Free Flight Electronic Timer Last Seelig Multi-Function Timer has established self way control complex tim ing functions associated gas-power models used international competition auto-rudder actuation auto-stabilizer ac tuation engine cut-off dethermalizer actuation Still anything less 100% reliability means least destruction medel took 100 hours build tune perhaps shot World Championship kid block owning digital electronic wristwatch four-function calculators now selling under $10 question naturally arises Isnt some way could re place clockwork all-elec tronic thingamajig Nowadays elec tronics relatively easy using integrated circuit components ICs required job conventional packag ing add up fair amount weight remains problem some sort mechanical actuator Specially-built ICs out question unless willing order 100000 crack FAI-Power flier Dave Parsons brother John got rapping about problem back 1971 barely time 1972 US Free Flight Champs Taft John some help father Larry electronic timer ready Daves Cosmos II did what sup posed too bigi X 15 X 38 inand bit too heavy28 oz flexibility too-thin sheetmetal framework caused function skipped occasionally Improvements outlined nature after-hours development projects took time get together Now last seems Duralion reality electronic timer slightly larger heavier Hans Seeligs marvel just around corner back square Early John decided digital electronics height fashion modern electronics way particular job Instead timing accomplished simple resistor-capacitor relaxation cir cuit triggered unijunction tran sistor ifl turn fired SRC SRC momentarily connected battery across small Mattel Sizzler car motor after going through 6001 double worm gear reduction drove Tatone-timer-style disk turn released levers various functions disk does move continuously does Seelig Tatone device rather moves steps time interval between steps being determined electronics rotation output shaft has work cut out simply turn ing actuator disc however orig inal version called Par-Sec also drove series cams actuated mini-microswitches job switch stop electric motor after control function actuated reset electronic timer next function 1975 World Champs Gottfried Zach proxy flier Tony Cincottas Dragmaster built Kyosho kitmade fly-offs Ultimate Dragmaster US kit now available Bob Meuser size weight original Par-Sec two three times might regarded ultimate goal rather amazing first breadboard model built small package actuafly functioned model aircraft fact no larger heavier some early pre-production Seeligs Par-Sec II now under development will incorporate improvements basic concepts Par-Sec retained complex array cams switches will replaced printed-circuit en coder disk contact wipers motor might give way similar used HO slot cars incorporating carbon brushes although purpose Sizzler motor metal brushes seems ade quate RC relaxation circuit will retained goed 1/100 sec needs microseconds frame print ed circuit board will integrated goal maximize use standard commercially available components Developed John Parsons Par-Sec elec tronic timer FAI Power type models makes clockwork devices obsolete Plug-in modules determine time delays breedbroad model Will smaller Plc Dee Fair Classy-looking winch Bob Wilders Model Machine Works S2250 winds faster greater line capacity Has smoothly operat ing panic button instead pull pin simplify construction extent modeler skill tools re quired build FAT Power model can build own timer well Electrical power will furnished non-vented button-type nickel-cadmium rechargeable cells single charging will sufficient flights pack will easily replaced set freshly charged cells Although tiny button nickel-cads commonly quick-charged might turn out possible safely avoid small hassle changing bats 10 20 flights perhaps somewhat larger vented cells will used complete disclosure will appear Free Flight NFFS Digest near future full-length how-to article cant quite put together time 1976 NFFS Symposium Report planned 1977 Report hope can hold breath long Meanwhile youre holding breath might find well-document ed story development Seelig timer well worth reading appears 1975 NFFS Symposium Report164 king-size pages latest finest Free Flight model aviationstill available $7 book rate postage add 50 first class air mail anywhere world add $150 Order NFFS Plans Publications 5641 Diamond Hts Blvd San Francisco CA 94131 New Nats Perpetual Trophies Six em Southern California Aero Team SCAT has provided trophy win ning Junior Wakefield Nordic towline glider FAT-Power events Sky-Scrapers Brooklyn NY has pro vided corresponding set three Seniors last have long-overdue incentive participation FAT events younger set Good show ABC SCRAMBLER ers Winch days yore used buy cheapie bench grinders local iron-mongers throw grinding wheel neighbors cat replace reel made bits plywood tubing Add wire line guide handle some sort panic pin after six eight hours work barely func tional towline glider winch came FAT Model Supply winch works Tt expensive $695 present body switched except few die-hards like Bob Hatschek wouldnt caught dead store-bought anything Now Bob Wilder comes along classy looking winch sporting brushedaluminum exterior double-reduction silky smooth nylon gears name plate bearing very own personal monicker price tag gulp $2250 plus postage needs $2250 worth winch $695 worth will job Maybe same guy needs $20000 Ferrari 67 Bug would serve well considerably lower scale Pride owner ship does work nicely might give competitive edge Tt reels 16% faster FAT Model Supply reel 58 vs 50 inches per turnand line capacity 15% greater might advantage trend toward heavier monofilament lines continues Tncreasing line capacity still further would ial design mod Wilder would probably pittance asked him nicely Wilders has smoothly operating panic button pull-pin can easily lost Wilders feels has concontinued page 94 July1976 35 Balsa stripper left above manufactured sold Jim Jones slices strips up 1/8 sq can sat accuracy about 002 pleasure use Bob Meuser photos Designer Kits Peck-Polymerseach kit contains hardware four models two sizes kit contains 4 props other 7 Long-time winner Jim Clam kitted Sig 1971took five trophies 75 Nets HEY-THERE! Have paying $600 1/2 oz fast glue gotten zipped 50il will get twice much GLU-IT! Have paying $575 1/2 oz fast glue gotten burned 75i1 will get twice much GLU-IT! Have paying $895 1 oz fast glue gotten stuck $245 less will get same amount GLU-IT! GLU4T! BEST new ultra-fast glues Balsaand almost thing Its light fast colorless strong comes 1 oz un breakable bottle dis penser tip Price $650 postpaid Calif residents add 6% tax Tyro Model & Supply PO Box 11511 Palo Alto Calif 94306 94 Model Aviation Pitch continued use term Aerodynamic Center However equations finding much complex symmetri cal airfoil what use stunt would come out approximately same Center Pressure So since term Center Pressure bit self-explanatory since can used analytically symmetrical airfoils also since its calculation simpler will use Center Pressure can found following steps 1 Figure Mean Chord fig ured averaging Root Chord Tip Chord Say instance Root Chord 13 Tip Chord 9 Mean Chord would 11 Flaps included values 2 Layout planform wing on- paper try accurate dimensions 3 Draw Mean Chord 11 11 both wing panels 4 Figure Quarter Chord Points Mean Chords would 11 x Quarter Chord Points 275 leading edge Mean Chords Mark points 5 Connect Quarter Chord points straight line Center Pres sure line crosses center wing Fig 9 pitch situation has now has ex plained balancing concerned However should acquaint yourself particular dimensions ship determine certain characteristics pitchmainly characteristics turning capability particular ship will turn tighter tail-heavy noseheavy things affect ships turning radius Longi tudinal moment arms wing aspect ratio stab-devator aspect ratio area wing taper prop gyration other factors involved did describe because affect pitch balance concerned except mention moment arms did concern balance situa tion may have noticed throughout series term trim used spar ingly dispel ideas balance synonymous trim Trim what ship make balanced However complete balance situation comprised trimming Good balance better manifested good de sign construction because trimming compensation mistakes design construction end well trimmed ship makes some what happens end what counts others its end reached therefore good end will have certain lack satisfaction com pensating mistakes spoke good balance rather good trim anything understood reread think over address 2850 E 196 St Bronx NY 10461if have questions prod uctrviewprod uctre iwprod uctre vie wprod uctre view m LEPER br CLAUOE McCULLWflM SUPER SPORT Oipfld VV MIKE GRETZ Dynamic Duo Klipper Super S. Claude Mccullough designs Sig combine ready-touse flat-bottom foam wing balsa fuselage tail Klipper $1895 features handy printed fuselage sides permitting building internal structure directly wood Trike gear cabin config uration kit includes such niceties coil spring nose gear one-piece ABS molded cowling alumi num main gear aluminum motor mounts Both models take 09 15 engines room standard size radios intended 2 3 channels span 45 Super Sport top-of-fuselage wing stallation two-wheel gear Excepting gear differences has same kit features Klipper Price $1795 Sig Manufacturing Co. Monte zuma Iowa 50171 FF Duration/Meuser continued page 35 siderably inertiaflywheel effect FAI winch think simply natural consequence faster gearing Bob also does custom short-run machine shop work reasonable prices Check Bob Wilders Model Machine Works 2010 Boston Irving TX 75061 Boonis Such NFFS Supplies now carries three different sizes tapered fiberglass-phenolic tubes used tailbooms 42-in long small est tapering 53 29 diam eter weighing 33 grams popular A/2 Nordic glider designers sells $450 Middle-size boom tapers 74 44 diam weighs 55 grams Largest boom tapers 87 56 diam weighs 72 grams Both middle large size booms sell $700 Handling charge including insurance booms $150 per order regardless quantity Quantity discounts available two larger sizes both cut different parts 61-in piece facili tate shipping Full length tubes inter mediate sizes available special der Graphs available showing weight boom length have popular FAT-Power fliers should useful AMA-Gas classes RC gliders well Order NFFS Supplies Barbara Parsons 202 Linda Ave Piedmont CA 94611 Bob Mattes has introduced line fiberglass tubes just about freeflight application can imagine Fuse lagesnot boomsare available HalfA through C-Gas sizes prices $12 $18 Four sizes Wakefield motor tubes available prices $10 $1350 Nordic fuselage available $15 Add $4 shipping charge per order complete data write Mattes Sales 3042 Willow Wood Rd Saint Charles MO 63301 FAT Model Supply P0 Box 9778 Phoenix AZ 85068 sells pair booms $4 47-in piece weighing 38 grams A/2 gliders 24-in piece weigh ing 15 grams Add 50 postage 10% orders over $5 Aluminum Wakefield motor tubes complete front rear doublers motor peg available Jon Davis 303 Fontana NE Albuquerque NM 87108 $2150 postpaid Length 20 weight 35 grams Coupe dHiver motor tube know etched aluminum about 1-in OD 12-in long weighing 11 14 grams costs mere $3 plus $1 post age per order Other goodies available too write complete list Blue Ridge Models P0 Box 9188 Asheville NC 28805 Balsa Stripper Dig specs Handheld compact Adjustable widths up 1/8 automatically accommodates thickDONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CYT instantly know charge condition battery pack Three times brighter other POWER-CyT goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs /s oz Guaranteed 1 year yp 4 INDUSTRIES 611 S East Ave. Oak Park ii 60304 312 848-8955 nesses up ometer scale cali brated 010 can easily set about 002 Uses standard double-edge razor blade price $1080 including insurance postage works very well guides edge sheet important edge balsa sheet straight start waste cut mill-run sheet stock usually sufficient clean up sheet really battered edge mis-cue cutting strip necessary straighten edge using straight-edge hand-held razor blade takes little skill work thing especially extremely soft rather hard balsa usual range balsa densities used indoor out door free-flight modeling5 8 lb/cu ftit works just great has serious flaw much fun use will end up stripping balsa can possibly use price balsa nowadays could hazardous health pocket book want risk send $1080 Jim Jones 36631 Ledgestone Mount Clemens MI 48043 Dragniaster Kit Cottage industry lives RM Enterprises sounds pretty impressive RM stands Rosemary Round Man Enterprises oc cupy corner 11/2 car garage Any Round Man Tom Hutchinson real life has entered free-flight kit mar ket two versions well-known Ultimate Dragmaster helped earn Bob Isaacson spot last US World Champs team complete deluxe version selling phew $2250 cluding shipping includes both strip-wood cut-out parts plus plans partial kit selling $1250 includes machine-cut carved parts Plans sell $250 California residents add 6% tax Machine-cut parts finest quality balsa spruce plywood supplied Mike Taibis Superior Aircraft Prod ucts havent seen kit kind pedigree expect phew turn wow open box Sold direct mail RM Enterprises 10726 Arrowood Tem ple City CA 91780 Scrainher long string suc cessful Jim Clem designs A-B-C Scrambler designed 1969 piled up impressive record 1971 kitted Sig Jim won B-Gas Open event Scrambler 1971 Nats Joseph Mekina took first B-Gas Senior both 1973 1975 Nats Both ships used Fox 29X engines Early 1974 Jim won both B-Gas C-Gas Tulsa Annual FF Rally winds 20 25 mph Scramblers collected total five trophies 1975 Nats Note three-view spars overlap dihedral joints neat sim ple effective way getting neces sary strength points July1976 95 V rSTANDARD. $1195 48 V DELUXE1795 As shown 000w nhrfl 0400 ee dealer lirsL available Order direct Peanut Scale kits Andrew ivigornouse oi tngiana now soia tne US Peck-Polymers 6398 Shown upper photo Luton Minor rght Comper Swift Always popular subjects FF Duration continued FULL-SIZE PLANS No 149 Comedian$400 RC fun-fly aerobatic biplane good looker 40 60 No150 Cardinal Sinner$375 CL stunter 35 engines Detroiter type Very competitive No 151 Nesmith Cougar$300 FF rubber scale 30-in span Excellent design long flights No152 Fox$425 RC assist FF version 1940 Old-Timer 19 ignition 09 glow Hinnants F-5 ultimate maneuverability smoothness 60 Pattern job has all $450 Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 French Wench Free Flight Classes 1 /2A 049 051 fully tested design $225 Kioud King 15- 19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 Wiley Post Biplaqe Petite durable scale design either rubber tail wagger Ipulse rudderl$225 Harold Ruarks Sportsman RC cabin job pretty smooth lines 40 powered full-house $450 vought Kingfisher semi-scale fully stuntable CL model Les King 25 35 engines$450 Aeronca K 24 wingspan rubber Indoor Scale old-time lightplane Its done 90 seconds$200 Electric Couldnt done Dick Sarpolus Astro 25 RC job performs patterns$375 Bill Fuoris Quarter Midget House Balsa design modifications faster times$300 Zipper latest CL Scale Racers John Kilsdonk job must racing fans$175 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 cessna 150 Aerobat Step up Half-A CL jobs 09-powered semi-profile easy tobuild$275 Ernie violests OH Comet CL Scale 1974 Nats first-place winner classic twin$900 Niris An RC pattern job takes advantage best esisting criteria$400 Electro-Lite Hal Covers contest-type free flight vTosHytork electric motor$150 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat job turns dimeSi 50 Four Beginners Too basic RC trainer 09 15s rudder elevator motor controls$300 Cethexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 Hot Wood Twice Nats winner Rocket all-balsa Jetes-powered job$100 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too$400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer$100 HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kiladonks CL Rat Racer involves latest state-of-the-art$175 BAc Drone Astro-lO electric-powered 60 scale RC powered Glider$400 Komet CL 1/2-A profile semi-scale profile fun flying Mouse Race$200 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 15s$275 Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-off scale great old-time racers$500 Swiss WW II Fighter 45-inch CL scale-type sport model 29s 35s$650 Callisto superb Standard Class RC sailplane also took Nats first$400 Hyperion Mk v Don Chanceys classic Nordic A-2 competed US team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted sport$400 Candle Wind Half-A free flight competition type offers looks performance$300 Jaguar FAI 15 Combat English champ offers different configuration$225 Nieuport Monoplane Another Hannan cutie CO2 indoor/outdoor Brown single ortwin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40engine$450 Eagle CL holder Sr 1/2A Prone Speed records Uses Ccx 049$175 Sweapo rubber winning Coupe dHivercan also flown Unlimited.$275 Shark RC conversion JETCO Shark coupled flaps elevators45-60$525 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 Quicksilver RC 1/2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 BumbleBee Mk II Foam wing AMA fast-combat saves time cost$450 Circle numbers plans wish order 104105106 112113114115 120121122 128129130 100101102 107108109110 116117 103 111 118119 123124125126127 131132 138139140141142 145146147148 STATE 134135136 143 144 149150151152 ZIP Price includes first-class postage Send check money order payable ModelAviation AMA 815 Fifteenth St. NW. Washington DC 20005 fuss doublers Its old trick good Rubber-Power Peck Peck-Poly mers world famous its Peanut Scale kits other rubber-power hardware announces some new goodies addition its own line Peanut Scale models Peck also imports Peanuts Andrew Moorhouse England first Luton Minor Comper Swift both selling $398 new Nylon buttons-style nose bear ing has added line 3/64 prop wire new button has body diam 1/4 ahead diam 7/16 overall length 1/2 Intended Peck plastic props 6 9h-in diameter new bearingdesignated PA-6sells 60 package four earlier PA-l bearing 1/32-in propshafts sells 49 four-pack Available too Pecks Designer Kits two sizes PA-2 small rubberpower models contains two 4-in props two 3-in props plus shafts thrust wash ers PA-l Nylon bearings Price $125 PA-4A larger rubber-power mod els contains two 7-in props two 9-in props plus shafts washers PA-6 Nylon thrust bearings Price $309 sides convenience Designers Kits offer price savings 25% 30% compared price individual components Get dealer stock complete list write Peck-Polymers P0 Box 2498 La Mesa CA 92041 address 4200 Gregory St Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control Inc81 Big Arts Models83 Cleveland Model & Supply Co90 Cumberland Press85 CYT-4 Industries95 Du-Bro Products Inc93 Dynatek92 EK-logictrol91 Flyline Models92 Carl Goldberg Models16 Grish Brothers84 Hobby Hideaway91 JASCO86 Jefs Friends87 Peck-Polymers86 Polks Hobby Dept Stores82 Progress Mfg Company90 RSSystems52 SC Modeler Hobby Shop88 Sig Mfg Company1 Sterling Models Inc84 Sullivan Products Inc87 Top Flite Models Inc3 Tyro Model & Supply94 VL Products94 Westport International Inc85 Williams Brothers89 World EnginesBack Cover 96 Model Aviation No 100 No 101 No 102 No 103 No 104 No 105 No 106 No 107 No lOB No 109 No 110 No 111 No 112 No 113 No 114 No 115 No 116 No 117 No 118 No 119 No 120 No 121 No 122 No 123 No 124 No 125 No 126 No 127 No 128 No 129 No 130 No 131 No 132 No 134 No 135 No 136 No 137 No 135 No 139 No 140 No 141 No 142 No 143 No 144 No145 No 146 No 147 No 148 137 Please print carefully MA LA STREET CITY
Edition: Model Aviation - 1976/07
Page Numbers: 34, 35, 94, 95, 96
Free Flight Electronic Timer Last Seelig Multi-Function Timer has established self way control complex tim ing functions associated gas-power models used international competition auto-rudder actuation auto-stabilizer ac tuation engine cut-off dethermalizer actuation Still anything less 100% reliability means least destruction medel took 100 hours build tune perhaps shot World Championship kid block owning digital electronic wristwatch four-function calculators now selling under $10 question naturally arises Isnt some way could re place clockwork all-elec tronic thingamajig Nowadays elec tronics relatively easy using integrated circuit components ICs required job conventional packag ing add up fair amount weight remains problem some sort mechanical actuator Specially-built ICs out question unless willing order 100000 crack FAI-Power flier Dave Parsons brother John got rapping about problem back 1971 barely time 1972 US Free Flight Champs Taft John some help father Larry electronic timer ready Daves Cosmos II did what sup posed too bigi X 15 X 38 inand bit too heavy28 oz flexibility too-thin sheetmetal framework caused function skipped occasionally Improvements outlined nature after-hours development projects took time get together Now last seems Duralion reality electronic timer slightly larger heavier Hans Seeligs marvel just around corner back square Early John decided digital electronics height fashion modern electronics way particular job Instead timing accomplished simple resistor-capacitor relaxation cir cuit triggered unijunction tran sistor ifl turn fired SRC SRC momentarily connected battery across small Mattel Sizzler car motor after going through 6001 double worm gear reduction drove Tatone-timer-style disk turn released levers various functions disk does move continuously does Seelig Tatone device rather moves steps time interval between steps being determined electronics rotation output shaft has work cut out simply turn ing actuator disc however orig inal version called Par-Sec also drove series cams actuated mini-microswitches job switch stop electric motor after control function actuated reset electronic timer next function 1975 World Champs Gottfried Zach proxy flier Tony Cincottas Dragmaster built Kyosho kitmade fly-offs Ultimate Dragmaster US kit now available Bob Meuser size weight original Par-Sec two three times might regarded ultimate goal rather amazing first breadboard model built small package actuafly functioned model aircraft fact no larger heavier some early pre-production Seeligs Par-Sec II now under development will incorporate improvements basic concepts Par-Sec retained complex array cams switches will replaced printed-circuit en coder disk contact wipers motor might give way similar used HO slot cars incorporating carbon brushes although purpose Sizzler motor metal brushes seems ade quate RC relaxation circuit will retained goed 1/100 sec needs microseconds frame print ed circuit board will integrated goal maximize use standard commercially available components Developed John Parsons Par-Sec elec tronic timer FAI Power type models makes clockwork devices obsolete Plug-in modules determine time delays breedbroad model Will smaller Plc Dee Fair Classy-looking winch Bob Wilders Model Machine Works S2250 winds faster greater line capacity Has smoothly operat ing panic button instead pull pin simplify construction extent modeler skill tools re quired build FAT Power model can build own timer well Electrical power will furnished non-vented button-type nickel-cadmium rechargeable cells single charging will sufficient flights pack will easily replaced set freshly charged cells Although tiny button nickel-cads commonly quick-charged might turn out possible safely avoid small hassle changing bats 10 20 flights perhaps somewhat larger vented cells will used complete disclosure will appear Free Flight NFFS Digest near future full-length how-to article cant quite put together time 1976 NFFS Symposium Report planned 1977 Report hope can hold breath long Meanwhile youre holding breath might find well-document ed story development Seelig timer well worth reading appears 1975 NFFS Symposium Report164 king-size pages latest finest Free Flight model aviationstill available $7 book rate postage add 50 first class air mail anywhere world add $150 Order NFFS Plans Publications 5641 Diamond Hts Blvd San Francisco CA 94131 New Nats Perpetual Trophies Six em Southern California Aero Team SCAT has provided trophy win ning Junior Wakefield Nordic towline glider FAT-Power events Sky-Scrapers Brooklyn NY has pro vided corresponding set three Seniors last have long-overdue incentive participation FAT events younger set Good show ABC SCRAMBLER ers Winch days yore used buy cheapie bench grinders local iron-mongers throw grinding wheel neighbors cat replace reel made bits plywood tubing Add wire line guide handle some sort panic pin after six eight hours work barely func tional towline glider winch came FAT Model Supply winch works Tt expensive $695 present body switched except few die-hards like Bob Hatschek wouldnt caught dead store-bought anything Now Bob Wilder comes along classy looking winch sporting brushedaluminum exterior double-reduction silky smooth nylon gears name plate bearing very own personal monicker price tag gulp $2250 plus postage needs $2250 worth winch $695 worth will job Maybe same guy needs $20000 Ferrari 67 Bug would serve well considerably lower scale Pride owner ship does work nicely might give competitive edge Tt reels 16% faster FAT Model Supply reel 58 vs 50 inches per turnand line capacity 15% greater might advantage trend toward heavier monofilament lines continues Tncreasing line capacity still further would ial design mod Wilder would probably pittance asked him nicely Wilders has smoothly operating panic button pull-pin can easily lost Wilders feels has concontinued page 94 July1976 35 Balsa stripper left above manufactured sold Jim Jones slices strips up 1/8 sq can sat accuracy about 002 pleasure use Bob Meuser photos Designer Kits Peck-Polymerseach kit contains hardware four models two sizes kit contains 4 props other 7 Long-time winner Jim Clam kitted Sig 1971took five trophies 75 Nets HEY-THERE! Have paying $600 1/2 oz fast glue gotten zipped 50il will get twice much GLU-IT! Have paying $575 1/2 oz fast glue gotten burned 75i1 will get twice much GLU-IT! Have paying $895 1 oz fast glue gotten stuck $245 less will get same amount GLU-IT! GLU4T! BEST new ultra-fast glues Balsaand almost thing Its light fast colorless strong comes 1 oz un breakable bottle dis penser tip Price $650 postpaid Calif residents add 6% tax Tyro Model & Supply PO Box 11511 Palo Alto Calif 94306 94 Model Aviation Pitch continued use term Aerodynamic Center However equations finding much complex symmetri cal airfoil what use stunt would come out approximately same Center Pressure So since term Center Pressure bit self-explanatory since can used analytically symmetrical airfoils also since its calculation simpler will use Center Pressure can found following steps 1 Figure Mean Chord fig ured averaging Root Chord Tip Chord Say instance Root Chord 13 Tip Chord 9 Mean Chord would 11 Flaps included values 2 Layout planform wing on- paper try accurate dimensions 3 Draw Mean Chord 11 11 both wing panels 4 Figure Quarter Chord Points Mean Chords would 11 x Quarter Chord Points 275 leading edge Mean Chords Mark points 5 Connect Quarter Chord points straight line Center Pres sure line crosses center wing Fig 9 pitch situation has now has ex plained balancing concerned However should acquaint yourself particular dimensions ship determine certain characteristics pitchmainly characteristics turning capability particular ship will turn tighter tail-heavy noseheavy things affect ships turning radius Longi tudinal moment arms wing aspect ratio stab-devator aspect ratio area wing taper prop gyration other factors involved did describe because affect pitch balance concerned except mention moment arms did concern balance situa tion may have noticed throughout series term trim used spar ingly dispel ideas balance synonymous trim Trim what ship make balanced However complete balance situation comprised trimming Good balance better manifested good de sign construction because trimming compensation mistakes design construction end well trimmed ship makes some what happens end what counts others its end reached therefore good end will have certain lack satisfaction com pensating mistakes spoke good balance rather good trim anything understood reread think over address 2850 E 196 St Bronx NY 10461if have questions prod uctrviewprod uctre iwprod uctre vie wprod uctre view m LEPER br CLAUOE McCULLWflM SUPER SPORT Oipfld VV MIKE GRETZ Dynamic Duo Klipper Super S. Claude Mccullough designs Sig combine ready-touse flat-bottom foam wing balsa fuselage tail Klipper $1895 features handy printed fuselage sides permitting building internal structure directly wood Trike gear cabin config uration kit includes such niceties coil spring nose gear one-piece ABS molded cowling alumi num main gear aluminum motor mounts Both models take 09 15 engines room standard size radios intended 2 3 channels span 45 Super Sport top-of-fuselage wing stallation two-wheel gear Excepting gear differences has same kit features Klipper Price $1795 Sig Manufacturing Co. Monte zuma Iowa 50171 FF Duration/Meuser continued page 35 siderably inertiaflywheel effect FAI winch think simply natural consequence faster gearing Bob also does custom short-run machine shop work reasonable prices Check Bob Wilders Model Machine Works 2010 Boston Irving TX 75061 Boonis Such NFFS Supplies now carries three different sizes tapered fiberglass-phenolic tubes used tailbooms 42-in long small est tapering 53 29 diam eter weighing 33 grams popular A/2 Nordic glider designers sells $450 Middle-size boom tapers 74 44 diam weighs 55 grams Largest boom tapers 87 56 diam weighs 72 grams Both middle large size booms sell $700 Handling charge including insurance booms $150 per order regardless quantity Quantity discounts available two larger sizes both cut different parts 61-in piece facili tate shipping Full length tubes inter mediate sizes available special der Graphs available showing weight boom length have popular FAT-Power fliers should useful AMA-Gas classes RC gliders well Order NFFS Supplies Barbara Parsons 202 Linda Ave Piedmont CA 94611 Bob Mattes has introduced line fiberglass tubes just about freeflight application can imagine Fuse lagesnot boomsare available HalfA through C-Gas sizes prices $12 $18 Four sizes Wakefield motor tubes available prices $10 $1350 Nordic fuselage available $15 Add $4 shipping charge per order complete data write Mattes Sales 3042 Willow Wood Rd Saint Charles MO 63301 FAT Model Supply P0 Box 9778 Phoenix AZ 85068 sells pair booms $4 47-in piece weighing 38 grams A/2 gliders 24-in piece weigh ing 15 grams Add 50 postage 10% orders over $5 Aluminum Wakefield motor tubes complete front rear doublers motor peg available Jon Davis 303 Fontana NE Albuquerque NM 87108 $2150 postpaid Length 20 weight 35 grams Coupe dHiver motor tube know etched aluminum about 1-in OD 12-in long weighing 11 14 grams costs mere $3 plus $1 post age per order Other goodies available too write complete list Blue Ridge Models P0 Box 9188 Asheville NC 28805 Balsa Stripper Dig specs Handheld compact Adjustable widths up 1/8 automatically accommodates thickDONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CYT instantly know charge condition battery pack Three times brighter other POWER-CyT goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs /s oz Guaranteed 1 year yp 4 INDUSTRIES 611 S East Ave. Oak Park ii 60304 312 848-8955 nesses up ometer scale cali brated 010 can easily set about 002 Uses standard double-edge razor blade price $1080 including insurance postage works very well guides edge sheet important edge balsa sheet straight start waste cut mill-run sheet stock usually sufficient clean up sheet really battered edge mis-cue cutting strip necessary straighten edge using straight-edge hand-held razor blade takes little skill work thing especially extremely soft rather hard balsa usual range balsa densities used indoor out door free-flight modeling5 8 lb/cu ftit works just great has serious flaw much fun use will end up stripping balsa can possibly use price balsa nowadays could hazardous health pocket book want risk send $1080 Jim Jones 36631 Ledgestone Mount Clemens MI 48043 Dragniaster Kit Cottage industry lives RM Enterprises sounds pretty impressive RM stands Rosemary Round Man Enterprises oc cupy corner 11/2 car garage Any Round Man Tom Hutchinson real life has entered free-flight kit mar ket two versions well-known Ultimate Dragmaster helped earn Bob Isaacson spot last US World Champs team complete deluxe version selling phew $2250 cluding shipping includes both strip-wood cut-out parts plus plans partial kit selling $1250 includes machine-cut carved parts Plans sell $250 California residents add 6% tax Machine-cut parts finest quality balsa spruce plywood supplied Mike Taibis Superior Aircraft Prod ucts havent seen kit kind pedigree expect phew turn wow open box Sold direct mail RM Enterprises 10726 Arrowood Tem ple City CA 91780 Scrainher long string suc cessful Jim Clem designs A-B-C Scrambler designed 1969 piled up impressive record 1971 kitted Sig Jim won B-Gas Open event Scrambler 1971 Nats Joseph Mekina took first B-Gas Senior both 1973 1975 Nats Both ships used Fox 29X engines Early 1974 Jim won both B-Gas C-Gas Tulsa Annual FF Rally winds 20 25 mph Scramblers collected total five trophies 1975 Nats Note three-view spars overlap dihedral joints neat sim ple effective way getting neces sary strength points July1976 95 V rSTANDARD. $1195 48 V DELUXE1795 As shown 000w nhrfl 0400 ee dealer lirsL available Order direct Peanut Scale kits Andrew ivigornouse oi tngiana now soia tne US Peck-Polymers 6398 Shown upper photo Luton Minor rght Comper Swift Always popular subjects FF Duration continued FULL-SIZE PLANS No 149 Comedian$400 RC fun-fly aerobatic biplane good looker 40 60 No150 Cardinal Sinner$375 CL stunter 35 engines Detroiter type Very competitive No 151 Nesmith Cougar$300 FF rubber scale 30-in span Excellent design long flights No152 Fox$425 RC assist FF version 1940 Old-Timer 19 ignition 09 glow Hinnants F-5 ultimate maneuverability smoothness 60 Pattern job has all $450 Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 French Wench Free Flight Classes 1 /2A 049 051 fully tested design $225 Kioud King 15- 19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 Wiley Post Biplaqe Petite durable scale design either rubber tail wagger Ipulse rudderl$225 Harold Ruarks Sportsman RC cabin job pretty smooth lines 40 powered full-house $450 vought Kingfisher semi-scale fully stuntable CL model Les King 25 35 engines$450 Aeronca K 24 wingspan rubber Indoor Scale old-time lightplane Its done 90 seconds$200 Electric Couldnt done Dick Sarpolus Astro 25 RC job performs patterns$375 Bill Fuoris Quarter Midget House Balsa design modifications faster times$300 Zipper latest CL Scale Racers John Kilsdonk job must racing fans$175 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 cessna 150 Aerobat Step up Half-A CL jobs 09-powered semi-profile easy tobuild$275 Ernie violests OH Comet CL Scale 1974 Nats first-place winner classic twin$900 Niris An RC pattern job takes advantage best esisting criteria$400 Electro-Lite Hal Covers contest-type free flight vTosHytork electric motor$150 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat job turns dimeSi 50 Four Beginners Too basic RC trainer 09 15s rudder elevator motor controls$300 Cethexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 Hot Wood Twice Nats winner Rocket all-balsa Jetes-powered job$100 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too$400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer$100 HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kiladonks CL Rat Racer involves latest state-of-the-art$175 BAc Drone Astro-lO electric-powered 60 scale RC powered Glider$400 Komet CL 1/2-A profile semi-scale profile fun flying Mouse Race$200 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 15s$275 Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-off scale great old-time racers$500 Swiss WW II Fighter 45-inch CL scale-type sport model 29s 35s$650 Callisto superb Standard Class RC sailplane also took Nats first$400 Hyperion Mk v Don Chanceys classic Nordic A-2 competed US team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted sport$400 Candle Wind Half-A free flight competition type offers looks performance$300 Jaguar FAI 15 Combat English champ offers different configuration$225 Nieuport Monoplane Another Hannan cutie CO2 indoor/outdoor Brown single ortwin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40engine$450 Eagle CL holder Sr 1/2A Prone Speed records Uses Ccx 049$175 Sweapo rubber winning Coupe dHivercan also flown Unlimited.$275 Shark RC conversion JETCO Shark coupled flaps elevators45-60$525 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 Quicksilver RC 1/2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 BumbleBee Mk II Foam wing AMA fast-combat saves time cost$450 Circle numbers plans wish order 104105106 112113114115 120121122 128129130 100101102 107108109110 116117 103 111 118119 123124125126127 131132 138139140141142 145146147148 STATE 134135136 143 144 149150151152 ZIP Price includes first-class postage Send check money order payable ModelAviation AMA 815 Fifteenth St. NW. Washington DC 20005 fuss doublers Its old trick good Rubber-Power Peck Peck-Poly mers world famous its Peanut Scale kits other rubber-power hardware announces some new goodies addition its own line Peanut Scale models Peck also imports Peanuts Andrew Moorhouse England first Luton Minor Comper Swift both selling $398 new Nylon buttons-style nose bear ing has added line 3/64 prop wire new button has body diam 1/4 ahead diam 7/16 overall length 1/2 Intended Peck plastic props 6 9h-in diameter new bearingdesignated PA-6sells 60 package four earlier PA-l bearing 1/32-in propshafts sells 49 four-pack Available too Pecks Designer Kits two sizes PA-2 small rubberpower models contains two 4-in props two 3-in props plus shafts thrust wash ers PA-l Nylon bearings Price $125 PA-4A larger rubber-power mod els contains two 7-in props two 9-in props plus shafts washers PA-6 Nylon thrust bearings Price $309 sides convenience Designers Kits offer price savings 25% 30% compared price individual components Get dealer stock complete list write Peck-Polymers P0 Box 2498 La Mesa CA 92041 address 4200 Gregory St Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control Inc81 Big Arts Models83 Cleveland Model & Supply Co90 Cumberland Press85 CYT-4 Industries95 Du-Bro Products Inc93 Dynatek92 EK-logictrol91 Flyline Models92 Carl Goldberg Models16 Grish Brothers84 Hobby Hideaway91 JASCO86 Jefs Friends87 Peck-Polymers86 Polks Hobby Dept Stores82 Progress Mfg Company90 RSSystems52 SC Modeler Hobby Shop88 Sig Mfg Company1 Sterling Models Inc84 Sullivan Products Inc87 Top Flite Models Inc3 Tyro Model & Supply94 VL Products94 Westport International Inc85 Williams Brothers89 World EnginesBack Cover 96 Model Aviation No 100 No 101 No 102 No 103 No 104 No 105 No 106 No 107 No lOB No 109 No 110 No 111 No 112 No 113 No 114 No 115 No 116 No 117 No 118 No 119 No 120 No 121 No 122 No 123 No 124 No 125 No 126 No 127 No 128 No 129 No 130 No 131 No 132 No 134 No 135 No 136 No 137 No 135 No 139 No 140 No 141 No 142 No 143 No 144 No145 No 146 No 147 No 148 137 Please print carefully MA LA STREET CITY
Edition: Model Aviation - 1976/07
Page Numbers: 34, 35, 94, 95, 96
Free Flight Electronic Timer Last Seelig Multi-Function Timer has established self way control complex tim ing functions associated gas-power models used international competition auto-rudder actuation auto-stabilizer ac tuation engine cut-off dethermalizer actuation Still anything less 100% reliability means least destruction medel took 100 hours build tune perhaps shot World Championship kid block owning digital electronic wristwatch four-function calculators now selling under $10 question naturally arises Isnt some way could re place clockwork all-elec tronic thingamajig Nowadays elec tronics relatively easy using integrated circuit components ICs required job conventional packag ing add up fair amount weight remains problem some sort mechanical actuator Specially-built ICs out question unless willing order 100000 crack FAI-Power flier Dave Parsons brother John got rapping about problem back 1971 barely time 1972 US Free Flight Champs Taft John some help father Larry electronic timer ready Daves Cosmos II did what sup posed too bigi X 15 X 38 inand bit too heavy28 oz flexibility too-thin sheetmetal framework caused function skipped occasionally Improvements outlined nature after-hours development projects took time get together Now last seems Duralion reality electronic timer slightly larger heavier Hans Seeligs marvel just around corner back square Early John decided digital electronics height fashion modern electronics way particular job Instead timing accomplished simple resistor-capacitor relaxation cir cuit triggered unijunction tran sistor ifl turn fired SRC SRC momentarily connected battery across small Mattel Sizzler car motor after going through 6001 double worm gear reduction drove Tatone-timer-style disk turn released levers various functions disk does move continuously does Seelig Tatone device rather moves steps time interval between steps being determined electronics rotation output shaft has work cut out simply turn ing actuator disc however orig inal version called Par-Sec also drove series cams actuated mini-microswitches job switch stop electric motor after control function actuated reset electronic timer next function 1975 World Champs Gottfried Zach proxy flier Tony Cincottas Dragmaster built Kyosho kitmade fly-offs Ultimate Dragmaster US kit now available Bob Meuser size weight original Par-Sec two three times might regarded ultimate goal rather amazing first breadboard model built small package actuafly functioned model aircraft fact no larger heavier some early pre-production Seeligs Par-Sec II now under development will incorporate improvements basic concepts Par-Sec retained complex array cams switches will replaced printed-circuit en coder disk contact wipers motor might give way similar used HO slot cars incorporating carbon brushes although purpose Sizzler motor metal brushes seems ade quate RC relaxation circuit will retained goed 1/100 sec needs microseconds frame print ed circuit board will integrated goal maximize use standard commercially available components Developed John Parsons Par-Sec elec tronic timer FAI Power type models makes clockwork devices obsolete Plug-in modules determine time delays breedbroad model Will smaller Plc Dee Fair Classy-looking winch Bob Wilders Model Machine Works S2250 winds faster greater line capacity Has smoothly operat ing panic button instead pull pin simplify construction extent modeler skill tools re quired build FAT Power model can build own timer well Electrical power will furnished non-vented button-type nickel-cadmium rechargeable cells single charging will sufficient flights pack will easily replaced set freshly charged cells Although tiny button nickel-cads commonly quick-charged might turn out possible safely avoid small hassle changing bats 10 20 flights perhaps somewhat larger vented cells will used complete disclosure will appear Free Flight NFFS Digest near future full-length how-to article cant quite put together time 1976 NFFS Symposium Report planned 1977 Report hope can hold breath long Meanwhile youre holding breath might find well-document ed story development Seelig timer well worth reading appears 1975 NFFS Symposium Report164 king-size pages latest finest Free Flight model aviationstill available $7 book rate postage add 50 first class air mail anywhere world add $150 Order NFFS Plans Publications 5641 Diamond Hts Blvd San Francisco CA 94131 New Nats Perpetual Trophies Six em Southern California Aero Team SCAT has provided trophy win ning Junior Wakefield Nordic towline glider FAT-Power events Sky-Scrapers Brooklyn NY has pro vided corresponding set three Seniors last have long-overdue incentive participation FAT events younger set Good show ABC SCRAMBLER ers Winch days yore used buy cheapie bench grinders local iron-mongers throw grinding wheel neighbors cat replace reel made bits plywood tubing Add wire line guide handle some sort panic pin after six eight hours work barely func tional towline glider winch came FAT Model Supply winch works Tt expensive $695 present body switched except few die-hards like Bob Hatschek wouldnt caught dead store-bought anything Now Bob Wilder comes along classy looking winch sporting brushedaluminum exterior double-reduction silky smooth nylon gears name plate bearing very own personal monicker price tag gulp $2250 plus postage needs $2250 worth winch $695 worth will job Maybe same guy needs $20000 Ferrari 67 Bug would serve well considerably lower scale Pride owner ship does work nicely might give competitive edge Tt reels 16% faster FAT Model Supply reel 58 vs 50 inches per turnand line capacity 15% greater might advantage trend toward heavier monofilament lines continues Tncreasing line capacity still further would ial design mod Wilder would probably pittance asked him nicely Wilders has smoothly operating panic button pull-pin can easily lost Wilders feels has concontinued page 94 July1976 35 Balsa stripper left above manufactured sold Jim Jones slices strips up 1/8 sq can sat accuracy about 002 pleasure use Bob Meuser photos Designer Kits Peck-Polymerseach kit contains hardware four models two sizes kit contains 4 props other 7 Long-time winner Jim Clam kitted Sig 1971took five trophies 75 Nets HEY-THERE! Have paying $600 1/2 oz fast glue gotten zipped 50il will get twice much GLU-IT! Have paying $575 1/2 oz fast glue gotten burned 75i1 will get twice much GLU-IT! Have paying $895 1 oz fast glue gotten stuck $245 less will get same amount GLU-IT! GLU4T! BEST new ultra-fast glues Balsaand almost thing Its light fast colorless strong comes 1 oz un breakable bottle dis penser tip Price $650 postpaid Calif residents add 6% tax Tyro Model & Supply PO Box 11511 Palo Alto Calif 94306 94 Model Aviation Pitch continued use term Aerodynamic Center However equations finding much complex symmetri cal airfoil what use stunt would come out approximately same Center Pressure So since term Center Pressure bit self-explanatory since can used analytically symmetrical airfoils also since its calculation simpler will use Center Pressure can found following steps 1 Figure Mean Chord fig ured averaging Root Chord Tip Chord Say instance Root Chord 13 Tip Chord 9 Mean Chord would 11 Flaps included values 2 Layout planform wing on- paper try accurate dimensions 3 Draw Mean Chord 11 11 both wing panels 4 Figure Quarter Chord Points Mean Chords would 11 x Quarter Chord Points 275 leading edge Mean Chords Mark points 5 Connect Quarter Chord points straight line Center Pres sure line crosses center wing Fig 9 pitch situation has now has ex plained balancing concerned However should acquaint yourself particular dimensions ship determine certain characteristics pitchmainly characteristics turning capability particular ship will turn tighter tail-heavy noseheavy things affect ships turning radius Longi tudinal moment arms wing aspect ratio stab-devator aspect ratio area wing taper prop gyration other factors involved did describe because affect pitch balance concerned except mention moment arms did concern balance situa tion may have noticed throughout series term trim used spar ingly dispel ideas balance synonymous trim Trim what ship make balanced However complete balance situation comprised trimming Good balance better manifested good de sign construction because trimming compensation mistakes design construction end well trimmed ship makes some what happens end what counts others its end reached therefore good end will have certain lack satisfaction com pensating mistakes spoke good balance rather good trim anything understood reread think over address 2850 E 196 St Bronx NY 10461if have questions prod uctrviewprod uctre iwprod uctre vie wprod uctre view m LEPER br CLAUOE McCULLWflM SUPER SPORT Oipfld VV MIKE GRETZ Dynamic Duo Klipper Super S. Claude Mccullough designs Sig combine ready-touse flat-bottom foam wing balsa fuselage tail Klipper $1895 features handy printed fuselage sides permitting building internal structure directly wood Trike gear cabin config uration kit includes such niceties coil spring nose gear one-piece ABS molded cowling alumi num main gear aluminum motor mounts Both models take 09 15 engines room standard size radios intended 2 3 channels span 45 Super Sport top-of-fuselage wing stallation two-wheel gear Excepting gear differences has same kit features Klipper Price $1795 Sig Manufacturing Co. Monte zuma Iowa 50171 FF Duration/Meuser continued page 35 siderably inertiaflywheel effect FAI winch think simply natural consequence faster gearing Bob also does custom short-run machine shop work reasonable prices Check Bob Wilders Model Machine Works 2010 Boston Irving TX 75061 Boonis Such NFFS Supplies now carries three different sizes tapered fiberglass-phenolic tubes used tailbooms 42-in long small est tapering 53 29 diam eter weighing 33 grams popular A/2 Nordic glider designers sells $450 Middle-size boom tapers 74 44 diam weighs 55 grams Largest boom tapers 87 56 diam weighs 72 grams Both middle large size booms sell $700 Handling charge including insurance booms $150 per order regardless quantity Quantity discounts available two larger sizes both cut different parts 61-in piece facili tate shipping Full length tubes inter mediate sizes available special der Graphs available showing weight boom length have popular FAT-Power fliers should useful AMA-Gas classes RC gliders well Order NFFS Supplies Barbara Parsons 202 Linda Ave Piedmont CA 94611 Bob Mattes has introduced line fiberglass tubes just about freeflight application can imagine Fuse lagesnot boomsare available HalfA through C-Gas sizes prices $12 $18 Four sizes Wakefield motor tubes available prices $10 $1350 Nordic fuselage available $15 Add $4 shipping charge per order complete data write Mattes Sales 3042 Willow Wood Rd Saint Charles MO 63301 FAT Model Supply P0 Box 9778 Phoenix AZ 85068 sells pair booms $4 47-in piece weighing 38 grams A/2 gliders 24-in piece weigh ing 15 grams Add 50 postage 10% orders over $5 Aluminum Wakefield motor tubes complete front rear doublers motor peg available Jon Davis 303 Fontana NE Albuquerque NM 87108 $2150 postpaid Length 20 weight 35 grams Coupe dHiver motor tube know etched aluminum about 1-in OD 12-in long weighing 11 14 grams costs mere $3 plus $1 post age per order Other goodies available too write complete list Blue Ridge Models P0 Box 9188 Asheville NC 28805 Balsa Stripper Dig specs Handheld compact Adjustable widths up 1/8 automatically accommodates thickDONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CYT instantly know charge condition battery pack Three times brighter other POWER-CyT goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs /s oz Guaranteed 1 year yp 4 INDUSTRIES 611 S East Ave. Oak Park ii 60304 312 848-8955 nesses up ometer scale cali brated 010 can easily set about 002 Uses standard double-edge razor blade price $1080 including insurance postage works very well guides edge sheet important edge balsa sheet straight start waste cut mill-run sheet stock usually sufficient clean up sheet really battered edge mis-cue cutting strip necessary straighten edge using straight-edge hand-held razor blade takes little skill work thing especially extremely soft rather hard balsa usual range balsa densities used indoor out door free-flight modeling5 8 lb/cu ftit works just great has serious flaw much fun use will end up stripping balsa can possibly use price balsa nowadays could hazardous health pocket book want risk send $1080 Jim Jones 36631 Ledgestone Mount Clemens MI 48043 Dragniaster Kit Cottage industry lives RM Enterprises sounds pretty impressive RM stands Rosemary Round Man Enterprises oc cupy corner 11/2 car garage Any Round Man Tom Hutchinson real life has entered free-flight kit mar ket two versions well-known Ultimate Dragmaster helped earn Bob Isaacson spot last US World Champs team complete deluxe version selling phew $2250 cluding shipping includes both strip-wood cut-out parts plus plans partial kit selling $1250 includes machine-cut carved parts Plans sell $250 California residents add 6% tax Machine-cut parts finest quality balsa spruce plywood supplied Mike Taibis Superior Aircraft Prod ucts havent seen kit kind pedigree expect phew turn wow open box Sold direct mail RM Enterprises 10726 Arrowood Tem ple City CA 91780 Scrainher long string suc cessful Jim Clem designs A-B-C Scrambler designed 1969 piled up impressive record 1971 kitted Sig Jim won B-Gas Open event Scrambler 1971 Nats Joseph Mekina took first B-Gas Senior both 1973 1975 Nats Both ships used Fox 29X engines Early 1974 Jim won both B-Gas C-Gas Tulsa Annual FF Rally winds 20 25 mph Scramblers collected total five trophies 1975 Nats Note three-view spars overlap dihedral joints neat sim ple effective way getting neces sary strength points July1976 95 V rSTANDARD. $1195 48 V DELUXE1795 As shown 000w nhrfl 0400 ee dealer lirsL available Order direct Peanut Scale kits Andrew ivigornouse oi tngiana now soia tne US Peck-Polymers 6398 Shown upper photo Luton Minor rght Comper Swift Always popular subjects FF Duration continued FULL-SIZE PLANS No 149 Comedian$400 RC fun-fly aerobatic biplane good looker 40 60 No150 Cardinal Sinner$375 CL stunter 35 engines Detroiter type Very competitive No 151 Nesmith Cougar$300 FF rubber scale 30-in span Excellent design long flights No152 Fox$425 RC assist FF version 1940 Old-Timer 19 ignition 09 glow Hinnants F-5 ultimate maneuverability smoothness 60 Pattern job has all $450 Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 French Wench Free Flight Classes 1 /2A 049 051 fully tested design $225 Kioud King 15- 19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 Wiley Post Biplaqe Petite durable scale design either rubber tail wagger Ipulse rudderl$225 Harold Ruarks Sportsman RC cabin job pretty smooth lines 40 powered full-house $450 vought Kingfisher semi-scale fully stuntable CL model Les King 25 35 engines$450 Aeronca K 24 wingspan rubber Indoor Scale old-time lightplane Its done 90 seconds$200 Electric Couldnt done Dick Sarpolus Astro 25 RC job performs patterns$375 Bill Fuoris Quarter Midget House Balsa design modifications faster times$300 Zipper latest CL Scale Racers John Kilsdonk job must racing fans$175 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 cessna 150 Aerobat Step up Half-A CL jobs 09-powered semi-profile easy tobuild$275 Ernie violests OH Comet CL Scale 1974 Nats first-place winner classic twin$900 Niris An RC pattern job takes advantage best esisting criteria$400 Electro-Lite Hal Covers contest-type free flight vTosHytork electric motor$150 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat job turns dimeSi 50 Four Beginners Too basic RC trainer 09 15s rudder elevator motor controls$300 Cethexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 Hot Wood Twice Nats winner Rocket all-balsa Jetes-powered job$100 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too$400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer$100 HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kiladonks CL Rat Racer involves latest state-of-the-art$175 BAc Drone Astro-lO electric-powered 60 scale RC powered Glider$400 Komet CL 1/2-A profile semi-scale profile fun flying Mouse Race$200 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 15s$275 Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-off scale great old-time racers$500 Swiss WW II Fighter 45-inch CL scale-type sport model 29s 35s$650 Callisto superb Standard Class RC sailplane also took Nats first$400 Hyperion Mk v Don Chanceys classic Nordic A-2 competed US team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted sport$400 Candle Wind Half-A free flight competition type offers looks performance$300 Jaguar FAI 15 Combat English champ offers different configuration$225 Nieuport Monoplane Another Hannan cutie CO2 indoor/outdoor Brown single ortwin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40engine$450 Eagle CL holder Sr 1/2A Prone Speed records Uses Ccx 049$175 Sweapo rubber winning Coupe dHivercan also flown Unlimited.$275 Shark RC conversion JETCO Shark coupled flaps elevators45-60$525 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 Quicksilver RC 1/2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 BumbleBee Mk II Foam wing AMA fast-combat saves time cost$450 Circle numbers plans wish order 104105106 112113114115 120121122 128129130 100101102 107108109110 116117 103 111 118119 123124125126127 131132 138139140141142 145146147148 STATE 134135136 143 144 149150151152 ZIP Price includes first-class postage Send check money order payable ModelAviation AMA 815 Fifteenth St. NW. Washington DC 20005 fuss doublers Its old trick good Rubber-Power Peck Peck-Poly mers world famous its Peanut Scale kits other rubber-power hardware announces some new goodies addition its own line Peanut Scale models Peck also imports Peanuts Andrew Moorhouse England first Luton Minor Comper Swift both selling $398 new Nylon buttons-style nose bear ing has added line 3/64 prop wire new button has body diam 1/4 ahead diam 7/16 overall length 1/2 Intended Peck plastic props 6 9h-in diameter new bearingdesignated PA-6sells 60 package four earlier PA-l bearing 1/32-in propshafts sells 49 four-pack Available too Pecks Designer Kits two sizes PA-2 small rubberpower models contains two 4-in props two 3-in props plus shafts thrust wash ers PA-l Nylon bearings Price $125 PA-4A larger rubber-power mod els contains two 7-in props two 9-in props plus shafts washers PA-6 Nylon thrust bearings Price $309 sides convenience Designers Kits offer price savings 25% 30% compared price individual components Get dealer stock complete list write Peck-Polymers P0 Box 2498 La Mesa CA 92041 address 4200 Gregory St Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control Inc81 Big Arts Models83 Cleveland Model & Supply Co90 Cumberland Press85 CYT-4 Industries95 Du-Bro Products Inc93 Dynatek92 EK-logictrol91 Flyline Models92 Carl Goldberg Models16 Grish Brothers84 Hobby Hideaway91 JASCO86 Jefs Friends87 Peck-Polymers86 Polks Hobby Dept Stores82 Progress Mfg Company90 RSSystems52 SC Modeler Hobby Shop88 Sig Mfg Company1 Sterling Models Inc84 Sullivan Products Inc87 Top Flite Models Inc3 Tyro Model & Supply94 VL Products94 Westport International Inc85 Williams Brothers89 World EnginesBack Cover 96 Model Aviation No 100 No 101 No 102 No 103 No 104 No 105 No 106 No 107 No lOB No 109 No 110 No 111 No 112 No 113 No 114 No 115 No 116 No 117 No 118 No 119 No 120 No 121 No 122 No 123 No 124 No 125 No 126 No 127 No 128 No 129 No 130 No 131 No 132 No 134 No 135 No 136 No 137 No 135 No 139 No 140 No 141 No 142 No 143 No 144 No145 No 146 No 147 No 148 137 Please print carefully MA LA STREET CITY
Edition: Model Aviation - 1976/07
Page Numbers: 34, 35, 94, 95, 96
Free Flight Electronic Timer Last Seelig Multi-Function Timer has established self way control complex tim ing functions associated gas-power models used international competition auto-rudder actuation auto-stabilizer ac tuation engine cut-off dethermalizer actuation Still anything less 100% reliability means least destruction medel took 100 hours build tune perhaps shot World Championship kid block owning digital electronic wristwatch four-function calculators now selling under $10 question naturally arises Isnt some way could re place clockwork all-elec tronic thingamajig Nowadays elec tronics relatively easy using integrated circuit components ICs required job conventional packag ing add up fair amount weight remains problem some sort mechanical actuator Specially-built ICs out question unless willing order 100000 crack FAI-Power flier Dave Parsons brother John got rapping about problem back 1971 barely time 1972 US Free Flight Champs Taft John some help father Larry electronic timer ready Daves Cosmos II did what sup posed too bigi X 15 X 38 inand bit too heavy28 oz flexibility too-thin sheetmetal framework caused function skipped occasionally Improvements outlined nature after-hours development projects took time get together Now last seems Duralion reality electronic timer slightly larger heavier Hans Seeligs marvel just around corner back square Early John decided digital electronics height fashion modern electronics way particular job Instead timing accomplished simple resistor-capacitor relaxation cir cuit triggered unijunction tran sistor ifl turn fired SRC SRC momentarily connected battery across small Mattel Sizzler car motor after going through 6001 double worm gear reduction drove Tatone-timer-style disk turn released levers various functions disk does move continuously does Seelig Tatone device rather moves steps time interval between steps being determined electronics rotation output shaft has work cut out simply turn ing actuator disc however orig inal version called Par-Sec also drove series cams actuated mini-microswitches job switch stop electric motor after control function actuated reset electronic timer next function 1975 World Champs Gottfried Zach proxy flier Tony Cincottas Dragmaster built Kyosho kitmade fly-offs Ultimate Dragmaster US kit now available Bob Meuser size weight original Par-Sec two three times might regarded ultimate goal rather amazing first breadboard model built small package actuafly functioned model aircraft fact no larger heavier some early pre-production Seeligs Par-Sec II now under development will incorporate improvements basic concepts Par-Sec retained complex array cams switches will replaced printed-circuit en coder disk contact wipers motor might give way similar used HO slot cars incorporating carbon brushes although purpose Sizzler motor metal brushes seems ade quate RC relaxation circuit will retained goed 1/100 sec needs microseconds frame print ed circuit board will integrated goal maximize use standard commercially available components Developed John Parsons Par-Sec elec tronic timer FAI Power type models makes clockwork devices obsolete Plug-in modules determine time delays breedbroad model Will smaller Plc Dee Fair Classy-looking winch Bob Wilders Model Machine Works S2250 winds faster greater line capacity Has smoothly operat ing panic button instead pull pin simplify construction extent modeler skill tools re quired build FAT Power model can build own timer well Electrical power will furnished non-vented button-type nickel-cadmium rechargeable cells single charging will sufficient flights pack will easily replaced set freshly charged cells Although tiny button nickel-cads commonly quick-charged might turn out possible safely avoid small hassle changing bats 10 20 flights perhaps somewhat larger vented cells will used complete disclosure will appear Free Flight NFFS Digest near future full-length how-to article cant quite put together time 1976 NFFS Symposium Report planned 1977 Report hope can hold breath long Meanwhile youre holding breath might find well-document ed story development Seelig timer well worth reading appears 1975 NFFS Symposium Report164 king-size pages latest finest Free Flight model aviationstill available $7 book rate postage add 50 first class air mail anywhere world add $150 Order NFFS Plans Publications 5641 Diamond Hts Blvd San Francisco CA 94131 New Nats Perpetual Trophies Six em Southern California Aero Team SCAT has provided trophy win ning Junior Wakefield Nordic towline glider FAT-Power events Sky-Scrapers Brooklyn NY has pro vided corresponding set three Seniors last have long-overdue incentive participation FAT events younger set Good show ABC SCRAMBLER ers Winch days yore used buy cheapie bench grinders local iron-mongers throw grinding wheel neighbors cat replace reel made bits plywood tubing Add wire line guide handle some sort panic pin after six eight hours work barely func tional towline glider winch came FAT Model Supply winch works Tt expensive $695 present body switched except few die-hards like Bob Hatschek wouldnt caught dead store-bought anything Now Bob Wilder comes along classy looking winch sporting brushedaluminum exterior double-reduction silky smooth nylon gears name plate bearing very own personal monicker price tag gulp $2250 plus postage needs $2250 worth winch $695 worth will job Maybe same guy needs $20000 Ferrari 67 Bug would serve well considerably lower scale Pride owner ship does work nicely might give competitive edge Tt reels 16% faster FAT Model Supply reel 58 vs 50 inches per turnand line capacity 15% greater might advantage trend toward heavier monofilament lines continues Tncreasing line capacity still further would ial design mod Wilder would probably pittance asked him nicely Wilders has smoothly operating panic button pull-pin can easily lost Wilders feels has concontinued page 94 July1976 35 Balsa stripper left above manufactured sold Jim Jones slices strips up 1/8 sq can sat accuracy about 002 pleasure use Bob Meuser photos Designer Kits Peck-Polymerseach kit contains hardware four models two sizes kit contains 4 props other 7 Long-time winner Jim Clam kitted Sig 1971took five trophies 75 Nets HEY-THERE! Have paying $600 1/2 oz fast glue gotten zipped 50il will get twice much GLU-IT! Have paying $575 1/2 oz fast glue gotten burned 75i1 will get twice much GLU-IT! Have paying $895 1 oz fast glue gotten stuck $245 less will get same amount GLU-IT! GLU4T! BEST new ultra-fast glues Balsaand almost thing Its light fast colorless strong comes 1 oz un breakable bottle dis penser tip Price $650 postpaid Calif residents add 6% tax Tyro Model & Supply PO Box 11511 Palo Alto Calif 94306 94 Model Aviation Pitch continued use term Aerodynamic Center However equations finding much complex symmetri cal airfoil what use stunt would come out approximately same Center Pressure So since term Center Pressure bit self-explanatory since can used analytically symmetrical airfoils also since its calculation simpler will use Center Pressure can found following steps 1 Figure Mean Chord fig ured averaging Root Chord Tip Chord Say instance Root Chord 13 Tip Chord 9 Mean Chord would 11 Flaps included values 2 Layout planform wing on- paper try accurate dimensions 3 Draw Mean Chord 11 11 both wing panels 4 Figure Quarter Chord Points Mean Chords would 11 x Quarter Chord Points 275 leading edge Mean Chords Mark points 5 Connect Quarter Chord points straight line Center Pres sure line crosses center wing Fig 9 pitch situation has now has ex plained balancing concerned However should acquaint yourself particular dimensions ship determine certain characteristics pitchmainly characteristics turning capability particular ship will turn tighter tail-heavy noseheavy things affect ships turning radius Longi tudinal moment arms wing aspect ratio stab-devator aspect ratio area wing taper prop gyration other factors involved did describe because affect pitch balance concerned except mention moment arms did concern balance situa tion may have noticed throughout series term trim used spar ingly dispel ideas balance synonymous trim Trim what ship make balanced However complete balance situation comprised trimming Good balance better manifested good de sign construction because trimming compensation mistakes design construction end well trimmed ship makes some what happens end what counts others its end reached therefore good end will have certain lack satisfaction com pensating mistakes spoke good balance rather good trim anything understood reread think over address 2850 E 196 St Bronx NY 10461if have questions prod uctrviewprod uctre iwprod uctre vie wprod uctre view m LEPER br CLAUOE McCULLWflM SUPER SPORT Oipfld VV MIKE GRETZ Dynamic Duo Klipper Super S. Claude Mccullough designs Sig combine ready-touse flat-bottom foam wing balsa fuselage tail Klipper $1895 features handy printed fuselage sides permitting building internal structure directly wood Trike gear cabin config uration kit includes such niceties coil spring nose gear one-piece ABS molded cowling alumi num main gear aluminum motor mounts Both models take 09 15 engines room standard size radios intended 2 3 channels span 45 Super Sport top-of-fuselage wing stallation two-wheel gear Excepting gear differences has same kit features Klipper Price $1795 Sig Manufacturing Co. Monte zuma Iowa 50171 FF Duration/Meuser continued page 35 siderably inertiaflywheel effect FAI winch think simply natural consequence faster gearing Bob also does custom short-run machine shop work reasonable prices Check Bob Wilders Model Machine Works 2010 Boston Irving TX 75061 Boonis Such NFFS Supplies now carries three different sizes tapered fiberglass-phenolic tubes used tailbooms 42-in long small est tapering 53 29 diam eter weighing 33 grams popular A/2 Nordic glider designers sells $450 Middle-size boom tapers 74 44 diam weighs 55 grams Largest boom tapers 87 56 diam weighs 72 grams Both middle large size booms sell $700 Handling charge including insurance booms $150 per order regardless quantity Quantity discounts available two larger sizes both cut different parts 61-in piece facili tate shipping Full length tubes inter mediate sizes available special der Graphs available showing weight boom length have popular FAT-Power fliers should useful AMA-Gas classes RC gliders well Order NFFS Supplies Barbara Parsons 202 Linda Ave Piedmont CA 94611 Bob Mattes has introduced line fiberglass tubes just about freeflight application can imagine Fuse lagesnot boomsare available HalfA through C-Gas sizes prices $12 $18 Four sizes Wakefield motor tubes available prices $10 $1350 Nordic fuselage available $15 Add $4 shipping charge per order complete data write Mattes Sales 3042 Willow Wood Rd Saint Charles MO 63301 FAT Model Supply P0 Box 9778 Phoenix AZ 85068 sells pair booms $4 47-in piece weighing 38 grams A/2 gliders 24-in piece weigh ing 15 grams Add 50 postage 10% orders over $5 Aluminum Wakefield motor tubes complete front rear doublers motor peg available Jon Davis 303 Fontana NE Albuquerque NM 87108 $2150 postpaid Length 20 weight 35 grams Coupe dHiver motor tube know etched aluminum about 1-in OD 12-in long weighing 11 14 grams costs mere $3 plus $1 post age per order Other goodies available too write complete list Blue Ridge Models P0 Box 9188 Asheville NC 28805 Balsa Stripper Dig specs Handheld compact Adjustable widths up 1/8 automatically accommodates thickDONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CYT instantly know charge condition battery pack Three times brighter other POWER-CyT goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs /s oz Guaranteed 1 year yp 4 INDUSTRIES 611 S East Ave. Oak Park ii 60304 312 848-8955 nesses up ometer scale cali brated 010 can easily set about 002 Uses standard double-edge razor blade price $1080 including insurance postage works very well guides edge sheet important edge balsa sheet straight start waste cut mill-run sheet stock usually sufficient clean up sheet really battered edge mis-cue cutting strip necessary straighten edge using straight-edge hand-held razor blade takes little skill work thing especially extremely soft rather hard balsa usual range balsa densities used indoor out door free-flight modeling5 8 lb/cu ftit works just great has serious flaw much fun use will end up stripping balsa can possibly use price balsa nowadays could hazardous health pocket book want risk send $1080 Jim Jones 36631 Ledgestone Mount Clemens MI 48043 Dragniaster Kit Cottage industry lives RM Enterprises sounds pretty impressive RM stands Rosemary Round Man Enterprises oc cupy corner 11/2 car garage Any Round Man Tom Hutchinson real life has entered free-flight kit mar ket two versions well-known Ultimate Dragmaster helped earn Bob Isaacson spot last US World Champs team complete deluxe version selling phew $2250 cluding shipping includes both strip-wood cut-out parts plus plans partial kit selling $1250 includes machine-cut carved parts Plans sell $250 California residents add 6% tax Machine-cut parts finest quality balsa spruce plywood supplied Mike Taibis Superior Aircraft Prod ucts havent seen kit kind pedigree expect phew turn wow open box Sold direct mail RM Enterprises 10726 Arrowood Tem ple City CA 91780 Scrainher long string suc cessful Jim Clem designs A-B-C Scrambler designed 1969 piled up impressive record 1971 kitted Sig Jim won B-Gas Open event Scrambler 1971 Nats Joseph Mekina took first B-Gas Senior both 1973 1975 Nats Both ships used Fox 29X engines Early 1974 Jim won both B-Gas C-Gas Tulsa Annual FF Rally winds 20 25 mph Scramblers collected total five trophies 1975 Nats Note three-view spars overlap dihedral joints neat sim ple effective way getting neces sary strength points July1976 95 V rSTANDARD. $1195 48 V DELUXE1795 As shown 000w nhrfl 0400 ee dealer lirsL available Order direct Peanut Scale kits Andrew ivigornouse oi tngiana now soia tne US Peck-Polymers 6398 Shown upper photo Luton Minor rght Comper Swift Always popular subjects FF Duration continued FULL-SIZE PLANS No 149 Comedian$400 RC fun-fly aerobatic biplane good looker 40 60 No150 Cardinal Sinner$375 CL stunter 35 engines Detroiter type Very competitive No 151 Nesmith Cougar$300 FF rubber scale 30-in span Excellent design long flights No152 Fox$425 RC assist FF version 1940 Old-Timer 19 ignition 09 glow Hinnants F-5 ultimate maneuverability smoothness 60 Pattern job has all $450 Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 French Wench Free Flight Classes 1 /2A 049 051 fully tested design $225 Kioud King 15- 19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 Wiley Post Biplaqe Petite durable scale design either rubber tail wagger Ipulse rudderl$225 Harold Ruarks Sportsman RC cabin job pretty smooth lines 40 powered full-house $450 vought Kingfisher semi-scale fully stuntable CL model Les King 25 35 engines$450 Aeronca K 24 wingspan rubber Indoor Scale old-time lightplane Its done 90 seconds$200 Electric Couldnt done Dick Sarpolus Astro 25 RC job performs patterns$375 Bill Fuoris Quarter Midget House Balsa design modifications faster times$300 Zipper latest CL Scale Racers John Kilsdonk job must racing fans$175 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 cessna 150 Aerobat Step up Half-A CL jobs 09-powered semi-profile easy tobuild$275 Ernie violests OH Comet CL Scale 1974 Nats first-place winner classic twin$900 Niris An RC pattern job takes advantage best esisting criteria$400 Electro-Lite Hal Covers contest-type free flight vTosHytork electric motor$150 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat job turns dimeSi 50 Four Beginners Too basic RC trainer 09 15s rudder elevator motor controls$300 Cethexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 Hot Wood Twice Nats winner Rocket all-balsa Jetes-powered job$100 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too$400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer$100 HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kiladonks CL Rat Racer involves latest state-of-the-art$175 BAc Drone Astro-lO electric-powered 60 scale RC powered Glider$400 Komet CL 1/2-A profile semi-scale profile fun flying Mouse Race$200 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 15s$275 Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-off scale great old-time racers$500 Swiss WW II Fighter 45-inch CL scale-type sport model 29s 35s$650 Callisto superb Standard Class RC sailplane also took Nats first$400 Hyperion Mk v Don Chanceys classic Nordic A-2 competed US team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted sport$400 Candle Wind Half-A free flight competition type offers looks performance$300 Jaguar FAI 15 Combat English champ offers different configuration$225 Nieuport Monoplane Another Hannan cutie CO2 indoor/outdoor Brown single ortwin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40engine$450 Eagle CL holder Sr 1/2A Prone Speed records Uses Ccx 049$175 Sweapo rubber winning Coupe dHivercan also flown Unlimited.$275 Shark RC conversion JETCO Shark coupled flaps elevators45-60$525 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 Quicksilver RC 1/2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 BumbleBee Mk II Foam wing AMA fast-combat saves time cost$450 Circle numbers plans wish order 104105106 112113114115 120121122 128129130 100101102 107108109110 116117 103 111 118119 123124125126127 131132 138139140141142 145146147148 STATE 134135136 143 144 149150151152 ZIP Price includes first-class postage Send check money order payable ModelAviation AMA 815 Fifteenth St. NW. Washington DC 20005 fuss doublers Its old trick good Rubber-Power Peck Peck-Poly mers world famous its Peanut Scale kits other rubber-power hardware announces some new goodies addition its own line Peanut Scale models Peck also imports Peanuts Andrew Moorhouse England first Luton Minor Comper Swift both selling $398 new Nylon buttons-style nose bear ing has added line 3/64 prop wire new button has body diam 1/4 ahead diam 7/16 overall length 1/2 Intended Peck plastic props 6 9h-in diameter new bearingdesignated PA-6sells 60 package four earlier PA-l bearing 1/32-in propshafts sells 49 four-pack Available too Pecks Designer Kits two sizes PA-2 small rubberpower models contains two 4-in props two 3-in props plus shafts thrust wash ers PA-l Nylon bearings Price $125 PA-4A larger rubber-power mod els contains two 7-in props two 9-in props plus shafts washers PA-6 Nylon thrust bearings Price $309 sides convenience Designers Kits offer price savings 25% 30% compared price individual components Get dealer stock complete list write Peck-Polymers P0 Box 2498 La Mesa CA 92041 address 4200 Gregory St Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control Inc81 Big Arts Models83 Cleveland Model & Supply Co90 Cumberland Press85 CYT-4 Industries95 Du-Bro Products Inc93 Dynatek92 EK-logictrol91 Flyline Models92 Carl Goldberg Models16 Grish Brothers84 Hobby Hideaway91 JASCO86 Jefs Friends87 Peck-Polymers86 Polks Hobby Dept Stores82 Progress Mfg Company90 RSSystems52 SC Modeler Hobby Shop88 Sig Mfg Company1 Sterling Models Inc84 Sullivan Products Inc87 Top Flite Models Inc3 Tyro Model & Supply94 VL Products94 Westport International Inc85 Williams Brothers89 World EnginesBack Cover 96 Model Aviation No 100 No 101 No 102 No 103 No 104 No 105 No 106 No 107 No lOB No 109 No 110 No 111 No 112 No 113 No 114 No 115 No 116 No 117 No 118 No 119 No 120 No 121 No 122 No 123 No 124 No 125 No 126 No 127 No 128 No 129 No 130 No 131 No 132 No 134 No 135 No 136 No 137 No 135 No 139 No 140 No 141 No 142 No 143 No 144 No145 No 146 No 147 No 148 137 Please print carefully MA LA STREET CITY
Edition: Model Aviation - 1976/07
Page Numbers: 34, 35, 94, 95, 96
Free Flight Electronic Timer Last Seelig Multi-Function Timer has established self way control complex tim ing functions associated gas-power models used international competition auto-rudder actuation auto-stabilizer ac tuation engine cut-off dethermalizer actuation Still anything less 100% reliability means least destruction medel took 100 hours build tune perhaps shot World Championship kid block owning digital electronic wristwatch four-function calculators now selling under $10 question naturally arises Isnt some way could re place clockwork all-elec tronic thingamajig Nowadays elec tronics relatively easy using integrated circuit components ICs required job conventional packag ing add up fair amount weight remains problem some sort mechanical actuator Specially-built ICs out question unless willing order 100000 crack FAI-Power flier Dave Parsons brother John got rapping about problem back 1971 barely time 1972 US Free Flight Champs Taft John some help father Larry electronic timer ready Daves Cosmos II did what sup posed too bigi X 15 X 38 inand bit too heavy28 oz flexibility too-thin sheetmetal framework caused function skipped occasionally Improvements outlined nature after-hours development projects took time get together Now last seems Duralion reality electronic timer slightly larger heavier Hans Seeligs marvel just around corner back square Early John decided digital electronics height fashion modern electronics way particular job Instead timing accomplished simple resistor-capacitor relaxation cir cuit triggered unijunction tran sistor ifl turn fired SRC SRC momentarily connected battery across small Mattel Sizzler car motor after going through 6001 double worm gear reduction drove Tatone-timer-style disk turn released levers various functions disk does move continuously does Seelig Tatone device rather moves steps time interval between steps being determined electronics rotation output shaft has work cut out simply turn ing actuator disc however orig inal version called Par-Sec also drove series cams actuated mini-microswitches job switch stop electric motor after control function actuated reset electronic timer next function 1975 World Champs Gottfried Zach proxy flier Tony Cincottas Dragmaster built Kyosho kitmade fly-offs Ultimate Dragmaster US kit now available Bob Meuser size weight original Par-Sec two three times might regarded ultimate goal rather amazing first breadboard model built small package actuafly functioned model aircraft fact no larger heavier some early pre-production Seeligs Par-Sec II now under development will incorporate improvements basic concepts Par-Sec retained complex array cams switches will replaced printed-circuit en coder disk contact wipers motor might give way similar used HO slot cars incorporating carbon brushes although purpose Sizzler motor metal brushes seems ade quate RC relaxation circuit will retained goed 1/100 sec needs microseconds frame print ed circuit board will integrated goal maximize use standard commercially available components Developed John Parsons Par-Sec elec tronic timer FAI Power type models makes clockwork devices obsolete Plug-in modules determine time delays breedbroad model Will smaller Plc Dee Fair Classy-looking winch Bob Wilders Model Machine Works S2250 winds faster greater line capacity Has smoothly operat ing panic button instead pull pin simplify construction extent modeler skill tools re quired build FAT Power model can build own timer well Electrical power will furnished non-vented button-type nickel-cadmium rechargeable cells single charging will sufficient flights pack will easily replaced set freshly charged cells Although tiny button nickel-cads commonly quick-charged might turn out possible safely avoid small hassle changing bats 10 20 flights perhaps somewhat larger vented cells will used complete disclosure will appear Free Flight NFFS Digest near future full-length how-to article cant quite put together time 1976 NFFS Symposium Report planned 1977 Report hope can hold breath long Meanwhile youre holding breath might find well-document ed story development Seelig timer well worth reading appears 1975 NFFS Symposium Report164 king-size pages latest finest Free Flight model aviationstill available $7 book rate postage add 50 first class air mail anywhere world add $150 Order NFFS Plans Publications 5641 Diamond Hts Blvd San Francisco CA 94131 New Nats Perpetual Trophies Six em Southern California Aero Team SCAT has provided trophy win ning Junior Wakefield Nordic towline glider FAT-Power events Sky-Scrapers Brooklyn NY has pro vided corresponding set three Seniors last have long-overdue incentive participation FAT events younger set Good show ABC SCRAMBLER ers Winch days yore used buy cheapie bench grinders local iron-mongers throw grinding wheel neighbors cat replace reel made bits plywood tubing Add wire line guide handle some sort panic pin after six eight hours work barely func tional towline glider winch came FAT Model Supply winch works Tt expensive $695 present body switched except few die-hards like Bob Hatschek wouldnt caught dead store-bought anything Now Bob Wilder comes along classy looking winch sporting brushedaluminum exterior double-reduction silky smooth nylon gears name plate bearing very own personal monicker price tag gulp $2250 plus postage needs $2250 worth winch $695 worth will job Maybe same guy needs $20000 Ferrari 67 Bug would serve well considerably lower scale Pride owner ship does work nicely might give competitive edge Tt reels 16% faster FAT Model Supply reel 58 vs 50 inches per turnand line capacity 15% greater might advantage trend toward heavier monofilament lines continues Tncreasing line capacity still further would ial design mod Wilder would probably pittance asked him nicely Wilders has smoothly operating panic button pull-pin can easily lost Wilders feels has concontinued page 94 July1976 35 Balsa stripper left above manufactured sold Jim Jones slices strips up 1/8 sq can sat accuracy about 002 pleasure use Bob Meuser photos Designer Kits Peck-Polymerseach kit contains hardware four models two sizes kit contains 4 props other 7 Long-time winner Jim Clam kitted Sig 1971took five trophies 75 Nets HEY-THERE! Have paying $600 1/2 oz fast glue gotten zipped 50il will get twice much GLU-IT! Have paying $575 1/2 oz fast glue gotten burned 75i1 will get twice much GLU-IT! Have paying $895 1 oz fast glue gotten stuck $245 less will get same amount GLU-IT! GLU4T! BEST new ultra-fast glues Balsaand almost thing Its light fast colorless strong comes 1 oz un breakable bottle dis penser tip Price $650 postpaid Calif residents add 6% tax Tyro Model & Supply PO Box 11511 Palo Alto Calif 94306 94 Model Aviation Pitch continued use term Aerodynamic Center However equations finding much complex symmetri cal airfoil what use stunt would come out approximately same Center Pressure So since term Center Pressure bit self-explanatory since can used analytically symmetrical airfoils also since its calculation simpler will use Center Pressure can found following steps 1 Figure Mean Chord fig ured averaging Root Chord Tip Chord Say instance Root Chord 13 Tip Chord 9 Mean Chord would 11 Flaps included values 2 Layout planform wing on- paper try accurate dimensions 3 Draw Mean Chord 11 11 both wing panels 4 Figure Quarter Chord Points Mean Chords would 11 x Quarter Chord Points 275 leading edge Mean Chords Mark points 5 Connect Quarter Chord points straight line Center Pres sure line crosses center wing Fig 9 pitch situation has now has ex plained balancing concerned However should acquaint yourself particular dimensions ship determine certain characteristics pitchmainly characteristics turning capability particular ship will turn tighter tail-heavy noseheavy things affect ships turning radius Longi tudinal moment arms wing aspect ratio stab-devator aspect ratio area wing taper prop gyration other factors involved did describe because affect pitch balance concerned except mention moment arms did concern balance situa tion may have noticed throughout series term trim used spar ingly dispel ideas balance synonymous trim Trim what ship make balanced However complete balance situation comprised trimming Good balance better manifested good de sign construction because trimming compensation mistakes design construction end well trimmed ship makes some what happens end what counts others its end reached therefore good end will have certain lack satisfaction com pensating mistakes spoke good balance rather good trim anything understood reread think over address 2850 E 196 St Bronx NY 10461if have questions prod uctrviewprod uctre iwprod uctre vie wprod uctre view m LEPER br CLAUOE McCULLWflM SUPER SPORT Oipfld VV MIKE GRETZ Dynamic Duo Klipper Super S. Claude Mccullough designs Sig combine ready-touse flat-bottom foam wing balsa fuselage tail Klipper $1895 features handy printed fuselage sides permitting building internal structure directly wood Trike gear cabin config uration kit includes such niceties coil spring nose gear one-piece ABS molded cowling alumi num main gear aluminum motor mounts Both models take 09 15 engines room standard size radios intended 2 3 channels span 45 Super Sport top-of-fuselage wing stallation two-wheel gear Excepting gear differences has same kit features Klipper Price $1795 Sig Manufacturing Co. Monte zuma Iowa 50171 FF Duration/Meuser continued page 35 siderably inertiaflywheel effect FAI winch think simply natural consequence faster gearing Bob also does custom short-run machine shop work reasonable prices Check Bob Wilders Model Machine Works 2010 Boston Irving TX 75061 Boonis Such NFFS Supplies now carries three different sizes tapered fiberglass-phenolic tubes used tailbooms 42-in long small est tapering 53 29 diam eter weighing 33 grams popular A/2 Nordic glider designers sells $450 Middle-size boom tapers 74 44 diam weighs 55 grams Largest boom tapers 87 56 diam weighs 72 grams Both middle large size booms sell $700 Handling charge including insurance booms $150 per order regardless quantity Quantity discounts available two larger sizes both cut different parts 61-in piece facili tate shipping Full length tubes inter mediate sizes available special der Graphs available showing weight boom length have popular FAT-Power fliers should useful AMA-Gas classes RC gliders well Order NFFS Supplies Barbara Parsons 202 Linda Ave Piedmont CA 94611 Bob Mattes has introduced line fiberglass tubes just about freeflight application can imagine Fuse lagesnot boomsare available HalfA through C-Gas sizes prices $12 $18 Four sizes Wakefield motor tubes available prices $10 $1350 Nordic fuselage available $15 Add $4 shipping charge per order complete data write Mattes Sales 3042 Willow Wood Rd Saint Charles MO 63301 FAT Model Supply P0 Box 9778 Phoenix AZ 85068 sells pair booms $4 47-in piece weighing 38 grams A/2 gliders 24-in piece weigh ing 15 grams Add 50 postage 10% orders over $5 Aluminum Wakefield motor tubes complete front rear doublers motor peg available Jon Davis 303 Fontana NE Albuquerque NM 87108 $2150 postpaid Length 20 weight 35 grams Coupe dHiver motor tube know etched aluminum about 1-in OD 12-in long weighing 11 14 grams costs mere $3 plus $1 post age per order Other goodies available too write complete list Blue Ridge Models P0 Box 9188 Asheville NC 28805 Balsa Stripper Dig specs Handheld compact Adjustable widths up 1/8 automatically accommodates thickDONT POWER CYTM THE ORIGINAL IN PLANE BATTERY MONITOR Now fly confidence glance POWER-CYT instantly know charge condition battery pack Three times brighter other POWER-CyT goes off batteries 10 20 minute safety margin Detects bad cells Easy installation Weighs /s oz Guaranteed 1 year yp 4 INDUSTRIES 611 S East Ave. Oak Park ii 60304 312 848-8955 nesses up ometer scale cali brated 010 can easily set about 002 Uses standard double-edge razor blade price $1080 including insurance postage works very well guides edge sheet important edge balsa sheet straight start waste cut mill-run sheet stock usually sufficient clean up sheet really battered edge mis-cue cutting strip necessary straighten edge using straight-edge hand-held razor blade takes little skill work thing especially extremely soft rather hard balsa usual range balsa densities used indoor out door free-flight modeling5 8 lb/cu ftit works just great has serious flaw much fun use will end up stripping balsa can possibly use price balsa nowadays could hazardous health pocket book want risk send $1080 Jim Jones 36631 Ledgestone Mount Clemens MI 48043 Dragniaster Kit Cottage industry lives RM Enterprises sounds pretty impressive RM stands Rosemary Round Man Enterprises oc cupy corner 11/2 car garage Any Round Man Tom Hutchinson real life has entered free-flight kit mar ket two versions well-known Ultimate Dragmaster helped earn Bob Isaacson spot last US World Champs team complete deluxe version selling phew $2250 cluding shipping includes both strip-wood cut-out parts plus plans partial kit selling $1250 includes machine-cut carved parts Plans sell $250 California residents add 6% tax Machine-cut parts finest quality balsa spruce plywood supplied Mike Taibis Superior Aircraft Prod ucts havent seen kit kind pedigree expect phew turn wow open box Sold direct mail RM Enterprises 10726 Arrowood Tem ple City CA 91780 Scrainher long string suc cessful Jim Clem designs A-B-C Scrambler designed 1969 piled up impressive record 1971 kitted Sig Jim won B-Gas Open event Scrambler 1971 Nats Joseph Mekina took first B-Gas Senior both 1973 1975 Nats Both ships used Fox 29X engines Early 1974 Jim won both B-Gas C-Gas Tulsa Annual FF Rally winds 20 25 mph Scramblers collected total five trophies 1975 Nats Note three-view spars overlap dihedral joints neat sim ple effective way getting neces sary strength points July1976 95 V rSTANDARD. $1195 48 V DELUXE1795 As shown 000w nhrfl 0400 ee dealer lirsL available Order direct Peanut Scale kits Andrew ivigornouse oi tngiana now soia tne US Peck-Polymers 6398 Shown upper photo Luton Minor rght Comper Swift Always popular subjects FF Duration continued FULL-SIZE PLANS No 149 Comedian$400 RC fun-fly aerobatic biplane good looker 40 60 No150 Cardinal Sinner$375 CL stunter 35 engines Detroiter type Very competitive No 151 Nesmith Cougar$300 FF rubber scale 30-in span Excellent design long flights No152 Fox$425 RC assist FF version 1940 Old-Timer 19 ignition 09 glow Hinnants F-5 ultimate maneuverability smoothness 60 Pattern job has all $450 Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 French Wench Free Flight Classes 1 /2A 049 051 fully tested design $225 Kioud King 15- 19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 Wiley Post Biplaqe Petite durable scale design either rubber tail wagger Ipulse rudderl$225 Harold Ruarks Sportsman RC cabin job pretty smooth lines 40 powered full-house $450 vought Kingfisher semi-scale fully stuntable CL model Les King 25 35 engines$450 Aeronca K 24 wingspan rubber Indoor Scale old-time lightplane Its done 90 seconds$200 Electric Couldnt done Dick Sarpolus Astro 25 RC job performs patterns$375 Bill Fuoris Quarter Midget House Balsa design modifications faster times$300 Zipper latest CL Scale Racers John Kilsdonk job must racing fans$175 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 cessna 150 Aerobat Step up Half-A CL jobs 09-powered semi-profile easy tobuild$275 Ernie violests OH Comet CL Scale 1974 Nats first-place winner classic twin$900 Niris An RC pattern job takes advantage best esisting criteria$400 Electro-Lite Hal Covers contest-type free flight vTosHytork electric motor$150 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat job turns dimeSi 50 Four Beginners Too basic RC trainer 09 15s rudder elevator motor controls$300 Cethexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 Hot Wood Twice Nats winner Rocket all-balsa Jetes-powered job$100 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too$400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer$100 HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kiladonks CL Rat Racer involves latest state-of-the-art$175 BAc Drone Astro-lO electric-powered 60 scale RC powered Glider$400 Komet CL 1/2-A profile semi-scale profile fun flying Mouse Race$200 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 15s$275 Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-off scale great old-time racers$500 Swiss WW II Fighter 45-inch CL scale-type sport model 29s 35s$650 Callisto superb Standard Class RC sailplane also took Nats first$400 Hyperion Mk v Don Chanceys classic Nordic A-2 competed US team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted sport$400 Candle Wind Half-A free flight competition type offers looks performance$300 Jaguar FAI 15 Combat English champ offers different configuration$225 Nieuport Monoplane Another Hannan cutie CO2 indoor/outdoor Brown single ortwin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40engine$450 Eagle CL holder Sr 1/2A Prone Speed records Uses Ccx 049$175 Sweapo rubber winning Coupe dHivercan also flown Unlimited.$275 Shark RC conversion JETCO Shark coupled flaps elevators45-60$525 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 Quicksilver RC 1/2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 BumbleBee Mk II Foam wing AMA fast-combat saves time cost$450 Circle numbers plans wish order 104105106 112113114115 120121122 128129130 100101102 107108109110 116117 103 111 118119 123124125126127 131132 138139140141142 145146147148 STATE 134135136 143 144 149150151152 ZIP Price includes first-class postage Send check money order payable ModelAviation AMA 815 Fifteenth St. NW. Washington DC 20005 fuss doublers Its old trick good Rubber-Power Peck Peck-Poly mers world famous its Peanut Scale kits other rubber-power hardware announces some new goodies addition its own line Peanut Scale models Peck also imports Peanuts Andrew Moorhouse England first Luton Minor Comper Swift both selling $398 new Nylon buttons-style nose bear ing has added line 3/64 prop wire new button has body diam 1/4 ahead diam 7/16 overall length 1/2 Intended Peck plastic props 6 9h-in diameter new bearingdesignated PA-6sells 60 package four earlier PA-l bearing 1/32-in propshafts sells 49 four-pack Available too Pecks Designer Kits two sizes PA-2 small rubberpower models contains two 4-in props two 3-in props plus shafts thrust wash ers PA-l Nylon bearings Price $125 PA-4A larger rubber-power mod els contains two 7-in props two 9-in props plus shafts washers PA-6 Nylon thrust bearings Price $309 sides convenience Designers Kits offer price savings 25% 30% compared price individual components Get dealer stock complete list write Peck-Polymers P0 Box 2498 La Mesa CA 92041 address 4200 Gregory St Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control Inc81 Big Arts Models83 Cleveland Model & Supply Co90 Cumberland Press85 CYT-4 Industries95 Du-Bro Products Inc93 Dynatek92 EK-logictrol91 Flyline Models92 Carl Goldberg Models16 Grish Brothers84 Hobby Hideaway91 JASCO86 Jefs Friends87 Peck-Polymers86 Polks Hobby Dept Stores82 Progress Mfg Company90 RSSystems52 SC Modeler Hobby Shop88 Sig Mfg Company1 Sterling Models Inc84 Sullivan Products Inc87 Top Flite Models Inc3 Tyro Model & Supply94 VL Products94 Westport International Inc85 Williams Brothers89 World EnginesBack Cover 96 Model Aviation No 100 No 101 No 102 No 103 No 104 No 105 No 106 No 107 No lOB No 109 No 110 No 111 No 112 No 113 No 114 No 115 No 116 No 117 No 118 No 119 No 120 No 121 No 122 No 123 No 124 No 125 No 126 No 127 No 128 No 129 No 130 No 131 No 132 No 134 No 135 No 136 No 137 No 135 No 139 No 140 No 141 No 142 No 143 No 144 No145 No 146 No 147 No 148 137 Please print carefully MA LA STREET CITY