RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO
Edition: Model Aviation - 1990/06
Page Numbers: 48, 49, 156, 157, 160, 161
RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO
Edition: Model Aviation - 1990/06
Page Numbers: 48, 49, 156, 157, 160, 161
RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO
Edition: Model Aviation - 1990/06
Page Numbers: 48, 49, 156, 157, 160, 161
RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO
Edition: Model Aviation - 1990/06
Page Numbers: 48, 49, 156, 157, 160, 161
RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO
Edition: Model Aviation - 1990/06
Page Numbers: 48, 49, 156, 157, 160, 161
RETURN ISR Thats right Interna tional Slope Race back After few years nonexistence due various now unimpor tint reasons famous exciting Slope event around will held again year Mark calendars arrange vacation time weekend July 7-8 1990 youre interested watching and/or participating competitive exciting aspects sport big-name pilots will Dav enport CA including Daryl Perkins Rich Spic er Ron Vann Mark Allen st goes on us excited about return ISR grateful hard work persist ence John Dvorak person respolisi ble its resurrection few months back John sent out proposal organize Slope Race pilots West Coast particular Califor nia proposal Goal 1 provide annual international Slope Race 2 sponsor three regional Slope Races during year three differ ent sites northern central southern Califor nia 3 encourage Soaring clubs include Slope Races contests Elements Organization 1 Made up Slope Race pilots interested people Califor nia would willing support annual internatiunal Slope Race regional races 2 Would provide management secure personnel required run annual international Slope Race run regional races Contest Di rectors flaggers scorekeepers matrix makers publicity etc 3 Possible race sitesDaven port Los Banos Santa Maria 4 Soaring clubs would encouraged help provide slope sites support personnel communication 5 Contest fees could cover expenses such tro phies slope site support equipment commu nication start-up costs could raised membership dues organization 6 AMA affiliation insurance contest status After proposal got things rolling thing seemed fall place has resulted formation California Slope Racers AMA chartered club ISR will clubs first officially sponsored event CD will Ki 10 ELECTRA B3 flsned NIC WaIGMT MArCkk 1985 In4 uscSlOfl Talplane seotiell Mm un1oadnS towing point 3374 1W002 14* oz/uqft 30% MC 30% MAC 2 ii 21 see dedicated Slope Aacer Electra B3 great example Sloper ox traordhiaire F38 Champ Nic Wright designer Very basic very simple very fast Ray Kuntz Daryl Perkins assistant things CD no doubt everyone involved some fabulous slope sites located hoping see ISR return staius suc- throughout California Oregon Washington cess its prime also hoping other states would serve outstanding loca will stepping-stone bigger better tions future races Imagine will rac ing circuit includes half dozen races spaced throughout year variety sites awatds individual events Well season championship Will something like ever happen really think its possible As have said number times before Slope Soar ing just continues io grow series races like seems though could part its nat ural evolution youre interested International Slope Left Mark Aliens new Swift 800 Swift cross between Marks popular de signs Falcon 880 Nisus future column wili expand F3B/Sldpe Racer Center Using state-of-the-art construction all-glass Yahoo fun-tofly F3B ships things work planned Michael Forster wili soon make Yahoo available Right mere $600 six months wait can get hands 8 Mueller Comet world-class F3B ship will make think twice about flying others 48 Model Aviation Radio Cono1 Slope Soaring Mark Triebes 20794 Kreisier Cs Sarawga CA 95670 Race just Slope Racing general can get touch John Dvorak 1638 Farrington Court San Jose CA 94087 Eleetra B3 number months back John Dvorak purchased great new Slope Racer England follow Slope Rac ing youre probably already aware Electra B3 its reputation dominant plane Eu rope youre following piece Nic Wright should definitely get atten tion Both article accompanying three view appeared issue White Sheet newsletter White Sheet Radio Flying Club England 1986 modified N1C831 Pylon Racer built using E374 wing section creased span 84 David Hedley Scot land airfoil section thought accu rately reproduced good performance new F3F class anticipated Indeed test flew model pleasantly surprised both its turning ability its straight-line speed same time both Andy Lewis Tony Leach flying 100/120-in-span F3B models slopes Scotland also used E374 looked bit good Electra D3 particular convinced certain conditions Andys model performed better E182-winged Electra D3 would slow up alarmingly turns pulled too tight low speed February 1988 designed new F3F model using similar planform D3 based Electra B fuselage using E374 section third model employ fuselage hence became Electra B3 de signing model attention waa paid sim plicity construction also using tech nology associated F3B models fuse lage employs full layer Kevlar cloth has proven model saver F3B Its ac tual necessity F3F models landing safely sites like Edge Top Derbyshire joined wet wet mold tricky pro cess provides unrivaled strength reduced weight wing has epoxy pressed-veneer skins blue foam core full glass interleave Wooden spars incorporated slots blue foam beneath glass interleave provide necessary strength ends wing pan els capped improve torsional stiffness ducts cut wing accept servo wires before skins pressed Tailplane construction follows wing prototype fitted operational rudder assist Aerobatics winch launching F3F rudder totally redundant Test flights date have revealed B3 holds its speed through turns better D3it also has formidable aerobatic perform ance puts different class Continued page 156 SHOOT YOUR ENEMY DOWN LANDER RCs P51 Sport CAT NO 74112 THE ORIGINATORS OF ALMOST-READY-TO-FLY AIRCRAFT MADE OF PLASTIC AND FOAM Fuselage Length 45 Rec Engine Size 45-60 4 Stroke 80-90 Flying Weight 6 lbs Wing Span 63 Area 630 sq Radio Channels 4 Available favorite Hobby Deaier Replacement parts available Dealer distributor inquiries invited WrIte today free color catalog PO Box 458 Oakwood Georgia 30566 Made USA 404-532-6401 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/4 unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adjusted 44 6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 0% 100% failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3995Introductory offer $2995 APPLIED ENGInEERING 214 241-6060 PO Box 5100 Carrollton TX 75006 division tenesuch corporation Prices oottlsct chone notice June 1990 49 Its lean Its mean Rich Spicers Syner gy Ill all-molded Sailplane has potential successful Slope Racing circuit its F3B circuit CATALOG SAVINGS Send FREE catalog see yourself supply over 2700 sizes grades Low Low Prices Density Graded Color-Coded Quality Balsa Satisfaction 100% guaranteed later youll see need FULL BODY PILOT KIT DARNED GOOD AIRMEN Contains pilot head hands boots helmet Lightest pilots available Lifelike vinyl latex rubbercap goggles full templates easy instruc- tions Easy assemble finish Some simple sewing required Fully Build Sportsman Barnstormer Full Body Bust ositionable too BUST PILOT KIT Price Contains pilot head helmet sport cap goggles#206 acae895 jacket Easy assemble finish#205 scae995 PrIce#204 scae095 #108-iA scale NEW 595#203 acae695 #106-/ scale695 #105-% scale. 795 SinS-lA scale. 895Some 1495 ewing quired SPECIALISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S074S& 09S ALL CUS TOM & STOCK PARTS VAILABLE INDIWDUALL V COMPETITION ACCESSORIES & CUSTOMIZED K&B ENGINES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF FUEL TUBING FOUR BRANDS OFGLOWPLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 12 COLORS QUALITY DOPE BRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOY SR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES JET PILOT KIT Pilot has molded jet helmet Contains face mask oxygen hose Extreme ly Realistic Weighs less oz Price #308- scale 595 #307- scale 695 ORDERING INSTRUCTIONS See dealer first order direct Add $100 shipping NYS residents add 7% tax Send check money order CODS OK Send $100 catalog Radio Technique/Myers Continued page 119 Whatever suppose inspires club skeptic doubt people out eyeing Aircraft Only unused chan nels trying figure out take away us Lets say local skeptic says So What OK point out him reason wants keep channels forever can continue use obsolete equipment will see interference anybody else using odd-numbered channels So keep ing fellow RCers off odd-numbered channels doesnt protect old junk just gives away hobby channels forever thinking presents same risks us does boaters RC Aerobatics/Van Putte Continued page 45 regular sunglasses Safety Plus glasses dont need use Rons thoughtful gift rediscovered something recently deserves passed Since Im between Pattern air planes right now wanted some flying during judges training sessions clubs annual Pattern contest decided prepare old sport airplane fly airplane hadnt flown several years aileron-to-wing gap sealed normally seal aileronwing gap Pattern airplanes con sciously reflect Well first tempt Pattern flight sport airplane re minded gap should sealed After flight judges commenting jerkiness constant corrections observed roll axis during looping ma neuvers airplane Bingo hit reason seal aileron-wing gap leaks air Sometimes gap leaks both wings other times leaks wing necessarily same wing time causes airplane unstable roll dur ing loops since wing leaking gap loses lift Lesson relearned Seal aileron-wing gap stability roll during looping maneuvers RC Slope Soaring/Triebes Continued page 49 run-of-the-mill 6-ft-span kippers attempt quantify its F3F performSee Dealer add Dol dit-ect order handling ance group us have conducted trial over F3F course local slope typically Brit ish Slope weather ie some good air some bad air etc results show B3 bit good D3 won Viking Cup event Derbyshire 1987 have maintained unbeaten record domestic F3F competitions nearly two years new model particularly suited reversal tech nique unusual amongst F3F fliers has certainly proved effective especially steep lift gradients Airfoil design testing debate over what airfoil best use given set condi tions has existed long airplanes have flying certain airfoil may have particular ad vantages low speed may also have some definite disadvantages high-speed flight An other airfoil might just opposite being ideally suited high-speed work Yet another may compromise between two work fairly well conditions However look now have virtu ally endless list airfoils choose can get exact performance parameters looking Much recent work airfoil design US has done Michael Selig John Donovan results testing have sparked what seems endless debate accuracy airfoil testing its application real wings Im going go intricate de tails criticism testing has elicited short explanation testing techniques re sults Selig Donovan another member airfoil research team David Fraser Heres what Michael John David say June issue Slope Soaring News article 5D6060 article quite informative few points need amplification couple wrong Im hoping can clarify points First statement [Reynolds number] refers number air molecules flowing across wing Simply put larger number air flows over wing correct Reynolds number usually abbreviated R Re Rn measure ratio inertial forces fluid air example viscous forces Osborne Reynolds hydraulics engi neer England late 1800s investi gating flow characteristics channels pipes discovered dynamics flow dependent size speed provided certain quantitynow called Reynolds numberwas held constant 156 Model Aviation OUR REV-UP INVENTORY VERA GES OVER 9000 PROPS I! IMMEDIATE SHIPMENT ON VISAIMC ORDER BY MAIL OR PHONE 519 728-4355 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING & HANDLING FEE $200 FOR INSURANCE ADD $100 STOCK ORDERS SHIPPED WITHIN 24 HAS major discovery meant possible investigate virtually size fluid flow having construct full-size mod els provided Res both full-size model flows same actual quantity discovered Re ity x Length x Velocity Viscosity wing length usually taken chord velocity freestream density viscosity course fluidair case use feet feet/second length velocity sume standard sea level conditions air equation reduces Re 6365 x V x Chord important point modelers two airfoils operating same Re doesnt matter what actual wing chords speeds fact doesnt matter fluids same wing might fly air model could tested water Consequently us test tunnels can use single standard chord models vary air speed get particular Re other words isnt necessary duplicate exact chords model wings full-size wings long Res same wind tunnel Princeton used 12in chord get Re 100000 standard mospheric conditions airspeed 100000 V ________ ft/sec 6365 x 1 about 11 mph wing has 6-in chord would need fly about 22 mph get same Re because similarity flows con stant Re regardless actual physical size scale wing would behave exactly same 22 mph test section did tun nel 11 mph drag coefficient Cd given lift coefficient Cl would same wing would stall same Cl other flow-related characteristics would also same So results wind tunnel di rectly usable though sections did have same chord yours need match Re second point amplification Princeton models tested five Res just three 60k 100k 150k 200k 300k k means 1000 Some airfoils tested Res third point concerns flow around laminar separation bubble As ar tide stated flow low Res breaks away wing somewhere near high point airfoil flow leaves surface lami nar later becomes turbulent air foils turbulent boundary layer reattaches long before reaches trailing edge extent separated flow strongly dependent Rethe lower Re longer detached re gion 60k separated region might long 40% chord 300k separa tion could small 2-3% addition air under separated region turbulent article says almost stagnant Turbulating stagnation region air blown through small holes wing way tripping flow sometimes used full-size Sailplanes problem separated flows eventually make transition laminar tur bulent flow way sucks up comparatively large quantities energyenergy must supplied airplane shows up drag attached turbulent flow thickness boundary layerand hence energy contained itgrows steadily comparatively slowly However separated laminar layer transi tionsto turbulent becomes thick highly ener gized layer contains far energy equivalent turbulent layer Another way consider drag due separation bubble follows separation bubble present reduced pressure upper surface airfoil would recover smoothly would increase ambi ent pressure TE approached However stagnant region stops smooth recovery length bubble thus pressure un der bubble lower would bubble low pressure together shape airfoil acts pull airfoil back wards increases drag investigated two different ways allevi ate separation bubble problem first designing shape airfoil minimize extent bubble keep separated layer thin shorter thinner layer absorbs less energy longer thicker layer transi tions therefore produces less drag second method force laminar layer transition before separated using triptypically strip tape about 0020-in high upper surface wing somewhat ahead point separation would occur out trip Turbulent air stickier lami nar air tends stay attached wing So Continued page 160 June 1990 157 THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Includec4 60 Inches 545 Sq Inches Leisure 05 Electric fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 PERFECT PATTERNS Fly perfect patterns time F&Es very affordable fiberglass-and-foam pattern planes Vertigo II oldie goodie 65 span 50 fuselage 600 total wing area Designed 60 power Trike gear Kit IA-i 038 $10995 plus shipping Phoenix V VI proven trophy-winners board Ihe renowned Don Lowe Choose 3 sizes power requirements suit own competitive needs Phoenix V 40 Kit IA-i 026 $8995 Phoenix V 60 Kit IA-i 027 $9995 Phoenix VI 80 KitIA-1028only$10995 plus shipping Cure-Air aerobat anhedral 641/2 span 680 l wing area Special anhedral stabs make Cure-Air behave like dream right side up upside down 60 power Kit IA-I 006 $10995 plus shipping P&E kits feature precision-molded fiberglsss fuselages bslsa-covered foam wings reduced weight Write call F$1EE catalog pattern pisnes stand-off scale current clessic warbirds snd t ne todsy sworth JI 1836 Stout D vs nsfer PA 18974 675 9882 though turbulent flow has higher drag laminar flow has much less drag sepa rated flow Both methods work airfoil has large separation bubble trip will usually improve its performance least values Re below 200k book about experiments Airfoils Low Speeds Soartech #8 can see excel lent example drag Miley airfoil reduced factor four using trip al though kind dramatic drag reduction typical popular RC Soaring airfoils airfoil thst prone large bubble losses properly reshaped will usually reduce drag incurring penalty high Re something can problem trip reshaping used SD6060 change surface might seem much its important fact its good illustration necessity building ac curately Little errors wrong place can have significant effects Finally seems some confusion tween squared-off tail ends race cars trailing edges airfoils Race cars squared off reduce drag reduce lift last thing race car needs car matter long thin tail Such shape pro duces lift decreases load wheels increased drag accepted because loss traction would catastrophic speeds cars travel Thats reason frequetnly use airfoils lifting downward over rear wheels get better traction airfoil car drag less thin trailing edges difference isnt much shows up higher end low Re re gime measurable measured Lets hope discussion will help everyone understand some practical points airfoil testing realize like everyone else its easy fall prey airfoil month dis ease think some newer designs will long run prove better older designs After what now call older once brand-new too youre interested getting copy Soartech #8 includes over 400 pages complete formation airfoil tested Princeton coordinates polars lift drag plots comments airfoil get touch Herk Stokely $15 checks money orders payable HA Stokely Herk will get copy off address 1504 North Horseshoe Circle Virginia Beach VA 23451 Sharp vs squared-off Well weve gotten viewpoint sharp trailing edges vs squared-off trailing edges boys Princeton also received letter Thd Noel Florida another supporter razor-thin trailing edges Heres what Ted say subject read interest comments sharp vs squared-off trailing edges drag men tion Dick Vader sands trailing edges paper-thin reduce drag contrast Glider de signers square off trailing edges fashion similar automotive practice re ducing drag careful examination rea sons autos have squared-off tails will show Dick Vader correct Historically early streamlined race cars fully tapered streamlined tails reduce drag did take long discover aerody namic benefits streamlining out weighed weight bulk body mold ings required designers made compro mise Taper aft body parts somewhat square off reduce weight bulk eliminating excess body moldings aero dynamic drag Kamm-tail higher fully tapered aft body design goals auto engineers fully met somewhat higher drag theoretical minimum Gliders no such compromise neces sary razor-thin trailing edge costs nothing weight bulk therefore trade-offs neces sary auto design inapplicable aircraft de sign Squared-off trailing edges should stay racetrack off runway Well have Two cogently ex pressed viewpoints supporting thin trailing edges have presented guess ball now court support squared-off trail ing edges bout guys anyone out evidence squared-off trail ing edges should used Personally have al ways supporter razor-thin trailing edges someone can show hun dreds hours have spent sanding trailing edges razor-thin has just futile attempt drag re duction floor yours Whats photos know check out photos first probably wondering heck Slope Soaring col umn loaded photos F3B ships month really two reasons first obvious although specifically designed type Sailplane performs great slope loaded up high winds big ships really move out can actually execute some pretty impressive Aer obatics might think its little crazy 160 Model Aviation h RC Slope Soaring/Triebes Continued page 157 examine outer edges envelope $600 Sailplane whats fun theres no risk involved am being bad influ ence again Maybe real fun should watch ing someone else pushing $600 plane limit second reason seems very noticeable undeniable connection tween Slope pilots F3B pilots Most best F3B fliers world also avid Slopers cant help think flying slope has helped make best am saying cant excel F3B being Sloper too think few things learn through Slope flying give advantage over dont Slope Lets face Slope fliers pretty cool charac ters like fly fast direct result conditions slope learn fly smooth ly key being successful type flying Name top pilots world first thing comes mind smoothly fly no herky-jerky wasted motions maneuvers what enables get out planes conditions So what does have average Slopehead dont know exactly guess word going get out sooner later might well fess up tell myself Im getting pretty serious about F3B stuff Although thought Id never admit Ive entered couple thermal contests past few months still feel little nauseous saying word guess theres still some hope Dont worry Sloping has al ways will first love Im excited about challenge F3B offers nothing matches fun can have slope What have noticed guess point Im trying make think ing other types flying overall skills have improved am able use some techniques styles thermaling theres word againsony guys F3B Im slope Just believe Slope flying makes better F3B pilot think F3B fly ing might just make better Slope pilot What think Am just suffering ther mals brain something Yeah noticed makes twice single par agraph Sounds terminal RC Electrics/Kopski Continued page 51 mixed-up arrangementguess what Snap Crackle Pop Smoke Anyway increasing number modelers may realize have damaged control manner return controls warranty service Suppliers course ob ligated provide warranty repairs such stances often dont want say no anger customers real dilemma see will result everyone eventually having pay What Im saying speculation can see time suppliers being trapped situations actually responsibility under warranty policies may eventually have no choice raise prod uct prices cover losses Well folks must tell too have made kind mating mistake Sermos connector use Ive done what described above smoked speed control way knew did paid repair published photo page 57 December 89 Model Aviation photo shows stack Sermos connectors cant plug wrong ones together would encourage seriously consider doing own installations Another approach use different colors Sermos connectorsthey available colors direct Sermos Thinking back speed controls Ive seen some supplied just wires places sol der wires course connectors must added Several supplied Sermos con nectors Some supplied Tamiya pairs mostly RC car speed controls Reflecting what Ive seen field especially KRC Electric Fly field nearly 300 planes placeby far popular con nector system Sermos Given level us age likely quite few mishaps Whyit could happen Think about mistake mating wrong polarities pair Sermos connectors type connec tor possible can instantly destroy MOSFETs metal-oxide semiconductor field-effect transistorsEd controland big-time bucks h damage point might suggest dustry learn just say no such unjustified warranty work alternatively might least offer such repairs compromise price set period time Im picking unlucky folks just happen plug something together wrong like myselfi rather Im trying help everyone long run everyone indus try adopts uniform approach problem no single supplier becomes bad guy ulti mately everyone should benefit Finally thought speed control man ufacturers routinely supply Sermos connec tors products what Ive reported June 1990 161 $1995 IDEO REVIEW$1995 THE CLOUD DANCERS INTERNATIONAL R/C SHOW TEAM MEET THE WORLD RENOWNED CLOUD DANCERS SEE THE EXCITING FOOTAGE OF THEIR F- 15 EAGLES GIANT SCALE WARBIRDS JUMPERS AND THE FAMOUS FLYING MACHINE MUST FOR YOUR VIDEO COLLECTION! 1 HOUR AND 30 MINUTES OF THE CLOUD DANCERS INACTION FINISHED PRODUCT !FL VING! VOL3 IN-DEPTH KIT AND PRODUCT REVIEWS BUILDING SEGMENTS AND EXCITING FLYING SCENES FEATURING SLJ-ERLUCKYFLY 2JOE PINKSTON ARF SPORT LOW WING AIRPLANE D & R AIRCRAFTS 1/5TH P47 INNOVATIVE MODELS MASTER SCALE HURRICANEPICAS NEW 15TH SCALE SPJTFJREINNOVATIVE MODELS SAAB GRIPENFORMERLY MIKES MODELS SATELLITE CITYS UFO GLUEALSO ROBINAIRES CUSTOM RETRACT SYSTEM APPROXIMATELY 1 HOUR 45 MINUTES SAVE APPROXIMATELY $3eoee WITH MANUFACTURERS DISCOUNT COUPONS INCLUDED IN VOLUME 3 AVAILABLE ONLY FROM RC VIDEO REVIEW MAGAZINE 13360 KINGSBURY DR WEST PALM BEACH FL 33414 e 407 7903435 EACH TAPE $1995 PLUS $250 SHIPPING AND HANDLING CANADIAN ADD $600 FLORIDA ORDERS ADD 6% SALES TAX VISA AND MASTERCHARGE ALSO AVAILABLE ARE VOLUMES 1 AND 2 KING ORANGE AND JETS OVER DELAND NOW AVAILABLE TED AMOUNT OF YEARLY SUBSCRIPTIONS 5 FOR SIX VOLUMES PLUS S & H SEE IT ON VIDEO FROM BOX TO