Hand-Held Catapult Glider new event AMA Competition Regulations Although has popular midwest southwest quite few years event might unfamiliar some hence article airplanes yield fun out proportion amount time devoted building use catapult can carried hip pocket instead semi-permanent pole long May1994 59 Cut adjustment tabs stabilizer trailing edge Angled cut helps tabs stay place TEA Catapult nineinch loop -inch rubber attached dowel exceeding six inches length rubber motor mandated previous rules should make much popular event throughout country Once youve flown gliders youll intrigued subtle challenges presented simpleappearing category Arriba began result Central Indiana Aeromodellers Catapult Glider event flown Wright-Patterson Air Force Base 1988 event looked like much fun started building gliders rules return Southern California though event hadnt caught out time quickly learned lot little airplanes first meets eye Arriba culmination four years experimenting refining idea Youll notice quite few differences between Arriba hand launched glider instance semisymmetrical airfoil used allow higher-speed stability sacrificing lifting ability glide added benefit unique symmetrical airfoils center lift doesnt change variations angle attack yielding better stability turbulent air dihedral angles considerably less hand launched gliders gives better directional stability under launch two different wing planforms shown plans oval straight taper straight-taper wing seems stable under circumstances However oval wing much better choppy smalldiameter thermals have no idea two wing planforms should fly differently well have learn cope 60 Model Aviation -Size AvailableSee Page 168 osoSCALE ~-oso ZZZiZIZZhIZZz kso/ OF CH0RFAT 1 % AI OTO VS ETICAL HORZ STAG AIRFOIL O 070 RAAC SAAJDEO IAJ EF0sdMSLy LLIP7iCAL WIkJG GRAIN--- Ii 5 TILT CLAY A5 RQ 8 2 FuSLAG 4LAUIJcJ-E HOOK HAO RAZOR SLITS FOR FLIGHT AOJ U FROMr view 44 Before beginning construction get piece scrap glass about twelve sixteen inches least three-eighths inch thick use building surface will helpful accurately shaping flying surfaces youll find plenty other uses shop After building models thirty years Ive acquired allergy balsa dust recommend some type face-mask-type respirator protection against dust inhalation sanding takes very little additional time build glider usually build three time gliders go together fast dont rush building process Make sure surfaces shaped properly dihedral angles final assembly alignment correct youll rewarded fine-flying fleet gliders fun competition Choose enough sheet wood number wing sets plan build should fairly straight-grained mediumweight wood Weight important Basic Arriba design has several variations performs best under certain conditions see text grain since extra weight within reason gliders results inertia launch higher climbs Cut outline wing carefully mark dihedral cuts both top bottom wing blanks sharp #2 lead pencil accurately mark 050 upsweep leading trailing edges wings use old piece 045 aluminum spacing mark around perimeter wing blank very May1994 61 CA TA PLILT LAuAJCHO GLiDeR 8Y UeAFi AAJORCWS DAIJ B JOAJ EPCEY Type FF Catapult Glider Wingspan 16 inches Construction Sheet balsa Covering/finish Butyrate dope/ tissue Sand tips outboard halves center sections yield exact butt joint angles shown drawings glue good cyanoaciylate CyA glue angle center halves wing same way join Lightly coat leading edge wing CyA set finished wing aside fuselage assembly readied stabilizer cut light quarter grained Y16 balsa Sand glass about o thickness gently #410 paper sand lifting airfoil section vertical fin quarter-grained 12 sheet merely sanded streamlined section fuselage made fairly heavy springy stralght-grained wood heart airplane almost anything can fall off gliders glued back correct BLEND different airfoils wing root tip BROWSE through dozens airfoils ON SCREENI* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both Graphically modify airfoil shapes ON SCREENI* Enter own data quickly easily or. Select hundreds airfoils available disk SAVE YOUR FIELD SNUF-LER muffler isa low cost easy Install lIghtweight sound reducing muffler no performance penalty answer AMA muffler rule suggestions saving flying fields Meets AMA muffler rule suggestions 3 10 decibels quieter stock muffler No power loss possible 300-500 RPM increase Improves engine idle s better fuel economy Easily attached 25-108 stock mufflers Heat corrosion resistant Black E coat finish No special adapters required Weighs 35 oze Fits ASP BRAT ENYA FOX HP IRVINE K & B OS MAX ROYAL YS SUPER TIGRE mufflers available hobby shop ORDER DIRECT immediate shipmest Check MO Visa MC CODSEND 25e STAMP accepted Add$2SOfor UPS $2OOfur COD andf% salestaxFOR ADDITIONAL INFO Calif residentAND JTEC CATALOG CA residents add sales tax Overseas orders US$65 Send Check WELCOME TO THE WORLD OF RC PLANE VIDEO WOULD LIKE TO HELP YOU GET INTO AND SUCCEED IN ThE HOBBY OF RC ThROUGH OUR MANY INSTRUCilOHAL VlDO TAPSll WE HAVE WHAT YOU NEED TO GET STARTED GeWni HQbby RC sure hobby 40 rein video esplains whet look first plane what expenses espectNEWII Price $1296 plus $300 shipping BuIlding Right TheFlretllme 4 hour video gives step step instnictions building wood constructed plane includes engines radios ailgoment balancing much Build SIG Kadet MK II beginning end Price $3495 plus $400 shipping Techniques WIth Fiberglass Want build plane Fiberglass Fuselage sceptical 2-hour tape will take through glass fuseinstalling formers cuffing access doors attaching Ihe canopy finish paint fiberglass spray can only-- Price $1996 plus $300 shipping Bulkitna Fpam An excellent companion tape Fiberglass 2- hours shown hot wire retract openings foam install sheeting properly glass wings easily prime paint spray cans detailed painting Price $199 S plus $300 shipping Foreign orders double shipping charges Tapes available iiI NTSC oni Mail check Money Order 10 or call toil free 1-B00-383-851 z 515-223-0897 PLANE VIDEO P0 Box 23128________________ dIve Iowa 503254325 2 alignment fuselage breaks might well throw whole thing awayits almost impossible reassemble broken fuselage its previous alignment Cut fuselage length glue catapult hook front CyA before tapering shaping Assemble fin horizontal stabilizer fuselage using cellulose cement such Testors Ambroid since may need replace components become battle-weary sure stabilizer misaligned about 50 viewed rear high side being side want finished glider turn left glide circle normal right-handed fliers although weve flown right-hand glide circle too Due its semisymmetrical airfoil wing has recessed fuselage critical stage construction since wing cutout must close 00 incidence possible no tricks imparted here.just extremely careful mount wing close 00 can assembled aircraft given two coats thinned butyrate dope sanded lightly #600 sandpaper between coats underside painted black better visibility ground top wing trimmed contrasting tissue oniy decoration its hard see little gliders once have landed unique color pattern top wing helps lot spotting once down Now fun part flight adjusting Use modeling clay set balance point about 50% wing chord forming clay around nose let some stick out front fuselage act shock absorber inevitable hard landings Hand glides havent proven too useful go right launcher first flight point nose about 100 above horizon slight right bank use about Y power glider should climb right least attempt recover glide before touching down goes straight out dives ground extreme cases flies inverted make couple thin slits trailing edge stabilizer Angle cuts trailing edge bent up correct models being under-elevated little up elevator goes long way move tabs very gently glider gets loopy power increased back off tabs kick little turn rudder needed recovery top climb model seems climb right under full power gradually picks up speed glide until underelevates dives ground try trimming little area off horizontal stabilizer gliders set up launched under full power 800 right bank about 10 nose up top speed start roll back left resulting vertical climb velocity bleeds off until roll out level cruising altitude Once desired power glide pattern achieved use touch cellulose glue hold settings tabs settings may need changed slightly flying session dont use too much glue 462 Model Aviation p pencil Sand bottom wing surface both leading trailing edge sections up mark #150 sandpaper Use dihedral marks top wing guides redraw cut lines bottom wing Sand top contour wing using glass support wood Dust glass often avoid having clot balsa dust under wood can cause dent opposing surface Smooth surfaces #400 sandpaper being careful erase dihedral-cut lines wing blanks Use single-bulb desk light examine wings high low spots accurate airfoil shape before making dihedral cuts Note center cut angled 070 give small amount washout outboard sections wing requires VGA graphics $5995
