SINCE YOU will receiving just after Christmas following slightly edited contribution Plane Prop Wash newsletter Syracuse Thunderbirds Aero Radio Society should very appro priate Dear Mr Modeler received letter found bit confusing times did best hope ye made happy Spinners unavailable have sent small local group Monokote mystery us sent mohair coat instead didnt send Monokote iron because coat can dry cleaned Hope size 20 alright Super Shoe course sent two didnt have green Solarfilm did have Kodachrome II color film sent largest Super Chip munk available have included cage although realize didnt request Kwik Link entitles free call hot line certificate enclosed However regarding request Hot Stuff line Merry Christ mas S Claus Last month promised discuss rig ailerons discussion will cover based pattern flying philosophy however pattern fliers will agree basic principles should never have aileron throw required full stick deflec tion causes too much aileron throw ailerons will probably overly sensitive about neutral make difficult trim airplane roll generally rig aileron throw ob tain three rolls five seconds full stick deflection addition adjust low rate aileron give roll five seconds doing slow rolls way can hold full stick control both maneuvers worry about doing proper time concept aileron differential ailerons move up move down often poorly understood some experienced pattern fliers just know airplane rolls much axially aileron differential will attempt describe what happens ailerons deflected concept will better understood easily implemented Deflection ailerons usually alters both lift drag distributions across wing modified lift distribution causes net rolling moment changed drag distribution causes net yawing moment aileron system rigged ailerons move up same amount move down wing will tend roll about axis dis placed center fuselage airplane will yaw rolling situation makes corkscrewing generally sloppy roll Conversely aileron system proper differential will cause air plane roll about fuselage axis no yawing tendency reason aileron differential works downward moving aileron effective changing both lift drag Sport-Aerobatics upwardmoving aileron example suppose ailerons deflected equal amount clockwise roll viewed behind airplane ie airplane will tend roll right means left aileron moves down right aileron moves up left aileron will cause increase both lift drag left wing right aileron will cause decrease lift increase drag right wing effect lift changes will re Ron Van Putte suit clockwise rolling moment Since downward moving left aileron causes larger drag increase upward moving right aileron effect drag changes will nose-left yawing moment So have airplane rolling right yawing left same time combination two motions makes resulting rolls look bad Aileron differential used adjust drag changes wing moving ailerons causes little no yawing moment generated because aileron motion less importance factor also improves rolling motion lift changes side wing will out Consequently airplane will tend roll about axis closer fuselage centerline com bination both effects substantially improve appearance axial rolls trick comes determining much aile continued page 78 February 1977 17 0 0 0 Above Suellen Burnett holds hubby Burnetts Phoenix 6 starts ST Bluehead engine Right Checking out servo travel after re ceiver switch Hervey Woods topl Mike Wingo Both flew same airplane Crescent City Fall Carnival different mode X mittersand hence need switch Below Rains drowned Eastern States RC ChampionshipsGeorge Miller running shelter after completing very wet flight AEMEN PRESENT 2~Eotea Hand GlideDurable Solid Sproce -7 & Baka Construceioo 17 WingSpan $249 Hand GliderExtra cab Solid Sproce & Balsa - Construction 18 WingSpan $249 Hand Glider Solid Syroce & Balsa Construction 11 Win5 Sparc -Ideal Beginner Competition Model $198 FF Indoor/Tenny continued page 46 flight torque changeover torque Levelflight torque torque required fly model level changeover torque minimum torque will make propeller continue pull model model still airborne motor unwinds changeover torque model immediately starts come down faster What happens prop continues turn model now pushing prop instead being pulled prop What Does Mean Fig 2 shows unwinding curves thick heavy motor upper curve thinner motor Launch torque level flight torque marked two horizontal lines show effect two very differ ent motors flight model two flights same model motor will released same launch torque level flight torque sumed same both flights heavy motor note much longer takes turns flight time motor unwind level flight torque means model will climb much longer thicker motor look what happens total unwinding time heavy motor over half gone model will probably run out turns before touchdown other curve climb time shorter time left unwinding level-flight torque occurs start linear part curve choice motor will result longer flight since model will come down slowly during time between level-flight torque changeover torque Hand GliderDo able Balsa Constroct 19 WegSpan $249 0 nd GliderDurable Balsa Construction -18 WingSpan $249 Kite teebde ipd ,5eblank&pm5pa isde ,dd & ensue, Aero Modeling Enterprises 2215 So Air Depot Bind MidwestCity OkIa 73110 Dealer Inquiries Invited See hobby dealer firull Winding Technique Important un winding curves shown Fig 1 Fig 2 typical what happens flying field winding curve Fig 1 idealized shape hap pens real life Actually Fig 1 wind ing curve traced machine-wound test unstretched wound nearly break point An experienced flier winds some variations scheme motor stretched out between four six times normal length turns added fairly slowly torque meter reading watched carefullynot ab solute values trend torque begins rise rapidly addition few turns 5he amount stretch reduced reduced tension allows some motor knots double up indicated torque drops some point fliers allow motor rest little massage knots work out local lumps wound motor Winding continues followed further reduction stretch massage motor fully wound torque level should high steady Launch Torque Now motor fully wound torque probably higher desired launch torque Since usually necessary let out few turns allow motor slip off winder hook motor prop re-check torque torque meter has un winding feature easy let off enough turns reach desired launch torque Otherwise necessary hook motor model let prop run until torque feels right Wind Less such problem getting fully wound desired launch torque wind motor enough get right torque Im glad asked Winding motor way has certain benefits First winding technique mentioned above motor consistently wound time likely react previous flights Second winding way unwinding desired torque motor will have up 15% turns simply wound launch torque launched fliers have prob lems making consistent flights proper winding technique can overcome problems since torque rather number turns given motor determines high model climbs safer use torque stead turns Bud Tenny Box 545 Richardson TX 75080 RC Sport/Van Putte continued page 17 ron differential required ar range linkages obtain Unfortu nately best method trial-and-error have patience can get just right wrong aileron differen tial better Figs 1 2 show two ways obtain aileron differential low-wing airplanes Since virtually pattern airplanes have low wings sport fliers highwing airplanes arent really concerned perfect axial rolls shouldnt cause problems course can combine both techniques provide differential possible using either technique itself Try very easy works reminds construction tech nique just discovered would like share Like modelers often use vinyl spackling basic construction repair jobs Spackling great use cause fills small holes well easy sand easy sand because soft relatively porous both char acteristics can problems paint over because paint absorbed spackling finish duller adjacent areas After sanding down spackled area give shot Hot Stuff Zap other light sanding paint goes much uniformly TA C Times newsletter Temple Texas Aero Modelers Model Airplane Club edited Dan Amburn comes gem worth sharing Happiness Finding out new next door neigh bor Jersey Jim Martin landing ten sec onds before receiver battery dies finding out loud crunch heard backing car out pit area rotten board accidentally flying through tree touching limb cleaning plane suddenly 78 Model Aviation discover made through day minus elevator servo output arm screw club members submitted article newsletter Recently purchased two Fox motor mounts 60-size engines discovered backs convex beams about 20 upthrust Since have gen erally very satisfied Fox prod ucts especially motor mounts wrote Duke Fox sent mount spection reply follows Dear Ron Fox motor mounts cut extrusion both back wall motor mount surface surfaces formed extrusion itself pricing products allow machine tooling surfaces Most people very happy standard extrusion tolerances suitable purposes am sure can take mount machine shop few dollars can have take touring cut across two surfaces will give what want still considerable less cost other method can get Yours truly Duke Fox Rather take mount ma chinist since dont know chose file surface myself able make mount suitable use An FCC Class C license nothing answer yes youve just bought iiAS INC DIFFERENTIAL about buy Kraft system dealer supplied Alamo Hobby Distributors San Antonio Tex have to give dealer ad dress serial number radio system Alamo makes out check FCC sends dealer turn gives enclosed license application Alamo Hobby Distributors has urged dealers encourage customers take advantage offer cov ered club licensebecause urgent need boost individual Class C licensee registration FCC order protect frequencies possibly ob tain additional ones offer expires March 31 1977 Ron Van Puue 12 Connie Dr Shah mar FL 32579 FIG 2 INCREASING DIFFERENTIAL ,1 fl zzmz February 1977 79 FIG 1
Edition: Model Aviation - 1977/02
Page Numbers: 17, 78, 79
SINCE YOU will receiving just after Christmas following slightly edited contribution Plane Prop Wash newsletter Syracuse Thunderbirds Aero Radio Society should very appro priate Dear Mr Modeler received letter found bit confusing times did best hope ye made happy Spinners unavailable have sent small local group Monokote mystery us sent mohair coat instead didnt send Monokote iron because coat can dry cleaned Hope size 20 alright Super Shoe course sent two didnt have green Solarfilm did have Kodachrome II color film sent largest Super Chip munk available have included cage although realize didnt request Kwik Link entitles free call hot line certificate enclosed However regarding request Hot Stuff line Merry Christ mas S Claus Last month promised discuss rig ailerons discussion will cover based pattern flying philosophy however pattern fliers will agree basic principles should never have aileron throw required full stick deflec tion causes too much aileron throw ailerons will probably overly sensitive about neutral make difficult trim airplane roll generally rig aileron throw ob tain three rolls five seconds full stick deflection addition adjust low rate aileron give roll five seconds doing slow rolls way can hold full stick control both maneuvers worry about doing proper time concept aileron differential ailerons move up move down often poorly understood some experienced pattern fliers just know airplane rolls much axially aileron differential will attempt describe what happens ailerons deflected concept will better understood easily implemented Deflection ailerons usually alters both lift drag distributions across wing modified lift distribution causes net rolling moment changed drag distribution causes net yawing moment aileron system rigged ailerons move up same amount move down wing will tend roll about axis dis placed center fuselage airplane will yaw rolling situation makes corkscrewing generally sloppy roll Conversely aileron system proper differential will cause air plane roll about fuselage axis no yawing tendency reason aileron differential works downward moving aileron effective changing both lift drag Sport-Aerobatics upwardmoving aileron example suppose ailerons deflected equal amount clockwise roll viewed behind airplane ie airplane will tend roll right means left aileron moves down right aileron moves up left aileron will cause increase both lift drag left wing right aileron will cause decrease lift increase drag right wing effect lift changes will re Ron Van Putte suit clockwise rolling moment Since downward moving left aileron causes larger drag increase upward moving right aileron effect drag changes will nose-left yawing moment So have airplane rolling right yawing left same time combination two motions makes resulting rolls look bad Aileron differential used adjust drag changes wing moving ailerons causes little no yawing moment generated because aileron motion less importance factor also improves rolling motion lift changes side wing will out Consequently airplane will tend roll about axis closer fuselage centerline com bination both effects substantially improve appearance axial rolls trick comes determining much aile continued page 78 February 1977 17 0 0 0 Above Suellen Burnett holds hubby Burnetts Phoenix 6 starts ST Bluehead engine Right Checking out servo travel after re ceiver switch Hervey Woods topl Mike Wingo Both flew same airplane Crescent City Fall Carnival different mode X mittersand hence need switch Below Rains drowned Eastern States RC ChampionshipsGeorge Miller running shelter after completing very wet flight AEMEN PRESENT 2~Eotea Hand GlideDurable Solid Sproce -7 & Baka Construceioo 17 WingSpan $249 Hand GliderExtra cab Solid Sproce & Balsa - Construction 18 WingSpan $249 Hand Glider Solid Syroce & Balsa Construction 11 Win5 Sparc -Ideal Beginner Competition Model $198 FF Indoor/Tenny continued page 46 flight torque changeover torque Levelflight torque torque required fly model level changeover torque minimum torque will make propeller continue pull model model still airborne motor unwinds changeover torque model immediately starts come down faster What happens prop continues turn model now pushing prop instead being pulled prop What Does Mean Fig 2 shows unwinding curves thick heavy motor upper curve thinner motor Launch torque level flight torque marked two horizontal lines show effect two very differ ent motors flight model two flights same model motor will released same launch torque level flight torque sumed same both flights heavy motor note much longer takes turns flight time motor unwind level flight torque means model will climb much longer thicker motor look what happens total unwinding time heavy motor over half gone model will probably run out turns before touchdown other curve climb time shorter time left unwinding level-flight torque occurs start linear part curve choice motor will result longer flight since model will come down slowly during time between level-flight torque changeover torque Hand GliderDo able Balsa Constroct 19 WegSpan $249 0 nd GliderDurable Balsa Construction -18 WingSpan $249 Kite teebde ipd ,5eblank&pm5pa isde ,dd & ensue, Aero Modeling Enterprises 2215 So Air Depot Bind MidwestCity OkIa 73110 Dealer Inquiries Invited See hobby dealer firull Winding Technique Important un winding curves shown Fig 1 Fig 2 typical what happens flying field winding curve Fig 1 idealized shape hap pens real life Actually Fig 1 wind ing curve traced machine-wound test unstretched wound nearly break point An experienced flier winds some variations scheme motor stretched out between four six times normal length turns added fairly slowly torque meter reading watched carefullynot ab solute values trend torque begins rise rapidly addition few turns 5he amount stretch reduced reduced tension allows some motor knots double up indicated torque drops some point fliers allow motor rest little massage knots work out local lumps wound motor Winding continues followed further reduction stretch massage motor fully wound torque level should high steady Launch Torque Now motor fully wound torque probably higher desired launch torque Since usually necessary let out few turns allow motor slip off winder hook motor prop re-check torque torque meter has un winding feature easy let off enough turns reach desired launch torque Otherwise necessary hook motor model let prop run until torque feels right Wind Less such problem getting fully wound desired launch torque wind motor enough get right torque Im glad asked Winding motor way has certain benefits First winding technique mentioned above motor consistently wound time likely react previous flights Second winding way unwinding desired torque motor will have up 15% turns simply wound launch torque launched fliers have prob lems making consistent flights proper winding technique can overcome problems since torque rather number turns given motor determines high model climbs safer use torque stead turns Bud Tenny Box 545 Richardson TX 75080 RC Sport/Van Putte continued page 17 ron differential required ar range linkages obtain Unfortu nately best method trial-and-error have patience can get just right wrong aileron differen tial better Figs 1 2 show two ways obtain aileron differential low-wing airplanes Since virtually pattern airplanes have low wings sport fliers highwing airplanes arent really concerned perfect axial rolls shouldnt cause problems course can combine both techniques provide differential possible using either technique itself Try very easy works reminds construction tech nique just discovered would like share Like modelers often use vinyl spackling basic construction repair jobs Spackling great use cause fills small holes well easy sand easy sand because soft relatively porous both char acteristics can problems paint over because paint absorbed spackling finish duller adjacent areas After sanding down spackled area give shot Hot Stuff Zap other light sanding paint goes much uniformly TA C Times newsletter Temple Texas Aero Modelers Model Airplane Club edited Dan Amburn comes gem worth sharing Happiness Finding out new next door neigh bor Jersey Jim Martin landing ten sec onds before receiver battery dies finding out loud crunch heard backing car out pit area rotten board accidentally flying through tree touching limb cleaning plane suddenly 78 Model Aviation discover made through day minus elevator servo output arm screw club members submitted article newsletter Recently purchased two Fox motor mounts 60-size engines discovered backs convex beams about 20 upthrust Since have gen erally very satisfied Fox prod ucts especially motor mounts wrote Duke Fox sent mount spection reply follows Dear Ron Fox motor mounts cut extrusion both back wall motor mount surface surfaces formed extrusion itself pricing products allow machine tooling surfaces Most people very happy standard extrusion tolerances suitable purposes am sure can take mount machine shop few dollars can have take touring cut across two surfaces will give what want still considerable less cost other method can get Yours truly Duke Fox Rather take mount ma chinist since dont know chose file surface myself able make mount suitable use An FCC Class C license nothing answer yes youve just bought iiAS INC DIFFERENTIAL about buy Kraft system dealer supplied Alamo Hobby Distributors San Antonio Tex have to give dealer ad dress serial number radio system Alamo makes out check FCC sends dealer turn gives enclosed license application Alamo Hobby Distributors has urged dealers encourage customers take advantage offer cov ered club licensebecause urgent need boost individual Class C licensee registration FCC order protect frequencies possibly ob tain additional ones offer expires March 31 1977 Ron Van Puue 12 Connie Dr Shah mar FL 32579 FIG 2 INCREASING DIFFERENTIAL ,1 fl zzmz February 1977 79 FIG 1
Edition: Model Aviation - 1977/02
Page Numbers: 17, 78, 79
SINCE YOU will receiving just after Christmas following slightly edited contribution Plane Prop Wash newsletter Syracuse Thunderbirds Aero Radio Society should very appro priate Dear Mr Modeler received letter found bit confusing times did best hope ye made happy Spinners unavailable have sent small local group Monokote mystery us sent mohair coat instead didnt send Monokote iron because coat can dry cleaned Hope size 20 alright Super Shoe course sent two didnt have green Solarfilm did have Kodachrome II color film sent largest Super Chip munk available have included cage although realize didnt request Kwik Link entitles free call hot line certificate enclosed However regarding request Hot Stuff line Merry Christ mas S Claus Last month promised discuss rig ailerons discussion will cover based pattern flying philosophy however pattern fliers will agree basic principles should never have aileron throw required full stick deflec tion causes too much aileron throw ailerons will probably overly sensitive about neutral make difficult trim airplane roll generally rig aileron throw ob tain three rolls five seconds full stick deflection addition adjust low rate aileron give roll five seconds doing slow rolls way can hold full stick control both maneuvers worry about doing proper time concept aileron differential ailerons move up move down often poorly understood some experienced pattern fliers just know airplane rolls much axially aileron differential will attempt describe what happens ailerons deflected concept will better understood easily implemented Deflection ailerons usually alters both lift drag distributions across wing modified lift distribution causes net rolling moment changed drag distribution causes net yawing moment aileron system rigged ailerons move up same amount move down wing will tend roll about axis dis placed center fuselage airplane will yaw rolling situation makes corkscrewing generally sloppy roll Conversely aileron system proper differential will cause air plane roll about fuselage axis no yawing tendency reason aileron differential works downward moving aileron effective changing both lift drag Sport-Aerobatics upwardmoving aileron example suppose ailerons deflected equal amount clockwise roll viewed behind airplane ie airplane will tend roll right means left aileron moves down right aileron moves up left aileron will cause increase both lift drag left wing right aileron will cause decrease lift increase drag right wing effect lift changes will re Ron Van Putte suit clockwise rolling moment Since downward moving left aileron causes larger drag increase upward moving right aileron effect drag changes will nose-left yawing moment So have airplane rolling right yawing left same time combination two motions makes resulting rolls look bad Aileron differential used adjust drag changes wing moving ailerons causes little no yawing moment generated because aileron motion less importance factor also improves rolling motion lift changes side wing will out Consequently airplane will tend roll about axis closer fuselage centerline com bination both effects substantially improve appearance axial rolls trick comes determining much aile continued page 78 February 1977 17 0 0 0 Above Suellen Burnett holds hubby Burnetts Phoenix 6 starts ST Bluehead engine Right Checking out servo travel after re ceiver switch Hervey Woods topl Mike Wingo Both flew same airplane Crescent City Fall Carnival different mode X mittersand hence need switch Below Rains drowned Eastern States RC ChampionshipsGeorge Miller running shelter after completing very wet flight AEMEN PRESENT 2~Eotea Hand GlideDurable Solid Sproce -7 & Baka Construceioo 17 WingSpan $249 Hand GliderExtra cab Solid Sproce & Balsa - Construction 18 WingSpan $249 Hand Glider Solid Syroce & Balsa Construction 11 Win5 Sparc -Ideal Beginner Competition Model $198 FF Indoor/Tenny continued page 46 flight torque changeover torque Levelflight torque torque required fly model level changeover torque minimum torque will make propeller continue pull model model still airborne motor unwinds changeover torque model immediately starts come down faster What happens prop continues turn model now pushing prop instead being pulled prop What Does Mean Fig 2 shows unwinding curves thick heavy motor upper curve thinner motor Launch torque level flight torque marked two horizontal lines show effect two very differ ent motors flight model two flights same model motor will released same launch torque level flight torque sumed same both flights heavy motor note much longer takes turns flight time motor unwind level flight torque means model will climb much longer thicker motor look what happens total unwinding time heavy motor over half gone model will probably run out turns before touchdown other curve climb time shorter time left unwinding level-flight torque occurs start linear part curve choice motor will result longer flight since model will come down slowly during time between level-flight torque changeover torque Hand GliderDo able Balsa Constroct 19 WegSpan $249 0 nd GliderDurable Balsa Construction -18 WingSpan $249 Kite teebde ipd ,5eblank&pm5pa isde ,dd & ensue, Aero Modeling Enterprises 2215 So Air Depot Bind MidwestCity OkIa 73110 Dealer Inquiries Invited See hobby dealer firull Winding Technique Important un winding curves shown Fig 1 Fig 2 typical what happens flying field winding curve Fig 1 idealized shape hap pens real life Actually Fig 1 wind ing curve traced machine-wound test unstretched wound nearly break point An experienced flier winds some variations scheme motor stretched out between four six times normal length turns added fairly slowly torque meter reading watched carefullynot ab solute values trend torque begins rise rapidly addition few turns 5he amount stretch reduced reduced tension allows some motor knots double up indicated torque drops some point fliers allow motor rest little massage knots work out local lumps wound motor Winding continues followed further reduction stretch massage motor fully wound torque level should high steady Launch Torque Now motor fully wound torque probably higher desired launch torque Since usually necessary let out few turns allow motor slip off winder hook motor prop re-check torque torque meter has un winding feature easy let off enough turns reach desired launch torque Otherwise necessary hook motor model let prop run until torque feels right Wind Less such problem getting fully wound desired launch torque wind motor enough get right torque Im glad asked Winding motor way has certain benefits First winding technique mentioned above motor consistently wound time likely react previous flights Second winding way unwinding desired torque motor will have up 15% turns simply wound launch torque launched fliers have prob lems making consistent flights proper winding technique can overcome problems since torque rather number turns given motor determines high model climbs safer use torque stead turns Bud Tenny Box 545 Richardson TX 75080 RC Sport/Van Putte continued page 17 ron differential required ar range linkages obtain Unfortu nately best method trial-and-error have patience can get just right wrong aileron differen tial better Figs 1 2 show two ways obtain aileron differential low-wing airplanes Since virtually pattern airplanes have low wings sport fliers highwing airplanes arent really concerned perfect axial rolls shouldnt cause problems course can combine both techniques provide differential possible using either technique itself Try very easy works reminds construction tech nique just discovered would like share Like modelers often use vinyl spackling basic construction repair jobs Spackling great use cause fills small holes well easy sand easy sand because soft relatively porous both char acteristics can problems paint over because paint absorbed spackling finish duller adjacent areas After sanding down spackled area give shot Hot Stuff Zap other light sanding paint goes much uniformly TA C Times newsletter Temple Texas Aero Modelers Model Airplane Club edited Dan Amburn comes gem worth sharing Happiness Finding out new next door neigh bor Jersey Jim Martin landing ten sec onds before receiver battery dies finding out loud crunch heard backing car out pit area rotten board accidentally flying through tree touching limb cleaning plane suddenly 78 Model Aviation discover made through day minus elevator servo output arm screw club members submitted article newsletter Recently purchased two Fox motor mounts 60-size engines discovered backs convex beams about 20 upthrust Since have gen erally very satisfied Fox prod ucts especially motor mounts wrote Duke Fox sent mount spection reply follows Dear Ron Fox motor mounts cut extrusion both back wall motor mount surface surfaces formed extrusion itself pricing products allow machine tooling surfaces Most people very happy standard extrusion tolerances suitable purposes am sure can take mount machine shop few dollars can have take touring cut across two surfaces will give what want still considerable less cost other method can get Yours truly Duke Fox Rather take mount ma chinist since dont know chose file surface myself able make mount suitable use An FCC Class C license nothing answer yes youve just bought iiAS INC DIFFERENTIAL about buy Kraft system dealer supplied Alamo Hobby Distributors San Antonio Tex have to give dealer ad dress serial number radio system Alamo makes out check FCC sends dealer turn gives enclosed license application Alamo Hobby Distributors has urged dealers encourage customers take advantage offer cov ered club licensebecause urgent need boost individual Class C licensee registration FCC order protect frequencies possibly ob tain additional ones offer expires March 31 1977 Ron Van Puue 12 Connie Dr Shah mar FL 32579 FIG 2 INCREASING DIFFERENTIAL ,1 fl zzmz February 1977 79 FIG 1