The author former Nationals CombatChampion hastaken home hardware three out five Natato date has won 80% local meets has entered Consistent equipment positive mental attitude keys success mention well-designed/trimmed airplane IN MY beginning days Combat Voodoo performance plane good stock form however sought higher level started experiment During first two years development ensuing modified Voodoos quite successful local regional national competition Now after seven cumulative years evolu tionary work Voodoos great-grandson no longer gives clues its family ancestry Super Voodoo completely different its forebearer way Super Voodoos design concept focuses competition practicality sacrificing thing Combat maneuvering ability easily said difficult achieve design parameter Super Voodoo satisfies de sired goal through careful research application proven aerodynamic theories plane scientifically designed thoroughly engineered Bill Netzeband premier geniuses Control Line aeronautics aided immensely pearls wisdom After reviewing published articles no easy task itselfl after eight-hours-a-day question answer sessions after explanations re-explanations data sheets cover just about everything Control Line aerodynamics Super Voodoo slowly started form drawing board Lets take peek Wing top view ultimate layout would leading trailing edges would taper towards other tip such way center-of-pressure would located quarter-chord point along span compared non-tapered rectangular wing tapered layout locates mean aerodynamic center wing half closer planes center line reduces stress concentrations bear directly planes center structure Sweeping trailing edge forward tip leaving leading edge straight progres sively moves center-of-pressure forward much CL Combat piloting ability much plane know would answer question top pilot flying top plane then. Super Voodoo carefully thought out proven contests_ 40 Model Aviation FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 3/B 3/4 MAPLE MOTOR OERATS~\ VR PLY MOTOR MAlAY DOLBIEB ENONIE SHOWN III I/1B HARD BALSA TRAILING EDGE VR PLY L E OGOPLER 0 PLYWOGO REUIIRANK MT 3/B 3/4 MAPLE MOTOR MOIATS 3/R BALSA TRBI OUT TO FIT LE OF WING NESIC AWE HJSIIROO~ CLOYR REINFORCEMENT7 K NED UROR BALSA LEADRAG ODOR STOOl IIFIi 1-ffi 1116 PLY OOEIORS HO BALSA BOOM VB BRASH TUBING S32 MEDIC WIRE / VB lABOR BALSA STAWLATOR K Ii WING RWD-I/IB MED MO BALSA B REGO CENTER BA- MED ME BALSA TRIM FOR LE DSAWBB TRW F MOLCRRME MANY JFALOR RIB VOMED HO BALSA BOOR- 2 PLY DOWLORS REdO SLAEY VOODOO DESIGNED S DRAWN BY 30W4 JO TRACING BY JOE CEMBRCO wing center line tip can produce sudden unwanted glitches Super Voodoos rectangular wing also keeps its center-of-pressure along quarter chord however layout builds up stress wings center structure due panels outwardly displaced mean aerodynamic center Fortunately extra stress easily compensated construction technique Strong Sig leading edge stock two-ounce density per 36-in length integral five-ply doubler keep wing intact Trailing edge stock should very hard balsa complement leading edge components keeping wing together Inci dentally plastic coverings contribute virtually nothing structural integrity Wing side view has lot conjec ture concerning airfoil design relatively low speed 90-110 mph aircraft have seen everything Combat design sharp leading edge rapier airfoil blunt leading edge blimp airfoil former would suited hypersonic moon shots latter would quite happy leisurely balloon February 1981 41 V4 SOFT BALSA AlNO TIPS ___________________ VW NED ME BALSA BS PLY RELLCRAIAO MYALA PEWI HP WEBABIS ALOM MACWEB CANlABOR AS NEERED IW BRASS SIRING WILLCRAME-F A FALSE RIB VBSOFT BALSA FIEDIBAE LEADOIJTS IMED MO BALSA RIB VA PLY POARIUG GAADE LY6 PLY DEDALERSPUGARGORYLON ALEROR AWARE LEAORE EDREAND 5 BEaCRANOVB BALSA YE Unelncfl center rib integral belicrank mount allows easy checking maintenance complete control system Frayed flex ible leads worn bellcrank holes either indicate need replacementl can seen readily through clear iron-on covering Author uses Fascal latest miracle adhesives such Hot Stuff epoxy Super Voodoo builds fast faster other plane Once parts cut out plane can built couple hours race Through unprejudicial testing has found airfoil selection speed type aircraft really critical Just remem ber airfoil neither too blunt nor sharp leading edge has 12-18% maximum thickness high point located between 2030% chord airfoil has enough potential job hand airfoil Super Voodoo magical modified St Cyr 172 has 135% maximum thickness 30% chord model 3874-in span 646-in chord St Cyr 172 airfoil tested wind tunnel 90mph velocity results showed lift coefficient approaching 10 20/1 lift/drag ratio airfoils center pressure stayed 25% chord throughout lift curve St Cyr 172 displayed non-violent stall characteristics Id like pass inter esting fact St Cyr airfoils designed tested 1925 As saying goes New news reintroduced old news Heres multiple choice Which two correct answers two important factors Combat design wing loading b power loading c span loading d trim e aspect ratio 0 prop nut g above After careful reviewing determined correct answers d Lets take former first Brass tubing spacers nylon aileron bush ing promotes long trouble-free hinge life Sys tem eliminates wear stabilator surface boom hinges side loads Wing loading Through experimentation maximum wing loading winning performance very close 15 sq per oz wing loading can obtained building kit Voodoo all-up weight including fuel exactly 22 oz stock Voodoo has 330 sq wing area contrast 17-oz Super Voodoo 3562 sq computes 203 sq per oz wing loading roughly 35% favorable first example regards wing loading just remember 15 sq peroz adequate 20 sq per oz gravy Trim whats Trim has nothing getting haircut unless plane trimmed incorrectly may bank towards center circle close shave haircut Proper trimming Voodoo Combat craft accomplished through use pins pin point accuracy Note Super Voodoos center gravity CG position plans Push strong straight pins such pins part way wing tips exactly opposite CG position shown plans CG isnt correct until model remains level supported finger tips under shafts pins Super Voodoo requires exact location maximum performance An eighth-inch ward placement CG Super Voodoos ideal spot turns aircraft smooth-turning bomber highly maneuver able fighter performance make sure planes CG exactly shown plans Unless like helplessly watch Free Flight move CG further rearward will have no Continued page 118 42 Model Aviation Pacifier compartment Location see plan does change pitch-axis CO An added bonus pacifier system doesnt dis place lateral CG outward much long surgical tubing bladder Important advantage open engine pod compared enclosed type lower crankcase cooling bettergiving steadier needle settings Super Voodoos engine pod covered glass cloth resin builds faster still offers exceptional strength once-proud craft would ever again look like airplane let alone fly should never underestimate ambi tion blind optimism vintage airplane fan 1972 remaines Mew Gull purchased Formula race-pilot/builder Tom Storey Martin Barraclough long expensive process making something out almost nothing begun hard draw distinct line between restoring wreck ends building entirely new airplane begins project must surely have straddled such line six years worked replacing rotten old wood strong new wood replacing cracked discolored plexiglass clear new panels installing new controls instruments other parts make new Mew Gull look like first raced last April 16 1978 Mew Gull took off Redhill Aerodrome home Tiger Club first time 13 years Percival Mew Gull English skies Two months later Mew Gull performed Old Warden showing off its famous lines thousands appreciative fans zoomed just few feet above grass runway roared through steeply banked pylon turns No longer did lovers old-time racing have use imaginations reading Mew Gulls exploits look listen past become present wasnt jut nostalgia Later season Thruxton Tom Storey climbed roomy cockpit buckled up waited starter swing little green flag race time again Forty-one years after Alex Henshaw first raced EXF Kings Cup Tom Storey did same didnt win could because handicapper good memory amazing speeds airplane clocked Kings Cup Races long ago Mew Gull raced again. will race yet again what Edgar Percival meant words late Doug Bianchi just goes show aeroplane comes good family properly brought up have good chance getting home piece Mew Gull G-AEXF once piece lovely piece sincere thanks priceless research Maurice Marsh Air Racing Specialist Air Britain International Society Aviation Historians Super Voodoo/Jo Continued page 42 control Trim line rake Proper line rake has computed via formula flight-adjusted minimum aircraft speed 90 mph build line rake 120-mph speeds will suffer decreased line tension soon plane lifts off streamer full streamer can slow down Fast Combat plane almost 10 mph build excessive line rake will waste engine efficiency directing power outwards Proper line rake computed 90-mph minimum Combat speed because observa tions five Nationals date varying contest locales observed under average atmospheric conditions top Combat fliers usually turning 90-100 mph Under ideal atmospheric conditions same fliers upped speeds 100-110 mph region Poor atmospheric conditions dropped speeds 80-90 mph range flights full streamer flights accurately timed data little interpolation can see selected 90 mph minimum Combat speed compute line rake Before go next area trim heres tip use find true air speed Combat plane flying absolutely level Step 1 Note angle between lines ground Step 2 Look up cosine angle multiply apparent speed plane get true speed Example clocked plane flying 45 degrees planes apparent speed 100 mph speed charts assume plane remains level during clocking case plane wasnt level its chart speed true speed apparent speed get true speed multiply cosine angle plane flying cosine 45 degrees 707 apparent speed 100 mph l00times 707 equals 707 mph true speed plane flying 25 degrees cosine 25 degrees 906 true air speed would 100 times 906 906 mph cosine values used examples two popular angles Combat pilots cruise planes waiting opponents become airborne cosine values 45- 25-degree angles can rounded off 7 9 respectively easy multiplica tion less 1% error true air speed Memorization two angles values could future use contest field Trim wing offset Because outboard wing travels faster inboard wing lift center Control Line aircraft same its geometric center proper amount wing offset trim needed Super Voodoo precisely calculated found 118 Mode Aviation Super Voodoos wing lift center laterally located 312-in outboard geometric center wing plans show wing lift centers lateral reference point engine thrust line Trim CG-offset-from-thrust-line plans show lateral CG displaced 250-in outboard engine thrust line CG offset-from-thrust-line distance precisely cal culated too Trim Stabilator Most Combat pilots would probably prefer exact amount stabilator movement produce minimum radius turns speed loss Super Voodoo figure 16 degrees direction Personally prefer 24 degrees up down movement stabilator 50% stabilator move ment needed CG per plan certain situations use extra stabilator movement advantage sacrificing little speed gain tighter turn Trim control system Use favorite method suit timing Personally prefer set up control system degree ofbellcrank movement produces degree stabilator movement extremely fast-reacting setup within wing however adjust planes internal control system externally reducing line spacing handle until plane flies perfectly eye-mind-hand rhythm What happens extensive trimming done done properly Super Voodoo will have its drag center line wing lift center thrust line hence plane will react positively command giving no surprises pilot allows full concentraion winning match Performance 50% nitro-methane 8-in pitch epoxy-fiber prop flying couple feet off deck speed pylon Super Voodoo has attained 126 mph Fox Combat Special 121 mph Fox 36XBB both engines retimed freed fitted special rear bearings Timing seven level laps exactly 60-ft lines Now comes big Combat tip 50% nitro 8-in pitch props flying level 60-ft lines have lost matches have won want win try combination 10-15% nitro-methane 9-6 Rev-Up 9-6 Top Flite prop ever fly level unless attacking use 60-ft 5-in lines added reach Using 1 2% nitro fuel 9-6 prop Super Voodoos Combat speed streamer 114 mph Fox Combat Special 109 mph Fox 36XBB enough performance consistently win Building outline Epoxy plywood doubler leading edge Pin down trailing edge flat building board Instant-glue Hot Stuff etc tip ribs trailing leading edges finish instant gluing other ribs place except center rib plywood bellcrank mount installed epoxy center rib trailing leading edges Go over instantglue joints epoxy epoxy upper trailing edge place Glue wing tips Build up motor mount single unit cut Out appropriately leading edge center rib clearance Epoxy motor mount unit wing Epoxy plywood doublers both sides x 9-in boom blank Cut out monoboom sandwich Cut Out stabilator very hard balsa Using Klett aileron hinge 3/32-in wire -in brass tubing cloth join stabilator boom epoxy boom unit wing After pushrod leadout guides epoxied install controls Install fuel system Cover wing using Fascal Fuel-proof exposed wood parts Drill holes engine streamer move engine fore aft achieve correct CG place ment Using wing-tip weight balance correct lateral CG Super Voodoo ready flight Final note Whether youre new Combat expert flier sincerely hope have learned something use article Have fun Combat circle SAFE FLYING IS NO ACCIDENT 175 T RWheels 1 -3/4$240 Pair 200 T RWheels 2$260 Pair 2 25 T R SWheels 2-1/4$280 Parr 250 T R SWheels 2-1/2$300 Pair 275 T R SWheels 2-3/4$320 Pair 3 00 1 R SWheels 3$340 Parr 325 T RWheels 3-1/4$360 Pair 3 50 T RWheels 3-1/2$380 Pair NEW! NEW! NEW! LINE STARTER BOX FLIGHT THE DELUXE Completely Assembled Compact t Perfect Competitor Holds 12v Battery Power Panel Rack Starter ALSO New Drawer Storage Only $1495 information write call The1Bgx491~l Pike F1iht Lancaster PA 17604 Ph 717 291 2136 B uXDealer Inquiries Invited CL Speed/Hempel Con finued page 46 MACA newsletter enjoyed very much Combat fliers very interested rework ing engines just like Speed fliers Maybe can share some knowledge Combat fliers vice versa Received letter Les Baer Sr concerning Evert Gray Memorial Speed Bash held Allentown PA October 5 reports contest went very well temperature little cool high 640F sunny day low humidity hardly wind turnout excellent kept everyone busy whole time Nick Sher started day off breaking February 1981 119 SMOOTH R SLICKS 5TREAD T low bounce shock absorbing wheels feature new nylon metalic finish wheel hubs wheel pairs e matched mness quality balance DU-BRO PRODUCTS INC 480 BONNER RD WAUCONDA ILL 60084 New 1/4 SCALE 1918 NIEUPORT 38 C-i additional information WW 1 classic catalogue send $100 PROCTOR ENTERPRISES CORP PO eox 9641 San Diego CA 92109
Edition: Model Aviation - 1981/02
Page Numbers: 40, 41, 42, 118, 119
The author former Nationals CombatChampion hastaken home hardware three out five Natato date has won 80% local meets has entered Consistent equipment positive mental attitude keys success mention well-designed/trimmed airplane IN MY beginning days Combat Voodoo performance plane good stock form however sought higher level started experiment During first two years development ensuing modified Voodoos quite successful local regional national competition Now after seven cumulative years evolu tionary work Voodoos great-grandson no longer gives clues its family ancestry Super Voodoo completely different its forebearer way Super Voodoos design concept focuses competition practicality sacrificing thing Combat maneuvering ability easily said difficult achieve design parameter Super Voodoo satisfies de sired goal through careful research application proven aerodynamic theories plane scientifically designed thoroughly engineered Bill Netzeband premier geniuses Control Line aeronautics aided immensely pearls wisdom After reviewing published articles no easy task itselfl after eight-hours-a-day question answer sessions after explanations re-explanations data sheets cover just about everything Control Line aerodynamics Super Voodoo slowly started form drawing board Lets take peek Wing top view ultimate layout would leading trailing edges would taper towards other tip such way center-of-pressure would located quarter-chord point along span compared non-tapered rectangular wing tapered layout locates mean aerodynamic center wing half closer planes center line reduces stress concentrations bear directly planes center structure Sweeping trailing edge forward tip leaving leading edge straight progres sively moves center-of-pressure forward much CL Combat piloting ability much plane know would answer question top pilot flying top plane then. Super Voodoo carefully thought out proven contests_ 40 Model Aviation FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 3/B 3/4 MAPLE MOTOR OERATS~\ VR PLY MOTOR MAlAY DOLBIEB ENONIE SHOWN III I/1B HARD BALSA TRAILING EDGE VR PLY L E OGOPLER 0 PLYWOGO REUIIRANK MT 3/B 3/4 MAPLE MOTOR MOIATS 3/R BALSA TRBI OUT TO FIT LE OF WING NESIC AWE HJSIIROO~ CLOYR REINFORCEMENT7 K NED UROR BALSA LEADRAG ODOR STOOl IIFIi 1-ffi 1116 PLY OOEIORS HO BALSA BOOM VB BRASH TUBING S32 MEDIC WIRE / VB lABOR BALSA STAWLATOR K Ii WING RWD-I/IB MED MO BALSA B REGO CENTER BA- MED ME BALSA TRIM FOR LE DSAWBB TRW F MOLCRRME MANY JFALOR RIB VOMED HO BALSA BOOR- 2 PLY DOWLORS REdO SLAEY VOODOO DESIGNED S DRAWN BY 30W4 JO TRACING BY JOE CEMBRCO wing center line tip can produce sudden unwanted glitches Super Voodoos rectangular wing also keeps its center-of-pressure along quarter chord however layout builds up stress wings center structure due panels outwardly displaced mean aerodynamic center Fortunately extra stress easily compensated construction technique Strong Sig leading edge stock two-ounce density per 36-in length integral five-ply doubler keep wing intact Trailing edge stock should very hard balsa complement leading edge components keeping wing together Inci dentally plastic coverings contribute virtually nothing structural integrity Wing side view has lot conjec ture concerning airfoil design relatively low speed 90-110 mph aircraft have seen everything Combat design sharp leading edge rapier airfoil blunt leading edge blimp airfoil former would suited hypersonic moon shots latter would quite happy leisurely balloon February 1981 41 V4 SOFT BALSA AlNO TIPS ___________________ VW NED ME BALSA BS PLY RELLCRAIAO MYALA PEWI HP WEBABIS ALOM MACWEB CANlABOR AS NEERED IW BRASS SIRING WILLCRAME-F A FALSE RIB VBSOFT BALSA FIEDIBAE LEADOIJTS IMED MO BALSA RIB VA PLY POARIUG GAADE LY6 PLY DEDALERSPUGARGORYLON ALEROR AWARE LEAORE EDREAND 5 BEaCRANOVB BALSA YE Unelncfl center rib integral belicrank mount allows easy checking maintenance complete control system Frayed flex ible leads worn bellcrank holes either indicate need replacementl can seen readily through clear iron-on covering Author uses Fascal latest miracle adhesives such Hot Stuff epoxy Super Voodoo builds fast faster other plane Once parts cut out plane can built couple hours race Through unprejudicial testing has found airfoil selection speed type aircraft really critical Just remem ber airfoil neither too blunt nor sharp leading edge has 12-18% maximum thickness high point located between 2030% chord airfoil has enough potential job hand airfoil Super Voodoo magical modified St Cyr 172 has 135% maximum thickness 30% chord model 3874-in span 646-in chord St Cyr 172 airfoil tested wind tunnel 90mph velocity results showed lift coefficient approaching 10 20/1 lift/drag ratio airfoils center pressure stayed 25% chord throughout lift curve St Cyr 172 displayed non-violent stall characteristics Id like pass inter esting fact St Cyr airfoils designed tested 1925 As saying goes New news reintroduced old news Heres multiple choice Which two correct answers two important factors Combat design wing loading b power loading c span loading d trim e aspect ratio 0 prop nut g above After careful reviewing determined correct answers d Lets take former first Brass tubing spacers nylon aileron bush ing promotes long trouble-free hinge life Sys tem eliminates wear stabilator surface boom hinges side loads Wing loading Through experimentation maximum wing loading winning performance very close 15 sq per oz wing loading can obtained building kit Voodoo all-up weight including fuel exactly 22 oz stock Voodoo has 330 sq wing area contrast 17-oz Super Voodoo 3562 sq computes 203 sq per oz wing loading roughly 35% favorable first example regards wing loading just remember 15 sq peroz adequate 20 sq per oz gravy Trim whats Trim has nothing getting haircut unless plane trimmed incorrectly may bank towards center circle close shave haircut Proper trimming Voodoo Combat craft accomplished through use pins pin point accuracy Note Super Voodoos center gravity CG position plans Push strong straight pins such pins part way wing tips exactly opposite CG position shown plans CG isnt correct until model remains level supported finger tips under shafts pins Super Voodoo requires exact location maximum performance An eighth-inch ward placement CG Super Voodoos ideal spot turns aircraft smooth-turning bomber highly maneuver able fighter performance make sure planes CG exactly shown plans Unless like helplessly watch Free Flight move CG further rearward will have no Continued page 118 42 Model Aviation Pacifier compartment Location see plan does change pitch-axis CO An added bonus pacifier system doesnt dis place lateral CG outward much long surgical tubing bladder Important advantage open engine pod compared enclosed type lower crankcase cooling bettergiving steadier needle settings Super Voodoos engine pod covered glass cloth resin builds faster still offers exceptional strength once-proud craft would ever again look like airplane let alone fly should never underestimate ambi tion blind optimism vintage airplane fan 1972 remaines Mew Gull purchased Formula race-pilot/builder Tom Storey Martin Barraclough long expensive process making something out almost nothing begun hard draw distinct line between restoring wreck ends building entirely new airplane begins project must surely have straddled such line six years worked replacing rotten old wood strong new wood replacing cracked discolored plexiglass clear new panels installing new controls instruments other parts make new Mew Gull look like first raced last April 16 1978 Mew Gull took off Redhill Aerodrome home Tiger Club first time 13 years Percival Mew Gull English skies Two months later Mew Gull performed Old Warden showing off its famous lines thousands appreciative fans zoomed just few feet above grass runway roared through steeply banked pylon turns No longer did lovers old-time racing have use imaginations reading Mew Gulls exploits look listen past become present wasnt jut nostalgia Later season Thruxton Tom Storey climbed roomy cockpit buckled up waited starter swing little green flag race time again Forty-one years after Alex Henshaw first raced EXF Kings Cup Tom Storey did same didnt win could because handicapper good memory amazing speeds airplane clocked Kings Cup Races long ago Mew Gull raced again. will race yet again what Edgar Percival meant words late Doug Bianchi just goes show aeroplane comes good family properly brought up have good chance getting home piece Mew Gull G-AEXF once piece lovely piece sincere thanks priceless research Maurice Marsh Air Racing Specialist Air Britain International Society Aviation Historians Super Voodoo/Jo Continued page 42 control Trim line rake Proper line rake has computed via formula flight-adjusted minimum aircraft speed 90 mph build line rake 120-mph speeds will suffer decreased line tension soon plane lifts off streamer full streamer can slow down Fast Combat plane almost 10 mph build excessive line rake will waste engine efficiency directing power outwards Proper line rake computed 90-mph minimum Combat speed because observa tions five Nationals date varying contest locales observed under average atmospheric conditions top Combat fliers usually turning 90-100 mph Under ideal atmospheric conditions same fliers upped speeds 100-110 mph region Poor atmospheric conditions dropped speeds 80-90 mph range flights full streamer flights accurately timed data little interpolation can see selected 90 mph minimum Combat speed compute line rake Before go next area trim heres tip use find true air speed Combat plane flying absolutely level Step 1 Note angle between lines ground Step 2 Look up cosine angle multiply apparent speed plane get true speed Example clocked plane flying 45 degrees planes apparent speed 100 mph speed charts assume plane remains level during clocking case plane wasnt level its chart speed true speed apparent speed get true speed multiply cosine angle plane flying cosine 45 degrees 707 apparent speed 100 mph l00times 707 equals 707 mph true speed plane flying 25 degrees cosine 25 degrees 906 true air speed would 100 times 906 906 mph cosine values used examples two popular angles Combat pilots cruise planes waiting opponents become airborne cosine values 45- 25-degree angles can rounded off 7 9 respectively easy multiplica tion less 1% error true air speed Memorization two angles values could future use contest field Trim wing offset Because outboard wing travels faster inboard wing lift center Control Line aircraft same its geometric center proper amount wing offset trim needed Super Voodoo precisely calculated found 118 Mode Aviation Super Voodoos wing lift center laterally located 312-in outboard geometric center wing plans show wing lift centers lateral reference point engine thrust line Trim CG-offset-from-thrust-line plans show lateral CG displaced 250-in outboard engine thrust line CG offset-from-thrust-line distance precisely cal culated too Trim Stabilator Most Combat pilots would probably prefer exact amount stabilator movement produce minimum radius turns speed loss Super Voodoo figure 16 degrees direction Personally prefer 24 degrees up down movement stabilator 50% stabilator move ment needed CG per plan certain situations use extra stabilator movement advantage sacrificing little speed gain tighter turn Trim control system Use favorite method suit timing Personally prefer set up control system degree ofbellcrank movement produces degree stabilator movement extremely fast-reacting setup within wing however adjust planes internal control system externally reducing line spacing handle until plane flies perfectly eye-mind-hand rhythm What happens extensive trimming done done properly Super Voodoo will have its drag center line wing lift center thrust line hence plane will react positively command giving no surprises pilot allows full concentraion winning match Performance 50% nitro-methane 8-in pitch epoxy-fiber prop flying couple feet off deck speed pylon Super Voodoo has attained 126 mph Fox Combat Special 121 mph Fox 36XBB both engines retimed freed fitted special rear bearings Timing seven level laps exactly 60-ft lines Now comes big Combat tip 50% nitro 8-in pitch props flying level 60-ft lines have lost matches have won want win try combination 10-15% nitro-methane 9-6 Rev-Up 9-6 Top Flite prop ever fly level unless attacking use 60-ft 5-in lines added reach Using 1 2% nitro fuel 9-6 prop Super Voodoos Combat speed streamer 114 mph Fox Combat Special 109 mph Fox 36XBB enough performance consistently win Building outline Epoxy plywood doubler leading edge Pin down trailing edge flat building board Instant-glue Hot Stuff etc tip ribs trailing leading edges finish instant gluing other ribs place except center rib plywood bellcrank mount installed epoxy center rib trailing leading edges Go over instantglue joints epoxy epoxy upper trailing edge place Glue wing tips Build up motor mount single unit cut Out appropriately leading edge center rib clearance Epoxy motor mount unit wing Epoxy plywood doublers both sides x 9-in boom blank Cut out monoboom sandwich Cut Out stabilator very hard balsa Using Klett aileron hinge 3/32-in wire -in brass tubing cloth join stabilator boom epoxy boom unit wing After pushrod leadout guides epoxied install controls Install fuel system Cover wing using Fascal Fuel-proof exposed wood parts Drill holes engine streamer move engine fore aft achieve correct CG place ment Using wing-tip weight balance correct lateral CG Super Voodoo ready flight Final note Whether youre new Combat expert flier sincerely hope have learned something use article Have fun Combat circle SAFE FLYING IS NO ACCIDENT 175 T RWheels 1 -3/4$240 Pair 200 T RWheels 2$260 Pair 2 25 T R SWheels 2-1/4$280 Parr 250 T R SWheels 2-1/2$300 Pair 275 T R SWheels 2-3/4$320 Pair 3 00 1 R SWheels 3$340 Parr 325 T RWheels 3-1/4$360 Pair 3 50 T RWheels 3-1/2$380 Pair NEW! NEW! NEW! LINE STARTER BOX FLIGHT THE DELUXE Completely Assembled Compact t Perfect Competitor Holds 12v Battery Power Panel Rack Starter ALSO New Drawer Storage Only $1495 information write call The1Bgx491~l Pike F1iht Lancaster PA 17604 Ph 717 291 2136 B uXDealer Inquiries Invited CL Speed/Hempel Con finued page 46 MACA newsletter enjoyed very much Combat fliers very interested rework ing engines just like Speed fliers Maybe can share some knowledge Combat fliers vice versa Received letter Les Baer Sr concerning Evert Gray Memorial Speed Bash held Allentown PA October 5 reports contest went very well temperature little cool high 640F sunny day low humidity hardly wind turnout excellent kept everyone busy whole time Nick Sher started day off breaking February 1981 119 SMOOTH R SLICKS 5TREAD T low bounce shock absorbing wheels feature new nylon metalic finish wheel hubs wheel pairs e matched mness quality balance DU-BRO PRODUCTS INC 480 BONNER RD WAUCONDA ILL 60084 New 1/4 SCALE 1918 NIEUPORT 38 C-i additional information WW 1 classic catalogue send $100 PROCTOR ENTERPRISES CORP PO eox 9641 San Diego CA 92109
Edition: Model Aviation - 1981/02
Page Numbers: 40, 41, 42, 118, 119
The author former Nationals CombatChampion hastaken home hardware three out five Natato date has won 80% local meets has entered Consistent equipment positive mental attitude keys success mention well-designed/trimmed airplane IN MY beginning days Combat Voodoo performance plane good stock form however sought higher level started experiment During first two years development ensuing modified Voodoos quite successful local regional national competition Now after seven cumulative years evolu tionary work Voodoos great-grandson no longer gives clues its family ancestry Super Voodoo completely different its forebearer way Super Voodoos design concept focuses competition practicality sacrificing thing Combat maneuvering ability easily said difficult achieve design parameter Super Voodoo satisfies de sired goal through careful research application proven aerodynamic theories plane scientifically designed thoroughly engineered Bill Netzeband premier geniuses Control Line aeronautics aided immensely pearls wisdom After reviewing published articles no easy task itselfl after eight-hours-a-day question answer sessions after explanations re-explanations data sheets cover just about everything Control Line aerodynamics Super Voodoo slowly started form drawing board Lets take peek Wing top view ultimate layout would leading trailing edges would taper towards other tip such way center-of-pressure would located quarter-chord point along span compared non-tapered rectangular wing tapered layout locates mean aerodynamic center wing half closer planes center line reduces stress concentrations bear directly planes center structure Sweeping trailing edge forward tip leaving leading edge straight progres sively moves center-of-pressure forward much CL Combat piloting ability much plane know would answer question top pilot flying top plane then. Super Voodoo carefully thought out proven contests_ 40 Model Aviation FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 3/B 3/4 MAPLE MOTOR OERATS~\ VR PLY MOTOR MAlAY DOLBIEB ENONIE SHOWN III I/1B HARD BALSA TRAILING EDGE VR PLY L E OGOPLER 0 PLYWOGO REUIIRANK MT 3/B 3/4 MAPLE MOTOR MOIATS 3/R BALSA TRBI OUT TO FIT LE OF WING NESIC AWE HJSIIROO~ CLOYR REINFORCEMENT7 K NED UROR BALSA LEADRAG ODOR STOOl IIFIi 1-ffi 1116 PLY OOEIORS HO BALSA BOOM VB BRASH TUBING S32 MEDIC WIRE / VB lABOR BALSA STAWLATOR K Ii WING RWD-I/IB MED MO BALSA B REGO CENTER BA- MED ME BALSA TRIM FOR LE DSAWBB TRW F MOLCRRME MANY JFALOR RIB VOMED HO BALSA BOOR- 2 PLY DOWLORS REdO SLAEY VOODOO DESIGNED S DRAWN BY 30W4 JO TRACING BY JOE CEMBRCO wing center line tip can produce sudden unwanted glitches Super Voodoos rectangular wing also keeps its center-of-pressure along quarter chord however layout builds up stress wings center structure due panels outwardly displaced mean aerodynamic center Fortunately extra stress easily compensated construction technique Strong Sig leading edge stock two-ounce density per 36-in length integral five-ply doubler keep wing intact Trailing edge stock should very hard balsa complement leading edge components keeping wing together Inci dentally plastic coverings contribute virtually nothing structural integrity Wing side view has lot conjec ture concerning airfoil design relatively low speed 90-110 mph aircraft have seen everything Combat design sharp leading edge rapier airfoil blunt leading edge blimp airfoil former would suited hypersonic moon shots latter would quite happy leisurely balloon February 1981 41 V4 SOFT BALSA AlNO TIPS ___________________ VW NED ME BALSA BS PLY RELLCRAIAO MYALA PEWI HP WEBABIS ALOM MACWEB CANlABOR AS NEERED IW BRASS SIRING WILLCRAME-F A FALSE RIB VBSOFT BALSA FIEDIBAE LEADOIJTS IMED MO BALSA RIB VA PLY POARIUG GAADE LY6 PLY DEDALERSPUGARGORYLON ALEROR AWARE LEAORE EDREAND 5 BEaCRANOVB BALSA YE Unelncfl center rib integral belicrank mount allows easy checking maintenance complete control system Frayed flex ible leads worn bellcrank holes either indicate need replacementl can seen readily through clear iron-on covering Author uses Fascal latest miracle adhesives such Hot Stuff epoxy Super Voodoo builds fast faster other plane Once parts cut out plane can built couple hours race Through unprejudicial testing has found airfoil selection speed type aircraft really critical Just remem ber airfoil neither too blunt nor sharp leading edge has 12-18% maximum thickness high point located between 2030% chord airfoil has enough potential job hand airfoil Super Voodoo magical modified St Cyr 172 has 135% maximum thickness 30% chord model 3874-in span 646-in chord St Cyr 172 airfoil tested wind tunnel 90mph velocity results showed lift coefficient approaching 10 20/1 lift/drag ratio airfoils center pressure stayed 25% chord throughout lift curve St Cyr 172 displayed non-violent stall characteristics Id like pass inter esting fact St Cyr airfoils designed tested 1925 As saying goes New news reintroduced old news Heres multiple choice Which two correct answers two important factors Combat design wing loading b power loading c span loading d trim e aspect ratio 0 prop nut g above After careful reviewing determined correct answers d Lets take former first Brass tubing spacers nylon aileron bush ing promotes long trouble-free hinge life Sys tem eliminates wear stabilator surface boom hinges side loads Wing loading Through experimentation maximum wing loading winning performance very close 15 sq per oz wing loading can obtained building kit Voodoo all-up weight including fuel exactly 22 oz stock Voodoo has 330 sq wing area contrast 17-oz Super Voodoo 3562 sq computes 203 sq per oz wing loading roughly 35% favorable first example regards wing loading just remember 15 sq peroz adequate 20 sq per oz gravy Trim whats Trim has nothing getting haircut unless plane trimmed incorrectly may bank towards center circle close shave haircut Proper trimming Voodoo Combat craft accomplished through use pins pin point accuracy Note Super Voodoos center gravity CG position plans Push strong straight pins such pins part way wing tips exactly opposite CG position shown plans CG isnt correct until model remains level supported finger tips under shafts pins Super Voodoo requires exact location maximum performance An eighth-inch ward placement CG Super Voodoos ideal spot turns aircraft smooth-turning bomber highly maneuver able fighter performance make sure planes CG exactly shown plans Unless like helplessly watch Free Flight move CG further rearward will have no Continued page 118 42 Model Aviation Pacifier compartment Location see plan does change pitch-axis CO An added bonus pacifier system doesnt dis place lateral CG outward much long surgical tubing bladder Important advantage open engine pod compared enclosed type lower crankcase cooling bettergiving steadier needle settings Super Voodoos engine pod covered glass cloth resin builds faster still offers exceptional strength once-proud craft would ever again look like airplane let alone fly should never underestimate ambi tion blind optimism vintage airplane fan 1972 remaines Mew Gull purchased Formula race-pilot/builder Tom Storey Martin Barraclough long expensive process making something out almost nothing begun hard draw distinct line between restoring wreck ends building entirely new airplane begins project must surely have straddled such line six years worked replacing rotten old wood strong new wood replacing cracked discolored plexiglass clear new panels installing new controls instruments other parts make new Mew Gull look like first raced last April 16 1978 Mew Gull took off Redhill Aerodrome home Tiger Club first time 13 years Percival Mew Gull English skies Two months later Mew Gull performed Old Warden showing off its famous lines thousands appreciative fans zoomed just few feet above grass runway roared through steeply banked pylon turns No longer did lovers old-time racing have use imaginations reading Mew Gulls exploits look listen past become present wasnt jut nostalgia Later season Thruxton Tom Storey climbed roomy cockpit buckled up waited starter swing little green flag race time again Forty-one years after Alex Henshaw first raced EXF Kings Cup Tom Storey did same didnt win could because handicapper good memory amazing speeds airplane clocked Kings Cup Races long ago Mew Gull raced again. will race yet again what Edgar Percival meant words late Doug Bianchi just goes show aeroplane comes good family properly brought up have good chance getting home piece Mew Gull G-AEXF once piece lovely piece sincere thanks priceless research Maurice Marsh Air Racing Specialist Air Britain International Society Aviation Historians Super Voodoo/Jo Continued page 42 control Trim line rake Proper line rake has computed via formula flight-adjusted minimum aircraft speed 90 mph build line rake 120-mph speeds will suffer decreased line tension soon plane lifts off streamer full streamer can slow down Fast Combat plane almost 10 mph build excessive line rake will waste engine efficiency directing power outwards Proper line rake computed 90-mph minimum Combat speed because observa tions five Nationals date varying contest locales observed under average atmospheric conditions top Combat fliers usually turning 90-100 mph Under ideal atmospheric conditions same fliers upped speeds 100-110 mph region Poor atmospheric conditions dropped speeds 80-90 mph range flights full streamer flights accurately timed data little interpolation can see selected 90 mph minimum Combat speed compute line rake Before go next area trim heres tip use find true air speed Combat plane flying absolutely level Step 1 Note angle between lines ground Step 2 Look up cosine angle multiply apparent speed plane get true speed Example clocked plane flying 45 degrees planes apparent speed 100 mph speed charts assume plane remains level during clocking case plane wasnt level its chart speed true speed apparent speed get true speed multiply cosine angle plane flying cosine 45 degrees 707 apparent speed 100 mph l00times 707 equals 707 mph true speed plane flying 25 degrees cosine 25 degrees 906 true air speed would 100 times 906 906 mph cosine values used examples two popular angles Combat pilots cruise planes waiting opponents become airborne cosine values 45- 25-degree angles can rounded off 7 9 respectively easy multiplica tion less 1% error true air speed Memorization two angles values could future use contest field Trim wing offset Because outboard wing travels faster inboard wing lift center Control Line aircraft same its geometric center proper amount wing offset trim needed Super Voodoo precisely calculated found 118 Mode Aviation Super Voodoos wing lift center laterally located 312-in outboard geometric center wing plans show wing lift centers lateral reference point engine thrust line Trim CG-offset-from-thrust-line plans show lateral CG displaced 250-in outboard engine thrust line CG offset-from-thrust-line distance precisely cal culated too Trim Stabilator Most Combat pilots would probably prefer exact amount stabilator movement produce minimum radius turns speed loss Super Voodoo figure 16 degrees direction Personally prefer 24 degrees up down movement stabilator 50% stabilator move ment needed CG per plan certain situations use extra stabilator movement advantage sacrificing little speed gain tighter turn Trim control system Use favorite method suit timing Personally prefer set up control system degree ofbellcrank movement produces degree stabilator movement extremely fast-reacting setup within wing however adjust planes internal control system externally reducing line spacing handle until plane flies perfectly eye-mind-hand rhythm What happens extensive trimming done done properly Super Voodoo will have its drag center line wing lift center thrust line hence plane will react positively command giving no surprises pilot allows full concentraion winning match Performance 50% nitro-methane 8-in pitch epoxy-fiber prop flying couple feet off deck speed pylon Super Voodoo has attained 126 mph Fox Combat Special 121 mph Fox 36XBB both engines retimed freed fitted special rear bearings Timing seven level laps exactly 60-ft lines Now comes big Combat tip 50% nitro 8-in pitch props flying level 60-ft lines have lost matches have won want win try combination 10-15% nitro-methane 9-6 Rev-Up 9-6 Top Flite prop ever fly level unless attacking use 60-ft 5-in lines added reach Using 1 2% nitro fuel 9-6 prop Super Voodoos Combat speed streamer 114 mph Fox Combat Special 109 mph Fox 36XBB enough performance consistently win Building outline Epoxy plywood doubler leading edge Pin down trailing edge flat building board Instant-glue Hot Stuff etc tip ribs trailing leading edges finish instant gluing other ribs place except center rib plywood bellcrank mount installed epoxy center rib trailing leading edges Go over instantglue joints epoxy epoxy upper trailing edge place Glue wing tips Build up motor mount single unit cut Out appropriately leading edge center rib clearance Epoxy motor mount unit wing Epoxy plywood doublers both sides x 9-in boom blank Cut out monoboom sandwich Cut Out stabilator very hard balsa Using Klett aileron hinge 3/32-in wire -in brass tubing cloth join stabilator boom epoxy boom unit wing After pushrod leadout guides epoxied install controls Install fuel system Cover wing using Fascal Fuel-proof exposed wood parts Drill holes engine streamer move engine fore aft achieve correct CG place ment Using wing-tip weight balance correct lateral CG Super Voodoo ready flight Final note Whether youre new Combat expert flier sincerely hope have learned something use article Have fun Combat circle SAFE FLYING IS NO ACCIDENT 175 T RWheels 1 -3/4$240 Pair 200 T RWheels 2$260 Pair 2 25 T R SWheels 2-1/4$280 Parr 250 T R SWheels 2-1/2$300 Pair 275 T R SWheels 2-3/4$320 Pair 3 00 1 R SWheels 3$340 Parr 325 T RWheels 3-1/4$360 Pair 3 50 T RWheels 3-1/2$380 Pair NEW! NEW! NEW! LINE STARTER BOX FLIGHT THE DELUXE Completely Assembled Compact t Perfect Competitor Holds 12v Battery Power Panel Rack Starter ALSO New Drawer Storage Only $1495 information write call The1Bgx491~l Pike F1iht Lancaster PA 17604 Ph 717 291 2136 B uXDealer Inquiries Invited CL Speed/Hempel Con finued page 46 MACA newsletter enjoyed very much Combat fliers very interested rework ing engines just like Speed fliers Maybe can share some knowledge Combat fliers vice versa Received letter Les Baer Sr concerning Evert Gray Memorial Speed Bash held Allentown PA October 5 reports contest went very well temperature little cool high 640F sunny day low humidity hardly wind turnout excellent kept everyone busy whole time Nick Sher started day off breaking February 1981 119 SMOOTH R SLICKS 5TREAD T low bounce shock absorbing wheels feature new nylon metalic finish wheel hubs wheel pairs e matched mness quality balance DU-BRO PRODUCTS INC 480 BONNER RD WAUCONDA ILL 60084 New 1/4 SCALE 1918 NIEUPORT 38 C-i additional information WW 1 classic catalogue send $100 PROCTOR ENTERPRISES CORP PO eox 9641 San Diego CA 92109
Edition: Model Aviation - 1981/02
Page Numbers: 40, 41, 42, 118, 119
The author former Nationals CombatChampion hastaken home hardware three out five Natato date has won 80% local meets has entered Consistent equipment positive mental attitude keys success mention well-designed/trimmed airplane IN MY beginning days Combat Voodoo performance plane good stock form however sought higher level started experiment During first two years development ensuing modified Voodoos quite successful local regional national competition Now after seven cumulative years evolu tionary work Voodoos great-grandson no longer gives clues its family ancestry Super Voodoo completely different its forebearer way Super Voodoos design concept focuses competition practicality sacrificing thing Combat maneuvering ability easily said difficult achieve design parameter Super Voodoo satisfies de sired goal through careful research application proven aerodynamic theories plane scientifically designed thoroughly engineered Bill Netzeband premier geniuses Control Line aeronautics aided immensely pearls wisdom After reviewing published articles no easy task itselfl after eight-hours-a-day question answer sessions after explanations re-explanations data sheets cover just about everything Control Line aerodynamics Super Voodoo slowly started form drawing board Lets take peek Wing top view ultimate layout would leading trailing edges would taper towards other tip such way center-of-pressure would located quarter-chord point along span compared non-tapered rectangular wing tapered layout locates mean aerodynamic center wing half closer planes center line reduces stress concentrations bear directly planes center structure Sweeping trailing edge forward tip leaving leading edge straight progres sively moves center-of-pressure forward much CL Combat piloting ability much plane know would answer question top pilot flying top plane then. Super Voodoo carefully thought out proven contests_ 40 Model Aviation FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 3/B 3/4 MAPLE MOTOR OERATS~\ VR PLY MOTOR MAlAY DOLBIEB ENONIE SHOWN III I/1B HARD BALSA TRAILING EDGE VR PLY L E OGOPLER 0 PLYWOGO REUIIRANK MT 3/B 3/4 MAPLE MOTOR MOIATS 3/R BALSA TRBI OUT TO FIT LE OF WING NESIC AWE HJSIIROO~ CLOYR REINFORCEMENT7 K NED UROR BALSA LEADRAG ODOR STOOl IIFIi 1-ffi 1116 PLY OOEIORS HO BALSA BOOM VB BRASH TUBING S32 MEDIC WIRE / VB lABOR BALSA STAWLATOR K Ii WING RWD-I/IB MED MO BALSA B REGO CENTER BA- MED ME BALSA TRIM FOR LE DSAWBB TRW F MOLCRRME MANY JFALOR RIB VOMED HO BALSA BOOR- 2 PLY DOWLORS REdO SLAEY VOODOO DESIGNED S DRAWN BY 30W4 JO TRACING BY JOE CEMBRCO wing center line tip can produce sudden unwanted glitches Super Voodoos rectangular wing also keeps its center-of-pressure along quarter chord however layout builds up stress wings center structure due panels outwardly displaced mean aerodynamic center Fortunately extra stress easily compensated construction technique Strong Sig leading edge stock two-ounce density per 36-in length integral five-ply doubler keep wing intact Trailing edge stock should very hard balsa complement leading edge components keeping wing together Inci dentally plastic coverings contribute virtually nothing structural integrity Wing side view has lot conjec ture concerning airfoil design relatively low speed 90-110 mph aircraft have seen everything Combat design sharp leading edge rapier airfoil blunt leading edge blimp airfoil former would suited hypersonic moon shots latter would quite happy leisurely balloon February 1981 41 V4 SOFT BALSA AlNO TIPS ___________________ VW NED ME BALSA BS PLY RELLCRAIAO MYALA PEWI HP WEBABIS ALOM MACWEB CANlABOR AS NEERED IW BRASS SIRING WILLCRAME-F A FALSE RIB VBSOFT BALSA FIEDIBAE LEADOIJTS IMED MO BALSA RIB VA PLY POARIUG GAADE LY6 PLY DEDALERSPUGARGORYLON ALEROR AWARE LEAORE EDREAND 5 BEaCRANOVB BALSA YE Unelncfl center rib integral belicrank mount allows easy checking maintenance complete control system Frayed flex ible leads worn bellcrank holes either indicate need replacementl can seen readily through clear iron-on covering Author uses Fascal latest miracle adhesives such Hot Stuff epoxy Super Voodoo builds fast faster other plane Once parts cut out plane can built couple hours race Through unprejudicial testing has found airfoil selection speed type aircraft really critical Just remem ber airfoil neither too blunt nor sharp leading edge has 12-18% maximum thickness high point located between 2030% chord airfoil has enough potential job hand airfoil Super Voodoo magical modified St Cyr 172 has 135% maximum thickness 30% chord model 3874-in span 646-in chord St Cyr 172 airfoil tested wind tunnel 90mph velocity results showed lift coefficient approaching 10 20/1 lift/drag ratio airfoils center pressure stayed 25% chord throughout lift curve St Cyr 172 displayed non-violent stall characteristics Id like pass inter esting fact St Cyr airfoils designed tested 1925 As saying goes New news reintroduced old news Heres multiple choice Which two correct answers two important factors Combat design wing loading b power loading c span loading d trim e aspect ratio 0 prop nut g above After careful reviewing determined correct answers d Lets take former first Brass tubing spacers nylon aileron bush ing promotes long trouble-free hinge life Sys tem eliminates wear stabilator surface boom hinges side loads Wing loading Through experimentation maximum wing loading winning performance very close 15 sq per oz wing loading can obtained building kit Voodoo all-up weight including fuel exactly 22 oz stock Voodoo has 330 sq wing area contrast 17-oz Super Voodoo 3562 sq computes 203 sq per oz wing loading roughly 35% favorable first example regards wing loading just remember 15 sq peroz adequate 20 sq per oz gravy Trim whats Trim has nothing getting haircut unless plane trimmed incorrectly may bank towards center circle close shave haircut Proper trimming Voodoo Combat craft accomplished through use pins pin point accuracy Note Super Voodoos center gravity CG position plans Push strong straight pins such pins part way wing tips exactly opposite CG position shown plans CG isnt correct until model remains level supported finger tips under shafts pins Super Voodoo requires exact location maximum performance An eighth-inch ward placement CG Super Voodoos ideal spot turns aircraft smooth-turning bomber highly maneuver able fighter performance make sure planes CG exactly shown plans Unless like helplessly watch Free Flight move CG further rearward will have no Continued page 118 42 Model Aviation Pacifier compartment Location see plan does change pitch-axis CO An added bonus pacifier system doesnt dis place lateral CG outward much long surgical tubing bladder Important advantage open engine pod compared enclosed type lower crankcase cooling bettergiving steadier needle settings Super Voodoos engine pod covered glass cloth resin builds faster still offers exceptional strength once-proud craft would ever again look like airplane let alone fly should never underestimate ambi tion blind optimism vintage airplane fan 1972 remaines Mew Gull purchased Formula race-pilot/builder Tom Storey Martin Barraclough long expensive process making something out almost nothing begun hard draw distinct line between restoring wreck ends building entirely new airplane begins project must surely have straddled such line six years worked replacing rotten old wood strong new wood replacing cracked discolored plexiglass clear new panels installing new controls instruments other parts make new Mew Gull look like first raced last April 16 1978 Mew Gull took off Redhill Aerodrome home Tiger Club first time 13 years Percival Mew Gull English skies Two months later Mew Gull performed Old Warden showing off its famous lines thousands appreciative fans zoomed just few feet above grass runway roared through steeply banked pylon turns No longer did lovers old-time racing have use imaginations reading Mew Gulls exploits look listen past become present wasnt jut nostalgia Later season Thruxton Tom Storey climbed roomy cockpit buckled up waited starter swing little green flag race time again Forty-one years after Alex Henshaw first raced EXF Kings Cup Tom Storey did same didnt win could because handicapper good memory amazing speeds airplane clocked Kings Cup Races long ago Mew Gull raced again. will race yet again what Edgar Percival meant words late Doug Bianchi just goes show aeroplane comes good family properly brought up have good chance getting home piece Mew Gull G-AEXF once piece lovely piece sincere thanks priceless research Maurice Marsh Air Racing Specialist Air Britain International Society Aviation Historians Super Voodoo/Jo Continued page 42 control Trim line rake Proper line rake has computed via formula flight-adjusted minimum aircraft speed 90 mph build line rake 120-mph speeds will suffer decreased line tension soon plane lifts off streamer full streamer can slow down Fast Combat plane almost 10 mph build excessive line rake will waste engine efficiency directing power outwards Proper line rake computed 90-mph minimum Combat speed because observa tions five Nationals date varying contest locales observed under average atmospheric conditions top Combat fliers usually turning 90-100 mph Under ideal atmospheric conditions same fliers upped speeds 100-110 mph region Poor atmospheric conditions dropped speeds 80-90 mph range flights full streamer flights accurately timed data little interpolation can see selected 90 mph minimum Combat speed compute line rake Before go next area trim heres tip use find true air speed Combat plane flying absolutely level Step 1 Note angle between lines ground Step 2 Look up cosine angle multiply apparent speed plane get true speed Example clocked plane flying 45 degrees planes apparent speed 100 mph speed charts assume plane remains level during clocking case plane wasnt level its chart speed true speed apparent speed get true speed multiply cosine angle plane flying cosine 45 degrees 707 apparent speed 100 mph l00times 707 equals 707 mph true speed plane flying 25 degrees cosine 25 degrees 906 true air speed would 100 times 906 906 mph cosine values used examples two popular angles Combat pilots cruise planes waiting opponents become airborne cosine values 45- 25-degree angles can rounded off 7 9 respectively easy multiplica tion less 1% error true air speed Memorization two angles values could future use contest field Trim wing offset Because outboard wing travels faster inboard wing lift center Control Line aircraft same its geometric center proper amount wing offset trim needed Super Voodoo precisely calculated found 118 Mode Aviation Super Voodoos wing lift center laterally located 312-in outboard geometric center wing plans show wing lift centers lateral reference point engine thrust line Trim CG-offset-from-thrust-line plans show lateral CG displaced 250-in outboard engine thrust line CG offset-from-thrust-line distance precisely cal culated too Trim Stabilator Most Combat pilots would probably prefer exact amount stabilator movement produce minimum radius turns speed loss Super Voodoo figure 16 degrees direction Personally prefer 24 degrees up down movement stabilator 50% stabilator move ment needed CG per plan certain situations use extra stabilator movement advantage sacrificing little speed gain tighter turn Trim control system Use favorite method suit timing Personally prefer set up control system degree ofbellcrank movement produces degree stabilator movement extremely fast-reacting setup within wing however adjust planes internal control system externally reducing line spacing handle until plane flies perfectly eye-mind-hand rhythm What happens extensive trimming done done properly Super Voodoo will have its drag center line wing lift center thrust line hence plane will react positively command giving no surprises pilot allows full concentraion winning match Performance 50% nitro-methane 8-in pitch epoxy-fiber prop flying couple feet off deck speed pylon Super Voodoo has attained 126 mph Fox Combat Special 121 mph Fox 36XBB both engines retimed freed fitted special rear bearings Timing seven level laps exactly 60-ft lines Now comes big Combat tip 50% nitro 8-in pitch props flying level 60-ft lines have lost matches have won want win try combination 10-15% nitro-methane 9-6 Rev-Up 9-6 Top Flite prop ever fly level unless attacking use 60-ft 5-in lines added reach Using 1 2% nitro fuel 9-6 prop Super Voodoos Combat speed streamer 114 mph Fox Combat Special 109 mph Fox 36XBB enough performance consistently win Building outline Epoxy plywood doubler leading edge Pin down trailing edge flat building board Instant-glue Hot Stuff etc tip ribs trailing leading edges finish instant gluing other ribs place except center rib plywood bellcrank mount installed epoxy center rib trailing leading edges Go over instantglue joints epoxy epoxy upper trailing edge place Glue wing tips Build up motor mount single unit cut Out appropriately leading edge center rib clearance Epoxy motor mount unit wing Epoxy plywood doublers both sides x 9-in boom blank Cut out monoboom sandwich Cut Out stabilator very hard balsa Using Klett aileron hinge 3/32-in wire -in brass tubing cloth join stabilator boom epoxy boom unit wing After pushrod leadout guides epoxied install controls Install fuel system Cover wing using Fascal Fuel-proof exposed wood parts Drill holes engine streamer move engine fore aft achieve correct CG place ment Using wing-tip weight balance correct lateral CG Super Voodoo ready flight Final note Whether youre new Combat expert flier sincerely hope have learned something use article Have fun Combat circle SAFE FLYING IS NO ACCIDENT 175 T RWheels 1 -3/4$240 Pair 200 T RWheels 2$260 Pair 2 25 T R SWheels 2-1/4$280 Parr 250 T R SWheels 2-1/2$300 Pair 275 T R SWheels 2-3/4$320 Pair 3 00 1 R SWheels 3$340 Parr 325 T RWheels 3-1/4$360 Pair 3 50 T RWheels 3-1/2$380 Pair NEW! NEW! NEW! LINE STARTER BOX FLIGHT THE DELUXE Completely Assembled Compact t Perfect Competitor Holds 12v Battery Power Panel Rack Starter ALSO New Drawer Storage Only $1495 information write call The1Bgx491~l Pike F1iht Lancaster PA 17604 Ph 717 291 2136 B uXDealer Inquiries Invited CL Speed/Hempel Con finued page 46 MACA newsletter enjoyed very much Combat fliers very interested rework ing engines just like Speed fliers Maybe can share some knowledge Combat fliers vice versa Received letter Les Baer Sr concerning Evert Gray Memorial Speed Bash held Allentown PA October 5 reports contest went very well temperature little cool high 640F sunny day low humidity hardly wind turnout excellent kept everyone busy whole time Nick Sher started day off breaking February 1981 119 SMOOTH R SLICKS 5TREAD T low bounce shock absorbing wheels feature new nylon metalic finish wheel hubs wheel pairs e matched mness quality balance DU-BRO PRODUCTS INC 480 BONNER RD WAUCONDA ILL 60084 New 1/4 SCALE 1918 NIEUPORT 38 C-i additional information WW 1 classic catalogue send $100 PROCTOR ENTERPRISES CORP PO eox 9641 San Diego CA 92109
Edition: Model Aviation - 1981/02
Page Numbers: 40, 41, 42, 118, 119
The author former Nationals CombatChampion hastaken home hardware three out five Natato date has won 80% local meets has entered Consistent equipment positive mental attitude keys success mention well-designed/trimmed airplane IN MY beginning days Combat Voodoo performance plane good stock form however sought higher level started experiment During first two years development ensuing modified Voodoos quite successful local regional national competition Now after seven cumulative years evolu tionary work Voodoos great-grandson no longer gives clues its family ancestry Super Voodoo completely different its forebearer way Super Voodoos design concept focuses competition practicality sacrificing thing Combat maneuvering ability easily said difficult achieve design parameter Super Voodoo satisfies de sired goal through careful research application proven aerodynamic theories plane scientifically designed thoroughly engineered Bill Netzeband premier geniuses Control Line aeronautics aided immensely pearls wisdom After reviewing published articles no easy task itselfl after eight-hours-a-day question answer sessions after explanations re-explanations data sheets cover just about everything Control Line aerodynamics Super Voodoo slowly started form drawing board Lets take peek Wing top view ultimate layout would leading trailing edges would taper towards other tip such way center-of-pressure would located quarter-chord point along span compared non-tapered rectangular wing tapered layout locates mean aerodynamic center wing half closer planes center line reduces stress concentrations bear directly planes center structure Sweeping trailing edge forward tip leaving leading edge straight progres sively moves center-of-pressure forward much CL Combat piloting ability much plane know would answer question top pilot flying top plane then. Super Voodoo carefully thought out proven contests_ 40 Model Aviation FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 3/B 3/4 MAPLE MOTOR OERATS~\ VR PLY MOTOR MAlAY DOLBIEB ENONIE SHOWN III I/1B HARD BALSA TRAILING EDGE VR PLY L E OGOPLER 0 PLYWOGO REUIIRANK MT 3/B 3/4 MAPLE MOTOR MOIATS 3/R BALSA TRBI OUT TO FIT LE OF WING NESIC AWE HJSIIROO~ CLOYR REINFORCEMENT7 K NED UROR BALSA LEADRAG ODOR STOOl IIFIi 1-ffi 1116 PLY OOEIORS HO BALSA BOOM VB BRASH TUBING S32 MEDIC WIRE / VB lABOR BALSA STAWLATOR K Ii WING RWD-I/IB MED MO BALSA B REGO CENTER BA- MED ME BALSA TRIM FOR LE DSAWBB TRW F MOLCRRME MANY JFALOR RIB VOMED HO BALSA BOOR- 2 PLY DOWLORS REdO SLAEY VOODOO DESIGNED S DRAWN BY 30W4 JO TRACING BY JOE CEMBRCO wing center line tip can produce sudden unwanted glitches Super Voodoos rectangular wing also keeps its center-of-pressure along quarter chord however layout builds up stress wings center structure due panels outwardly displaced mean aerodynamic center Fortunately extra stress easily compensated construction technique Strong Sig leading edge stock two-ounce density per 36-in length integral five-ply doubler keep wing intact Trailing edge stock should very hard balsa complement leading edge components keeping wing together Inci dentally plastic coverings contribute virtually nothing structural integrity Wing side view has lot conjec ture concerning airfoil design relatively low speed 90-110 mph aircraft have seen everything Combat design sharp leading edge rapier airfoil blunt leading edge blimp airfoil former would suited hypersonic moon shots latter would quite happy leisurely balloon February 1981 41 V4 SOFT BALSA AlNO TIPS ___________________ VW NED ME BALSA BS PLY RELLCRAIAO MYALA PEWI HP WEBABIS ALOM MACWEB CANlABOR AS NEERED IW BRASS SIRING WILLCRAME-F A FALSE RIB VBSOFT BALSA FIEDIBAE LEADOIJTS IMED MO BALSA RIB VA PLY POARIUG GAADE LY6 PLY DEDALERSPUGARGORYLON ALEROR AWARE LEAORE EDREAND 5 BEaCRANOVB BALSA YE Unelncfl center rib integral belicrank mount allows easy checking maintenance complete control system Frayed flex ible leads worn bellcrank holes either indicate need replacementl can seen readily through clear iron-on covering Author uses Fascal latest miracle adhesives such Hot Stuff epoxy Super Voodoo builds fast faster other plane Once parts cut out plane can built couple hours race Through unprejudicial testing has found airfoil selection speed type aircraft really critical Just remem ber airfoil neither too blunt nor sharp leading edge has 12-18% maximum thickness high point located between 2030% chord airfoil has enough potential job hand airfoil Super Voodoo magical modified St Cyr 172 has 135% maximum thickness 30% chord model 3874-in span 646-in chord St Cyr 172 airfoil tested wind tunnel 90mph velocity results showed lift coefficient approaching 10 20/1 lift/drag ratio airfoils center pressure stayed 25% chord throughout lift curve St Cyr 172 displayed non-violent stall characteristics Id like pass inter esting fact St Cyr airfoils designed tested 1925 As saying goes New news reintroduced old news Heres multiple choice Which two correct answers two important factors Combat design wing loading b power loading c span loading d trim e aspect ratio 0 prop nut g above After careful reviewing determined correct answers d Lets take former first Brass tubing spacers nylon aileron bush ing promotes long trouble-free hinge life Sys tem eliminates wear stabilator surface boom hinges side loads Wing loading Through experimentation maximum wing loading winning performance very close 15 sq per oz wing loading can obtained building kit Voodoo all-up weight including fuel exactly 22 oz stock Voodoo has 330 sq wing area contrast 17-oz Super Voodoo 3562 sq computes 203 sq per oz wing loading roughly 35% favorable first example regards wing loading just remember 15 sq peroz adequate 20 sq per oz gravy Trim whats Trim has nothing getting haircut unless plane trimmed incorrectly may bank towards center circle close shave haircut Proper trimming Voodoo Combat craft accomplished through use pins pin point accuracy Note Super Voodoos center gravity CG position plans Push strong straight pins such pins part way wing tips exactly opposite CG position shown plans CG isnt correct until model remains level supported finger tips under shafts pins Super Voodoo requires exact location maximum performance An eighth-inch ward placement CG Super Voodoos ideal spot turns aircraft smooth-turning bomber highly maneuver able fighter performance make sure planes CG exactly shown plans Unless like helplessly watch Free Flight move CG further rearward will have no Continued page 118 42 Model Aviation Pacifier compartment Location see plan does change pitch-axis CO An added bonus pacifier system doesnt dis place lateral CG outward much long surgical tubing bladder Important advantage open engine pod compared enclosed type lower crankcase cooling bettergiving steadier needle settings Super Voodoos engine pod covered glass cloth resin builds faster still offers exceptional strength once-proud craft would ever again look like airplane let alone fly should never underestimate ambi tion blind optimism vintage airplane fan 1972 remaines Mew Gull purchased Formula race-pilot/builder Tom Storey Martin Barraclough long expensive process making something out almost nothing begun hard draw distinct line between restoring wreck ends building entirely new airplane begins project must surely have straddled such line six years worked replacing rotten old wood strong new wood replacing cracked discolored plexiglass clear new panels installing new controls instruments other parts make new Mew Gull look like first raced last April 16 1978 Mew Gull took off Redhill Aerodrome home Tiger Club first time 13 years Percival Mew Gull English skies Two months later Mew Gull performed Old Warden showing off its famous lines thousands appreciative fans zoomed just few feet above grass runway roared through steeply banked pylon turns No longer did lovers old-time racing have use imaginations reading Mew Gulls exploits look listen past become present wasnt jut nostalgia Later season Thruxton Tom Storey climbed roomy cockpit buckled up waited starter swing little green flag race time again Forty-one years after Alex Henshaw first raced EXF Kings Cup Tom Storey did same didnt win could because handicapper good memory amazing speeds airplane clocked Kings Cup Races long ago Mew Gull raced again. will race yet again what Edgar Percival meant words late Doug Bianchi just goes show aeroplane comes good family properly brought up have good chance getting home piece Mew Gull G-AEXF once piece lovely piece sincere thanks priceless research Maurice Marsh Air Racing Specialist Air Britain International Society Aviation Historians Super Voodoo/Jo Continued page 42 control Trim line rake Proper line rake has computed via formula flight-adjusted minimum aircraft speed 90 mph build line rake 120-mph speeds will suffer decreased line tension soon plane lifts off streamer full streamer can slow down Fast Combat plane almost 10 mph build excessive line rake will waste engine efficiency directing power outwards Proper line rake computed 90-mph minimum Combat speed because observa tions five Nationals date varying contest locales observed under average atmospheric conditions top Combat fliers usually turning 90-100 mph Under ideal atmospheric conditions same fliers upped speeds 100-110 mph region Poor atmospheric conditions dropped speeds 80-90 mph range flights full streamer flights accurately timed data little interpolation can see selected 90 mph minimum Combat speed compute line rake Before go next area trim heres tip use find true air speed Combat plane flying absolutely level Step 1 Note angle between lines ground Step 2 Look up cosine angle multiply apparent speed plane get true speed Example clocked plane flying 45 degrees planes apparent speed 100 mph speed charts assume plane remains level during clocking case plane wasnt level its chart speed true speed apparent speed get true speed multiply cosine angle plane flying cosine 45 degrees 707 apparent speed 100 mph l00times 707 equals 707 mph true speed plane flying 25 degrees cosine 25 degrees 906 true air speed would 100 times 906 906 mph cosine values used examples two popular angles Combat pilots cruise planes waiting opponents become airborne cosine values 45- 25-degree angles can rounded off 7 9 respectively easy multiplica tion less 1% error true air speed Memorization two angles values could future use contest field Trim wing offset Because outboard wing travels faster inboard wing lift center Control Line aircraft same its geometric center proper amount wing offset trim needed Super Voodoo precisely calculated found 118 Mode Aviation Super Voodoos wing lift center laterally located 312-in outboard geometric center wing plans show wing lift centers lateral reference point engine thrust line Trim CG-offset-from-thrust-line plans show lateral CG displaced 250-in outboard engine thrust line CG offset-from-thrust-line distance precisely cal culated too Trim Stabilator Most Combat pilots would probably prefer exact amount stabilator movement produce minimum radius turns speed loss Super Voodoo figure 16 degrees direction Personally prefer 24 degrees up down movement stabilator 50% stabilator move ment needed CG per plan certain situations use extra stabilator movement advantage sacrificing little speed gain tighter turn Trim control system Use favorite method suit timing Personally prefer set up control system degree ofbellcrank movement produces degree stabilator movement extremely fast-reacting setup within wing however adjust planes internal control system externally reducing line spacing handle until plane flies perfectly eye-mind-hand rhythm What happens extensive trimming done done properly Super Voodoo will have its drag center line wing lift center thrust line hence plane will react positively command giving no surprises pilot allows full concentraion winning match Performance 50% nitro-methane 8-in pitch epoxy-fiber prop flying couple feet off deck speed pylon Super Voodoo has attained 126 mph Fox Combat Special 121 mph Fox 36XBB both engines retimed freed fitted special rear bearings Timing seven level laps exactly 60-ft lines Now comes big Combat tip 50% nitro 8-in pitch props flying level 60-ft lines have lost matches have won want win try combination 10-15% nitro-methane 9-6 Rev-Up 9-6 Top Flite prop ever fly level unless attacking use 60-ft 5-in lines added reach Using 1 2% nitro fuel 9-6 prop Super Voodoos Combat speed streamer 114 mph Fox Combat Special 109 mph Fox 36XBB enough performance consistently win Building outline Epoxy plywood doubler leading edge Pin down trailing edge flat building board Instant-glue Hot Stuff etc tip ribs trailing leading edges finish instant gluing other ribs place except center rib plywood bellcrank mount installed epoxy center rib trailing leading edges Go over instantglue joints epoxy epoxy upper trailing edge place Glue wing tips Build up motor mount single unit cut Out appropriately leading edge center rib clearance Epoxy motor mount unit wing Epoxy plywood doublers both sides x 9-in boom blank Cut out monoboom sandwich Cut Out stabilator very hard balsa Using Klett aileron hinge 3/32-in wire -in brass tubing cloth join stabilator boom epoxy boom unit wing After pushrod leadout guides epoxied install controls Install fuel system Cover wing using Fascal Fuel-proof exposed wood parts Drill holes engine streamer move engine fore aft achieve correct CG place ment Using wing-tip weight balance correct lateral CG Super Voodoo ready flight Final note Whether youre new Combat expert flier sincerely hope have learned something use article Have fun Combat circle SAFE FLYING IS NO ACCIDENT 175 T RWheels 1 -3/4$240 Pair 200 T RWheels 2$260 Pair 2 25 T R SWheels 2-1/4$280 Parr 250 T R SWheels 2-1/2$300 Pair 275 T R SWheels 2-3/4$320 Pair 3 00 1 R SWheels 3$340 Parr 325 T RWheels 3-1/4$360 Pair 3 50 T RWheels 3-1/2$380 Pair NEW! NEW! NEW! LINE STARTER BOX FLIGHT THE DELUXE Completely Assembled Compact t Perfect Competitor Holds 12v Battery Power Panel Rack Starter ALSO New Drawer Storage Only $1495 information write call The1Bgx491~l Pike F1iht Lancaster PA 17604 Ph 717 291 2136 B uXDealer Inquiries Invited CL Speed/Hempel Con finued page 46 MACA newsletter enjoyed very much Combat fliers very interested rework ing engines just like Speed fliers Maybe can share some knowledge Combat fliers vice versa Received letter Les Baer Sr concerning Evert Gray Memorial Speed Bash held Allentown PA October 5 reports contest went very well temperature little cool high 640F sunny day low humidity hardly wind turnout excellent kept everyone busy whole time Nick Sher started day off breaking February 1981 119 SMOOTH R SLICKS 5TREAD T low bounce shock absorbing wheels feature new nylon metalic finish wheel hubs wheel pairs e matched mness quality balance DU-BRO PRODUCTS INC 480 BONNER RD WAUCONDA ILL 60084 New 1/4 SCALE 1918 NIEUPORT 38 C-i additional information WW 1 classic catalogue send $100 PROCTOR ENTERPRISES CORP PO eox 9641 San Diego CA 92109