Scale YOU SAY YOU ARE having heat prob lems new super scale job Dont feel badly Im sure have plenty company us have prob lem First off flying heavier models cases should using larger diameter props way have found scale jobs exception very large biplane say radialengined craftsuch Hellcata 12/6 prop will fly model much better pattern prop range 11/7 11/8 course get prop blades out side cowling larger models need 13- 14-in propbut keep pitch lower Never install new engine scale bird Have well broken pos sible first fly scale engine pattern sport model get well broken idle set Also fly prop will use scale model Im sure have seen contests several fine scale birds seemed under-powered cases engines broken propped incor rectly poor tank set-up etc common scale biplanes Scale biplanes inherently tail-heavy have drag need pulling power can get has proved cowled engine needs air outlet about 75% larger intake because super-heated air cowl expands must get out away head talking about air intake around engine head say about two square inches rest cowling opening doesnt matter heid needs air flowing over around Look Formula ets need small slot directly front engine head outlet much larger usually has air direc tion trough channel air out rear cowl also should done scale models because hot air can build up around firewall engine head causing pressure area back head will run hot until engine stops outlet air exhausted bottom cowl often done engine upright channeling hot air should directed outlet bottom cowl can easily Bud Akinson done making trough thin ply wood tincan stock Support deflec tor about inch back head Also sure exhaust properly di rected out cowl Now AMA rules require muffler scale models have another potential heat problem spend some time selecting muffler cool-run ning engine reliable idle must scale modelsoff-field landings rather hard heavy scale ships particu larly detailed landing gears re tracts thing consider next scale subject fiberglass cowlingunless has glass fuselage glass cowl cases will give room air circulate fuel-proof Also en gine will run cooler because glass will dis sipate heat much easily Open ings such air intake exhaust holes stronger easier make glass case nose-over glass cowl will withstand impact much better little paint skinned off whereas wood plastic cowl will sustain much damage important quality glass cowl much cooler enables engine run scale people Nats dis cussed subject has long over due discussion circulated whenever several scale modelers gathered together agreed air other scale column writers possibility RC National Scale Advisory Board whatever may want call would function much thesame NMPRA racing group National Society Radio Control Aerobatics Stand-Off Scale growing fast interest continued page 94 Left Red white blue Shrike Commander 6iiiy Fryman waits judges turntable Mint Julep meet Power two 05 Max 60s December 1976 17 Top Superb rendition Japanese Army Type 95 Spruce WW II trainer John Eli has wing area 1000 sq plusProfi 76 Above Gerard Davits P-510first Mint Julep retracts flaps bomb drop fired rockets RUBBER POWERED NEW AII7FLYING MODELS 28 IN SPAN IktGI\SPORT $475 U/PS MOTIf, NIt 2 13 IN SPAN P-NUT KIT $349 N/tel 13 IN SPAN P-NUTKIT $34916 IN SPAN SPORT $349 0 BOX 2498-AMA Fike Peanut/Dunham continued page 47 1/16 strips around cardboard form baking oven 2000F about 10 minutes Remove separate strips apply thin coating glue inside surfaces re-wrap form allow dry n should con structed termini points going past actual stop allow room trim exact length secret forming strips type keep constant tension never allow strip go slack kink will surely occur Both rudder elevator surfaces covered light Japanese tissue alcohol shrunk given coat very thin nitrate dope surface outline strips cut black tissue applied acetone Assemble fuselage light glue tack since flying adjustments may make necessary remove later change incidence add rudder turn Wing first step building wing construct upper camber airfoil template thin ply aluminum sheet Next cut about 20 sliced upper ribs 1/20 sheet provides few spares breakage during construction two spars also cut 1/20 sheet using metal straightedge keep spars curling make several shallow razor passes along straightedge instead trying pass trailing edge piece first tapered still sheet form 3/16 wide strip removed sheet using straightedge same cutting technique used spars leading trailing edges pinned over plan 1/20 square lower surface ribs glued place two spars positioned place small dab glue rib Wait dry thoroughly upper camber ribs trimmed length cutting excess rear portion glued leading trailing edges well two spars tip ribs solid sheet leading edge shaped sanded remove bumps irregularities 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 SHARK & BROWN REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS LA MESA CALIF 92041 PHONE 714 469-8675 714 442-4636 Covering material again light Japanese tissue alcohol shrunk given coat nitrate dope Aileron outlines black tissue strips attached brushing acetone wing attached fuselage being careful square up alignment both front top views want lighter wing might try reducing number ribs wing 15 9 plus end ribs could amount 4-5 second duration increase indoor ship worth trouble outdoors Prop Peanut props always problem unfortunately lot well constructed models attain full potential because poorly made improperly pitched propeller plan will find two types props choose simplest constructed forming blades froxti thin sheet balsa attaching central hub method use blade shape shown cut two identical blades 1/32 sheet soaked water few minutes soften wood fibers Stack together conform contour soft drink can masking tape approximately 200 angle vertical Place oven bake 200 0F 10 minutes common double pointed tooth pick makes suitable hub 1/32 music wire shaft glued center Make small cutout blade match tip glue such angle viewed end portion nearest hub about 450 angle Remember better have blades pitched too low too high first guess wrong plane flying too slowly try softening glue acetone resetting pitch lower angle Another common fault having blades unevenly pitched symptom wobbly flight pattern lots vibration alternate prop ex perienced builder made carv ing block using layout shown carve under camber first both blades top camber fol lowed thinning blades suit sight feel paddle blade shape best peanuts since diameter limited generous blade desirable Sand smooth give two coats clear dope Flying Adjusting flying little ship easiest have experienced almost flew off board lack wing dihedral does seem cause serious flying adjusting problems either indoors moderate winds outside feel comfortable dihedral crack no 1/4 under panel either side cabin area example flies like rails does suffer instability prefer adjust rubber ships righthand pattern same will probably need some right-thrust bit right-rudder Start power flights about 600 turns applied geared winder progressing higher turns successful flights made winding above 1000 turns suggest employ winding tube protect against breakage winding tube lot easier build fuselage word wise sufficient Typical indoor times neigh borhood 60 75 seconds will vary greatly outdoors depending adept picking good air have problems kind peanut want tell well flew can write P 0 Box 7151 Tulsa OK 74105 RC Scale/Atkinson continued page 17 warrants better communication among scale modelers Helicopter people have world-wide organization National Radio Control Helicopter Assoc pur pose does International Miniature Aerobatics Club Stand-Off Scale has reached level justifies dividing several catego riessuch WW WW II WW II aircraft becoming very popular several noteworthy contests emerg ingsuch Morgan Hill WW II Scramble course scale association would take lot work time since other groups within RC have done Scale RCM nucleus Helicopter Assoc have printed copter news association may way go scale hope magazine editors take good long look possibilities Scale oldest events RC last orga nize special interest group So lets hear scale bugs let other scale columnists hear too does MSAAMiniature Scale Air craft Assoc grab ya Bud Atkinson 734 N 6th Street Ter race Blue Springs MO 64015 94 Model Aviation
Edition: Model Aviation - 1976/12
Page Numbers: 17, 94
Scale YOU SAY YOU ARE having heat prob lems new super scale job Dont feel badly Im sure have plenty company us have prob lem First off flying heavier models cases should using larger diameter props way have found scale jobs exception very large biplane say radialengined craftsuch Hellcata 12/6 prop will fly model much better pattern prop range 11/7 11/8 course get prop blades out side cowling larger models need 13- 14-in propbut keep pitch lower Never install new engine scale bird Have well broken pos sible first fly scale engine pattern sport model get well broken idle set Also fly prop will use scale model Im sure have seen contests several fine scale birds seemed under-powered cases engines broken propped incor rectly poor tank set-up etc common scale biplanes Scale biplanes inherently tail-heavy have drag need pulling power can get has proved cowled engine needs air outlet about 75% larger intake because super-heated air cowl expands must get out away head talking about air intake around engine head say about two square inches rest cowling opening doesnt matter heid needs air flowing over around Look Formula ets need small slot directly front engine head outlet much larger usually has air direc tion trough channel air out rear cowl also should done scale models because hot air can build up around firewall engine head causing pressure area back head will run hot until engine stops outlet air exhausted bottom cowl often done engine upright channeling hot air should directed outlet bottom cowl can easily Bud Akinson done making trough thin ply wood tincan stock Support deflec tor about inch back head Also sure exhaust properly di rected out cowl Now AMA rules require muffler scale models have another potential heat problem spend some time selecting muffler cool-run ning engine reliable idle must scale modelsoff-field landings rather hard heavy scale ships particu larly detailed landing gears re tracts thing consider next scale subject fiberglass cowlingunless has glass fuselage glass cowl cases will give room air circulate fuel-proof Also en gine will run cooler because glass will dis sipate heat much easily Open ings such air intake exhaust holes stronger easier make glass case nose-over glass cowl will withstand impact much better little paint skinned off whereas wood plastic cowl will sustain much damage important quality glass cowl much cooler enables engine run scale people Nats dis cussed subject has long over due discussion circulated whenever several scale modelers gathered together agreed air other scale column writers possibility RC National Scale Advisory Board whatever may want call would function much thesame NMPRA racing group National Society Radio Control Aerobatics Stand-Off Scale growing fast interest continued page 94 Left Red white blue Shrike Commander 6iiiy Fryman waits judges turntable Mint Julep meet Power two 05 Max 60s December 1976 17 Top Superb rendition Japanese Army Type 95 Spruce WW II trainer John Eli has wing area 1000 sq plusProfi 76 Above Gerard Davits P-510first Mint Julep retracts flaps bomb drop fired rockets RUBBER POWERED NEW AII7FLYING MODELS 28 IN SPAN IktGI\SPORT $475 U/PS MOTIf, NIt 2 13 IN SPAN P-NUT KIT $349 N/tel 13 IN SPAN P-NUTKIT $34916 IN SPAN SPORT $349 0 BOX 2498-AMA Fike Peanut/Dunham continued page 47 1/16 strips around cardboard form baking oven 2000F about 10 minutes Remove separate strips apply thin coating glue inside surfaces re-wrap form allow dry n should con structed termini points going past actual stop allow room trim exact length secret forming strips type keep constant tension never allow strip go slack kink will surely occur Both rudder elevator surfaces covered light Japanese tissue alcohol shrunk given coat very thin nitrate dope surface outline strips cut black tissue applied acetone Assemble fuselage light glue tack since flying adjustments may make necessary remove later change incidence add rudder turn Wing first step building wing construct upper camber airfoil template thin ply aluminum sheet Next cut about 20 sliced upper ribs 1/20 sheet provides few spares breakage during construction two spars also cut 1/20 sheet using metal straightedge keep spars curling make several shallow razor passes along straightedge instead trying pass trailing edge piece first tapered still sheet form 3/16 wide strip removed sheet using straightedge same cutting technique used spars leading trailing edges pinned over plan 1/20 square lower surface ribs glued place two spars positioned place small dab glue rib Wait dry thoroughly upper camber ribs trimmed length cutting excess rear portion glued leading trailing edges well two spars tip ribs solid sheet leading edge shaped sanded remove bumps irregularities 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 SHARK & BROWN REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS LA MESA CALIF 92041 PHONE 714 469-8675 714 442-4636 Covering material again light Japanese tissue alcohol shrunk given coat nitrate dope Aileron outlines black tissue strips attached brushing acetone wing attached fuselage being careful square up alignment both front top views want lighter wing might try reducing number ribs wing 15 9 plus end ribs could amount 4-5 second duration increase indoor ship worth trouble outdoors Prop Peanut props always problem unfortunately lot well constructed models attain full potential because poorly made improperly pitched propeller plan will find two types props choose simplest constructed forming blades froxti thin sheet balsa attaching central hub method use blade shape shown cut two identical blades 1/32 sheet soaked water few minutes soften wood fibers Stack together conform contour soft drink can masking tape approximately 200 angle vertical Place oven bake 200 0F 10 minutes common double pointed tooth pick makes suitable hub 1/32 music wire shaft glued center Make small cutout blade match tip glue such angle viewed end portion nearest hub about 450 angle Remember better have blades pitched too low too high first guess wrong plane flying too slowly try softening glue acetone resetting pitch lower angle Another common fault having blades unevenly pitched symptom wobbly flight pattern lots vibration alternate prop ex perienced builder made carv ing block using layout shown carve under camber first both blades top camber fol lowed thinning blades suit sight feel paddle blade shape best peanuts since diameter limited generous blade desirable Sand smooth give two coats clear dope Flying Adjusting flying little ship easiest have experienced almost flew off board lack wing dihedral does seem cause serious flying adjusting problems either indoors moderate winds outside feel comfortable dihedral crack no 1/4 under panel either side cabin area example flies like rails does suffer instability prefer adjust rubber ships righthand pattern same will probably need some right-thrust bit right-rudder Start power flights about 600 turns applied geared winder progressing higher turns successful flights made winding above 1000 turns suggest employ winding tube protect against breakage winding tube lot easier build fuselage word wise sufficient Typical indoor times neigh borhood 60 75 seconds will vary greatly outdoors depending adept picking good air have problems kind peanut want tell well flew can write P 0 Box 7151 Tulsa OK 74105 RC Scale/Atkinson continued page 17 warrants better communication among scale modelers Helicopter people have world-wide organization National Radio Control Helicopter Assoc pur pose does International Miniature Aerobatics Club Stand-Off Scale has reached level justifies dividing several catego riessuch WW WW II WW II aircraft becoming very popular several noteworthy contests emerg ingsuch Morgan Hill WW II Scramble course scale association would take lot work time since other groups within RC have done Scale RCM nucleus Helicopter Assoc have printed copter news association may way go scale hope magazine editors take good long look possibilities Scale oldest events RC last orga nize special interest group So lets hear scale bugs let other scale columnists hear too does MSAAMiniature Scale Air craft Assoc grab ya Bud Atkinson 734 N 6th Street Ter race Blue Springs MO 64015 94 Model Aviation