Free Flight DURA TION Bob Meuser THE ATRIUM time Februasy issue suggested Indoor Week 1982 might have last time wed see big-time Indoor Free Right atrium Nortbwood Insti tute West Baden IN now stands well get shot during period June 12-19 1983 dont have details writing Editors note Bud Tenny has info column month RMcM Second US Indoor Championships firm period June 12-15 1983 US Indoor Champs will include Indoor event ever heard plus few probably have official AMA events plus Bostonian Formula Manhattan Pea nut Speed Unlimited Speed knows what else period June 16-19 will undoubtedly repeat previous years plus perhaps few added goodies mail-in-your-model Fourth World Peanut Grand Prix enough classes sub classes Peanut Scale models ensure getting fair shot specialty whether pre-WW Pioneer Class Post-WW II Modern Class special class Fikes Laceys First Ptac USEFChamm 82 EXTIZEMES P-30 D1N ZARATh 3 SLiCCd ri bottom onLy & bottom soLid ricsot 3-4t 0 10 RoLledL 2 j 31t - B- Dicx8oncsts top 1v 0 1We8ws Nose cts TtLse c2sxJ Stc12 Wing 95 155 30 i4o 400 Motor 4str 108 10 Peck 9j Pot Led fro-m J skt 2 4 down 47oCAi \-~5tt4Aj C Tibe rnlnf ic I-tot stuff 4055 33 32 4 3q32 W1n8 stab sjmiLr N ttced 58 Model Aviation LY~/F Continued page 162 Bob points out some Interesting facts about low-aspect-ratio P-30s column also gives some Interesting tidbits about Including making fuselage tube pylon Barnaby wainian Tiie5 psueao-seamu rubberpower canards competition classes World Champ Bud Romak L checks out Chris Bovais record-setting Penny WalKer Pennyplane inc built Bostonian West miss flies about University Idahos 150-ft-hlgh Kibble Dome flying site Chris set Senior Novice Pennyplane 1 mm small gyms Phyllis Warner photo record 11 mm 37 sec Model design David Hagan Photo Joe Dvorak Free Flight INDOOR Bud Tenny BAD NEWS REPLAY last column re lated demise Pirelli implied no rubber available buy However dealers have some supplies will carry needs Although does solve power problem held bay momentarily Nevertheless should use present supplies sparingly suppliers try find some other good rubber us use Indoor Week Second United States Indoor Championships sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS will held first four days door Week case havent heard Indoor Week will June 12-19 1983 magnificent atrium Northwood Institute West Baden IN Practice flying scheduled between 700 am noon Sunday June 12 Easy B Paper Stick events will flown noon through 600 pm atrium reserved FAI Indoor practice between 600 pm 800 pm Hand Launched Gliders will flown 800 am to noon Monday June 13 followed four two-hour rounds FAI Team Qualification trials Tuesday June 14 Manhattan Cabin Bostonian Cabin will flown between 700 am 1030 am Pennyplane Novice Pennyplane 1030 am 300 pm last two rounds FAI Qualification trials will held between 300 pm 700 pm Indoor Cabin models will flown concurrently FAI models final competition session US Indoor Champs will Wednesday June 15 800 am 100 pm During time slot Indoor Scale events will flown AMA Scale Peanut Scale using AMA rule 51-A Circular Speed Kit-plane Scale events will doubtless flown full stomachs official banquet scheduled 730 night before June 14 banquets excellent West Baden What rules AMA events flown US Champs will use AMA rules special rules other events copy rules will furnished entry blank available Italiano 1655 Re vere Dr Brookfield WI 53005 Please send business-sized SASE request en try blank entries postmarked later June 1 1982 will assessed $5 late-entry fee Rules Manhattan Bostonian Cabin events fairly standard will presented next column However Rubber Speed Kit-plan Scale events follows Unlimited Rubber Speed 1 Models must rubber-powered propellerdriven 2 Models must start unassisted ROG launch three-point sitting position 3 Model timed two complete laps around two pylons set 20 ft apart 4 Flights will disqualified model touches either pylon ground after cross ing starting line 5 The timer will stand line two pylons Timing starts model crosses line determined two pylons ends crosses line after completing two laps 6 Timepieces must able time 1/100 second 7 Shortest time two complete laps determines winner 8 There will no limit number models launches Peanut Speed rules Unlimited Rubber Speed shall apply except I The models limited Peanut Scale mod els 2 The models scores will time seconds models fly two laps 3 The lowest time will determine winner Kit-Plan Scale I Scale rubber-powered models built kits and/or published plans 2 The prop and/or rubber may changed allow better prop-power combination 3 The nose block thrust button may altered facilitate winding motor nose block must retain shape size etc original 4 The tissue color may changed pertinent marking must plane ie door lines hinge lines cowl bumps etc color trim should appropriate era aircraft being modeled No condenser paper film coverings will allowed flying surfaces must double-covered 5 Static judging competition will used pub lished plans Structure craftsmanship fidelity construction plan basis models score Photographs three-views needed required 6 The final score will total static Continued page 138 60 Model Aviation Super-simple winding stooge Peanut Scale Manhattan Cabin AMA Scale models Base clamps convenient anchor Slide popsicle stick up down close open wires hook rear motor peg loops slide wires closed wind model Overview Rich Doigs balsa-tester Clamp seen closeup left side deflection scale right Length-scale base may show up well photos Test weight can seen attached balsa stick just right deflection scale Closeup Richard Doigs balsa strength-tester brass tube vertical epoxied piece balsa horizontal metal rail weight metal T vertical leg slides tube holds piece balsa being tested quite se curely CoNTACTI Sullivan Sure Safe Start Stop putting up hard starting engines Start looking famous Sullivan Hi-Tork Starters fast sure starts can choose 2/5 1 hp 12 24 volts torques 230 in/oz engine start fast sure whether its airplanes heli copters boats cars Sullivan starter has built-in safetyfeatures such hand guard helps keep hafid slipping propeller offset safety switch behind flat plate prevents accidental starts rolling over starter rest thick rubberized plastic electrical cord provides optimum conduction long service life confident youll prefer starters anyone elses back two-year guaranty against defects workmanship Its time put Sullivan power work Get Sullivan starter newfor years safe troublefree starts See dealer teday er write cemptete catalog WARNING Modelers Fly Near Overhead Power Lines fit1UiI P R 0 D U C T S 1 Nerth Haven Street PO Box 5150 BaltImore MD 21224 735-3500 FF Duration/Meuser Continued aqe 58 Also during latter part week will held usual National Indoor Model Airplane Society NIMAS Record Trials name game set new AMA records failing get closer existing records anyone else details US Indoor Champs send large SASE Anthony Italiano 1655 Revere Dr Brookfield WI 53005 info Peanut Grant Prix NIMAS Record Trials write Dr John B Martin 3227 Darwin St Miami FL 33133 Zarates P-30 design Extremes popu lar AMA event introduced past decade has P-30 Outdoor Rubber-power event Rules call 30-in max span overall length 40 gram mm airframe weight 10 gram max rubber weight 9-in freewheeling plastic prop confronted spanlimited event model designers often opt low-aspect-ratio wide-chord configuration order maximize wing area prin ciple increases altitude gained climb decreases sinking speed glide P-30 models built way simply didnt work out several us tried low wing loading gave poor penetration turbulent air large center-of-lift shift wide-chord wing coupled short tail moment arm resulting overall length restriction made trimming difficult couple years ago Ding Zarate decided bear down P-30 event now has built writing advertisers mention read about Model Aviation half-dozen went wide-chord route pulled off successfully winning event US Free Flight Champs face fierce competition Extremes model ginners adjustments critical wing construction unorthodox Dings method making fuselage tube unique rolls up tube wet 1/16-in balsa exactly right width stuffs inside piece thin-wall 3/4-in -nominal PVC plastic pipe After dries is perfectly round can easily extracted pipe sketch doesnt show pylon construction very well ex treme end parts cut 1/s-in sheet grain vertical part between filled 1/32 sheet grain horizontal capped 1/32 X 3/16 cap strip end pieces sanded streamlined cross section topped piece 1/32 plywood Continued page 164 MARINE RESERVE - WELL COME ON INTO DUTY- BOY WIATA LOTTI-4E HANGAR AND SEE WH4T4 OF IRON CHUCK REALLY HAS Ti-uS GASP GETS TO FL-VTSQUADRON AING Jig PLAN S #AI 7/ ILL BET NOU/ &TMISA4D~ D MAKE T HOT DlGETY R/C Z rTHATONEJ r -THIS ON1E7-Y CAN YOU BELIEVE THAT 9 PILOTS WANT TO BUILD \TRIS IN 1/4 SCALE s7\ tA4KE TH 162 Model Aviation Clark CHUCK WOOD Hank about Y2 X cracked match wing dihedral serving wing-support platform word about alphanumeric indexing Real live flesh-and-gristle people should indexed according last names right So index West Coast modelers dutifully sandwiches Wil liams Brothers between Leroy Brooks Bob Buckner sincerely hope Mr Brothers pluralizes first name ever happy about Hand Launch Glider turbulators fol lowing regarding Hand-Launch Glider built Phil Hainer employing turbulators shown sketch appeared Sheet First thing noticed launched straight up close true vertical possible As airspeed dropped glider would show bunt-type transition just bit stall times Best seemed non-critical launch angle bank etc number us took turns throwing little hummer although some us occastonally got bad transition time would roll out flop glide significant altitude loss Phil theorizes flaps held flush during high-speed launch spring out provide lot tur bulation kill stall normally would occur point seems idea thats worth experimentation Phil tried get angle mylar strip nominally tangent arc airfoil section 10% back LE effect turbulators sinking speed noted nor thickness mylar dimensions strips seem bit extreme side Id have inclined use strips perhaps -in wide spanwise direction rather 1-in much narrower 10% chord perhaps hes getting trapped vortex behind turbs both increases effective camber decreases tendency airflow detach over aft part upper surface Anyhow simple try seems worth effort Building tips Well turns out two tips Tip isnt necessarily associated geo detic construction rather addresses prob lem sticking rib trailing edge Simply butt-joining two doesnt usually very good job except perhaps very tiny models far better solution notch trailing edge glue ribs notches Sketch thats lot work notches weaken trailing edge Win some lose some Triangular gussets glued corners help lot alter native shown Sketch B glue extension along inside edge TE notch ribs appropriately glue place manyfold increase contact area between rib TE turns trick Tip Two has positioning diagonal ribs usual method join two diagonals straight rib point TE certainly way go maximum torsional rigidity realized addition diagonal ribs diagonal ribs really doing job could cut away entire trailing edge notice decrease torsional stiff ness instead diagonal ribs set away straight ribs small amount un supported length trailing edge greatly decreased total rib-to-TE gluing area about tripled although torsional stiffness bound suffer bit compromisefinding optimum balance between advantages disadvantagesis name game model structural design Bob Whites rigging leading edges way decades External longerons Several FAI Power fliers competing recent Team Selection Fin als used fuselages employing spruce longerons set corners balsa sheet box see sketch certainly gets spruce out extremes will good regard strength stiffness too hard corners compared conventional balsa-sheeted structure resistant getting dinged Bugs Buzz Jim Scarborough editor Bob Meuser 4200 Gregory St Oakland CA 94619 { FULL*SIZE*PLANS — No 402 Ape$475 FF Jumbo Rubber Scale Armstrong-Whitworth research biplane No 403 Cub Floatplane$650 RO Sport Scale 049-10-size 4-channel replica Pipers favorite No 404 Focke-WuIf 190$300 CL Profile Scale power features unique engine mount No 131Gee Bee Model V 40-powered HG stondolf scale 01 00 great old-Sine racers$500 No 193ShIletto CL Stool orodel McDonald wronet 197619801902 FAI World Coarops$375 No220Ole Reliable HG 70 oerso0 0138 oldtimet REM coetrols 19-25$425 No 239Bloe Birds RC Ken Willords lorotoSort paoe 4-cs 10$375 No 262Crasheraster CL etoss-prool traieer 2 sizesIS- 30000 3540$125 No 282Gee Bee RC Orooger WilijOotS otagroticeot Model z br 40 errgee$750 No 291Cap 20 40-poweted scale HG Freoch oerobatic plooe Low wieg torldragger 2 sheets$750 No299Gee Bee Sr Sporlster HG t/oscole Hatfke tot 91 powet Prototype syao 300 2 sheets$1175 No 302Mini F-tO HG Soryolos 049 doCted too 0900 tot 200 Bolso wiogs tori lose oltootote$275 No 307Pegasos HG Wolsoos Ojoot sopor soilylooe teotores tiops sporlers T-toil 165 0 zoingopon$675 No 3101930 Fleet Biplane HG Sport Scolo tot 3540 4-cs Wiogopon 56 0 1 6 scole Two sheets$825 No 314Drake II HG Keo WiIords tipiog boot tot 3ch tspower Ply root 1000 wIth reroovoble geor$375 No 328Taylor Cob HG 000 Orolrs Schoolyord-Scole 0090 2-3 Gb Spoos 50 0 350 No 332Zephyr HG Smoll 2ch glider hood-looocs tow therotol slope sooriog$200 No343Wasp Vt FF Mke slops Nots-wiooiog Ootdoor HLG$100 No 348Onestep HG Troroer oos oery torgioleg 119109 qoolrlreo 3-oh 19-20 power$425 No 354Merlyn HG Giont 155-is spoo Soiplooo oses 3 HG choosels $700 No356Maole 105Cr Rocket HG 1/400010 50O5 925 10 5-oh flops 1200 0 eogoe$1200 No 356Pieces PP lodoor Loop B Robber-power cootest-wiooer W Voo Gorder$100 No 362Sopercat HG HoltA Pploo Hocer sport flier Aileroo elOoOtOt control Pooto wiog$250 No365Seansaster HG Wllords 40-size flying boot 4-oh Strop-On geor lord londylonel 2 shts$1100 No 266Space Shottle HG Larger inrprooed oersron Hoo gilder 3-oh$590 No 370CAP-21 HG Ooot-Scole Preoch oerobolic cr09 spoos 7t/g 0 Ocodro power 2 sheets - 400$1400 No 371Strato-Streek HG Old-Tinter aersion 01 Gorootis fooroos dl FE design power 2-oh$500 No 372NeighelOn HG Low-wiog Iri-geor sportoter power 4-oh$500 No 374Marissa PP Robber-powered sportster ro Goden Age troditiOo$300 No375Snapshop Twin HG Workhorse otililysport ship twin 35-40 4-5 oh P00w wiogs liSs 121052 shts$1100 No376Aororoa HG Sport Aerobotic Ilier 549-f 5 -power oses 2 30h$350 No 377Wingeraster GL Sport-Stonter t2A Profile foseloge sheet wings wIlops$200 No 370Mr Spook II HG Ply Sport Pylon Noo OpoOsmon Pooern sheet sport Uses 4-oh 25-40 pwr$550 No 379Monoboons CL Goorbot ship ins binge right sayer pedormer$375 No350Witch Hawk 500 PP Hot Gloss AR Gos coorpetitios ship 1 5-23 power Nots-wroning design$375 No 362Navy Flier PP Robber-power sports flier coptores Golden Age llOoOr Spons 26 0$350 No 303Catlisto 82 HG Ply sleek Nots-wineing Soilylone AMA Mod Old Unlimited closses$750 No 300Smelter kIP HG Econs fomoos design retorns oso 65-sz Pottern plane Retrocts loom wrn$550 No 386Laser 200 HG Spon Scole replrco cbompionship Aerobolic flier Uses 40 power 4-5 oh 2 shts$1075 No 366Czech Mete PP Gore low-wing sporIsler GO-2 powers spons 20 in$225 No 369US Mole HG Hoge gentle-flying bip1ooe Iroiner sport Spoos 50 Pot 60 engine 3-oh Two shts$1450 No350Ill Ooickie CL Nots-wioniog Scole Rocer HOT 10 power$325 No 391Orange Boo HG Lightweight slope soorer gentle winds hoed tow Uses 2 HG choonels$500 No 392Christopher HG Sport 00010 porochotistl Two-Oh set hides torso mooes orms steer chote$425 No 393A Kloud King HG Redoced modernized oersioo 1938 design Old-Timer 2 3ch$450 No 394Rain Crow PP High-pedormonce Ootdoor Hood Loonched Glider$176 No 395Sky Baby CL t2A Rocer lot Moose Scole Plons show Con Block Widow Spons t0/4 in. V-toil$175 No 396Lee-Richards PP Electric-powered 020 Scale ring-wing Oldie$350 No 367Bell YFM-l Airacade CL Sport Scole profile twin lot posher reed-ooloe 0490$325 No 396Gee Bee R-1 HG HoRkes lotest t4-scole spoos 75 in. weighs 15 lb flies 90 lorger Poor shts nO dec$2225 No 396Zephyr 1100 HG AMA Gloss B Soilplone lot 3-chonoel HG gear$675 No 450Midi-Slow CL Rot-Roce-slyle Slont troiner tot 20-power Protile$500 No 491Royal Lancer PP Bosic coorpetilion erodel AMA Gloss oses stondord-perlormonce tO engines$550 Circle numbers plans wish order 131193225239262282291 310314326332343348 365368370371372374375 379380382383385386388 392393394395396397398 402 403 404 _____________________________ Please print carefully Enclosed $ I___________ 3 STREET NAME CITY 299302 307 354356358362 376377378 389390391 399400401 ZIP __ __ __ _________ STATE --- _ _ __ ___ __ __ ________ Price includes first-class postage Send check money order payable Model Aviation AMA 1810 Samuel Morse Dr Reston VA 22090 164 Model Aviation
Edition: Model Aviation - 1983/04
Page Numbers: 58, 160
Free Flight DURA TION Bob Meuser THE ATRIUM time Februasy issue suggested Indoor Week 1982 might have last time wed see big-time Indoor Free Right atrium Nortbwood Insti tute West Baden IN now stands well get shot during period June 12-19 1983 dont have details writing Editors note Bud Tenny has info column month RMcM Second US Indoor Championships firm period June 12-15 1983 US Indoor Champs will include Indoor event ever heard plus few probably have official AMA events plus Bostonian Formula Manhattan Pea nut Speed Unlimited Speed knows what else period June 16-19 will undoubtedly repeat previous years plus perhaps few added goodies mail-in-your-model Fourth World Peanut Grand Prix enough classes sub classes Peanut Scale models ensure getting fair shot specialty whether pre-WW Pioneer Class Post-WW II Modern Class special class Fikes Laceys First Ptac USEFChamm 82 EXTIZEMES P-30 D1N ZARATh 3 SLiCCd ri bottom onLy & bottom soLid ricsot 3-4t 0 10 RoLledL 2 j 31t - B- Dicx8oncsts top 1v 0 1We8ws Nose cts TtLse c2sxJ Stc12 Wing 95 155 30 i4o 400 Motor 4str 108 10 Peck 9j Pot Led fro-m J skt 2 4 down 47oCAi \-~5tt4Aj C Tibe rnlnf ic I-tot stuff 4055 33 32 4 3q32 W1n8 stab sjmiLr N ttced 58 Model Aviation LY~/F Continued page 162 Bob points out some Interesting facts about low-aspect-ratio P-30s column also gives some Interesting tidbits about Including making fuselage tube pylon Barnaby wainian Tiie5 psueao-seamu rubberpower canards competition classes World Champ Bud Romak L checks out Chris Bovais record-setting Penny WalKer Pennyplane inc built Bostonian West miss flies about University Idahos 150-ft-hlgh Kibble Dome flying site Chris set Senior Novice Pennyplane 1 mm small gyms Phyllis Warner photo record 11 mm 37 sec Model design David Hagan Photo Joe Dvorak Free Flight INDOOR Bud Tenny BAD NEWS REPLAY last column re lated demise Pirelli implied no rubber available buy However dealers have some supplies will carry needs Although does solve power problem held bay momentarily Nevertheless should use present supplies sparingly suppliers try find some other good rubber us use Indoor Week Second United States Indoor Championships sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS will held first four days door Week case havent heard Indoor Week will June 12-19 1983 magnificent atrium Northwood Institute West Baden IN Practice flying scheduled between 700 am noon Sunday June 12 Easy B Paper Stick events will flown noon through 600 pm atrium reserved FAI Indoor practice between 600 pm 800 pm Hand Launched Gliders will flown 800 am to noon Monday June 13 followed four two-hour rounds FAI Team Qualification trials Tuesday June 14 Manhattan Cabin Bostonian Cabin will flown between 700 am 1030 am Pennyplane Novice Pennyplane 1030 am 300 pm last two rounds FAI Qualification trials will held between 300 pm 700 pm Indoor Cabin models will flown concurrently FAI models final competition session US Indoor Champs will Wednesday June 15 800 am 100 pm During time slot Indoor Scale events will flown AMA Scale Peanut Scale using AMA rule 51-A Circular Speed Kit-plane Scale events will doubtless flown full stomachs official banquet scheduled 730 night before June 14 banquets excellent West Baden What rules AMA events flown US Champs will use AMA rules special rules other events copy rules will furnished entry blank available Italiano 1655 Re vere Dr Brookfield WI 53005 Please send business-sized SASE request en try blank entries postmarked later June 1 1982 will assessed $5 late-entry fee Rules Manhattan Bostonian Cabin events fairly standard will presented next column However Rubber Speed Kit-plan Scale events follows Unlimited Rubber Speed 1 Models must rubber-powered propellerdriven 2 Models must start unassisted ROG launch three-point sitting position 3 Model timed two complete laps around two pylons set 20 ft apart 4 Flights will disqualified model touches either pylon ground after cross ing starting line 5 The timer will stand line two pylons Timing starts model crosses line determined two pylons ends crosses line after completing two laps 6 Timepieces must able time 1/100 second 7 Shortest time two complete laps determines winner 8 There will no limit number models launches Peanut Speed rules Unlimited Rubber Speed shall apply except I The models limited Peanut Scale mod els 2 The models scores will time seconds models fly two laps 3 The lowest time will determine winner Kit-Plan Scale I Scale rubber-powered models built kits and/or published plans 2 The prop and/or rubber may changed allow better prop-power combination 3 The nose block thrust button may altered facilitate winding motor nose block must retain shape size etc original 4 The tissue color may changed pertinent marking must plane ie door lines hinge lines cowl bumps etc color trim should appropriate era aircraft being modeled No condenser paper film coverings will allowed flying surfaces must double-covered 5 Static judging competition will used pub lished plans Structure craftsmanship fidelity construction plan basis models score Photographs three-views needed required 6 The final score will total static Continued page 138 60 Model Aviation Super-simple winding stooge Peanut Scale Manhattan Cabin AMA Scale models Base clamps convenient anchor Slide popsicle stick up down close open wires hook rear motor peg loops slide wires closed wind model Overview Rich Doigs balsa-tester Clamp seen closeup left side deflection scale right Length-scale base may show up well photos Test weight can seen attached balsa stick just right deflection scale Closeup Richard Doigs balsa strength-tester brass tube vertical epoxied piece balsa horizontal metal rail weight metal T vertical leg slides tube holds piece balsa being tested quite se curely CoNTACTI Sullivan Sure Safe Start Stop putting up hard starting engines Start looking famous Sullivan Hi-Tork Starters fast sure starts can choose 2/5 1 hp 12 24 volts torques 230 in/oz engine start fast sure whether its airplanes heli copters boats cars Sullivan starter has built-in safetyfeatures such hand guard helps keep hafid slipping propeller offset safety switch behind flat plate prevents accidental starts rolling over starter rest thick rubberized plastic electrical cord provides optimum conduction long service life confident youll prefer starters anyone elses back two-year guaranty against defects workmanship Its time put Sullivan power work Get Sullivan starter newfor years safe troublefree starts See dealer teday er write cemptete catalog WARNING Modelers Fly Near Overhead Power Lines fit1UiI P R 0 D U C T S 1 Nerth Haven Street PO Box 5150 BaltImore MD 21224 735-3500 FF Duration/Meuser Continued aqe 58 Also during latter part week will held usual National Indoor Model Airplane Society NIMAS Record Trials name game set new AMA records failing get closer existing records anyone else details US Indoor Champs send large SASE Anthony Italiano 1655 Revere Dr Brookfield WI 53005 info Peanut Grant Prix NIMAS Record Trials write Dr John B Martin 3227 Darwin St Miami FL 33133 Zarates P-30 design Extremes popu lar AMA event introduced past decade has P-30 Outdoor Rubber-power event Rules call 30-in max span overall length 40 gram mm airframe weight 10 gram max rubber weight 9-in freewheeling plastic prop confronted spanlimited event model designers often opt low-aspect-ratio wide-chord configuration order maximize wing area prin ciple increases altitude gained climb decreases sinking speed glide P-30 models built way simply didnt work out several us tried low wing loading gave poor penetration turbulent air large center-of-lift shift wide-chord wing coupled short tail moment arm resulting overall length restriction made trimming difficult couple years ago Ding Zarate decided bear down P-30 event now has built writing advertisers mention read about Model Aviation half-dozen went wide-chord route pulled off successfully winning event US Free Flight Champs face fierce competition Extremes model ginners adjustments critical wing construction unorthodox Dings method making fuselage tube unique rolls up tube wet 1/16-in balsa exactly right width stuffs inside piece thin-wall 3/4-in -nominal PVC plastic pipe After dries is perfectly round can easily extracted pipe sketch doesnt show pylon construction very well ex treme end parts cut 1/s-in sheet grain vertical part between filled 1/32 sheet grain horizontal capped 1/32 X 3/16 cap strip end pieces sanded streamlined cross section topped piece 1/32 plywood Continued page 164 MARINE RESERVE - WELL COME ON INTO DUTY- BOY WIATA LOTTI-4E HANGAR AND SEE WH4T4 OF IRON CHUCK REALLY HAS Ti-uS GASP GETS TO FL-VTSQUADRON AING Jig PLAN S #AI 7/ ILL BET NOU/ &TMISA4D~ D MAKE T HOT DlGETY R/C Z rTHATONEJ r -THIS ON1E7-Y CAN YOU BELIEVE THAT 9 PILOTS WANT TO BUILD \TRIS IN 1/4 SCALE s7\ tA4KE TH 162 Model Aviation Clark CHUCK WOOD Hank about Y2 X cracked match wing dihedral serving wing-support platform word about alphanumeric indexing Real live flesh-and-gristle people should indexed according last names right So index West Coast modelers dutifully sandwiches Wil liams Brothers between Leroy Brooks Bob Buckner sincerely hope Mr Brothers pluralizes first name ever happy about Hand Launch Glider turbulators fol lowing regarding Hand-Launch Glider built Phil Hainer employing turbulators shown sketch appeared Sheet First thing noticed launched straight up close true vertical possible As airspeed dropped glider would show bunt-type transition just bit stall times Best seemed non-critical launch angle bank etc number us took turns throwing little hummer although some us occastonally got bad transition time would roll out flop glide significant altitude loss Phil theorizes flaps held flush during high-speed launch spring out provide lot tur bulation kill stall normally would occur point seems idea thats worth experimentation Phil tried get angle mylar strip nominally tangent arc airfoil section 10% back LE effect turbulators sinking speed noted nor thickness mylar dimensions strips seem bit extreme side Id have inclined use strips perhaps -in wide spanwise direction rather 1-in much narrower 10% chord perhaps hes getting trapped vortex behind turbs both increases effective camber decreases tendency airflow detach over aft part upper surface Anyhow simple try seems worth effort Building tips Well turns out two tips Tip isnt necessarily associated geo detic construction rather addresses prob lem sticking rib trailing edge Simply butt-joining two doesnt usually very good job except perhaps very tiny models far better solution notch trailing edge glue ribs notches Sketch thats lot work notches weaken trailing edge Win some lose some Triangular gussets glued corners help lot alter native shown Sketch B glue extension along inside edge TE notch ribs appropriately glue place manyfold increase contact area between rib TE turns trick Tip Two has positioning diagonal ribs usual method join two diagonals straight rib point TE certainly way go maximum torsional rigidity realized addition diagonal ribs diagonal ribs really doing job could cut away entire trailing edge notice decrease torsional stiff ness instead diagonal ribs set away straight ribs small amount un supported length trailing edge greatly decreased total rib-to-TE gluing area about tripled although torsional stiffness bound suffer bit compromisefinding optimum balance between advantages disadvantagesis name game model structural design Bob Whites rigging leading edges way decades External longerons Several FAI Power fliers competing recent Team Selection Fin als used fuselages employing spruce longerons set corners balsa sheet box see sketch certainly gets spruce out extremes will good regard strength stiffness too hard corners compared conventional balsa-sheeted structure resistant getting dinged Bugs Buzz Jim Scarborough editor Bob Meuser 4200 Gregory St Oakland CA 94619 { FULL*SIZE*PLANS — No 402 Ape$475 FF Jumbo Rubber Scale Armstrong-Whitworth research biplane No 403 Cub Floatplane$650 RO Sport Scale 049-10-size 4-channel replica Pipers favorite No 404 Focke-WuIf 190$300 CL Profile Scale power features unique engine mount No 131Gee Bee Model V 40-powered HG stondolf scale 01 00 great old-Sine racers$500 No 193ShIletto CL Stool orodel McDonald wronet 197619801902 FAI World Coarops$375 No220Ole Reliable HG 70 oerso0 0138 oldtimet REM coetrols 19-25$425 No 239Bloe Birds RC Ken Willords lorotoSort paoe 4-cs 10$375 No 262Crasheraster CL etoss-prool traieer 2 sizesIS- 30000 3540$125 No 282Gee Bee RC Orooger WilijOotS otagroticeot Model z br 40 errgee$750 No 291Cap 20 40-poweted scale HG Freoch oerobatic plooe Low wieg torldragger 2 sheets$750 No299Gee Bee Sr Sporlster HG t/oscole Hatfke tot 91 powet Prototype syao 300 2 sheets$1175 No 302Mini F-tO HG Soryolos 049 doCted too 0900 tot 200 Bolso wiogs tori lose oltootote$275 No 307Pegasos HG Wolsoos Ojoot sopor soilylooe teotores tiops sporlers T-toil 165 0 zoingopon$675 No 3101930 Fleet Biplane HG Sport Scolo tot 3540 4-cs Wiogopon 56 0 1 6 scole Two sheets$825 No 314Drake II HG Keo WiIords tipiog boot tot 3ch tspower Ply root 1000 wIth reroovoble geor$375 No 328Taylor Cob HG 000 Orolrs Schoolyord-Scole 0090 2-3 Gb Spoos 50 0 350 No 332Zephyr HG Smoll 2ch glider hood-looocs tow therotol slope sooriog$200 No343Wasp Vt FF Mke slops Nots-wiooiog Ootdoor HLG$100 No 348Onestep HG Troroer oos oery torgioleg 119109 qoolrlreo 3-oh 19-20 power$425 No 354Merlyn HG Giont 155-is spoo Soiplooo oses 3 HG choosels $700 No356Maole 105Cr Rocket HG 1/400010 50O5 925 10 5-oh flops 1200 0 eogoe$1200 No 356Pieces PP lodoor Loop B Robber-power cootest-wiooer W Voo Gorder$100 No 362Sopercat HG HoltA Pploo Hocer sport flier Aileroo elOoOtOt control Pooto wiog$250 No365Seansaster HG Wllords 40-size flying boot 4-oh Strop-On geor lord londylonel 2 shts$1100 No 266Space Shottle HG Larger inrprooed oersron Hoo gilder 3-oh$590 No 370CAP-21 HG Ooot-Scole Preoch oerobolic cr09 spoos 7t/g 0 Ocodro power 2 sheets - 400$1400 No 371Strato-Streek HG Old-Tinter aersion 01 Gorootis fooroos dl FE design power 2-oh$500 No 372NeighelOn HG Low-wiog Iri-geor sportoter power 4-oh$500 No 374Marissa PP Robber-powered sportster ro Goden Age troditiOo$300 No375Snapshop Twin HG Workhorse otililysport ship twin 35-40 4-5 oh P00w wiogs liSs 121052 shts$1100 No376Aororoa HG Sport Aerobotic Ilier 549-f 5 -power oses 2 30h$350 No 377Wingeraster GL Sport-Stonter t2A Profile foseloge sheet wings wIlops$200 No 370Mr Spook II HG Ply Sport Pylon Noo OpoOsmon Pooern sheet sport Uses 4-oh 25-40 pwr$550 No 379Monoboons CL Goorbot ship ins binge right sayer pedormer$375 No350Witch Hawk 500 PP Hot Gloss AR Gos coorpetitios ship 1 5-23 power Nots-wroning design$375 No 362Navy Flier PP Robber-power sports flier coptores Golden Age llOoOr Spons 26 0$350 No 303Catlisto 82 HG Ply sleek Nots-wineing Soilylone AMA Mod Old Unlimited closses$750 No 300Smelter kIP HG Econs fomoos design retorns oso 65-sz Pottern plane Retrocts loom wrn$550 No 386Laser 200 HG Spon Scole replrco cbompionship Aerobolic flier Uses 40 power 4-5 oh 2 shts$1075 No 366Czech Mete PP Gore low-wing sporIsler GO-2 powers spons 20 in$225 No 369US Mole HG Hoge gentle-flying bip1ooe Iroiner sport Spoos 50 Pot 60 engine 3-oh Two shts$1450 No350Ill Ooickie CL Nots-wioniog Scole Rocer HOT 10 power$325 No 391Orange Boo HG Lightweight slope soorer gentle winds hoed tow Uses 2 HG choonels$500 No 392Christopher HG Sport 00010 porochotistl Two-Oh set hides torso mooes orms steer chote$425 No 393A Kloud King HG Redoced modernized oersioo 1938 design Old-Timer 2 3ch$450 No 394Rain Crow PP High-pedormonce Ootdoor Hood Loonched Glider$176 No 395Sky Baby CL t2A Rocer lot Moose Scole Plons show Con Block Widow Spons t0/4 in. V-toil$175 No 396Lee-Richards PP Electric-powered 020 Scale ring-wing Oldie$350 No 367Bell YFM-l Airacade CL Sport Scole profile twin lot posher reed-ooloe 0490$325 No 396Gee Bee R-1 HG HoRkes lotest t4-scole spoos 75 in. weighs 15 lb flies 90 lorger Poor shts nO dec$2225 No 396Zephyr 1100 HG AMA Gloss B Soilplone lot 3-chonoel HG gear$675 No 450Midi-Slow CL Rot-Roce-slyle Slont troiner tot 20-power Protile$500 No 491Royal Lancer PP Bosic coorpetilion erodel AMA Gloss oses stondord-perlormonce tO engines$550 Circle numbers plans wish order 131193225239262282291 310314326332343348 365368370371372374375 379380382383385386388 392393394395396397398 402 403 404 _____________________________ Please print carefully Enclosed $ I___________ 3 STREET NAME CITY 299302 307 354356358362 376377378 389390391 399400401 ZIP __ __ __ _________ STATE --- _ _ __ ___ __ __ ________ Price includes first-class postage Send check money order payable Model Aviation AMA 1810 Samuel Morse Dr Reston VA 22090 164 Model Aviation