p Indoor 0 Bud Tenny ANOTHER NIMAS INTERNATS Tentative planning now underway late February National Indoor Model Airplane Society will have another International Record Trials Northwood Institute West Baden Indiana early June Actually activity will ex panded include both NIMAS event opening rounds Central Zone qualification trials select US Team 1978 Indoor World Cham pionship Final decision time ac tivity will come time compatible next issue column interested can get information NIMAS Internats sending selfaddressed stamped envelope Box 545 Richardson TX 75080 Jigs insure Accuracy Motorsticks tail booms rolled special forms flying surfaces use special templates stead plans does whole model get properly aligned Well some propped up toolboxes stacks books easy way use four-piece all-purpose set alignment jigs Such set described below has served well about ten years Since portable set jigs has travelled hundreds miles has helped re pair re-align models virtually major contest have attended Fuselage Cradle Fig 1 shows fuselage cradle facilitates assembly repair alignment incidence measurements used tail-boom support shown Fig 2 two jigs should constructed similar height adjustable tail-boom support about cen tered its adjustment range way tail boom can slant up down respect centerline motorstick Fig 3 shows support jig stiffening tail boom stab being braced Fig 1 Fig 2 TISSUE SOCKET TAIL BOOM STAND Dynamic Duo Fig 4 shows view multipurpose adjustable stand Any basic task will require two some special wing-bracing tasks could require four Note support bar affixed vertical wire rods piece rubber tubingneoprene fuel line proper size ideal use rubber tubing gives two advantages friction wire helps hold setting rubber allows bar adjusted end higher other MULTI-PURPOSE STAND Field Repair broken tail boom normally spells end flying repairs possible back workbench Fig 5 shows fuselage cradle two adjusta ble stands helping make tail-boom re pair built-up tail boom Note ends tail boom have quite aligned careful adjustment height angle stands allowed exact match before glucing pieces together same model first ing built tail boom supported tail-boom support Fig 3 stab held proper angle tilt wash-in left leading edge stab raised give slight twist aids tail boom hold proper stab tilt before stab glued tail boom Wing Bracing Fig 6 shows adjustable stands holding wing prior bracing first step bracing standard bracing jig assemble wing posts cabane Fig 7 Next support wing stands stands set low er wing will posts lower post/cabane assembly over wing plug support block Note socket spacing sup mWING SPAR POST TISSUE SOCKET WING CHORD Fig 7 I Fig 8 port block should exactly same motorstick Next raise wing carefully right height raising support bars Set measure washin/wash-out wing twist sure ex continued page 98 38 Model Aviation Fig 5 Field repairs easy wsn muse extra hands hold model Fig 3 Tail-boom stand steadies model dur ing bracing operation Fig 6 Wing bracing adjustable multi purpose stands see local hobby dealer o Stahl designa lkJ~ olmast 40 yeors ago 5__ ____________ OGA * los Earl StuNs famous RUBBER & CO2 WINNER AT THE 50th NATS Rondo Spds 58 WINGSPAN Send free brochure 4 FLYLINE MODELS 22 1/2 WINGSPAN 10643 ASHBY PL FAIRFAX VA 22030 RUBBER POWERED FLYING MODELS NEW Kits 28 IN SPAN \PORT$~ORTs475 uis ViN*Off Rite U 13 IN SPAN P-NUT KIT S349~ O ae*Wte~ 13 IN SPAN P-NUTKIT $34916 IN SPAN SPORT $349 Peck-Pefymers PO BOX 2498-AMA Continued page 97 light sanding cover chromecoat Using rubber cement adhesive coat both paper wing core being sure its dry before proceeding covering Lay bottom wing surface chromecoat sup ported flat surface roll wing around leading edge back across top wing surface Take care twist warps wing wing panels now ready joining Sand bevel butts attain required 4 dihedral under tip Join 5-minute epoxy cover joint 4-in wide fiberglass cloth ad hered thinned epoxy Epoxy tip blocks place Sand fill wing ready finish wish use foam core covered balsa may omit spar trailing edge desire built-up wing cut ribs shape stacking seventeen 3/32 balsa rib blanks between root- tip-rib tem plates carve sand shape Lay down leading trailing edges plan add bottom leading edge sheet fit bot tom cap strips Glue bottom spar sheet ing add ribs dry add top spar remove plan Build remaining wing stage join proper di hedral Reinforce spar joints 3/32in dihedral brace cut fit behind spars Fit top leading edge sheeting cap strips sheet center section Glue wing tip blocks place sand completed wing PEANUT SCALE KITS PIETENPOL$329 MILES$329 TURBULENT$329 PIPER J3 CUB$329 ANDREASON$349 COUGAR $349 MUSTANG$349 ZERO-$349 SPORT MODEL KITS STRINGLESS WONDER$249 PECK ROG .$139 KITS 0 PLANS 0 ACCESSORIES CO-2 ENGINES SNARK & BROWN REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 5O MANY NARD TO FIND ITEMS LA MESA CALIF 92041 PNONE 714 469-8675 714 442-4636 final shape Built-up wings cap strips satis factory flying site free weeds other sharp objects rugged wing fully sheeted variety con struction procedure basically same except cap strips replaced sheet balsa Make up wing skins ad vance construction Sheet balsa straight enough join edge edge out first trimming trim overlap edges joined straightedge down center overlap run along straightedge sharp knife razor blade thus trimming both edges once Any irregularities trimming will correspond sheet matched resulting custom fit Lay down piece Saran Wrap fit edges sheet together holding securely join Zap equivalent An alternate method gluing join sheets masking tape flat Pick up taped sheets fold open joint apply balsa cement Lay sheets back bench tape side down secure until dry Re move tape sand outside surface absolute ultimate strength cover sheeted wing -oz fiberglass cloth adhered Hobby Poxy Formula II thinned 100% methanol brushed through cloth Finish Mountaineer favorite materials As late have using thinned out Hobby Poxy Stuff filling grain dis count-store spray-can enamel color paints dry quickly look great besides costing very little After finishing components reinstall radio hook up controls check trav el check assembled model proper balance noted plans Ballast neces sary little nose heavy OK tail heavy model disastrous Flying Prior launching slope test glide model over level ground deter neutral control settings satis factory model should glide straight no stall diving tendencies Adjust pushrods accordingly have flown hill fore would offer basic comments Launch directly wind angle slope prepared apply slight down elevator avoid stall slopers tend ballon launch get familiar flight characteristics Mountaineer fly figure-eight pattern 100-feet out making turns away hill Let model drift toward slope crosses front prior turning wind next leg flying back toward down wind keep mind ground speed will sum normal flying speed plus wind normal tendency slow model apparent speed going wind normal speed less wind speed can produce unexpected stall hillside landings choice suggest landing low cross-slope pass nose model quartered wind feeding down eleva tor Dont forget hot coffee gets chilly out hill FF Indoor/Tenny continued page 38 actly correct Stand back visually spect wing alignment glue wing posts cabane Fig 8 shows wing should appear note stands just outside dihedral joints primary bracing wires can attached before moving anything Finally Fig 9 Fig 9 shows stands supporting tips dihedral joints glued dotted lines show secondary bracing used Have Stands Will Travel now apparent flat surface con98 Model Aviation 24 lIZ WINGSPAN 5 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAX test enables model set up re paired and/or re-aligned using exactly same fixtures built sur face Fig 5 model carrying box Since base fixture wide balsa strip pins work well building board home masking tape ideal contest Plan Ahead limitation Ive found own version devices de scribed future shock couldnt envision would ever need 7/2 wing chord wires adjustable stands 7 apart Oops Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught continued page 39 right cabin left Some cabin ships will climb right just well would recommend left safe side Power turn usually induced engine side-thrust subject thrust adjustments old-timers need downthrust rarely called out plan About 2 degrees good starting point should now ready flight tests Hand glide ship wind check diving stalling tendencies Correct changing incidence either wing stab prefer make adjust ments stabilizer because changing wing incidence effectively changes thrust line Also turning tendencies should observed Due limited duration hand glide slight turn should apparent Begin power tests 5-second engine run shorter run will tell enough longer may prove disas trous trim far off engine should adjusted reasonable amount thrust Extremely low power wont really tell anything could lead stall As soon possible increase power normal models behave consider ably different power increases trim ming done low power will have re done anyhow Gradually lengthen engine run ob serving flight pattern Adjust climb pat tern thrust and/or incidence adjust ments Make adjustment time Dont worry too much about glide trim long its safe stage Once power pattern good can correct glide speed small shifts center gravity addition ballast Glide turn can also induced adding short approximately 6 piece Vi X 1 tapered trailing edge stock bot tom trailing edge inboard wing thin edge forward Some modelers prefer hinged drag flap purpose experience nil Ill mis direct score Transition power glide influ enced power turn having trouble transitions try tighter pow er turn will reduce effective cidence may have increase maintain climb angle Looping tenden cies can corrected down-thrust power turn Think out problem observe things arent going too well pack up go home can devote unpressured thought prob lem Never rush flight trimming proce dures Fuel Tests mail indicates testing various fuels improved serv ice life better power Phil Mahony Lime Rock CT has experimenting Castrol R-40 Phil claims less heat oil uses Amoco high-test no-lead gasoline Phil didnt indicate mixing ratio 3 1 would good start Mark Fechner oit Salt Lake way has run some interesting tests using O&R 19 side-port engine Y&O 10-4 prop using various oils combustibles always comparing back good old SAE 70 oil accompanying chart shows results Marks tests Mark accomplished engine conversion spe cialist plan obtain Marks Continued page 100 June 1977 99
Edition: Model Aviation - 1977/06
Page Numbers: 38, 98, 99
p Indoor 0 Bud Tenny ANOTHER NIMAS INTERNATS Tentative planning now underway late February National Indoor Model Airplane Society will have another International Record Trials Northwood Institute West Baden Indiana early June Actually activity will ex panded include both NIMAS event opening rounds Central Zone qualification trials select US Team 1978 Indoor World Cham pionship Final decision time ac tivity will come time compatible next issue column interested can get information NIMAS Internats sending selfaddressed stamped envelope Box 545 Richardson TX 75080 Jigs insure Accuracy Motorsticks tail booms rolled special forms flying surfaces use special templates stead plans does whole model get properly aligned Well some propped up toolboxes stacks books easy way use four-piece all-purpose set alignment jigs Such set described below has served well about ten years Since portable set jigs has travelled hundreds miles has helped re pair re-align models virtually major contest have attended Fuselage Cradle Fig 1 shows fuselage cradle facilitates assembly repair alignment incidence measurements used tail-boom support shown Fig 2 two jigs should constructed similar height adjustable tail-boom support about cen tered its adjustment range way tail boom can slant up down respect centerline motorstick Fig 3 shows support jig stiffening tail boom stab being braced Fig 1 Fig 2 TISSUE SOCKET TAIL BOOM STAND Dynamic Duo Fig 4 shows view multipurpose adjustable stand Any basic task will require two some special wing-bracing tasks could require four Note support bar affixed vertical wire rods piece rubber tubingneoprene fuel line proper size ideal use rubber tubing gives two advantages friction wire helps hold setting rubber allows bar adjusted end higher other MULTI-PURPOSE STAND Field Repair broken tail boom normally spells end flying repairs possible back workbench Fig 5 shows fuselage cradle two adjusta ble stands helping make tail-boom re pair built-up tail boom Note ends tail boom have quite aligned careful adjustment height angle stands allowed exact match before glucing pieces together same model first ing built tail boom supported tail-boom support Fig 3 stab held proper angle tilt wash-in left leading edge stab raised give slight twist aids tail boom hold proper stab tilt before stab glued tail boom Wing Bracing Fig 6 shows adjustable stands holding wing prior bracing first step bracing standard bracing jig assemble wing posts cabane Fig 7 Next support wing stands stands set low er wing will posts lower post/cabane assembly over wing plug support block Note socket spacing sup mWING SPAR POST TISSUE SOCKET WING CHORD Fig 7 I Fig 8 port block should exactly same motorstick Next raise wing carefully right height raising support bars Set measure washin/wash-out wing twist sure ex continued page 98 38 Model Aviation Fig 5 Field repairs easy wsn muse extra hands hold model Fig 3 Tail-boom stand steadies model dur ing bracing operation Fig 6 Wing bracing adjustable multi purpose stands see local hobby dealer o Stahl designa lkJ~ olmast 40 yeors ago 5__ ____________ OGA * los Earl StuNs famous RUBBER & CO2 WINNER AT THE 50th NATS Rondo Spds 58 WINGSPAN Send free brochure 4 FLYLINE MODELS 22 1/2 WINGSPAN 10643 ASHBY PL FAIRFAX VA 22030 RUBBER POWERED FLYING MODELS NEW Kits 28 IN SPAN \PORT$~ORTs475 uis ViN*Off Rite U 13 IN SPAN P-NUT KIT S349~ O ae*Wte~ 13 IN SPAN P-NUTKIT $34916 IN SPAN SPORT $349 Peck-Pefymers PO BOX 2498-AMA Continued page 97 light sanding cover chromecoat Using rubber cement adhesive coat both paper wing core being sure its dry before proceeding covering Lay bottom wing surface chromecoat sup ported flat surface roll wing around leading edge back across top wing surface Take care twist warps wing wing panels now ready joining Sand bevel butts attain required 4 dihedral under tip Join 5-minute epoxy cover joint 4-in wide fiberglass cloth ad hered thinned epoxy Epoxy tip blocks place Sand fill wing ready finish wish use foam core covered balsa may omit spar trailing edge desire built-up wing cut ribs shape stacking seventeen 3/32 balsa rib blanks between root- tip-rib tem plates carve sand shape Lay down leading trailing edges plan add bottom leading edge sheet fit bot tom cap strips Glue bottom spar sheet ing add ribs dry add top spar remove plan Build remaining wing stage join proper di hedral Reinforce spar joints 3/32in dihedral brace cut fit behind spars Fit top leading edge sheeting cap strips sheet center section Glue wing tip blocks place sand completed wing PEANUT SCALE KITS PIETENPOL$329 MILES$329 TURBULENT$329 PIPER J3 CUB$329 ANDREASON$349 COUGAR $349 MUSTANG$349 ZERO-$349 SPORT MODEL KITS STRINGLESS WONDER$249 PECK ROG .$139 KITS 0 PLANS 0 ACCESSORIES CO-2 ENGINES SNARK & BROWN REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 5O MANY NARD TO FIND ITEMS LA MESA CALIF 92041 PNONE 714 469-8675 714 442-4636 final shape Built-up wings cap strips satis factory flying site free weeds other sharp objects rugged wing fully sheeted variety con struction procedure basically same except cap strips replaced sheet balsa Make up wing skins ad vance construction Sheet balsa straight enough join edge edge out first trimming trim overlap edges joined straightedge down center overlap run along straightedge sharp knife razor blade thus trimming both edges once Any irregularities trimming will correspond sheet matched resulting custom fit Lay down piece Saran Wrap fit edges sheet together holding securely join Zap equivalent An alternate method gluing join sheets masking tape flat Pick up taped sheets fold open joint apply balsa cement Lay sheets back bench tape side down secure until dry Re move tape sand outside surface absolute ultimate strength cover sheeted wing -oz fiberglass cloth adhered Hobby Poxy Formula II thinned 100% methanol brushed through cloth Finish Mountaineer favorite materials As late have using thinned out Hobby Poxy Stuff filling grain dis count-store spray-can enamel color paints dry quickly look great besides costing very little After finishing components reinstall radio hook up controls check trav el check assembled model proper balance noted plans Ballast neces sary little nose heavy OK tail heavy model disastrous Flying Prior launching slope test glide model over level ground deter neutral control settings satis factory model should glide straight no stall diving tendencies Adjust pushrods accordingly have flown hill fore would offer basic comments Launch directly wind angle slope prepared apply slight down elevator avoid stall slopers tend ballon launch get familiar flight characteristics Mountaineer fly figure-eight pattern 100-feet out making turns away hill Let model drift toward slope crosses front prior turning wind next leg flying back toward down wind keep mind ground speed will sum normal flying speed plus wind normal tendency slow model apparent speed going wind normal speed less wind speed can produce unexpected stall hillside landings choice suggest landing low cross-slope pass nose model quartered wind feeding down eleva tor Dont forget hot coffee gets chilly out hill FF Indoor/Tenny continued page 38 actly correct Stand back visually spect wing alignment glue wing posts cabane Fig 8 shows wing should appear note stands just outside dihedral joints primary bracing wires can attached before moving anything Finally Fig 9 Fig 9 shows stands supporting tips dihedral joints glued dotted lines show secondary bracing used Have Stands Will Travel now apparent flat surface con98 Model Aviation 24 lIZ WINGSPAN 5 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAX test enables model set up re paired and/or re-aligned using exactly same fixtures built sur face Fig 5 model carrying box Since base fixture wide balsa strip pins work well building board home masking tape ideal contest Plan Ahead limitation Ive found own version devices de scribed future shock couldnt envision would ever need 7/2 wing chord wires adjustable stands 7 apart Oops Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught continued page 39 right cabin left Some cabin ships will climb right just well would recommend left safe side Power turn usually induced engine side-thrust subject thrust adjustments old-timers need downthrust rarely called out plan About 2 degrees good starting point should now ready flight tests Hand glide ship wind check diving stalling tendencies Correct changing incidence either wing stab prefer make adjust ments stabilizer because changing wing incidence effectively changes thrust line Also turning tendencies should observed Due limited duration hand glide slight turn should apparent Begin power tests 5-second engine run shorter run will tell enough longer may prove disas trous trim far off engine should adjusted reasonable amount thrust Extremely low power wont really tell anything could lead stall As soon possible increase power normal models behave consider ably different power increases trim ming done low power will have re done anyhow Gradually lengthen engine run ob serving flight pattern Adjust climb pat tern thrust and/or incidence adjust ments Make adjustment time Dont worry too much about glide trim long its safe stage Once power pattern good can correct glide speed small shifts center gravity addition ballast Glide turn can also induced adding short approximately 6 piece Vi X 1 tapered trailing edge stock bot tom trailing edge inboard wing thin edge forward Some modelers prefer hinged drag flap purpose experience nil Ill mis direct score Transition power glide influ enced power turn having trouble transitions try tighter pow er turn will reduce effective cidence may have increase maintain climb angle Looping tenden cies can corrected down-thrust power turn Think out problem observe things arent going too well pack up go home can devote unpressured thought prob lem Never rush flight trimming proce dures Fuel Tests mail indicates testing various fuels improved serv ice life better power Phil Mahony Lime Rock CT has experimenting Castrol R-40 Phil claims less heat oil uses Amoco high-test no-lead gasoline Phil didnt indicate mixing ratio 3 1 would good start Mark Fechner oit Salt Lake way has run some interesting tests using O&R 19 side-port engine Y&O 10-4 prop using various oils combustibles always comparing back good old SAE 70 oil accompanying chart shows results Marks tests Mark accomplished engine conversion spe cialist plan obtain Marks Continued page 100 June 1977 99
Edition: Model Aviation - 1977/06
Page Numbers: 38, 98, 99
p Indoor 0 Bud Tenny ANOTHER NIMAS INTERNATS Tentative planning now underway late February National Indoor Model Airplane Society will have another International Record Trials Northwood Institute West Baden Indiana early June Actually activity will ex panded include both NIMAS event opening rounds Central Zone qualification trials select US Team 1978 Indoor World Cham pionship Final decision time ac tivity will come time compatible next issue column interested can get information NIMAS Internats sending selfaddressed stamped envelope Box 545 Richardson TX 75080 Jigs insure Accuracy Motorsticks tail booms rolled special forms flying surfaces use special templates stead plans does whole model get properly aligned Well some propped up toolboxes stacks books easy way use four-piece all-purpose set alignment jigs Such set described below has served well about ten years Since portable set jigs has travelled hundreds miles has helped re pair re-align models virtually major contest have attended Fuselage Cradle Fig 1 shows fuselage cradle facilitates assembly repair alignment incidence measurements used tail-boom support shown Fig 2 two jigs should constructed similar height adjustable tail-boom support about cen tered its adjustment range way tail boom can slant up down respect centerline motorstick Fig 3 shows support jig stiffening tail boom stab being braced Fig 1 Fig 2 TISSUE SOCKET TAIL BOOM STAND Dynamic Duo Fig 4 shows view multipurpose adjustable stand Any basic task will require two some special wing-bracing tasks could require four Note support bar affixed vertical wire rods piece rubber tubingneoprene fuel line proper size ideal use rubber tubing gives two advantages friction wire helps hold setting rubber allows bar adjusted end higher other MULTI-PURPOSE STAND Field Repair broken tail boom normally spells end flying repairs possible back workbench Fig 5 shows fuselage cradle two adjusta ble stands helping make tail-boom re pair built-up tail boom Note ends tail boom have quite aligned careful adjustment height angle stands allowed exact match before glucing pieces together same model first ing built tail boom supported tail-boom support Fig 3 stab held proper angle tilt wash-in left leading edge stab raised give slight twist aids tail boom hold proper stab tilt before stab glued tail boom Wing Bracing Fig 6 shows adjustable stands holding wing prior bracing first step bracing standard bracing jig assemble wing posts cabane Fig 7 Next support wing stands stands set low er wing will posts lower post/cabane assembly over wing plug support block Note socket spacing sup mWING SPAR POST TISSUE SOCKET WING CHORD Fig 7 I Fig 8 port block should exactly same motorstick Next raise wing carefully right height raising support bars Set measure washin/wash-out wing twist sure ex continued page 98 38 Model Aviation Fig 5 Field repairs easy wsn muse extra hands hold model Fig 3 Tail-boom stand steadies model dur ing bracing operation Fig 6 Wing bracing adjustable multi purpose stands see local hobby dealer o Stahl designa lkJ~ olmast 40 yeors ago 5__ ____________ OGA * los Earl StuNs famous RUBBER & CO2 WINNER AT THE 50th NATS Rondo Spds 58 WINGSPAN Send free brochure 4 FLYLINE MODELS 22 1/2 WINGSPAN 10643 ASHBY PL FAIRFAX VA 22030 RUBBER POWERED FLYING MODELS NEW Kits 28 IN SPAN \PORT$~ORTs475 uis ViN*Off Rite U 13 IN SPAN P-NUT KIT S349~ O ae*Wte~ 13 IN SPAN P-NUTKIT $34916 IN SPAN SPORT $349 Peck-Pefymers PO BOX 2498-AMA Continued page 97 light sanding cover chromecoat Using rubber cement adhesive coat both paper wing core being sure its dry before proceeding covering Lay bottom wing surface chromecoat sup ported flat surface roll wing around leading edge back across top wing surface Take care twist warps wing wing panels now ready joining Sand bevel butts attain required 4 dihedral under tip Join 5-minute epoxy cover joint 4-in wide fiberglass cloth ad hered thinned epoxy Epoxy tip blocks place Sand fill wing ready finish wish use foam core covered balsa may omit spar trailing edge desire built-up wing cut ribs shape stacking seventeen 3/32 balsa rib blanks between root- tip-rib tem plates carve sand shape Lay down leading trailing edges plan add bottom leading edge sheet fit bot tom cap strips Glue bottom spar sheet ing add ribs dry add top spar remove plan Build remaining wing stage join proper di hedral Reinforce spar joints 3/32in dihedral brace cut fit behind spars Fit top leading edge sheeting cap strips sheet center section Glue wing tip blocks place sand completed wing PEANUT SCALE KITS PIETENPOL$329 MILES$329 TURBULENT$329 PIPER J3 CUB$329 ANDREASON$349 COUGAR $349 MUSTANG$349 ZERO-$349 SPORT MODEL KITS STRINGLESS WONDER$249 PECK ROG .$139 KITS 0 PLANS 0 ACCESSORIES CO-2 ENGINES SNARK & BROWN REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 5O MANY NARD TO FIND ITEMS LA MESA CALIF 92041 PNONE 714 469-8675 714 442-4636 final shape Built-up wings cap strips satis factory flying site free weeds other sharp objects rugged wing fully sheeted variety con struction procedure basically same except cap strips replaced sheet balsa Make up wing skins ad vance construction Sheet balsa straight enough join edge edge out first trimming trim overlap edges joined straightedge down center overlap run along straightedge sharp knife razor blade thus trimming both edges once Any irregularities trimming will correspond sheet matched resulting custom fit Lay down piece Saran Wrap fit edges sheet together holding securely join Zap equivalent An alternate method gluing join sheets masking tape flat Pick up taped sheets fold open joint apply balsa cement Lay sheets back bench tape side down secure until dry Re move tape sand outside surface absolute ultimate strength cover sheeted wing -oz fiberglass cloth adhered Hobby Poxy Formula II thinned 100% methanol brushed through cloth Finish Mountaineer favorite materials As late have using thinned out Hobby Poxy Stuff filling grain dis count-store spray-can enamel color paints dry quickly look great besides costing very little After finishing components reinstall radio hook up controls check trav el check assembled model proper balance noted plans Ballast neces sary little nose heavy OK tail heavy model disastrous Flying Prior launching slope test glide model over level ground deter neutral control settings satis factory model should glide straight no stall diving tendencies Adjust pushrods accordingly have flown hill fore would offer basic comments Launch directly wind angle slope prepared apply slight down elevator avoid stall slopers tend ballon launch get familiar flight characteristics Mountaineer fly figure-eight pattern 100-feet out making turns away hill Let model drift toward slope crosses front prior turning wind next leg flying back toward down wind keep mind ground speed will sum normal flying speed plus wind normal tendency slow model apparent speed going wind normal speed less wind speed can produce unexpected stall hillside landings choice suggest landing low cross-slope pass nose model quartered wind feeding down eleva tor Dont forget hot coffee gets chilly out hill FF Indoor/Tenny continued page 38 actly correct Stand back visually spect wing alignment glue wing posts cabane Fig 8 shows wing should appear note stands just outside dihedral joints primary bracing wires can attached before moving anything Finally Fig 9 Fig 9 shows stands supporting tips dihedral joints glued dotted lines show secondary bracing used Have Stands Will Travel now apparent flat surface con98 Model Aviation 24 lIZ WINGSPAN 5 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAX test enables model set up re paired and/or re-aligned using exactly same fixtures built sur face Fig 5 model carrying box Since base fixture wide balsa strip pins work well building board home masking tape ideal contest Plan Ahead limitation Ive found own version devices de scribed future shock couldnt envision would ever need 7/2 wing chord wires adjustable stands 7 apart Oops Bud Tenny Box 545 Richardson TX 75080 FF Old-Timers/Haught continued page 39 right cabin left Some cabin ships will climb right just well would recommend left safe side Power turn usually induced engine side-thrust subject thrust adjustments old-timers need downthrust rarely called out plan About 2 degrees good starting point should now ready flight tests Hand glide ship wind check diving stalling tendencies Correct changing incidence either wing stab prefer make adjust ments stabilizer because changing wing incidence effectively changes thrust line Also turning tendencies should observed Due limited duration hand glide slight turn should apparent Begin power tests 5-second engine run shorter run will tell enough longer may prove disas trous trim far off engine should adjusted reasonable amount thrust Extremely low power wont really tell anything could lead stall As soon possible increase power normal models behave consider ably different power increases trim ming done low power will have re done anyhow Gradually lengthen engine run ob serving flight pattern Adjust climb pat tern thrust and/or incidence adjust ments Make adjustment time Dont worry too much about glide trim long its safe stage Once power pattern good can correct glide speed small shifts center gravity addition ballast Glide turn can also induced adding short approximately 6 piece Vi X 1 tapered trailing edge stock bot tom trailing edge inboard wing thin edge forward Some modelers prefer hinged drag flap purpose experience nil Ill mis direct score Transition power glide influ enced power turn having trouble transitions try tighter pow er turn will reduce effective cidence may have increase maintain climb angle Looping tenden cies can corrected down-thrust power turn Think out problem observe things arent going too well pack up go home can devote unpressured thought prob lem Never rush flight trimming proce dures Fuel Tests mail indicates testing various fuels improved serv ice life better power Phil Mahony Lime Rock CT has experimenting Castrol R-40 Phil claims less heat oil uses Amoco high-test no-lead gasoline Phil didnt indicate mixing ratio 3 1 would good start Mark Fechner oit Salt Lake way has run some interesting tests using O&R 19 side-port engine Y&O 10-4 prop using various oils combustibles always comparing back good old SAE 70 oil accompanying chart shows results Marks tests Mark accomplished engine conversion spe cialist plan obtain Marks Continued page 100 June 1977 99