ONE 36 ID ROLL VINYL MASK 1/4 ONE 72 ID ROLL POLY MASK 3/8 * FOR USE WITH LACQUERS DOPES EPOXY POLY-U AND ENAMELS ATISFACTON GUARANTEED MB N. 555 ADD 7% SEND TO TECHTAPE MASKING TECHNOLOGY PO BOX 230 LIVINGSTONNJ250 07039 S & H INCLUOSOCI-IEOK OR MO models John Blairs Boston Zip Code zip numbers registration numerals Now thats charisma Burr Alice Stanton Louisville created monster sponsored E the new unofficial Mini-Stick event entry hallway neat computergenerated display rules various contemporary designs maximum seven-inch spans 25-in chords 10-inmax QAL bearings rear five-inch motor sticks max 50% stabs all-wood props unexotic materials highperformance Indoor models indeed mass launches looked like swarms insects headed girders Some reached roof certainly far cry parlor flying event Tom Vallee originally envisioned Kit Plan Scale fliers Paul Avery Louisiana John Blair Warren North Carolina top two places locked up 8 am Averys yellow bird condenser covered weighed eight grams floated first place Blairs Heath Midwing 1937 Peerless plan beautiful much heavier IMS kit Daphne dropped 1989 score 94 points 78a crippling blow time cap 104- 108-second flights 78 seconds possible noted another Daphne flier craft score 15 out possible 40 Whew judges discriminating Continued page 184 THE LEADER IN COMPETITION PROPELLERS QUICK-BUILT SUPER TOUGH Quid-Built Super Tough AirCore 40 family Trainer NEW VHS VIDEO CATALOG $695 &h Texas residents please add sales tax US ACorej 4576 Claire Chennault Hangar 7 Dallas TX 75248 1-800-336-0602 orders 214 250-1914 info 180 Model Aviation