MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 81, 82, 83, 84, 165, 166
MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 81, 82, 83, 84, 165, 166
MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 81, 82, 83, 84, 165, 166
MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 81, 82, 83, 84, 165, 166
MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 81, 82, 83, 84, 165, 166
MY LOVE AFFAIR P-61 Black Widow goes back good years fact probably began dad took Air Force Museum Dayton OH very first time Widow sitting outside lot after noon sun its black paint faded chipped weatherworn Right away smit ten dad said looks just like ones saw over 40 years ago Pacific little worn side what really fascinated outlines brute size sheer firepower airplane Insofar can recall first trip Air Force Museum took place about 21 years ago Since time museum has rebuilt today largest niili tary aviation museum world over 200 restored aircraft display Generally visit Air Force Museum two three times year Sometimes like go during week browse through aircraft files second-floor Re search Department open public weekdays oaly 900 am 400 pm must have reservation enter Ive called little two hours long two days advance further information making reserva tion Research Department call 513 255-3284 department well stocked cabinets laden photos blueprints drawings favorite aircraft Its pure gold hard-to-find informa tion youve looked long Black Widow achieved stunning rec ord both Pacific European thea ters during Second World War air craft weighed over 27400 lb its 66-ft wingspan comparable dium-sized bomber Widows two 2200-hp engines powered top speed August 1988 81 Top The Black Widow sits ready waiting plane pictured over two years old still looks flies great Above P-el looks before lines scribed its hard nerves scratch lines finish thats part Scale modeling 3/B BALSA MAKE 2 PYLON -19 VORTAC TANK RELEASEPYLON _____ QBCEJANLNNER PYLON MOTOR OFFSET WITH MASS WASHER FIBERGLASS COWLING TO P 3 SBALSA SHEET W NC S SHEETED WTH B BALSA TOP B BOTTOM NOT SHOWN FOR CLARTY / RED- ___ ___ ______ _____ _____ _____ ____ W-5W-4W-3-2-I W-IEWJ W-9W-B 1WW-IA 1/18 IPLY ___________ 1/32 MW 7--------. LEAO-OUTS ILDE NOTE CUT CENTER RIB WIA ON DASH LINE FOR BELLCRANK-WINGD iS LI6PLY CLEARANCEPLAN / -7 W-I ALSA MAKE S W-IA UR BALSA MAKE W-IB 3/B BALSA MAKE 2BH K W-2EDCEDE--_W7 W3EDw W-4ED-*9 W-5EDc7 W-6ED MAKE 2 OF EACH FROM RIBS W-2 THRU W-9 1/8 BALSA SHEETBALSA BLOCK 1/B MW NOSE GEAR MAKE r2 MW MAIN GEAR j MAKE 2 LANDING GEAR I/B PLY 1/i BELLCRANK MOUNT 1116 PLY SPAR DOUBLERS 1/2 BALSA SHEET LEFT BOOM CROSS SECTION [ B B SPAR DOUBLERS 11/16PLY 5-c 20 ENGINE FLEX CABLE VIEW V16 PLY / DOUBLERS FIBERGLASS COWLING / AIR SCOOPI 411 I/16LY V 10SPRING L FRONT SPAR CORE jI/B BALSA REAR SPAR -\ SECT A-A J NOTE BOOMS CONTOUR OUTSIDE ONLY AK -A 3/32MW PUSH ROD 3/S BALSA SHE 1/2 BALSA SHEET RIGHT BOOM STABILIZER-r- -__- -- __ 1-iTL __ II I_ 4-1/ ELEVATORA EL V3/B BALSA HORNSHEET over 370 mph its radar capa ble locating tracking down enemy air craft up 30 miles away complete dark ness Combining speed maneuver ability fighter plane capacity carry four 50-caliber machine guns four 20mm cannons gave warbird ex tremely deadly prowess prototype model noted P-6 1-B nicknamed Times Wastin piloted Major Carroll C Smith 418th Night Fighter Squadron stationed Pacific single night December 29 1944 Major Smith radar operator Lt Phillip Porter de stroyed four Japanese aircraft off coast Mindoro Philippines coup earned Major Smith distinction highest-scoring US Night Fighter Ace total seven kills Construction designed P-6 1-B model exactly scale including wing ribs plane body outline orig inally intended test aircraft thenprojected full-body Black Widow now under construction Building fly ing Scale model enjoyable two caveats Keep tail section light possible make sure model properly balanced before flying dont lose sight key points fly ing should present no problems Wing Completing wing beforehand makes easier final assembly job Af ter cutting out necessary parts laminate together two main spars / ply wood both sides Trial fit midsec tionWl WlA WiBonto main spars gluing looks good fin ish wing assembly glue Check ribs square off main spar align leading trailing edges Tack glue used Hot Stuff Super-T ribs position regluing later used Pica Gluit white glue Trial fit bellcrank Sturdi Built onto mount glue place After sheeting bottom half wing position attach tank releases throttle cables two tank re leases made Vortac Company really want put show four re leases can easily installed Make sure everything works smoothly before sheeting top wing half best results sheeting wing use Hot Stuff Super-T glue together 6-inwide 4-in-wide balsa sheets sheet entire wing panels large piece results less sanding seams hence smoother contoured wing surface new Grate Shapes contour sanding 82 Model Aviation DROP TANK DETAIL SECTION THRU PYLON / AIR PS 1/16 PLY DOUBLER lAB PLY K TANK RELEASE MNT Full-Size Plans Available. See Page 172 SINK MOTOR /B-RIGIT SIDE ENYA 19 ENGINE WITH 8 OP AIR SCOOP1/450 BALSA~MUSIC WIRE LEADING EDGE *9 SCREWSOLDER B DIA MUSIC WIRE PANEL LINESI/B TUBING1/16 BRASS 2 014 NOSE WHEEL /2 50 MAPLE 1-1/2 DIA BLEND WITH3/32 PLY PLYGOLDBERG -MAGIC FILLERMAKE 4 3/B I/23SPINNER MAPLE MOTOR MOUNTS-MAKE4 I. K BALSA SHEET AILERON I/B BALSA CHAMFR LINESHEETCOWLFIBERGLASS OF 1/6 SHEETING ----MAKE 2MOTOR MOUNT DETAIL L FSPECIFICATIONS TZ"~I/B BALSA SHEETSCALE36" __FULL LENGTHWING SPAN49-1/2 WEIGHT4-1/2 LBS -rnENOSE WHEEL MOUNT LENGTH37-1/4 BALSA1LI6BRABS------~ENGINESTWO 19-251/16 BALSA OUTER WING SPAR1/BBLEND WITHWING AREA429 50 INDOUBLERS SHEETFILLER MAKE 2 WHTE REDI/S BALSAFUSELAGETOP VIEW SHEET1/16 PLY DOUBLERSLEFT SIDE T ONLY SIDE VIEW -LJLJLLJ - RED LLOWMODEL AVIATION ROBART P-SI 40 MEDNORT 3HROP P61 B BLACK WIDOW3OIA ROBARTNOSE WHEEL DESIGNED B DRAWN BY LYN GREENOI23456 ______TRACING BY JOE DEMARCO blocks did fantastic job shaping lead-makes easy mount wing two ing edge tail surfaces set thesepieces blocks should considered indispensable Cut openings wing equipment modelers workshop dont know Scale builder could Defer permanent installation airscoops outer tank pylons until fuse lage has constructed glued wing along booms After shaping final sanding wing tips drill holes navigation lights Mine colored HO-size train lights Fuselage Basic materials -in mediumgrade balsa laminated A6 plywood balsa ensure joint midwing first cut fuselage out 4-in-wide 2in-wide sheets balsa Alternatively can use 6-in-wide balsa slip over wing However because requires 36-in length balsa latter method involves considerable waste twice costly Having joint middle wing August 1988 83 internal workings inwings proviae Bor vator twin bomb drop mechanisms has proven very reliable setup r Above Most notable shot detail engine cowl cowls add great bit fullness otherwise flat model Below authors model powered two Enya 19s all-up weight 4 lb advisable no smaller engines installed landing gear blocks same bal ance weight nose Epoxy landing gear blocks place dry drill A-in-dia hole blocks approxi mately angle shown plans Make sure nose gear wire fits snugly hole its wobble-free during land ings Locate center wing pencil using wing center mid point mark /2-in line extending 14 side Epoxy top bottom fuse lage halves wing Remember square fuselage off leading edge top wing before epoxy sets up Following pattern plan side view fuselage cut out two fuse lage sides /16 plywood Epoxy addi tional 1/16 plywood side rein forces wing saddle landing gear blocks providing reserve strength hope wont need dreaded hard landings Add rud ders elevators wheels engines correct balance weight nose sheet nose both sides A6 balsa Finish contouring shaping edges nose Booms tail surfaces Both left right booms made /2-in balsa 3/ x /2-in maple engine mounts sand wiched between %2 plywood epoxied uniform scale appearance inside both booms should equidistant fuselage Knowing condition would throw off centers engines compensated using Dremel tool rout countersink % engine mounts right side right boom Although wont exact dimension ally will greatly improve appearance engine offset Only brass washer needed properly offset engine used medium-lightweight grade balsa twin booms lightest grade available rudders stabi lizer 2-in formed aileron strip used elevator stage decided contour outer surfaces purchased A8-scale plastic P-61 kit manufactured Mono gram aid contouring kit can also help later detailing model imaginable degree desire Cowls wanted profile Scale model ugly protuberances engines tanks achieve tried differ ent approach Using profile cowling plan cut R-in-thick plywood disc same diameter back cowling Glue polyurethane foam blocks yellow case disc mount onto wood lathe shape profile just Perma-grit file Apply two coats K&B resin allow dry between coats sand After second coat dry should left smooth no sanding Screw I-bolt center hole plywood disc help removing plug Continued page 165 84 Model Aviation author says no uauui~ or P-61 just prior flight lend him hand act pit crew took 1st place Indiana State Meet left right Lisa Tina Jessica 1-1 eavy auiy laDriC wegn nags ror Building Covering Transporting & Field Tie-Down Easily filled sand shot up 5 pounds Five 4x6 bags per package Conforms curvatures PC95* Complete instructions CL Combat/Johnson Continued page 73 DE69 pt 8 Al Jorgensen Fargo ND68 pt 9 Paul Curtis Jacksonville FL66 pt 10 Bob Oge St Charles IL65 pt 11 Terry Bynum Phoenix AZ64 pt 12 Tom Fluker Houston TX63 pt 13 Greg Wojetecki Chi cago IL59 pt 14 Ed Brzys Detroit MI 58 pt 15 Paul Smith Sterling Heights MI 56 pt 16 Terry Sobolak Caiy NC52 pt 17 Wallace Krueger Maywood IL43 pt 18 Abbie Olson Fargo ND42 pt 19 Mark Smith Ft Worth TX41 pt 20 Phil Cartier Hummelstown PA37 Pt Taking individual honors various events Tom Fluker FM Combat Jerry Sabin Slow Combat Terry Bynum /2A Combat Michael Willcox Fast Combat Congratula tions guys Thats lot matches win co lumn District X MACA VP Barry Baxter has pro posed new event would take place Slow Combat basic restriction would 80-mph speed restriction 7909 mph65 sec two laps Just about anything can fly 60-ft lines would qualify although lightweight model would have definite advantage over heavy model Barrys proposed rules cover loopholes timing Im sure well think As horrifying event sounds some have big investment Slow Combat models wouldnt obsolete could de tune easily fly under 80-mph limit actually fly much faster would al low use strong efficient Fast-type model detuned engine rid skies long nose tail moment arms hated Slow Combat first came being could go back balsa spars light weight engine mounts suction venturis low nitro fuels Bladder-fed engines generally lot fuel-efficient fed tank plus theres weight savingsnot mention Worlds Most Useful Sanding Blocks 3/5&5/tCt 105 Ct 106 1/4 & 3/5 s/3/4 R95Vs v/5/t3/8 & Conibo package #2 1/4 & 3/8 CS 102 CS 103 Add $200 frarShippnsg 1/2 & 5/8 3/4 &1RoundsG5 200 PKG Combopackage #1 I3~tgss 4200 G5 $200 ShippingsquaresCS 300 PKG Six Pack Combo6~$ 200 101 -1 06hipping Add $300 ShippingSingle GS$5955 long lasting Shipping silicon carbide grit~All blocks sides10 Long expense tank chance using sante model engine change Fast Slow whole lot better trying use current Slow against top-lane Fasts Barrys club has putting series con tests featuring new concept Combat flying theyve sport models real Slows FAts diesels glows leftover Fox/Voodoo Fox/Goldberg combinations real measure success event fun Barry Baxter can reached 6490 Sonora Way Cypress CA 90630 also big Nostal gia Combat buff has plans available classic models such Orbit Ace WOW others Second Annual Money Nats turned out quite success last years almost win ner good sportsmanship recipient getting thousand-buck first place Michael Willeox par layed nine-win two-loss record big payoff plus share Calcutta Final benefited backers various fliers winning flier also MACA FAI team fund Michael already record eight-andone time other three quarterfinalists loss Richard Stubblefield ended up fourth Steve Kott third Larry Driskill runner-up Willeox Larry received Carver Corp stereo second place Glen Dye presented Steve Kott late-edition TWA 36s As FM team trials seemed near-parity amongst top half entrants Engine/model combinations seem closer ever some lesser-known fliers having equipment least good top guns Chuck Rudner Howard Rush Phil Gran derson best PA system ard gave demonstration quickest kill method disposing first-round opponent tn about second although next six rounds spectacular too didnt win flier has chance dominate fly ing over next couple years has Mi chael Willeox Michael father Pat have put lot effort analyzing what really go ing during matches Theyve made extensive use videos shoot meets have record what went during match have able leam mistakes Engine Covers Dust dirt among en gines worst enemies can greatly reduce life prized pomerplants So complete modeling acces sories ordering set MODEL lOx" yll protect engines sane money Order Yours Today Easily secured model seconds Fuelproof stretch fabric conforms engine/ muffler shapes Long life Velcro fasteners Attractive assorted colors Catalog NoSize 11011/2A thro 25 engines 110240 thru 60 engines 110360 thru 120 engines 1104 ras & Up Add $100 shinning Pricey $200 $250 $300 $350 tnumphs asked Michael hed planned some neat moves hed put people reply exactly what youd expect crafty fox What moves Picture Michael flying along about 20 ft opponent above behind him ready pounce kill little fake toward opponents model instinctively pulls up little avoid midair Wrong move Michael does quick U-turn inside guy gets kill pilot just right place circleand guys plane just wanted ABC piston/liners masses Tired hear ing about exotic items sold out before could get son wellknown design whizz engine-builder extraor dinaire may cranking up produce enough set ups everyone Tentative orders being taken Money Nats Price will about $60 piston/liner about $20 Ven turi connecting rod Black Widow/Green Continued page 84 later Mix up some plaster put bottom rubber bowl bucket deeper plug its pushed plug shouldnt touch bottom container back plug should flush top container Fill rest container plaster trying get air bubbles alongside plug 15 30 minutes plaster will start grow hot will harden hardening has begun wiggle plug slightly hold ing I-bolt carefully lift plug plaster Let mold dry overnight before lightly sanding interior Cut 3/s-oz fiberglass 1-in-wide strips start layering coats resin glass cloth mold Five six com plete layers should give cowling least A6 thick Let cure overnight break hammer away plaster cowling cowl removed should plenty extra material left August 1988 165 Add $100 shipping evaluate competition conditions Ensure change does want nothing want intent plain rule wording no way Contest Director can know what wanted 48/ TS FUN-TO-FLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE SPECIFICATIONS WINGSPAN50 IN WING AREA500 50 IN LENGHT34 IN WEIGHT31/2 4 LBS ENGINE25 40 KIT FEATURES BUILT UP WING &FUSEL SELECT BALSA SPRUCE & LIGHT PLYWOOD ALL PARTS MACHINED & FITTED PHOTOILLUSTRATEDCONSTRUCTIONBOOK oCOMPLETE HARDWARE PACKAGE 5995 TERMS KITS IN STOCK FORCHECK MONEY JER IMMEDIATE DELIVERYOR COD CASH ADD$400 FOR SHIPPING DEALER INQUIRIESjj~ ... ADD$300 FORCOD INVITEDARIZONA RESIDENTS ADD 1109 SOUTH PLAZA WAY #335FLAGSTAFF AZ 860016% FOR SALES TAX true square up After light sanding cut opening cowl seal up well last finish coat resin inside out Finishing painting Give model final sanding 400-grit sandpaper before filling dents blending everything Model Magic Filler Apply coat K&B Finishing Resin followed sand ing 400-grit paper dry Add second light coat resin go over model again 400-grit sandpaper applied two coats gray NAPA auto lacquer primer dry lightly sanded 600-grit sandpaper Two coats glossy black Perfect Paint Cheveron sprayed rest trim paint decals added coat clear satin sprayed used Chev eron Perfect Paint exclusively its easi est forgiving paint likely encounter Flying first order business check model balances centerof-gravity shown plan better yet make airplane little nose-heavy Before connecting lines certain plane will roll straight forward outside circle adjustable nose gear comes handy operation good friend Indianapolis Steve Ashby gave helpful hand starting engines first flight started outboard engine leaned out started leaned out inboard en gine match outboard Boy let tell crowed inboard matched outboard pure magic ears What beauti ful hypnotic sound just stood like plant soaking up until Steve ask going merely stand planning fly know answer lieve fly did day P-61 has ter rific flier never letdown Its very sta ble smooth wind touch-andgo maneuvers great wing tank drops 19 engines provide model adequate power thing go something biggerdont go less Whether flown competition purely fun Black Widow has consistently winner modeler cant ask Dihedral/Beron-Rawdon Continued page 95 moment fractions panel simply multiplied panel dihedral gle summed find EDA Further examples provided Figure 1 have EDA 100 Analogy ailerons amount dihe dral wing panel has determines its roll power plane yawed Thus plane flat center panel center panel makes no contribution roll power tip panels everything ap proximately equivalent aileron wing partial-span barn door ailerons V-dihedral wing makes equal contribu tion delta alpha-wise along length wing analogous strip aile rons taper proportion wing chord other analogies illus trated Figure 6 Note analogies may turned around used better understand function ailerons instance can see Figure 4 05 semi-span barn door ailerons will about 65% power ful full-span strip ailerons same percentage chord Transitional maneuvers steadystate maneuvers such rolling circling managed very well rudder eleva tor airplanes transitional maneuvers such initiating ending roll maneuver weak point because double series events required initiate end maneuver example series events re quired transition rapidly straight flight steady-state turn fairly com plex large rudder deflection accelerates plane yaw axis As plane comes yawed begins accelerate roll axis As plane approaches maxi mum yaw angle rudder deflection se lected plane decelerates yaw until maximum yaw angle reached air plane underdamped yaw due heavy wing tips undersized rudder may overshoot steady-state maximum yaw angle oscillate briefly about maximum angle Shortly after plane reaches maximum yaw angle maximum roll rate achieved Rudder deflection held until desired bank angle ap proached rudder neutralized airplane yaws back zero yaw airplane stops rolling again delays acceleration deceleration As can see order plane roll first must yaw order stop rolling must stop yawing order min imize lag between control input re sponse yaw roll acceleration decel eration should maximized achieved large fin/rudder long tall moment arm generous dihedral light weight airplane extremities namely wing tips tail group extremities overweight vertical stabilizer undersized too short moment arm plane will difficult fly precisely Its response will slow start will tend coast past desired re sponse prompting control input op posite direction input may also overshot airplane will end up wal lowing around will force pilot very slow smooth control puts giving up potential rapid pre cise control dihedral angle insufficient larger yaw excursions will necessary gener ate desired roll response will make planes response sluggish will reduce maximum roll rate Conversely plane has ample dihe dral lightweight extremities long tail mo ment generous vertical stabilizer its handling can immediate precise powerful General comments some inter esting properties point out about beha vior dihedral given airplane roll moment generated function yaw angle airspeed noteworthy overall angle attack impor tant unless airplane nearly stalled speed yaw angle same 166 Model Aviation