Bill CiKge Scaja Hero designs literally fly themselves hands-off perform ance Learn relaxed thrill flying R/C lying back Build WE Plan n Pattern Sets AcEIRuLER 40 40 Wing 048 OS Engines RCFF-11 AcEJRULER 54 IRcFF-a 6 64 Wing 15 35 Engines ACEJRULER 94 iRCFF-9 5 94 Wing 78 28 EngInes Fastest Climbing FF Ever SKY BUGGY 32 32 Wings 048 12 Engines RcFF14 SKY BUGGY 42 iRcFF-12 6 42 Wings 29 68 Engines SKY BUGGY 74 iRCFF-10 5 74 Wings 78 26 Engines Amphibious Flying Best Two Worlds SEA Kfl1EN 51 Wing 049 12 Engines RCFF16 SEA AT iRcFF-13 $1895 66 Wing 15 40 Engines SEA LION iRCFF15 5 102 Wing 78 26 Engines Besd Henry Struck originsi Best Stunt Trainers Can Fly Themselves 049 12 Engines RcT3 ASTRO HOG 94 iRCT-1 54 Wing 15 40 Engines MIGHTY HOG 94 RcT-2 5 94 Wing 78 26 Engines Friendly Giant SUPER BUCCANEER U iRCFF-1 $1795 Wing 35 75 Engines Smaller Version Super-Buccaneer SUPER BUCCANEER 95 95 Wing l5to 29 Engines RcFF-4 $12950 Easy-to-Build Clip-Wing High Climber BUCCANEER STANDARD 66 Wing 36 60 Engines RCFFB Classic Beauty SNOW WHITE U RCFF7 5 95 WIng 19 40 Engines Soaring Beauty - CUSTOM CAVALIER 78 78 Wing 12 36 Engines RCFF-6 5 Two-Meter Powered Soarer Very Best SiNBAD 78 78 Wing 049 12 Engines RCG1 6695 Original AMA F/F Trainer Great Electric-Power Too SUPER BRIGADIER 44 44 Wing 03 09 Engines RCFF-3 SUPER BRIGADIER 66 iRCFF-2 95 Wing 15 40 Engines MS Effisger Pesadieg Mssiher AMA 9911 KeG ef Femer Prices Cr conipiete piens sub-eseemblies end detelied perts list Add $200 meWed tube Send Brochure Free Flight & Scale lans including Giant Scale Send $100 its refundable first order WE TECHNICAL SERVICES PO Box 76894A Atlanta GA 30329 Letters Editor letters will carefully considered general Interest used Send Mod el Aviation 1810 Samuel Morse Dr Reston VA 22000 Quetzalcoatlus Northropi quite well done article significant engineering endeavor has unfortunately overshadowed public failure Andrews AFB hope bad press doesnt influence Dr Mac Creadys backers extent work will completed thing noticed article other reports lack mention ofatheory pterodactyls capable actual flight same sense present-day birds theory holds capable gliding down height pounce prey able climb muscle power above starting perch same theory also explains rather strong bone claw structure wing leading edge climbing aids allowed bird climb heights needed descent prey standpoint theory Quetzalcoatlus Northropi well repre sented Dr MacCreadys model look forward reports MacCreadys con tinuing efforts produce version will fly independently wish him success Jim Coffin Annandale VA enjoyed reading about Quetzalcoatlus Northropi August 1986 issue Dr Paul MacCready has performed out standing engineering feat article said pterodactyl lived edge physical impossibility laws aerodynamics have re mained constant True enough However possibility physical properties atmosphere have dras tically changed Dr Joseph Dillow book Waters Above addresses question existence pterodactyl natural consequence theories Dr Dillow believes recently earth water vapor canopy increased atmos pheric pressure over twice what today true flight envelope creature would have stretched accommodate realistic upper lower boundary weather under canopy would have conducive stable atmosphere would have pro vided friendly environment flying Perhaps importantly increase partial pressure oxygen would have supercharged birds mus cles giving efficiency necessary flight Jim Hassinger Hagerstown MD Vertical Tx Antennas Some time ago thought strap-held box transmitter would good thing built tried noticed plane seemed getting weaker signal especially some distance away near ground hit gain rod-type antenna maximum right angles its length minimum parallel length Having involved antenna design years ago should have known gain off end antenna essentially zero Having finally discovered oversight now hold antenna vertically thus have no similar problems Marion E Gilliland Lehigh IA have noticed transmitters designed use strap-held trays have antennas located vertical nearly flight position Glow Start Sans Power read interest Safety Comes First colunm July issue Preston discusses fact glow plug engines can start benefit electric power being applied glow plug can occur due fact glow plug igniter can act catalyst produce ignition fuel principle used cigarette lighters during World War II areas flame allowed also used todays catalytic converters cars platinum igniter clean wire fine enough could cause socalled spontaneous ignition doesnt occur igniter contaminated wire massive small amount heat developed cannot raise temperature ignition point Just after run glow plug clean since has hot burned off contaminants plug near its end life parts wire may very small diameter circumstances proper mixture oxygen/fuel present glow plug wire may glow electrical power being applied Its sort chancy thing possibility always glow plug normally contaminated lubricant sometimes hard get hot enough battery am independent RC Sailplane en thusiast myself thank work goes publication Model Aviation month Heres fields fly Lloyd F Hlavka Palo Alto CA 6 Model Aviation