Timers Bringing Em Back Alive IN THE EARLY days Free Flight science air picking widely practiced Thermal flights often credited design model need read few early advertisements telling 20-minute flights 30-second motor run convinced model Contests won strength good flight often timer contestant hot pursuit automobile course airplanes engines lost forever life expectancy model short indeed testing didnt get fly away surely would fact verified skimpy fin ishes common period realization thermals re sponsible lost models led some pioneer modelers development effective dethermalizers Some early attempts included timer-released drag chutes ingenious spool system spool sys tem called length heavy thread perhaps 50 75 feet end attached wing tip other spool spool containing excess thread secured fuselage timer-release system practice air-actuated timer dropped spool unwound length thread creating hanging weight wing tip turn caused steep spiral turn dive bringing model down spool contacted earth model suddenly relieved upsetting influence still string altitude supposed recover land undamaged Good luck Various other systems developed varying degrees success until young man named Carl Gold berg now familiar sounding name perfected pop-up stab dether malizer now universal use Carl found changing stabilizer incidence 45 degrees negative flight would induce vertical pitching action sufficient stop forward motion hold wing angle attack would cause model parachute down its own flying sur faces acceptable rate descent fact rate somewhat controllable stab angle Too much model falls out sky Too little spinning develops usually harmful side effects model So 45 degrees good starting point problem mod ern Free-Flight models designed around provisions stab pop-up virtually Old-Timers chosen design must modified provide dether malization Often interesting designs passed over prospective builders due difficulty incorporating DT pro visions design want build has stab mounted top fuselage good shape stab bottom can pop leading edge down get same effect Ships removable tail assemblies though stab may mounted between top bottom longerons can sometimes modi fied providing notch vee cut out top longerons allow upward pivot tail assembly method functional unsightly say leastcontinued page 89 July1976 37 Clarence Haught Bottom fuse location OK small ships like Berkeley Musketeer 42good hsnd launch Umit wire slips over tallskid Top longerons pivot DT described text avoids unsightly Vee notch Pivot points made telescoDina aluminum tubina Top longeron pivot dethermalizer actuated mode Mating pivots insure alignment rudder time picturea author THREE CLASSICS FROM THE WILLIAMS BROTHERS pJMz NORTHROP GAMMA delightful trio 1/72 scale plastic kits serious collector/builder finely detailed min iatures feature choice decals extra parts variations example Gamma may finished FROM YOUR DEALER OR ORDER DIRECT ADDING 15% ALSO AVAILABLE FLYING MODEL ACCESSORIES NE KITS 25t FOR COMPLETE CATALOG DEPT MA PAWNEE STREET Hawks Sky Chief Ellsworths Polar Star Boeing Turners racer United airliner Martin different squadron markings PRICES Gamma $295 Boeing $495 Martin $495 POSTAGE AND HANDLING S MACHINE GUN KITS EWS SAN MARCOS CALIFORNIA 9 check machine out new environ ment main thing keep sense humor dont too serious After fun should help length en life Next months column will report 1976 Toledo Show Included will interview Ernie Huber prob ably worlds best RC helicopter pilot sets up Jet Ranger fly aerobatics Also in-depth product re port Schltiter Super Baby col lective pitch unique helicopter flight training stand lets fly learning no possibility damage helicopter See contest address 2080 Sharon Rd Winter Park FL 32789 Safe Flying No Accident FF Old-Timers/Haught continued page 37 approach used locally pivot longerons directly above stab lead ing edge rather leading edge accomplished providing hori zontal pivot tube top tail assembly longerons mating half tube section fuselage longerons shown accompanying photos system also provides automatic alignment essen tial system rudder attached stab Providing above systems practical could resort popping up leading edge wing system has its uses experience nil have reasoned system would bring ship down nose-low attitude could bad Perhaps some readers could enlighten us modelers after working out acceptable DT arrangement coii sider further modifications after rules discourage modifications referring substitution sheet built-up structures etc actual practice dethermalizing imposes some ir regular loads structure must considered damage avoided Consider landing gear wire size mounting gusseting sufficient stand vertical descent over conventional glide landing about wing joints di hedral braces sheeting surface attachment contact points Give some thought DT actuation Are going use fuse mechanical timer either event location must accessible launch time Some ships quite large just managing thing engine running can real has sle Method launch can factor ROG rise off ground accepted thing Can trip timers and/or light fuse launch yourself fact may right- left-handed will influence decisions Strive layout will allow start engine alone move around launch position service timers etc release model put ting yourself unbalanced awk ward position Remember DT system no good unless activate flight Losing model its first test may impress some troops sure sets building schedule back ways Old-Timer Event Month Scale basic appeals OldTimer realistic appearance cabin-class models satisfaction enjoyable Old-Timer Scale listed SAM Special Event included contests neverthe less fun factor high event usually restricted power models some areas may allow rubber power well Models must aircraft built prior January 1943 Since no scale points given deviations scale dihedral stabilizer size can utilized increase flight performance Some scale models quite well Cabin Antique events emphasis flying ability come right down wouldnt bad idea straight across AMA scale spectrum Theres quite wide variety interest ing subjects already plan form may draw own no re strictions along line Just adhere basic guidelines Old-Timers estab lished SAM built-up structure stand ard materials good aeronautical prac tices Beginners Corner Half fun new event hobby reading about discussing others new new basic library invalua ble would suggest following essen tial cost under $12 Zaic Yearboolis 1935-36 1937 1938 Buy through AMA sub stantial savings Air Age Gas Models Reprinted Model Airplane News must con tains 21 designs 4 scale buildable right book full-size patterns etc well some very informative articles Old-Timer Plan Lists John Pond PO Box 3113 San Jose CA 95156 OldTimer list Old-Timer Flying Scale list Rubber Towline List 75 Let us know interests comments problems address Rt 5 Box 16 Coeur dAlene ID 83814 July1976 89 MARTIN B-lOB Bare Structure Bob Schafers Folly Ship designed Rod Doyleappeared 7937 Zak Yearbook Span six feet Bunch power
Edition: Model Aviation - 1976/07
Page Numbers: 37, 89
Timers Bringing Em Back Alive IN THE EARLY days Free Flight science air picking widely practiced Thermal flights often credited design model need read few early advertisements telling 20-minute flights 30-second motor run convinced model Contests won strength good flight often timer contestant hot pursuit automobile course airplanes engines lost forever life expectancy model short indeed testing didnt get fly away surely would fact verified skimpy fin ishes common period realization thermals re sponsible lost models led some pioneer modelers development effective dethermalizers Some early attempts included timer-released drag chutes ingenious spool system spool sys tem called length heavy thread perhaps 50 75 feet end attached wing tip other spool spool containing excess thread secured fuselage timer-release system practice air-actuated timer dropped spool unwound length thread creating hanging weight wing tip turn caused steep spiral turn dive bringing model down spool contacted earth model suddenly relieved upsetting influence still string altitude supposed recover land undamaged Good luck Various other systems developed varying degrees success until young man named Carl Gold berg now familiar sounding name perfected pop-up stab dether malizer now universal use Carl found changing stabilizer incidence 45 degrees negative flight would induce vertical pitching action sufficient stop forward motion hold wing angle attack would cause model parachute down its own flying sur faces acceptable rate descent fact rate somewhat controllable stab angle Too much model falls out sky Too little spinning develops usually harmful side effects model So 45 degrees good starting point problem mod ern Free-Flight models designed around provisions stab pop-up virtually Old-Timers chosen design must modified provide dether malization Often interesting designs passed over prospective builders due difficulty incorporating DT pro visions design want build has stab mounted top fuselage good shape stab bottom can pop leading edge down get same effect Ships removable tail assemblies though stab may mounted between top bottom longerons can sometimes modi fied providing notch vee cut out top longerons allow upward pivot tail assembly method functional unsightly say leastcontinued page 89 July1976 37 Clarence Haught Bottom fuse location OK small ships like Berkeley Musketeer 42good hsnd launch Umit wire slips over tallskid Top longerons pivot DT described text avoids unsightly Vee notch Pivot points made telescoDina aluminum tubina Top longeron pivot dethermalizer actuated mode Mating pivots insure alignment rudder time picturea author THREE CLASSICS FROM THE WILLIAMS BROTHERS pJMz NORTHROP GAMMA delightful trio 1/72 scale plastic kits serious collector/builder finely detailed min iatures feature choice decals extra parts variations example Gamma may finished FROM YOUR DEALER OR ORDER DIRECT ADDING 15% ALSO AVAILABLE FLYING MODEL ACCESSORIES NE KITS 25t FOR COMPLETE CATALOG DEPT MA PAWNEE STREET Hawks Sky Chief Ellsworths Polar Star Boeing Turners racer United airliner Martin different squadron markings PRICES Gamma $295 Boeing $495 Martin $495 POSTAGE AND HANDLING S MACHINE GUN KITS EWS SAN MARCOS CALIFORNIA 9 check machine out new environ ment main thing keep sense humor dont too serious After fun should help length en life Next months column will report 1976 Toledo Show Included will interview Ernie Huber prob ably worlds best RC helicopter pilot sets up Jet Ranger fly aerobatics Also in-depth product re port Schltiter Super Baby col lective pitch unique helicopter flight training stand lets fly learning no possibility damage helicopter See contest address 2080 Sharon Rd Winter Park FL 32789 Safe Flying No Accident FF Old-Timers/Haught continued page 37 approach used locally pivot longerons directly above stab lead ing edge rather leading edge accomplished providing hori zontal pivot tube top tail assembly longerons mating half tube section fuselage longerons shown accompanying photos system also provides automatic alignment essen tial system rudder attached stab Providing above systems practical could resort popping up leading edge wing system has its uses experience nil have reasoned system would bring ship down nose-low attitude could bad Perhaps some readers could enlighten us modelers after working out acceptable DT arrangement coii sider further modifications after rules discourage modifications referring substitution sheet built-up structures etc actual practice dethermalizing imposes some ir regular loads structure must considered damage avoided Consider landing gear wire size mounting gusseting sufficient stand vertical descent over conventional glide landing about wing joints di hedral braces sheeting surface attachment contact points Give some thought DT actuation Are going use fuse mechanical timer either event location must accessible launch time Some ships quite large just managing thing engine running can real has sle Method launch can factor ROG rise off ground accepted thing Can trip timers and/or light fuse launch yourself fact may right- left-handed will influence decisions Strive layout will allow start engine alone move around launch position service timers etc release model put ting yourself unbalanced awk ward position Remember DT system no good unless activate flight Losing model its first test may impress some troops sure sets building schedule back ways Old-Timer Event Month Scale basic appeals OldTimer realistic appearance cabin-class models satisfaction enjoyable Old-Timer Scale listed SAM Special Event included contests neverthe less fun factor high event usually restricted power models some areas may allow rubber power well Models must aircraft built prior January 1943 Since no scale points given deviations scale dihedral stabilizer size can utilized increase flight performance Some scale models quite well Cabin Antique events emphasis flying ability come right down wouldnt bad idea straight across AMA scale spectrum Theres quite wide variety interest ing subjects already plan form may draw own no re strictions along line Just adhere basic guidelines Old-Timers estab lished SAM built-up structure stand ard materials good aeronautical prac tices Beginners Corner Half fun new event hobby reading about discussing others new new basic library invalua ble would suggest following essen tial cost under $12 Zaic Yearboolis 1935-36 1937 1938 Buy through AMA sub stantial savings Air Age Gas Models Reprinted Model Airplane News must con tains 21 designs 4 scale buildable right book full-size patterns etc well some very informative articles Old-Timer Plan Lists John Pond PO Box 3113 San Jose CA 95156 OldTimer list Old-Timer Flying Scale list Rubber Towline List 75 Let us know interests comments problems address Rt 5 Box 16 Coeur dAlene ID 83814 July1976 89 MARTIN B-lOB Bare Structure Bob Schafers Folly Ship designed Rod Doyleappeared 7937 Zak Yearbook Span six feet Bunch power