Aerobahcs El Wynn Paul WHILE AT THE Nationals Califor nia writer chance talk stunt judge Bill Fitzgerald about balancing props Bill San Mateo California airline captain has borrowed technique real airplanes says full-size props balanced three-step fashion tracking dynamic horizontal position static vertical position states trying practice March AFB runways naturally nicked prop Bill volunteered bal ance could watch re port first step balancing according Bill select prop semi-bal anced comes out package De pending upon pocketbook chance sift through local hobby shops supply may may have opportunity pre-select props Assuming have will bal ance out fairly well conventional hand-held prop balancer proceed next step Bill has homemade gauge see photo check tracking prop tips shows hub faces parallel Basically attaches prop hub piece adjusts movable thumb screw just touch blade After ro tating prop 180 degrees can seen other blade touches point thumb screw doesnt cases probably wont very light sanding flat surface inside part prop hub order sug gests numbering blades making dont forget after taking prop off jig couple passes 320 sandpaper sufficient alter tracking Now prop tracking correctly next bit balancing fa miliar type two razor blades altered Austin-Craft balancer again see photos Make certain jig level before setting work Bill has three wood screws bottom base adjust used level top base Level jig both directions razor blades wonder what sort razor blades use full-size props type balancing us have performing years set prop horizontally see side drops side drops simply sand off some wood back side blade until prop stays horizontal balancer Sand back side blades because wood removed front side will destroy airfoil blade After operation Bill balances prop dynamically vertical position prop razor blades vertical position blade up down sees blade will drop side other After sand ing neither blade drops checks static balance again hori zontal position whole operation took about 30 minutes probably longer necessary since ask lot questions will say prop after three-phase balancing seemed very good job no vibration little time some ingenuity average stunt flier could construct two jigs needed balance props way Bill has balanced props Bob Gieseke Ted Fancher Gary McClellan course son David February 1 978 43 Custom Mufiler mounted Chuck Delano ST-46 airplane pictures Wynn Paul Continued page 100 Prop balancing jig made trom Austin-Craft bal ancer Bill Fitzgerald has two-edged blades Prop tracking gauge aluminum bar stock miscellaneous parts Bill Fitzgerald As Bob Harpe 46-size Dixon Stilares text relates accurate propeller tracking 57-in foam wing gross weight 58 oz essential full-scale maintenance CATALOG 25c DAVIS 22 D-IKPLAN 1 CSD-7BY Chas E Steinchak MODERNISTIC MODELS PO B0X6974ALBUQNM87107, KITS S 0 ACCESSORIES BABY ACEP-N UT KITS N BEARINGS BROWN CO-2 ENGINES RE AL JAPANESE TISSUE-PROPS I17 SPAN 4COMPLETE CATALOG 50q IKIT $425MANY HARD TO FIND ITEMS Pee*-haw BOX 2493LA MESA CALIF 92041 4720 Ashbrook Rd Dallas TX have turned 18011 18086 mph respectively stock ST X-15s except chromed liners new heads Dub will chrome fit liners about $18 David will other work Brent Bussell Dallas TX has turned 186 stock X-29 understand Nick Shear 815 Beech Rd Langhorne PA 19047 has done 188 Patrick Hempel holds Senior B record 19264 mph practically stock K&B 40 mini-pipe Charley Anaston Dallas TX has turned 161-mph Formula 40 time very stock X40 could back up record hold Formula 40 record aK&B4ORRat 16181 mph received some photos contest re sults Nick Sher about BRM speed meet held September 24 25 near Allentown PA Nick says weekend rainy windy 670 Saturday 540 Sunday record speeds achieved Quay Barber Cleveland Glen Vansant Quay turned 9371 mph new Jr o record backed up 911 mph using TD 049 equipped new Gb Bee plug own molded high aspect ratio prop Glen blasted Senior Formula 40 15268 mph unable back up Next year right winners class through third place except B proto no entries Nich Sher also attended Dayton OH meet October 9 set new speed record 12157 mph using piped Cox 049 Al Stegans Cleve land OH turned 11837 mph open-faced no pipe prove can done pipe Frank Garzan put respectable 195 mph D speed using OPS 65 mini-pipe Beware because combination meets 78 79 rules October 15 16 saw Texas bunch get together Houston yearly end season contest five new national records established weather perfect 70 800 tem peratures 30% less humidity John Shannon started everything off right nice clean 196-mph B flight beat old 19347-mph record held himself Dub Jett dust hardly cleared Hempel Uptons mula 40 hit 16181 mph break old 15879-mph record backed up 15 minutes later slightly rich 1585mph flight congratulating other Shannon put back-up flight 198 mph really shook air figured John would relax after flight right after lunch put third flight fantastic 20032 mph make him fourth member cov eted 200-mph club John using own DJ529 80% nitro fuel Rev-up 7-11 TWA-type suction tank Sunday Patrick Hempel broke 18230-mph Senior C speed record clean 18530mph flight backed up another 185-mph flight Patrick using very stock K&B40 mini-pipe 7-12 Rev-up bladder fuel system 82% nitro fuel Ross Lewis father Jim couple new comers speed circle set Jr B profile proto record 122 mph backed up 120 mph Sunday afternoon became battle speed record Layman Giertz put screaming 18011 mph flight new record backed up put everything up until about 3 pm Dub Jett turned 18086-mph beat new record Dub blew two back-up attempts slow 174-mph flight lean Layman Gierty preparing battle again kept having problems engine cooling off Dub finally backed-up flight very clean 180 mph claim sixth final record weekend Boy did have fun new rules 1978-1979 have voted results I Drop proto replace profile proto age classes 2 B proto D speed will mini-pipes 3 All Jr Sr classes will mini-pipe next article David Layman will lay line tell go 180 mph speed Gene Hem pel Tom Upton 301 N Yale Garland TX 75042 CL Carrier/Perry continued page 45 above 600 attempt slow model will also cause loss low-speed score scale bonus 10 points now will awarded profile class rules rather liberal Acceptable designs de fined just Class Class II judging less restrictive Three-view drawings must presented no maximum allowable deviation scale classes judge must able see clearly model close repre sentation original airplane no restrictions moveable surfaces long overall outlines wing tail surfaces preserved no re quirement scale-like dihedral land ing gear location rules no changes will make existing models engines obsolete possible change required few profile class models will addition some type cockpit appropriate national markings Any planning build new Profile Car rier model should least consider building model will qualify scale bonus points number kits easily adopted new bonus point rule G-S Products Bearcat Corsair Skyraider excellent kits designed beginning Profile Carrier event old Sterling Mustang good can didate since P-SI D models used Navy takeoff landing trials 1944 Most full-scale carrier airplanes tapered wings scratch-building tapered wing requires cutting out lot different size ribs however numerous kits can used basis tapered-wing profile scale model Goldberg Shoestring swept leading edge Cosmic Wind straight leading edge yield about 360 square inches wing area Sterling Ring master same size category airplanes mild trailing edge taper construction method used Top Flite Flight Streak appropriate Flight Streak uses rectangular wing frame tapered trailing edge flap Sterling Yak-9 smaller may hard find should make good Airabonita minor changes wing tail outlines quite few straight-wing biplanes around earlier days naval aviation Sig Fokker D-VII Spad kits would good place start biplane could built around Harry Higleys Mo-Bipe design As new scale-like profile models developed would like include photos column Send black white glossy prints favorite model will try have photos published ask participation patience limited num ber photos can print month Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Aerobatics/Paul continued page 43 National PA Champion Junior 1976 Senior1977 Some stunters contend necessary balance props model en gines since cylinder en gine inherently unbalanced Dick Mathis some time ago others have talked recommend rotating prop 180 degrees crankshaft seems vibrating too much pointed out 100 Model Aviation method counteracts basic im balance engine imbalance prop can say occasions have tried think have de tected slight lessening vibration coming through lines say have three-bladed pro peller Let tell about time 73 FAI tryouts Bill Werwage convinced three-bladed prop needed some sort balancing should have seen trials heard com ments flying Bill Gieseke McDonald Gialdini few others tried figure out balance three-bladed prop hysterical few words general about propellers Regarding pitch numbers stamped blade usually measurement 75 percent distance hub tip about average pitch since outer 25 percent blade displaces about much air inner 75 percent least thats what Harry Hig ley carrier engine fame says wont go measuring pitch two reasons dont have pitch gauge think average flier better off trying several different stock props varying diameters pitches blade thick nesses before trying customize prop other balancing Some basics diameter pitch diameter helps turning ability maneu verability pitch helps speed generalities change 10-5 10-6 same rpm plane should go faster switch regular blade W EW probably will get noticeably line tension ever plane probably will speed up round loops Wider blades will put load engine have heavy airplane may prone wearing out engine However Les Mc Donald feels generally speaking heavy airplane 35 engine best prop would 10-6W larger 46-size airplane heavy 56 62 oz try 11-6 EW Top flute 12-6 maple prop wide blade least guarantees line tension can wonders confidence flying Three comments Les made recent Model Aviation article Stiletto re garding prop trimming should elabora ted bit Sanding airfoil tips gives some added line tension also gives tendency speed up con secutive maneuvers performed sanding back side blade rolled up piece sandpaper create airfoil effect like add ing pitch makes tip bite air slight ellipse tip planform lets prop unload smoother square corner expense some line ten sion Rounding squaredoff tips instance Zinger Rev-Up prop keeps blades biting much air plane doesnt jump around corners much Rounding leading edge gives vertical power slows down model tight turn Sanding leading edge prop will keep cutting air will drag engine will break sooner two-cycle instance upwind side wingover Good prop care feeding Dont fly chipped ragged prop have heard some fliers rub epoxy tips keep chipping sand off varnish balancing prepared have fuel soak wood again unbalance prop After balancing rub two thin coats clear balance again Les hobby salesman suggests end up prop extremely out balance take back shop ask exchange hobby dealer should return manufacturer sidelight theory writers main reasons getting such better maneuvering airplanes last couple years longer span stabi lizers elevators working surface out propeller slipstream slipstream can have powerful effect flight model especially have super-hog engine turning paddle blade Supertigre 46 have seen everything 10-6 right 11-7 Zinger Bob Baron 11-6 Rev-up 12-6 Top Flite 12-6 Rev-Up 13-5 think its matter pays nickel takes choice have airplane trimmed out tip weight February 1978 101 Please send _________ copies new third edition Radio Control Buyers Guide Enclosed $500 copy ordered $425 Guide plus $75 postage handling 3-book boxed set covers fastest racing machines 3 4 5-view scale drawings color schemes markings construc tion performance data pilots race results descriptive illustrated story 22 Unlimiteds 41 Formula ls 19 Sport Biplanes 6 AT6/SNJs current era plus over 90 great Thomp son Bendix Greve Goodyear racers 3Ds 40s plus fabulous S chneider Cup floatlanes oithe 20s Pulitzer Racers Gordon ennett Racers lamous European racers way back tirst air race win ner 1909 Curtiss Golden Flyer- IJtIA 234 planes all pIIt Quality printed 192 big B/s 5 11 pages trul fine reference POSTAGE tour aviation bra ry Oder yours INCLUDED O Early Air Racers 3-views 1909-29 o National Air Racers 3-views 29-49 O ModernAirRacersina-views 4975 495 495 495 Send Check Money Order PUBLICATIONS P0 505 2726 SEPT IOCHESTEE SEW 6036 14626 RETURN MAIL DELIVERY Name Street City StateZip leadouts flap bending nose weight line length handle spacing select about five six good different props spend about two weeks 20-40 flights switching props Keep notes Its easy forget after two three switches Some prop combinations 35-size engines flying Foxes have using following Giesekeplane 525 sq 40 oz Rev-up 10-6W Tom Dixon 9th FAT tryoutsplane 560 sq 45 oz Rev-up 10-6W Fast Richard Mathis 13th Natsplane 525 sq 41 oz Grish 3-blade Joe Musumeci 2nd Senior NatsRev up 10-6W Using Max 35 have Remel Cooper 7th FAIplane 625 sq 46 oz Rev-up 10-6W Dave Hem strought 10th FAI plane 630 sq 53 oz Rev-up 10-6 EW Dennis Adamisin FAI 13thplane 580 sq 47 oz Rev-up 10-6EW David Fitzgerald 1st Senior Natsplane stock Sig Chipmunk 42 oz Zinger 10-6 pilots using 40 engines have using Norm Whittle 9th Nats plane weighs 55 oz Rev-up 10-6W Paul Walker 14th Nats 640 sq plane 49 oz Rev-up 10-6 Zinger 10-6 Roger Barrett 15th Nats 550 sq plane 455 oz. Rev-up l0-6EW Tom Lay 19th Nats680 sq plane 49 os Rev-up 10-6W Steve McCann 20th Nats plane 550 sq 48 oz Rev-up 10-6 Lets forget Half-As Nats champion Bob Whitely used Cox 6-3 gray prop TD 051 plane weighing 10 oz 210 sq wing 76 Bob smaller 170 sq wtng same weight used Cox 55-4 prop David Fitzgerald won Senior Half-A using Pinto Dick Mathis design weighing 12 oz 34 span Cox 6-3 prop TD 049 information stunt PAMPA write Wynn Paul 1640 Maywick Dr Lexington KY 40504 FF Sport Scale/Kuenz continued page 55 sells soul evil duo happily fine features model scale builder As far concerned must OK skysters about draw backs mentioned earlier does illusionist handle distorts truth subtle changes result nothing grotesque deformed admirable representation real mach ine capable good performance free flight guess biggest drawback cause resultant misery model has times scale horse power prop size order get up stairs Because scale effect no in-flight control other alterations scale configuration necessary gain stability dihedral must increased model like Spirit St Louis done minimum destroy appearance Anyhow flat wing dihedral looks like droops bit added actually improves appearance High-wing cabin jobs like Spirit have inherent stability no need excessive dihedral sleek sky-slicing low-wingers another bag low-wing design has wing tapered planform luck Dihedral angles less noticeable tapered wing constant chord wing Cut tapered wing out card stock another constant chord wing well Give tapered wing half again much di hedral constant chord jobbie eyeball em different angles will seem wing has no dihedral other except view head An illusion Tiny tail feathers another bug-a-boo scale modelers couple ways approaching drawback course enlarge stabilizer good taste Dont pull Charlie Tuna simply add -in around perimeter destroying aspectratio changing appearance stab aspect-ratio must taken consideration enlarging tail stabilizer want enlarge has aspect-ratio six-to-one aspect-ratio relation average chord span enlargement must same ratio say add -in chord six times 1-in must added span preserves ap pearance efficient enlarg ing changing proportion have created illusion unaltered tail large extent Another method combines two subtle alterations scale configuration wash out wing tips mono plane will cover bipes multiplanes later washing out tips center section stalls first tips still lifting keep ship stall ing completely nose lowers flying speed regained assume rib-slicers know wash-out re duced incidence wing approach es tips performed during building later warping additional alteration scale stretch fuselage Haw-w-w-w Yeah use Pirelli longerons just Naw am kiddin course mean increase tail moment building little extra length fuselage aft wing trailing edge stern post Such change usually has drawn redrawn few times get good balance between what looks OK maximum stretch can add no set rule procedure skysters must use engineering intuitivity Igor Sikorsky called such things fuselage stretching must sometimes done stabilizer area en larged because gap between trail ing edge wing leading edge stabilizer has consequently shrunk worst tussle system ever experienced design Farman Jabiru Transport teeny stab enlarged quite bit thereby reducing distance between wing stab meant fuselage stretched Tissue trimmers must have redrawn fuselage half dozen times before suita ble balance arrived did destroy dumpy appearance Farman fuselage Part fun rubber scale modeling right fellas no such thing model tough build Some just take longer others thats Overcoming small stabilizer area bipe easy ground-looping Spad Decalage answer setting wings different angles incidence rela tive other have read few differ ing methods setting up biplanes lately 102 ModelAviation MORRISONSCALE DRAWINGS EPLA-TECHCATALOG 25c nlerIWt/OflG/ 48500 McKenzie Hwy Vida Oregon 97483 Charles Mendenhall
Edition: Model Aviation - 1978/02
Page Numbers: 43, 100, 101, 102
Aerobahcs El Wynn Paul WHILE AT THE Nationals Califor nia writer chance talk stunt judge Bill Fitzgerald about balancing props Bill San Mateo California airline captain has borrowed technique real airplanes says full-size props balanced three-step fashion tracking dynamic horizontal position static vertical position states trying practice March AFB runways naturally nicked prop Bill volunteered bal ance could watch re port first step balancing according Bill select prop semi-bal anced comes out package De pending upon pocketbook chance sift through local hobby shops supply may may have opportunity pre-select props Assuming have will bal ance out fairly well conventional hand-held prop balancer proceed next step Bill has homemade gauge see photo check tracking prop tips shows hub faces parallel Basically attaches prop hub piece adjusts movable thumb screw just touch blade After ro tating prop 180 degrees can seen other blade touches point thumb screw doesnt cases probably wont very light sanding flat surface inside part prop hub order sug gests numbering blades making dont forget after taking prop off jig couple passes 320 sandpaper sufficient alter tracking Now prop tracking correctly next bit balancing fa miliar type two razor blades altered Austin-Craft balancer again see photos Make certain jig level before setting work Bill has three wood screws bottom base adjust used level top base Level jig both directions razor blades wonder what sort razor blades use full-size props type balancing us have performing years set prop horizontally see side drops side drops simply sand off some wood back side blade until prop stays horizontal balancer Sand back side blades because wood removed front side will destroy airfoil blade After operation Bill balances prop dynamically vertical position prop razor blades vertical position blade up down sees blade will drop side other After sand ing neither blade drops checks static balance again hori zontal position whole operation took about 30 minutes probably longer necessary since ask lot questions will say prop after three-phase balancing seemed very good job no vibration little time some ingenuity average stunt flier could construct two jigs needed balance props way Bill has balanced props Bob Gieseke Ted Fancher Gary McClellan course son David February 1 978 43 Custom Mufiler mounted Chuck Delano ST-46 airplane pictures Wynn Paul Continued page 100 Prop balancing jig made trom Austin-Craft bal ancer Bill Fitzgerald has two-edged blades Prop tracking gauge aluminum bar stock miscellaneous parts Bill Fitzgerald As Bob Harpe 46-size Dixon Stilares text relates accurate propeller tracking 57-in foam wing gross weight 58 oz essential full-scale maintenance CATALOG 25c DAVIS 22 D-IKPLAN 1 CSD-7BY Chas E Steinchak MODERNISTIC MODELS PO B0X6974ALBUQNM87107, KITS S 0 ACCESSORIES BABY ACEP-N UT KITS N BEARINGS BROWN CO-2 ENGINES RE AL JAPANESE TISSUE-PROPS I17 SPAN 4COMPLETE CATALOG 50q IKIT $425MANY HARD TO FIND ITEMS Pee*-haw BOX 2493LA MESA CALIF 92041 4720 Ashbrook Rd Dallas TX have turned 18011 18086 mph respectively stock ST X-15s except chromed liners new heads Dub will chrome fit liners about $18 David will other work Brent Bussell Dallas TX has turned 186 stock X-29 understand Nick Shear 815 Beech Rd Langhorne PA 19047 has done 188 Patrick Hempel holds Senior B record 19264 mph practically stock K&B 40 mini-pipe Charley Anaston Dallas TX has turned 161-mph Formula 40 time very stock X40 could back up record hold Formula 40 record aK&B4ORRat 16181 mph received some photos contest re sults Nick Sher about BRM speed meet held September 24 25 near Allentown PA Nick says weekend rainy windy 670 Saturday 540 Sunday record speeds achieved Quay Barber Cleveland Glen Vansant Quay turned 9371 mph new Jr o record backed up 911 mph using TD 049 equipped new Gb Bee plug own molded high aspect ratio prop Glen blasted Senior Formula 40 15268 mph unable back up Next year right winners class through third place except B proto no entries Nich Sher also attended Dayton OH meet October 9 set new speed record 12157 mph using piped Cox 049 Al Stegans Cleve land OH turned 11837 mph open-faced no pipe prove can done pipe Frank Garzan put respectable 195 mph D speed using OPS 65 mini-pipe Beware because combination meets 78 79 rules October 15 16 saw Texas bunch get together Houston yearly end season contest five new national records established weather perfect 70 800 tem peratures 30% less humidity John Shannon started everything off right nice clean 196-mph B flight beat old 19347-mph record held himself Dub Jett dust hardly cleared Hempel Uptons mula 40 hit 16181 mph break old 15879-mph record backed up 15 minutes later slightly rich 1585mph flight congratulating other Shannon put back-up flight 198 mph really shook air figured John would relax after flight right after lunch put third flight fantastic 20032 mph make him fourth member cov eted 200-mph club John using own DJ529 80% nitro fuel Rev-up 7-11 TWA-type suction tank Sunday Patrick Hempel broke 18230-mph Senior C speed record clean 18530mph flight backed up another 185-mph flight Patrick using very stock K&B40 mini-pipe 7-12 Rev-up bladder fuel system 82% nitro fuel Ross Lewis father Jim couple new comers speed circle set Jr B profile proto record 122 mph backed up 120 mph Sunday afternoon became battle speed record Layman Giertz put screaming 18011 mph flight new record backed up put everything up until about 3 pm Dub Jett turned 18086-mph beat new record Dub blew two back-up attempts slow 174-mph flight lean Layman Gierty preparing battle again kept having problems engine cooling off Dub finally backed-up flight very clean 180 mph claim sixth final record weekend Boy did have fun new rules 1978-1979 have voted results I Drop proto replace profile proto age classes 2 B proto D speed will mini-pipes 3 All Jr Sr classes will mini-pipe next article David Layman will lay line tell go 180 mph speed Gene Hem pel Tom Upton 301 N Yale Garland TX 75042 CL Carrier/Perry continued page 45 above 600 attempt slow model will also cause loss low-speed score scale bonus 10 points now will awarded profile class rules rather liberal Acceptable designs de fined just Class Class II judging less restrictive Three-view drawings must presented no maximum allowable deviation scale classes judge must able see clearly model close repre sentation original airplane no restrictions moveable surfaces long overall outlines wing tail surfaces preserved no re quirement scale-like dihedral land ing gear location rules no changes will make existing models engines obsolete possible change required few profile class models will addition some type cockpit appropriate national markings Any planning build new Profile Car rier model should least consider building model will qualify scale bonus points number kits easily adopted new bonus point rule G-S Products Bearcat Corsair Skyraider excellent kits designed beginning Profile Carrier event old Sterling Mustang good can didate since P-SI D models used Navy takeoff landing trials 1944 Most full-scale carrier airplanes tapered wings scratch-building tapered wing requires cutting out lot different size ribs however numerous kits can used basis tapered-wing profile scale model Goldberg Shoestring swept leading edge Cosmic Wind straight leading edge yield about 360 square inches wing area Sterling Ring master same size category airplanes mild trailing edge taper construction method used Top Flite Flight Streak appropriate Flight Streak uses rectangular wing frame tapered trailing edge flap Sterling Yak-9 smaller may hard find should make good Airabonita minor changes wing tail outlines quite few straight-wing biplanes around earlier days naval aviation Sig Fokker D-VII Spad kits would good place start biplane could built around Harry Higleys Mo-Bipe design As new scale-like profile models developed would like include photos column Send black white glossy prints favorite model will try have photos published ask participation patience limited num ber photos can print month Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Aerobatics/Paul continued page 43 National PA Champion Junior 1976 Senior1977 Some stunters contend necessary balance props model en gines since cylinder en gine inherently unbalanced Dick Mathis some time ago others have talked recommend rotating prop 180 degrees crankshaft seems vibrating too much pointed out 100 Model Aviation method counteracts basic im balance engine imbalance prop can say occasions have tried think have de tected slight lessening vibration coming through lines say have three-bladed pro peller Let tell about time 73 FAI tryouts Bill Werwage convinced three-bladed prop needed some sort balancing should have seen trials heard com ments flying Bill Gieseke McDonald Gialdini few others tried figure out balance three-bladed prop hysterical few words general about propellers Regarding pitch numbers stamped blade usually measurement 75 percent distance hub tip about average pitch since outer 25 percent blade displaces about much air inner 75 percent least thats what Harry Hig ley carrier engine fame says wont go measuring pitch two reasons dont have pitch gauge think average flier better off trying several different stock props varying diameters pitches blade thick nesses before trying customize prop other balancing Some basics diameter pitch diameter helps turning ability maneu verability pitch helps speed generalities change 10-5 10-6 same rpm plane should go faster switch regular blade W EW probably will get noticeably line tension ever plane probably will speed up round loops Wider blades will put load engine have heavy airplane may prone wearing out engine However Les Mc Donald feels generally speaking heavy airplane 35 engine best prop would 10-6W larger 46-size airplane heavy 56 62 oz try 11-6 EW Top flute 12-6 maple prop wide blade least guarantees line tension can wonders confidence flying Three comments Les made recent Model Aviation article Stiletto re garding prop trimming should elabora ted bit Sanding airfoil tips gives some added line tension also gives tendency speed up con secutive maneuvers performed sanding back side blade rolled up piece sandpaper create airfoil effect like add ing pitch makes tip bite air slight ellipse tip planform lets prop unload smoother square corner expense some line ten sion Rounding squaredoff tips instance Zinger Rev-Up prop keeps blades biting much air plane doesnt jump around corners much Rounding leading edge gives vertical power slows down model tight turn Sanding leading edge prop will keep cutting air will drag engine will break sooner two-cycle instance upwind side wingover Good prop care feeding Dont fly chipped ragged prop have heard some fliers rub epoxy tips keep chipping sand off varnish balancing prepared have fuel soak wood again unbalance prop After balancing rub two thin coats clear balance again Les hobby salesman suggests end up prop extremely out balance take back shop ask exchange hobby dealer should return manufacturer sidelight theory writers main reasons getting such better maneuvering airplanes last couple years longer span stabi lizers elevators working surface out propeller slipstream slipstream can have powerful effect flight model especially have super-hog engine turning paddle blade Supertigre 46 have seen everything 10-6 right 11-7 Zinger Bob Baron 11-6 Rev-up 12-6 Top Flite 12-6 Rev-Up 13-5 think its matter pays nickel takes choice have airplane trimmed out tip weight February 1978 101 Please send _________ copies new third edition Radio Control Buyers Guide Enclosed $500 copy ordered $425 Guide plus $75 postage handling 3-book boxed set covers fastest racing machines 3 4 5-view scale drawings color schemes markings construc tion performance data pilots race results descriptive illustrated story 22 Unlimiteds 41 Formula ls 19 Sport Biplanes 6 AT6/SNJs current era plus over 90 great Thomp son Bendix Greve Goodyear racers 3Ds 40s plus fabulous S chneider Cup floatlanes oithe 20s Pulitzer Racers Gordon ennett Racers lamous European racers way back tirst air race win ner 1909 Curtiss Golden Flyer- IJtIA 234 planes all pIIt Quality printed 192 big B/s 5 11 pages trul fine reference POSTAGE tour aviation bra ry Oder yours INCLUDED O Early Air Racers 3-views 1909-29 o National Air Racers 3-views 29-49 O ModernAirRacersina-views 4975 495 495 495 Send Check Money Order PUBLICATIONS P0 505 2726 SEPT IOCHESTEE SEW 6036 14626 RETURN MAIL DELIVERY Name Street City StateZip leadouts flap bending nose weight line length handle spacing select about five six good different props spend about two weeks 20-40 flights switching props Keep notes Its easy forget after two three switches Some prop combinations 35-size engines flying Foxes have using following Giesekeplane 525 sq 40 oz Rev-up 10-6W Tom Dixon 9th FAT tryoutsplane 560 sq 45 oz Rev-up 10-6W Fast Richard Mathis 13th Natsplane 525 sq 41 oz Grish 3-blade Joe Musumeci 2nd Senior NatsRev up 10-6W Using Max 35 have Remel Cooper 7th FAIplane 625 sq 46 oz Rev-up 10-6W Dave Hem strought 10th FAI plane 630 sq 53 oz Rev-up 10-6 EW Dennis Adamisin FAI 13thplane 580 sq 47 oz Rev-up 10-6EW David Fitzgerald 1st Senior Natsplane stock Sig Chipmunk 42 oz Zinger 10-6 pilots using 40 engines have using Norm Whittle 9th Nats plane weighs 55 oz Rev-up 10-6W Paul Walker 14th Nats 640 sq plane 49 oz Rev-up 10-6 Zinger 10-6 Roger Barrett 15th Nats 550 sq plane 455 oz. Rev-up l0-6EW Tom Lay 19th Nats680 sq plane 49 os Rev-up 10-6W Steve McCann 20th Nats plane 550 sq 48 oz Rev-up 10-6 Lets forget Half-As Nats champion Bob Whitely used Cox 6-3 gray prop TD 051 plane weighing 10 oz 210 sq wing 76 Bob smaller 170 sq wtng same weight used Cox 55-4 prop David Fitzgerald won Senior Half-A using Pinto Dick Mathis design weighing 12 oz 34 span Cox 6-3 prop TD 049 information stunt PAMPA write Wynn Paul 1640 Maywick Dr Lexington KY 40504 FF Sport Scale/Kuenz continued page 55 sells soul evil duo happily fine features model scale builder As far concerned must OK skysters about draw backs mentioned earlier does illusionist handle distorts truth subtle changes result nothing grotesque deformed admirable representation real mach ine capable good performance free flight guess biggest drawback cause resultant misery model has times scale horse power prop size order get up stairs Because scale effect no in-flight control other alterations scale configuration necessary gain stability dihedral must increased model like Spirit St Louis done minimum destroy appearance Anyhow flat wing dihedral looks like droops bit added actually improves appearance High-wing cabin jobs like Spirit have inherent stability no need excessive dihedral sleek sky-slicing low-wingers another bag low-wing design has wing tapered planform luck Dihedral angles less noticeable tapered wing constant chord wing Cut tapered wing out card stock another constant chord wing well Give tapered wing half again much di hedral constant chord jobbie eyeball em different angles will seem wing has no dihedral other except view head An illusion Tiny tail feathers another bug-a-boo scale modelers couple ways approaching drawback course enlarge stabilizer good taste Dont pull Charlie Tuna simply add -in around perimeter destroying aspectratio changing appearance stab aspect-ratio must taken consideration enlarging tail stabilizer want enlarge has aspect-ratio six-to-one aspect-ratio relation average chord span enlargement must same ratio say add -in chord six times 1-in must added span preserves ap pearance efficient enlarg ing changing proportion have created illusion unaltered tail large extent Another method combines two subtle alterations scale configuration wash out wing tips mono plane will cover bipes multiplanes later washing out tips center section stalls first tips still lifting keep ship stall ing completely nose lowers flying speed regained assume rib-slicers know wash-out re duced incidence wing approach es tips performed during building later warping additional alteration scale stretch fuselage Haw-w-w-w Yeah use Pirelli longerons just Naw am kiddin course mean increase tail moment building little extra length fuselage aft wing trailing edge stern post Such change usually has drawn redrawn few times get good balance between what looks OK maximum stretch can add no set rule procedure skysters must use engineering intuitivity Igor Sikorsky called such things fuselage stretching must sometimes done stabilizer area en larged because gap between trail ing edge wing leading edge stabilizer has consequently shrunk worst tussle system ever experienced design Farman Jabiru Transport teeny stab enlarged quite bit thereby reducing distance between wing stab meant fuselage stretched Tissue trimmers must have redrawn fuselage half dozen times before suita ble balance arrived did destroy dumpy appearance Farman fuselage Part fun rubber scale modeling right fellas no such thing model tough build Some just take longer others thats Overcoming small stabilizer area bipe easy ground-looping Spad Decalage answer setting wings different angles incidence rela tive other have read few differ ing methods setting up biplanes lately 102 ModelAviation MORRISONSCALE DRAWINGS EPLA-TECHCATALOG 25c nlerIWt/OflG/ 48500 McKenzie Hwy Vida Oregon 97483 Charles Mendenhall
Edition: Model Aviation - 1978/02
Page Numbers: 43, 100, 101, 102
Aerobahcs El Wynn Paul WHILE AT THE Nationals Califor nia writer chance talk stunt judge Bill Fitzgerald about balancing props Bill San Mateo California airline captain has borrowed technique real airplanes says full-size props balanced three-step fashion tracking dynamic horizontal position static vertical position states trying practice March AFB runways naturally nicked prop Bill volunteered bal ance could watch re port first step balancing according Bill select prop semi-bal anced comes out package De pending upon pocketbook chance sift through local hobby shops supply may may have opportunity pre-select props Assuming have will bal ance out fairly well conventional hand-held prop balancer proceed next step Bill has homemade gauge see photo check tracking prop tips shows hub faces parallel Basically attaches prop hub piece adjusts movable thumb screw just touch blade After ro tating prop 180 degrees can seen other blade touches point thumb screw doesnt cases probably wont very light sanding flat surface inside part prop hub order sug gests numbering blades making dont forget after taking prop off jig couple passes 320 sandpaper sufficient alter tracking Now prop tracking correctly next bit balancing fa miliar type two razor blades altered Austin-Craft balancer again see photos Make certain jig level before setting work Bill has three wood screws bottom base adjust used level top base Level jig both directions razor blades wonder what sort razor blades use full-size props type balancing us have performing years set prop horizontally see side drops side drops simply sand off some wood back side blade until prop stays horizontal balancer Sand back side blades because wood removed front side will destroy airfoil blade After operation Bill balances prop dynamically vertical position prop razor blades vertical position blade up down sees blade will drop side other After sand ing neither blade drops checks static balance again hori zontal position whole operation took about 30 minutes probably longer necessary since ask lot questions will say prop after three-phase balancing seemed very good job no vibration little time some ingenuity average stunt flier could construct two jigs needed balance props way Bill has balanced props Bob Gieseke Ted Fancher Gary McClellan course son David February 1 978 43 Custom Mufiler mounted Chuck Delano ST-46 airplane pictures Wynn Paul Continued page 100 Prop balancing jig made trom Austin-Craft bal ancer Bill Fitzgerald has two-edged blades Prop tracking gauge aluminum bar stock miscellaneous parts Bill Fitzgerald As Bob Harpe 46-size Dixon Stilares text relates accurate propeller tracking 57-in foam wing gross weight 58 oz essential full-scale maintenance CATALOG 25c DAVIS 22 D-IKPLAN 1 CSD-7BY Chas E Steinchak MODERNISTIC MODELS PO B0X6974ALBUQNM87107, KITS S 0 ACCESSORIES BABY ACEP-N UT KITS N BEARINGS BROWN CO-2 ENGINES RE AL JAPANESE TISSUE-PROPS I17 SPAN 4COMPLETE CATALOG 50q IKIT $425MANY HARD TO FIND ITEMS Pee*-haw BOX 2493LA MESA CALIF 92041 4720 Ashbrook Rd Dallas TX have turned 18011 18086 mph respectively stock ST X-15s except chromed liners new heads Dub will chrome fit liners about $18 David will other work Brent Bussell Dallas TX has turned 186 stock X-29 understand Nick Shear 815 Beech Rd Langhorne PA 19047 has done 188 Patrick Hempel holds Senior B record 19264 mph practically stock K&B 40 mini-pipe Charley Anaston Dallas TX has turned 161-mph Formula 40 time very stock X40 could back up record hold Formula 40 record aK&B4ORRat 16181 mph received some photos contest re sults Nick Sher about BRM speed meet held September 24 25 near Allentown PA Nick says weekend rainy windy 670 Saturday 540 Sunday record speeds achieved Quay Barber Cleveland Glen Vansant Quay turned 9371 mph new Jr o record backed up 911 mph using TD 049 equipped new Gb Bee plug own molded high aspect ratio prop Glen blasted Senior Formula 40 15268 mph unable back up Next year right winners class through third place except B proto no entries Nich Sher also attended Dayton OH meet October 9 set new speed record 12157 mph using piped Cox 049 Al Stegans Cleve land OH turned 11837 mph open-faced no pipe prove can done pipe Frank Garzan put respectable 195 mph D speed using OPS 65 mini-pipe Beware because combination meets 78 79 rules October 15 16 saw Texas bunch get together Houston yearly end season contest five new national records established weather perfect 70 800 tem peratures 30% less humidity John Shannon started everything off right nice clean 196-mph B flight beat old 19347-mph record held himself Dub Jett dust hardly cleared Hempel Uptons mula 40 hit 16181 mph break old 15879-mph record backed up 15 minutes later slightly rich 1585mph flight congratulating other Shannon put back-up flight 198 mph really shook air figured John would relax after flight right after lunch put third flight fantastic 20032 mph make him fourth member cov eted 200-mph club John using own DJ529 80% nitro fuel Rev-up 7-11 TWA-type suction tank Sunday Patrick Hempel broke 18230-mph Senior C speed record clean 18530mph flight backed up another 185-mph flight Patrick using very stock K&B40 mini-pipe 7-12 Rev-up bladder fuel system 82% nitro fuel Ross Lewis father Jim couple new comers speed circle set Jr B profile proto record 122 mph backed up 120 mph Sunday afternoon became battle speed record Layman Giertz put screaming 18011 mph flight new record backed up put everything up until about 3 pm Dub Jett turned 18086-mph beat new record Dub blew two back-up attempts slow 174-mph flight lean Layman Gierty preparing battle again kept having problems engine cooling off Dub finally backed-up flight very clean 180 mph claim sixth final record weekend Boy did have fun new rules 1978-1979 have voted results I Drop proto replace profile proto age classes 2 B proto D speed will mini-pipes 3 All Jr Sr classes will mini-pipe next article David Layman will lay line tell go 180 mph speed Gene Hem pel Tom Upton 301 N Yale Garland TX 75042 CL Carrier/Perry continued page 45 above 600 attempt slow model will also cause loss low-speed score scale bonus 10 points now will awarded profile class rules rather liberal Acceptable designs de fined just Class Class II judging less restrictive Three-view drawings must presented no maximum allowable deviation scale classes judge must able see clearly model close repre sentation original airplane no restrictions moveable surfaces long overall outlines wing tail surfaces preserved no re quirement scale-like dihedral land ing gear location rules no changes will make existing models engines obsolete possible change required few profile class models will addition some type cockpit appropriate national markings Any planning build new Profile Car rier model should least consider building model will qualify scale bonus points number kits easily adopted new bonus point rule G-S Products Bearcat Corsair Skyraider excellent kits designed beginning Profile Carrier event old Sterling Mustang good can didate since P-SI D models used Navy takeoff landing trials 1944 Most full-scale carrier airplanes tapered wings scratch-building tapered wing requires cutting out lot different size ribs however numerous kits can used basis tapered-wing profile scale model Goldberg Shoestring swept leading edge Cosmic Wind straight leading edge yield about 360 square inches wing area Sterling Ring master same size category airplanes mild trailing edge taper construction method used Top Flite Flight Streak appropriate Flight Streak uses rectangular wing frame tapered trailing edge flap Sterling Yak-9 smaller may hard find should make good Airabonita minor changes wing tail outlines quite few straight-wing biplanes around earlier days naval aviation Sig Fokker D-VII Spad kits would good place start biplane could built around Harry Higleys Mo-Bipe design As new scale-like profile models developed would like include photos column Send black white glossy prints favorite model will try have photos published ask participation patience limited num ber photos can print month Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Aerobatics/Paul continued page 43 National PA Champion Junior 1976 Senior1977 Some stunters contend necessary balance props model en gines since cylinder en gine inherently unbalanced Dick Mathis some time ago others have talked recommend rotating prop 180 degrees crankshaft seems vibrating too much pointed out 100 Model Aviation method counteracts basic im balance engine imbalance prop can say occasions have tried think have de tected slight lessening vibration coming through lines say have three-bladed pro peller Let tell about time 73 FAI tryouts Bill Werwage convinced three-bladed prop needed some sort balancing should have seen trials heard com ments flying Bill Gieseke McDonald Gialdini few others tried figure out balance three-bladed prop hysterical few words general about propellers Regarding pitch numbers stamped blade usually measurement 75 percent distance hub tip about average pitch since outer 25 percent blade displaces about much air inner 75 percent least thats what Harry Hig ley carrier engine fame says wont go measuring pitch two reasons dont have pitch gauge think average flier better off trying several different stock props varying diameters pitches blade thick nesses before trying customize prop other balancing Some basics diameter pitch diameter helps turning ability maneu verability pitch helps speed generalities change 10-5 10-6 same rpm plane should go faster switch regular blade W EW probably will get noticeably line tension ever plane probably will speed up round loops Wider blades will put load engine have heavy airplane may prone wearing out engine However Les Mc Donald feels generally speaking heavy airplane 35 engine best prop would 10-6W larger 46-size airplane heavy 56 62 oz try 11-6 EW Top flute 12-6 maple prop wide blade least guarantees line tension can wonders confidence flying Three comments Les made recent Model Aviation article Stiletto re garding prop trimming should elabora ted bit Sanding airfoil tips gives some added line tension also gives tendency speed up con secutive maneuvers performed sanding back side blade rolled up piece sandpaper create airfoil effect like add ing pitch makes tip bite air slight ellipse tip planform lets prop unload smoother square corner expense some line ten sion Rounding squaredoff tips instance Zinger Rev-Up prop keeps blades biting much air plane doesnt jump around corners much Rounding leading edge gives vertical power slows down model tight turn Sanding leading edge prop will keep cutting air will drag engine will break sooner two-cycle instance upwind side wingover Good prop care feeding Dont fly chipped ragged prop have heard some fliers rub epoxy tips keep chipping sand off varnish balancing prepared have fuel soak wood again unbalance prop After balancing rub two thin coats clear balance again Les hobby salesman suggests end up prop extremely out balance take back shop ask exchange hobby dealer should return manufacturer sidelight theory writers main reasons getting such better maneuvering airplanes last couple years longer span stabi lizers elevators working surface out propeller slipstream slipstream can have powerful effect flight model especially have super-hog engine turning paddle blade Supertigre 46 have seen everything 10-6 right 11-7 Zinger Bob Baron 11-6 Rev-up 12-6 Top Flite 12-6 Rev-Up 13-5 think its matter pays nickel takes choice have airplane trimmed out tip weight February 1978 101 Please send _________ copies new third edition Radio Control Buyers Guide Enclosed $500 copy ordered $425 Guide plus $75 postage handling 3-book boxed set covers fastest racing machines 3 4 5-view scale drawings color schemes markings construc tion performance data pilots race results descriptive illustrated story 22 Unlimiteds 41 Formula ls 19 Sport Biplanes 6 AT6/SNJs current era plus over 90 great Thomp son Bendix Greve Goodyear racers 3Ds 40s plus fabulous S chneider Cup floatlanes oithe 20s Pulitzer Racers Gordon ennett Racers lamous European racers way back tirst air race win ner 1909 Curtiss Golden Flyer- IJtIA 234 planes all pIIt Quality printed 192 big B/s 5 11 pages trul fine reference POSTAGE tour aviation bra ry Oder yours INCLUDED O Early Air Racers 3-views 1909-29 o National Air Racers 3-views 29-49 O ModernAirRacersina-views 4975 495 495 495 Send Check Money Order PUBLICATIONS P0 505 2726 SEPT IOCHESTEE SEW 6036 14626 RETURN MAIL DELIVERY Name Street City StateZip leadouts flap bending nose weight line length handle spacing select about five six good different props spend about two weeks 20-40 flights switching props Keep notes Its easy forget after two three switches Some prop combinations 35-size engines flying Foxes have using following Giesekeplane 525 sq 40 oz Rev-up 10-6W Tom Dixon 9th FAT tryoutsplane 560 sq 45 oz Rev-up 10-6W Fast Richard Mathis 13th Natsplane 525 sq 41 oz Grish 3-blade Joe Musumeci 2nd Senior NatsRev up 10-6W Using Max 35 have Remel Cooper 7th FAIplane 625 sq 46 oz Rev-up 10-6W Dave Hem strought 10th FAI plane 630 sq 53 oz Rev-up 10-6 EW Dennis Adamisin FAI 13thplane 580 sq 47 oz Rev-up 10-6EW David Fitzgerald 1st Senior Natsplane stock Sig Chipmunk 42 oz Zinger 10-6 pilots using 40 engines have using Norm Whittle 9th Nats plane weighs 55 oz Rev-up 10-6W Paul Walker 14th Nats 640 sq plane 49 oz Rev-up 10-6 Zinger 10-6 Roger Barrett 15th Nats 550 sq plane 455 oz. Rev-up l0-6EW Tom Lay 19th Nats680 sq plane 49 os Rev-up 10-6W Steve McCann 20th Nats plane 550 sq 48 oz Rev-up 10-6 Lets forget Half-As Nats champion Bob Whitely used Cox 6-3 gray prop TD 051 plane weighing 10 oz 210 sq wing 76 Bob smaller 170 sq wtng same weight used Cox 55-4 prop David Fitzgerald won Senior Half-A using Pinto Dick Mathis design weighing 12 oz 34 span Cox 6-3 prop TD 049 information stunt PAMPA write Wynn Paul 1640 Maywick Dr Lexington KY 40504 FF Sport Scale/Kuenz continued page 55 sells soul evil duo happily fine features model scale builder As far concerned must OK skysters about draw backs mentioned earlier does illusionist handle distorts truth subtle changes result nothing grotesque deformed admirable representation real mach ine capable good performance free flight guess biggest drawback cause resultant misery model has times scale horse power prop size order get up stairs Because scale effect no in-flight control other alterations scale configuration necessary gain stability dihedral must increased model like Spirit St Louis done minimum destroy appearance Anyhow flat wing dihedral looks like droops bit added actually improves appearance High-wing cabin jobs like Spirit have inherent stability no need excessive dihedral sleek sky-slicing low-wingers another bag low-wing design has wing tapered planform luck Dihedral angles less noticeable tapered wing constant chord wing Cut tapered wing out card stock another constant chord wing well Give tapered wing half again much di hedral constant chord jobbie eyeball em different angles will seem wing has no dihedral other except view head An illusion Tiny tail feathers another bug-a-boo scale modelers couple ways approaching drawback course enlarge stabilizer good taste Dont pull Charlie Tuna simply add -in around perimeter destroying aspectratio changing appearance stab aspect-ratio must taken consideration enlarging tail stabilizer want enlarge has aspect-ratio six-to-one aspect-ratio relation average chord span enlargement must same ratio say add -in chord six times 1-in must added span preserves ap pearance efficient enlarg ing changing proportion have created illusion unaltered tail large extent Another method combines two subtle alterations scale configuration wash out wing tips mono plane will cover bipes multiplanes later washing out tips center section stalls first tips still lifting keep ship stall ing completely nose lowers flying speed regained assume rib-slicers know wash-out re duced incidence wing approach es tips performed during building later warping additional alteration scale stretch fuselage Haw-w-w-w Yeah use Pirelli longerons just Naw am kiddin course mean increase tail moment building little extra length fuselage aft wing trailing edge stern post Such change usually has drawn redrawn few times get good balance between what looks OK maximum stretch can add no set rule procedure skysters must use engineering intuitivity Igor Sikorsky called such things fuselage stretching must sometimes done stabilizer area en larged because gap between trail ing edge wing leading edge stabilizer has consequently shrunk worst tussle system ever experienced design Farman Jabiru Transport teeny stab enlarged quite bit thereby reducing distance between wing stab meant fuselage stretched Tissue trimmers must have redrawn fuselage half dozen times before suita ble balance arrived did destroy dumpy appearance Farman fuselage Part fun rubber scale modeling right fellas no such thing model tough build Some just take longer others thats Overcoming small stabilizer area bipe easy ground-looping Spad Decalage answer setting wings different angles incidence rela tive other have read few differ ing methods setting up biplanes lately 102 ModelAviation MORRISONSCALE DRAWINGS EPLA-TECHCATALOG 25c nlerIWt/OflG/ 48500 McKenzie Hwy Vida Oregon 97483 Charles Mendenhall
Edition: Model Aviation - 1978/02
Page Numbers: 43, 100, 101, 102
Aerobahcs El Wynn Paul WHILE AT THE Nationals Califor nia writer chance talk stunt judge Bill Fitzgerald about balancing props Bill San Mateo California airline captain has borrowed technique real airplanes says full-size props balanced three-step fashion tracking dynamic horizontal position static vertical position states trying practice March AFB runways naturally nicked prop Bill volunteered bal ance could watch re port first step balancing according Bill select prop semi-bal anced comes out package De pending upon pocketbook chance sift through local hobby shops supply may may have opportunity pre-select props Assuming have will bal ance out fairly well conventional hand-held prop balancer proceed next step Bill has homemade gauge see photo check tracking prop tips shows hub faces parallel Basically attaches prop hub piece adjusts movable thumb screw just touch blade After ro tating prop 180 degrees can seen other blade touches point thumb screw doesnt cases probably wont very light sanding flat surface inside part prop hub order sug gests numbering blades making dont forget after taking prop off jig couple passes 320 sandpaper sufficient alter tracking Now prop tracking correctly next bit balancing fa miliar type two razor blades altered Austin-Craft balancer again see photos Make certain jig level before setting work Bill has three wood screws bottom base adjust used level top base Level jig both directions razor blades wonder what sort razor blades use full-size props type balancing us have performing years set prop horizontally see side drops side drops simply sand off some wood back side blade until prop stays horizontal balancer Sand back side blades because wood removed front side will destroy airfoil blade After operation Bill balances prop dynamically vertical position prop razor blades vertical position blade up down sees blade will drop side other After sand ing neither blade drops checks static balance again hori zontal position whole operation took about 30 minutes probably longer necessary since ask lot questions will say prop after three-phase balancing seemed very good job no vibration little time some ingenuity average stunt flier could construct two jigs needed balance props way Bill has balanced props Bob Gieseke Ted Fancher Gary McClellan course son David February 1 978 43 Custom Mufiler mounted Chuck Delano ST-46 airplane pictures Wynn Paul Continued page 100 Prop balancing jig made trom Austin-Craft bal ancer Bill Fitzgerald has two-edged blades Prop tracking gauge aluminum bar stock miscellaneous parts Bill Fitzgerald As Bob Harpe 46-size Dixon Stilares text relates accurate propeller tracking 57-in foam wing gross weight 58 oz essential full-scale maintenance CATALOG 25c DAVIS 22 D-IKPLAN 1 CSD-7BY Chas E Steinchak MODERNISTIC MODELS PO B0X6974ALBUQNM87107, KITS S 0 ACCESSORIES BABY ACEP-N UT KITS N BEARINGS BROWN CO-2 ENGINES RE AL JAPANESE TISSUE-PROPS I17 SPAN 4COMPLETE CATALOG 50q IKIT $425MANY HARD TO FIND ITEMS Pee*-haw BOX 2493LA MESA CALIF 92041 4720 Ashbrook Rd Dallas TX have turned 18011 18086 mph respectively stock ST X-15s except chromed liners new heads Dub will chrome fit liners about $18 David will other work Brent Bussell Dallas TX has turned 186 stock X-29 understand Nick Shear 815 Beech Rd Langhorne PA 19047 has done 188 Patrick Hempel holds Senior B record 19264 mph practically stock K&B 40 mini-pipe Charley Anaston Dallas TX has turned 161-mph Formula 40 time very stock X40 could back up record hold Formula 40 record aK&B4ORRat 16181 mph received some photos contest re sults Nick Sher about BRM speed meet held September 24 25 near Allentown PA Nick says weekend rainy windy 670 Saturday 540 Sunday record speeds achieved Quay Barber Cleveland Glen Vansant Quay turned 9371 mph new Jr o record backed up 911 mph using TD 049 equipped new Gb Bee plug own molded high aspect ratio prop Glen blasted Senior Formula 40 15268 mph unable back up Next year right winners class through third place except B proto no entries Nich Sher also attended Dayton OH meet October 9 set new speed record 12157 mph using piped Cox 049 Al Stegans Cleve land OH turned 11837 mph open-faced no pipe prove can done pipe Frank Garzan put respectable 195 mph D speed using OPS 65 mini-pipe Beware because combination meets 78 79 rules October 15 16 saw Texas bunch get together Houston yearly end season contest five new national records established weather perfect 70 800 tem peratures 30% less humidity John Shannon started everything off right nice clean 196-mph B flight beat old 19347-mph record held himself Dub Jett dust hardly cleared Hempel Uptons mula 40 hit 16181 mph break old 15879-mph record backed up 15 minutes later slightly rich 1585mph flight congratulating other Shannon put back-up flight 198 mph really shook air figured John would relax after flight right after lunch put third flight fantastic 20032 mph make him fourth member cov eted 200-mph club John using own DJ529 80% nitro fuel Rev-up 7-11 TWA-type suction tank Sunday Patrick Hempel broke 18230-mph Senior C speed record clean 18530mph flight backed up another 185-mph flight Patrick using very stock K&B40 mini-pipe 7-12 Rev-up bladder fuel system 82% nitro fuel Ross Lewis father Jim couple new comers speed circle set Jr B profile proto record 122 mph backed up 120 mph Sunday afternoon became battle speed record Layman Giertz put screaming 18011 mph flight new record backed up put everything up until about 3 pm Dub Jett turned 18086-mph beat new record Dub blew two back-up attempts slow 174-mph flight lean Layman Gierty preparing battle again kept having problems engine cooling off Dub finally backed-up flight very clean 180 mph claim sixth final record weekend Boy did have fun new rules 1978-1979 have voted results I Drop proto replace profile proto age classes 2 B proto D speed will mini-pipes 3 All Jr Sr classes will mini-pipe next article David Layman will lay line tell go 180 mph speed Gene Hem pel Tom Upton 301 N Yale Garland TX 75042 CL Carrier/Perry continued page 45 above 600 attempt slow model will also cause loss low-speed score scale bonus 10 points now will awarded profile class rules rather liberal Acceptable designs de fined just Class Class II judging less restrictive Three-view drawings must presented no maximum allowable deviation scale classes judge must able see clearly model close repre sentation original airplane no restrictions moveable surfaces long overall outlines wing tail surfaces preserved no re quirement scale-like dihedral land ing gear location rules no changes will make existing models engines obsolete possible change required few profile class models will addition some type cockpit appropriate national markings Any planning build new Profile Car rier model should least consider building model will qualify scale bonus points number kits easily adopted new bonus point rule G-S Products Bearcat Corsair Skyraider excellent kits designed beginning Profile Carrier event old Sterling Mustang good can didate since P-SI D models used Navy takeoff landing trials 1944 Most full-scale carrier airplanes tapered wings scratch-building tapered wing requires cutting out lot different size ribs however numerous kits can used basis tapered-wing profile scale model Goldberg Shoestring swept leading edge Cosmic Wind straight leading edge yield about 360 square inches wing area Sterling Ring master same size category airplanes mild trailing edge taper construction method used Top Flite Flight Streak appropriate Flight Streak uses rectangular wing frame tapered trailing edge flap Sterling Yak-9 smaller may hard find should make good Airabonita minor changes wing tail outlines quite few straight-wing biplanes around earlier days naval aviation Sig Fokker D-VII Spad kits would good place start biplane could built around Harry Higleys Mo-Bipe design As new scale-like profile models developed would like include photos column Send black white glossy prints favorite model will try have photos published ask participation patience limited num ber photos can print month Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Aerobatics/Paul continued page 43 National PA Champion Junior 1976 Senior1977 Some stunters contend necessary balance props model en gines since cylinder en gine inherently unbalanced Dick Mathis some time ago others have talked recommend rotating prop 180 degrees crankshaft seems vibrating too much pointed out 100 Model Aviation method counteracts basic im balance engine imbalance prop can say occasions have tried think have de tected slight lessening vibration coming through lines say have three-bladed pro peller Let tell about time 73 FAI tryouts Bill Werwage convinced three-bladed prop needed some sort balancing should have seen trials heard com ments flying Bill Gieseke McDonald Gialdini few others tried figure out balance three-bladed prop hysterical few words general about propellers Regarding pitch numbers stamped blade usually measurement 75 percent distance hub tip about average pitch since outer 25 percent blade displaces about much air inner 75 percent least thats what Harry Hig ley carrier engine fame says wont go measuring pitch two reasons dont have pitch gauge think average flier better off trying several different stock props varying diameters pitches blade thick nesses before trying customize prop other balancing Some basics diameter pitch diameter helps turning ability maneu verability pitch helps speed generalities change 10-5 10-6 same rpm plane should go faster switch regular blade W EW probably will get noticeably line tension ever plane probably will speed up round loops Wider blades will put load engine have heavy airplane may prone wearing out engine However Les Mc Donald feels generally speaking heavy airplane 35 engine best prop would 10-6W larger 46-size airplane heavy 56 62 oz try 11-6 EW Top flute 12-6 maple prop wide blade least guarantees line tension can wonders confidence flying Three comments Les made recent Model Aviation article Stiletto re garding prop trimming should elabora ted bit Sanding airfoil tips gives some added line tension also gives tendency speed up con secutive maneuvers performed sanding back side blade rolled up piece sandpaper create airfoil effect like add ing pitch makes tip bite air slight ellipse tip planform lets prop unload smoother square corner expense some line ten sion Rounding squaredoff tips instance Zinger Rev-Up prop keeps blades biting much air plane doesnt jump around corners much Rounding leading edge gives vertical power slows down model tight turn Sanding leading edge prop will keep cutting air will drag engine will break sooner two-cycle instance upwind side wingover Good prop care feeding Dont fly chipped ragged prop have heard some fliers rub epoxy tips keep chipping sand off varnish balancing prepared have fuel soak wood again unbalance prop After balancing rub two thin coats clear balance again Les hobby salesman suggests end up prop extremely out balance take back shop ask exchange hobby dealer should return manufacturer sidelight theory writers main reasons getting such better maneuvering airplanes last couple years longer span stabi lizers elevators working surface out propeller slipstream slipstream can have powerful effect flight model especially have super-hog engine turning paddle blade Supertigre 46 have seen everything 10-6 right 11-7 Zinger Bob Baron 11-6 Rev-up 12-6 Top Flite 12-6 Rev-Up 13-5 think its matter pays nickel takes choice have airplane trimmed out tip weight February 1978 101 Please send _________ copies new third edition Radio Control Buyers Guide Enclosed $500 copy ordered $425 Guide plus $75 postage handling 3-book boxed set covers fastest racing machines 3 4 5-view scale drawings color schemes markings construc tion performance data pilots race results descriptive illustrated story 22 Unlimiteds 41 Formula ls 19 Sport Biplanes 6 AT6/SNJs current era plus over 90 great Thomp son Bendix Greve Goodyear racers 3Ds 40s plus fabulous S chneider Cup floatlanes oithe 20s Pulitzer Racers Gordon ennett Racers lamous European racers way back tirst air race win ner 1909 Curtiss Golden Flyer- IJtIA 234 planes all pIIt Quality printed 192 big B/s 5 11 pages trul fine reference POSTAGE tour aviation bra ry Oder yours INCLUDED O Early Air Racers 3-views 1909-29 o National Air Racers 3-views 29-49 O ModernAirRacersina-views 4975 495 495 495 Send Check Money Order PUBLICATIONS P0 505 2726 SEPT IOCHESTEE SEW 6036 14626 RETURN MAIL DELIVERY Name Street City StateZip leadouts flap bending nose weight line length handle spacing select about five six good different props spend about two weeks 20-40 flights switching props Keep notes Its easy forget after two three switches Some prop combinations 35-size engines flying Foxes have using following Giesekeplane 525 sq 40 oz Rev-up 10-6W Tom Dixon 9th FAT tryoutsplane 560 sq 45 oz Rev-up 10-6W Fast Richard Mathis 13th Natsplane 525 sq 41 oz Grish 3-blade Joe Musumeci 2nd Senior NatsRev up 10-6W Using Max 35 have Remel Cooper 7th FAIplane 625 sq 46 oz Rev-up 10-6W Dave Hem strought 10th FAI plane 630 sq 53 oz Rev-up 10-6 EW Dennis Adamisin FAI 13thplane 580 sq 47 oz Rev-up 10-6EW David Fitzgerald 1st Senior Natsplane stock Sig Chipmunk 42 oz Zinger 10-6 pilots using 40 engines have using Norm Whittle 9th Nats plane weighs 55 oz Rev-up 10-6W Paul Walker 14th Nats 640 sq plane 49 oz Rev-up 10-6 Zinger 10-6 Roger Barrett 15th Nats 550 sq plane 455 oz. Rev-up l0-6EW Tom Lay 19th Nats680 sq plane 49 os Rev-up 10-6W Steve McCann 20th Nats plane 550 sq 48 oz Rev-up 10-6 Lets forget Half-As Nats champion Bob Whitely used Cox 6-3 gray prop TD 051 plane weighing 10 oz 210 sq wing 76 Bob smaller 170 sq wtng same weight used Cox 55-4 prop David Fitzgerald won Senior Half-A using Pinto Dick Mathis design weighing 12 oz 34 span Cox 6-3 prop TD 049 information stunt PAMPA write Wynn Paul 1640 Maywick Dr Lexington KY 40504 FF Sport Scale/Kuenz continued page 55 sells soul evil duo happily fine features model scale builder As far concerned must OK skysters about draw backs mentioned earlier does illusionist handle distorts truth subtle changes result nothing grotesque deformed admirable representation real mach ine capable good performance free flight guess biggest drawback cause resultant misery model has times scale horse power prop size order get up stairs Because scale effect no in-flight control other alterations scale configuration necessary gain stability dihedral must increased model like Spirit St Louis done minimum destroy appearance Anyhow flat wing dihedral looks like droops bit added actually improves appearance High-wing cabin jobs like Spirit have inherent stability no need excessive dihedral sleek sky-slicing low-wingers another bag low-wing design has wing tapered planform luck Dihedral angles less noticeable tapered wing constant chord wing Cut tapered wing out card stock another constant chord wing well Give tapered wing half again much di hedral constant chord jobbie eyeball em different angles will seem wing has no dihedral other except view head An illusion Tiny tail feathers another bug-a-boo scale modelers couple ways approaching drawback course enlarge stabilizer good taste Dont pull Charlie Tuna simply add -in around perimeter destroying aspectratio changing appearance stab aspect-ratio must taken consideration enlarging tail stabilizer want enlarge has aspect-ratio six-to-one aspect-ratio relation average chord span enlargement must same ratio say add -in chord six times 1-in must added span preserves ap pearance efficient enlarg ing changing proportion have created illusion unaltered tail large extent Another method combines two subtle alterations scale configuration wash out wing tips mono plane will cover bipes multiplanes later washing out tips center section stalls first tips still lifting keep ship stall ing completely nose lowers flying speed regained assume rib-slicers know wash-out re duced incidence wing approach es tips performed during building later warping additional alteration scale stretch fuselage Haw-w-w-w Yeah use Pirelli longerons just Naw am kiddin course mean increase tail moment building little extra length fuselage aft wing trailing edge stern post Such change usually has drawn redrawn few times get good balance between what looks OK maximum stretch can add no set rule procedure skysters must use engineering intuitivity Igor Sikorsky called such things fuselage stretching must sometimes done stabilizer area en larged because gap between trail ing edge wing leading edge stabilizer has consequently shrunk worst tussle system ever experienced design Farman Jabiru Transport teeny stab enlarged quite bit thereby reducing distance between wing stab meant fuselage stretched Tissue trimmers must have redrawn fuselage half dozen times before suita ble balance arrived did destroy dumpy appearance Farman fuselage Part fun rubber scale modeling right fellas no such thing model tough build Some just take longer others thats Overcoming small stabilizer area bipe easy ground-looping Spad Decalage answer setting wings different angles incidence rela tive other have read few differ ing methods setting up biplanes lately 102 ModelAviation MORRISONSCALE DRAWINGS EPLA-TECHCATALOG 25c nlerIWt/OflG/ 48500 McKenzie Hwy Vida Oregon 97483 Charles Mendenhall