both pilots ERaul Pavon 1 O-ft-span tug piggybacking four-meter-span Sail plane rolls takeoff its truly awesome sight innovative cradlelrelease system has minimal drag weight pre cise release mechanism designed safely launching large model bother winch high-start Its great fun However after marty test flights found Big Lift works well threemeter class Glifrrs 118-in span tug plane too small weighs too little ef ficiently carry larger Gliders discre pancy mass causes combined center of-gravity shift center lift creating flight instability Since cradle located almost center Gliders wing carrier plane induces little torque overcome inertia Glid ers longer wing turning also becomes diffi cult Gliders larger threemeters becomes necessary Glider pilot use ailerons control Carry big Glider under conditions comes too risky both tug Glider wings rudders could collide fa tal results Having always wanted fly four-meter thermal Gliders needed suitable carrier plane large enough avoid problems combed market fotmd perfect taneously servo-operated linkage started testing launching system eaiy last yearusing two- four-meter-span Sailplanes cargo Big Lift launching system works following manner tug Glider pilot first agree direction will fly upon release Glider attached tugs cradle rubberbands tug pilot takes off flies tug attached Glider entity circling wide avoid getting planes out sight before reach ing release altitude takes three four minutes climb height like Once release altitude tug pilot turns wind applies just enough throttle maintain level flight trying match Gliders normal flight speed Glider released Glider pilot takes control ship tug pilot descends lands WHEN MOVED Houston TX several years ago faced problem launching large-size Gliders thermal altb tude Houston area flat has little low-altitude thermal activity because high humidity Lofting large-size Glider relatively high thermals no easy task began looking piggybacking possible launching alternative After some research found suitable car rier plane Multiplex Big Lift gan experimenting model air plane specifically designed tug either towing piggybacking assembled 11-lb aircraft following plans fitted four-cycle OS 120 Surpass engine Big Lift has Glider cradle made two plywood pieces lo cated between wing root side fuselage Two rubberbands hold Glider cradle released simul July 1990 81 large inflight photo frontage piece caught authors four-meter DG-300 Sailpiaie instant separation SAC trainer built expressly tug large Gliders tug powered Quadra Q40 swinging 20 x 8 prop Left close-up shot cradlelrelease mechanism SAC tug plane adjustable up 14-in wing chord platforms supports constructed hard wood piy Note linkage release points wings #108 rubberbands secure model cradle Right DG-300 Sailplane secured cradle single servo tugs wing operates mechanism simultaneous release both rubberbands Left SAC tug taking off DG-300 cargo jug-cum-Sailpiane combo weighs over 30 lb requires long takeoff roil Once airborne however will cruise launch altitude half throttle Right left authors large SAC trainer named Superlift used four-meter-size Sailplane launching right earlier smaller Multiplex tug calls Big Lift launching smaller models Left Superlift DG-300 aboard makes slow flyby camera before cruising up thermal altitude tug pilot files combo single entity until moment release Right author holding tugs tail friend Bob Brooks preparing Superlifts maiden flight Bob piloting tug author maneuvers position tail wheel added later improve ground handling solution SAC trainer unusual 120-in-span model has high-lift wing built very lightweight using aircraft blue foam plywood pine 20 x 8 prop driven Quadra Q 40 fitted onboard starter powers plane Since projected takeoff weight SAC Glider piggybacked over 30 lb reinforced fuselage adding 3/ x A-in pine spar front section engine mounting plate doubled second A-in plywood plate easy ac cess batteries electronics fas tened three large hatches frame -in ply bottom fuselage front sec tion 4-40 screws fully sheeted wing center section provided trailing edge connect sol idly fuselage frame doubled landing gear stiffen added tail wheel improve ground handling en tire nose section tail end epox ied two layers glass clotha bidirec tional top layer over unidirectional base layer Because Id using seven high-torque servos draw large amounts cur rent receivers battery pack re ceiver glitches real possibility employed Jomar optical interface between receiver servos circumvent danger Two separate battery packs drive receiver servos third pow ers onboard engine starter During assembly also made several ad ditions wing center section stallation two cradle supports servo-operated release mechanism Gaining enough torque overcome Gliders wing inertia called widely spaced cradle supports accomplished installing boxes built around ends wing center section main spar arrange Continued page 84 82 Model Aviation want FAST right out box no other electric comes close GP Marine Stinger Its unique Twinline Drive System turns energy two rugged 550 motors long-lasting water spraying rush power hull designed make its speed easy control Stinger meant raceand win Entirely pre-assembled except required 2-channel radio battery installation Stinger continues blasting through water J LVj j after maneuvers leave its competition bobbing behind Apply included decals sizzling scale appearance youre ready fly See hobby dealer write us today ment has two major benefits First 22-in separation cradle attachment points increases torque Second Glider wing incidence parallel tug wing incidence assures Glid er flying its own weight creating load cradle platforms built can adjusted Gliders wing chords up 14 As two release points rubberbands attach Glider cradle separated 22 necessary install release servo central point inside wing pre vent uneven separation Glider cradle upon release could result fatal midair accident synchronizing servo linkage two release points essential finished SAC trainer weighs little under 24 lbbig Gliders four-meter 157-in span range first test flight took place April 1989 using four-meter Alpina Glider cargo Since Ive made flights carrying Gliders larger 35 ters 138-in span apparent prob lems tug/Glider duo size works well because combined center-of-gravity re mains should Turns no longer problem flying re lease altitude done tug pilot big biplane-like combination stable docile flight pilot can make low passes before flying Glid ers release altitude Its important keep mind since takeoff weight tug-cum-Glider ex ceeds 30 lb long takeoff roll necessary gain lift-off speed air carrier launching system does what intended greatly extends Glid er flights Spans 20 minutes longer now quite normal An additional reward since system requires minimum two pilots encourages cooperation teamwork Its also crowd pleaser used club demonstrations hope findings will encourage others live areas less ideal conditions launching big thermal Glid ers try piggyback approach can sure tug size rolling lift off four-meter Glider atop awe some sight indeed Super Squire/ Windingland-Daley Continued page 37 Six 1/16 x x 36-in balsacap strips Two 1 x 1 x 12-in balsawing tips Two 4 x 36-in triangle balsabracing 4 x 6 x 12-in plywoodF-l land ing gear brace wing hold-down / x 6 x 12-in plywoodF-2 F-3 hatch dihedral brace Safety/Preston Continued page 22 somewhere connector wiring Sams sons receiver battery pack However big mystery took five days smoke develop Anyway purpose relating two incidents remind Ni-Cd battery pack capable generating enough heat start fire event becomes shorted Its reasonable suggest store batteries away combustibles would mean removing models time return flying session ever careful what you think dead want discard CyA glue accelerators May 90 Safety column mentioned letter Albert Perdon drew attention fact some CyA ac celerators contain chlorofluorocarbons CFCs linked alleged depletion mospheric ozone layer so-called green house effect also mentioned number modelers have respiratory problems resulting use CyA accelerators asked anyone knew nonallergenic accelerator guess should have asked anyone knew commercial source such product because four readers reminded baking soda can used accelerator unlikely cause respiratory problems its also very cheap Jim Wolff Charlie Staunton VAI couldnt read last name both use mixture baking soda water accelera tor However neither Jim nor Charlie stated what proportion baking soda water use 84 Model Aviation TM ~RTM ~ODE 0 S COSPAN
Edition: Model Aviation - 1990/07
Page Numbers: 81, 82, 84
both pilots ERaul Pavon 1 O-ft-span tug piggybacking four-meter-span Sail plane rolls takeoff its truly awesome sight innovative cradlelrelease system has minimal drag weight pre cise release mechanism designed safely launching large model bother winch high-start Its great fun However after marty test flights found Big Lift works well threemeter class Glifrrs 118-in span tug plane too small weighs too little ef ficiently carry larger Gliders discre pancy mass causes combined center of-gravity shift center lift creating flight instability Since cradle located almost center Gliders wing carrier plane induces little torque overcome inertia Glid ers longer wing turning also becomes diffi cult Gliders larger threemeters becomes necessary Glider pilot use ailerons control Carry big Glider under conditions comes too risky both tug Glider wings rudders could collide fa tal results Having always wanted fly four-meter thermal Gliders needed suitable carrier plane large enough avoid problems combed market fotmd perfect taneously servo-operated linkage started testing launching system eaiy last yearusing two- four-meter-span Sailplanes cargo Big Lift launching system works following manner tug Glider pilot first agree direction will fly upon release Glider attached tugs cradle rubberbands tug pilot takes off flies tug attached Glider entity circling wide avoid getting planes out sight before reach ing release altitude takes three four minutes climb height like Once release altitude tug pilot turns wind applies just enough throttle maintain level flight trying match Gliders normal flight speed Glider released Glider pilot takes control ship tug pilot descends lands WHEN MOVED Houston TX several years ago faced problem launching large-size Gliders thermal altb tude Houston area flat has little low-altitude thermal activity because high humidity Lofting large-size Glider relatively high thermals no easy task began looking piggybacking possible launching alternative After some research found suitable car rier plane Multiplex Big Lift gan experimenting model air plane specifically designed tug either towing piggybacking assembled 11-lb aircraft following plans fitted four-cycle OS 120 Surpass engine Big Lift has Glider cradle made two plywood pieces lo cated between wing root side fuselage Two rubberbands hold Glider cradle released simul July 1990 81 large inflight photo frontage piece caught authors four-meter DG-300 Sailpiaie instant separation SAC trainer built expressly tug large Gliders tug powered Quadra Q40 swinging 20 x 8 prop Left close-up shot cradlelrelease mechanism SAC tug plane adjustable up 14-in wing chord platforms supports constructed hard wood piy Note linkage release points wings #108 rubberbands secure model cradle Right DG-300 Sailplane secured cradle single servo tugs wing operates mechanism simultaneous release both rubberbands Left SAC tug taking off DG-300 cargo jug-cum-Sailpiane combo weighs over 30 lb requires long takeoff roil Once airborne however will cruise launch altitude half throttle Right left authors large SAC trainer named Superlift used four-meter-size Sailplane launching right earlier smaller Multiplex tug calls Big Lift launching smaller models Left Superlift DG-300 aboard makes slow flyby camera before cruising up thermal altitude tug pilot files combo single entity until moment release Right author holding tugs tail friend Bob Brooks preparing Superlifts maiden flight Bob piloting tug author maneuvers position tail wheel added later improve ground handling solution SAC trainer unusual 120-in-span model has high-lift wing built very lightweight using aircraft blue foam plywood pine 20 x 8 prop driven Quadra Q 40 fitted onboard starter powers plane Since projected takeoff weight SAC Glider piggybacked over 30 lb reinforced fuselage adding 3/ x A-in pine spar front section engine mounting plate doubled second A-in plywood plate easy ac cess batteries electronics fas tened three large hatches frame -in ply bottom fuselage front sec tion 4-40 screws fully sheeted wing center section provided trailing edge connect sol idly fuselage frame doubled landing gear stiffen added tail wheel improve ground handling en tire nose section tail end epox ied two layers glass clotha bidirec tional top layer over unidirectional base layer Because Id using seven high-torque servos draw large amounts cur rent receivers battery pack re ceiver glitches real possibility employed Jomar optical interface between receiver servos circumvent danger Two separate battery packs drive receiver servos third pow ers onboard engine starter During assembly also made several ad ditions wing center section stallation two cradle supports servo-operated release mechanism Gaining enough torque overcome Gliders wing inertia called widely spaced cradle supports accomplished installing boxes built around ends wing center section main spar arrange Continued page 84 82 Model Aviation want FAST right out box no other electric comes close GP Marine Stinger Its unique Twinline Drive System turns energy two rugged 550 motors long-lasting water spraying rush power hull designed make its speed easy control Stinger meant raceand win Entirely pre-assembled except required 2-channel radio battery installation Stinger continues blasting through water J LVj j after maneuvers leave its competition bobbing behind Apply included decals sizzling scale appearance youre ready fly See hobby dealer write us today ment has two major benefits First 22-in separation cradle attachment points increases torque Second Glider wing incidence parallel tug wing incidence assures Glid er flying its own weight creating load cradle platforms built can adjusted Gliders wing chords up 14 As two release points rubberbands attach Glider cradle separated 22 necessary install release servo central point inside wing pre vent uneven separation Glider cradle upon release could result fatal midair accident synchronizing servo linkage two release points essential finished SAC trainer weighs little under 24 lbbig Gliders four-meter 157-in span range first test flight took place April 1989 using four-meter Alpina Glider cargo Since Ive made flights carrying Gliders larger 35 ters 138-in span apparent prob lems tug/Glider duo size works well because combined center-of-gravity re mains should Turns no longer problem flying re lease altitude done tug pilot big biplane-like combination stable docile flight pilot can make low passes before flying Glid ers release altitude Its important keep mind since takeoff weight tug-cum-Glider ex ceeds 30 lb long takeoff roll necessary gain lift-off speed air carrier launching system does what intended greatly extends Glid er flights Spans 20 minutes longer now quite normal An additional reward since system requires minimum two pilots encourages cooperation teamwork Its also crowd pleaser used club demonstrations hope findings will encourage others live areas less ideal conditions launching big thermal Glid ers try piggyback approach can sure tug size rolling lift off four-meter Glider atop awe some sight indeed Super Squire/ Windingland-Daley Continued page 37 Six 1/16 x x 36-in balsacap strips Two 1 x 1 x 12-in balsawing tips Two 4 x 36-in triangle balsabracing 4 x 6 x 12-in plywoodF-l land ing gear brace wing hold-down / x 6 x 12-in plywoodF-2 F-3 hatch dihedral brace Safety/Preston Continued page 22 somewhere connector wiring Sams sons receiver battery pack However big mystery took five days smoke develop Anyway purpose relating two incidents remind Ni-Cd battery pack capable generating enough heat start fire event becomes shorted Its reasonable suggest store batteries away combustibles would mean removing models time return flying session ever careful what you think dead want discard CyA glue accelerators May 90 Safety column mentioned letter Albert Perdon drew attention fact some CyA ac celerators contain chlorofluorocarbons CFCs linked alleged depletion mospheric ozone layer so-called green house effect also mentioned number modelers have respiratory problems resulting use CyA accelerators asked anyone knew nonallergenic accelerator guess should have asked anyone knew commercial source such product because four readers reminded baking soda can used accelerator unlikely cause respiratory problems its also very cheap Jim Wolff Charlie Staunton VAI couldnt read last name both use mixture baking soda water accelera tor However neither Jim nor Charlie stated what proportion baking soda water use 84 Model Aviation TM ~RTM ~ODE 0 S COSPAN
Edition: Model Aviation - 1990/07
Page Numbers: 81, 82, 84
both pilots ERaul Pavon 1 O-ft-span tug piggybacking four-meter-span Sail plane rolls takeoff its truly awesome sight innovative cradlelrelease system has minimal drag weight pre cise release mechanism designed safely launching large model bother winch high-start Its great fun However after marty test flights found Big Lift works well threemeter class Glifrrs 118-in span tug plane too small weighs too little ef ficiently carry larger Gliders discre pancy mass causes combined center of-gravity shift center lift creating flight instability Since cradle located almost center Gliders wing carrier plane induces little torque overcome inertia Glid ers longer wing turning also becomes diffi cult Gliders larger threemeters becomes necessary Glider pilot use ailerons control Carry big Glider under conditions comes too risky both tug Glider wings rudders could collide fa tal results Having always wanted fly four-meter thermal Gliders needed suitable carrier plane large enough avoid problems combed market fotmd perfect taneously servo-operated linkage started testing launching system eaiy last yearusing two- four-meter-span Sailplanes cargo Big Lift launching system works following manner tug Glider pilot first agree direction will fly upon release Glider attached tugs cradle rubberbands tug pilot takes off flies tug attached Glider entity circling wide avoid getting planes out sight before reach ing release altitude takes three four minutes climb height like Once release altitude tug pilot turns wind applies just enough throttle maintain level flight trying match Gliders normal flight speed Glider released Glider pilot takes control ship tug pilot descends lands WHEN MOVED Houston TX several years ago faced problem launching large-size Gliders thermal altb tude Houston area flat has little low-altitude thermal activity because high humidity Lofting large-size Glider relatively high thermals no easy task began looking piggybacking possible launching alternative After some research found suitable car rier plane Multiplex Big Lift gan experimenting model air plane specifically designed tug either towing piggybacking assembled 11-lb aircraft following plans fitted four-cycle OS 120 Surpass engine Big Lift has Glider cradle made two plywood pieces lo cated between wing root side fuselage Two rubberbands hold Glider cradle released simul July 1990 81 large inflight photo frontage piece caught authors four-meter DG-300 Sailpiaie instant separation SAC trainer built expressly tug large Gliders tug powered Quadra Q40 swinging 20 x 8 prop Left close-up shot cradlelrelease mechanism SAC tug plane adjustable up 14-in wing chord platforms supports constructed hard wood piy Note linkage release points wings #108 rubberbands secure model cradle Right DG-300 Sailplane secured cradle single servo tugs wing operates mechanism simultaneous release both rubberbands Left SAC tug taking off DG-300 cargo jug-cum-Sailpiane combo weighs over 30 lb requires long takeoff roil Once airborne however will cruise launch altitude half throttle Right left authors large SAC trainer named Superlift used four-meter-size Sailplane launching right earlier smaller Multiplex tug calls Big Lift launching smaller models Left Superlift DG-300 aboard makes slow flyby camera before cruising up thermal altitude tug pilot files combo single entity until moment release Right author holding tugs tail friend Bob Brooks preparing Superlifts maiden flight Bob piloting tug author maneuvers position tail wheel added later improve ground handling solution SAC trainer unusual 120-in-span model has high-lift wing built very lightweight using aircraft blue foam plywood pine 20 x 8 prop driven Quadra Q 40 fitted onboard starter powers plane Since projected takeoff weight SAC Glider piggybacked over 30 lb reinforced fuselage adding 3/ x A-in pine spar front section engine mounting plate doubled second A-in plywood plate easy ac cess batteries electronics fas tened three large hatches frame -in ply bottom fuselage front sec tion 4-40 screws fully sheeted wing center section provided trailing edge connect sol idly fuselage frame doubled landing gear stiffen added tail wheel improve ground handling en tire nose section tail end epox ied two layers glass clotha bidirec tional top layer over unidirectional base layer Because Id using seven high-torque servos draw large amounts cur rent receivers battery pack re ceiver glitches real possibility employed Jomar optical interface between receiver servos circumvent danger Two separate battery packs drive receiver servos third pow ers onboard engine starter During assembly also made several ad ditions wing center section stallation two cradle supports servo-operated release mechanism Gaining enough torque overcome Gliders wing inertia called widely spaced cradle supports accomplished installing boxes built around ends wing center section main spar arrange Continued page 84 82 Model Aviation want FAST right out box no other electric comes close GP Marine Stinger Its unique Twinline Drive System turns energy two rugged 550 motors long-lasting water spraying rush power hull designed make its speed easy control Stinger meant raceand win Entirely pre-assembled except required 2-channel radio battery installation Stinger continues blasting through water J LVj j after maneuvers leave its competition bobbing behind Apply included decals sizzling scale appearance youre ready fly See hobby dealer write us today ment has two major benefits First 22-in separation cradle attachment points increases torque Second Glider wing incidence parallel tug wing incidence assures Glid er flying its own weight creating load cradle platforms built can adjusted Gliders wing chords up 14 As two release points rubberbands attach Glider cradle separated 22 necessary install release servo central point inside wing pre vent uneven separation Glider cradle upon release could result fatal midair accident synchronizing servo linkage two release points essential finished SAC trainer weighs little under 24 lbbig Gliders four-meter 157-in span range first test flight took place April 1989 using four-meter Alpina Glider cargo Since Ive made flights carrying Gliders larger 35 ters 138-in span apparent prob lems tug/Glider duo size works well because combined center-of-gravity re mains should Turns no longer problem flying re lease altitude done tug pilot big biplane-like combination stable docile flight pilot can make low passes before flying Glid ers release altitude Its important keep mind since takeoff weight tug-cum-Glider ex ceeds 30 lb long takeoff roll necessary gain lift-off speed air carrier launching system does what intended greatly extends Glid er flights Spans 20 minutes longer now quite normal An additional reward since system requires minimum two pilots encourages cooperation teamwork Its also crowd pleaser used club demonstrations hope findings will encourage others live areas less ideal conditions launching big thermal Glid ers try piggyback approach can sure tug size rolling lift off four-meter Glider atop awe some sight indeed Super Squire/ Windingland-Daley Continued page 37 Six 1/16 x x 36-in balsacap strips Two 1 x 1 x 12-in balsawing tips Two 4 x 36-in triangle balsabracing 4 x 6 x 12-in plywoodF-l land ing gear brace wing hold-down / x 6 x 12-in plywoodF-2 F-3 hatch dihedral brace Safety/Preston Continued page 22 somewhere connector wiring Sams sons receiver battery pack However big mystery took five days smoke develop Anyway purpose relating two incidents remind Ni-Cd battery pack capable generating enough heat start fire event becomes shorted Its reasonable suggest store batteries away combustibles would mean removing models time return flying session ever careful what you think dead want discard CyA glue accelerators May 90 Safety column mentioned letter Albert Perdon drew attention fact some CyA ac celerators contain chlorofluorocarbons CFCs linked alleged depletion mospheric ozone layer so-called green house effect also mentioned number modelers have respiratory problems resulting use CyA accelerators asked anyone knew nonallergenic accelerator guess should have asked anyone knew commercial source such product because four readers reminded baking soda can used accelerator unlikely cause respiratory problems its also very cheap Jim Wolff Charlie Staunton VAI couldnt read last name both use mixture baking soda water accelera tor However neither Jim nor Charlie stated what proportion baking soda water use 84 Model Aviation TM ~RTM ~ODE 0 S COSPAN