NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 156
NO OCR TEXT NO OCR TEXT angle shown plan adhere slow-setting cyanoacrylate CyA glues glue has set pin fuselage sides together cut wing saddle both halves once Cut stabilizer slot tail Add %2-sq longerons x A-in balsa uprights aft fuselage area both sides Note doublers under stab slot upright aft cabin bulkhead location Add %2 plywood trip lers up front wing mounts assembly dry repin two sides together sand matching outlines edge workbench works fine guide sanding block ensur ing edges remain square sand ing wing held place rubberbands rather nylon bolts drill A-in holes dowels loca tions shown Add / x -in servo mounting rails well rails fuel tank compart ment Glue undrilled hardwood wing mounting blocks place A2 ply triplers Cut two cabin formers -in ply wood firewall -in plywood Mark location throttle cable nose gear steering cable forward bulkhead drill bulkhead fit Nyrod Drill firewall engine mount bolts throttle cable fuel overflow lines Epoxy T-nuts back side mounting bolts Glue two cabin bulkheads fuselage sides using right triangle ensure theyre exactly perpendicular glue has set align two fuse lage sides Once youre satisfied thing square glue bulkheads second side Pull tail halves together glue Add firewall fuel tank floor recommend cutting pushrod exit slots tail installing Nyrod throttle before beginning top bot tom cross sheeting Its necessary ever sheet area below fuel tank before Nyrod nose gear can stalled Complete top bottom cross sheeting after tank has mounted fuel lines connected Using sand ing block 150-grit sandpaper round off square edges prepare fuselage covering Wing Choose two methods mak ing ribs may traced tem plate onto sheet balsa cut out individu ally may stack sawn 1 in sections /16 balsa band saw template method uses less wood Select four center ribs Trim /16 top bottom trailing edges ac commodate center sheeting en large spar notches ply dihedral braces sheet A6 x 3-in-wide balsa will make four trailing edges remainder used spar webs Cut out four /16 plywood rib doublers two left two right glue ribs trim bottom ribs con form doublers Saw out dihedral braces A-in plywood installation later Build wing over plan con ventional manner pinning bot tom main spars over plan elevate cross-strips /16 sheet balsa bottom surfaces ribs flush building board leaves room A6 leading edge sheeting will installed later Pin bottom trailing edge sheet place glue ribs main spar trailing edge assembled Note ribs ply doublers installed doublers facing oppo site sides add center ribs panel top trailing edge sheeting stage ribs place add R-in-sq balsa trailing odge top main spar Y6-sq leading edge Build other wing panel mirror im age first Cut two center ribs spar notch trial fit leading trailing edges main spar panel trimming necessary fit together propLeft Standard hardware used mount simple torsion-type main gear mis type ot gear can iae igi oi eguse still come back Right pushrods exit through slits fuselage sides near tail sheet stabilizer rudder quick easy make 26 Model Aviation Ieyxwo rinisneg anu reuy iu WOti model easy build shOu ~sent no problems intermediate level moaeier nose gear steering arm piece %-in dowel disc 1/ plywood two wood screws simple positive system C LY RRNDOLPH 1 PLV TIP PLATE \\\4 BL8A kflN6 TIP CAP \\ ZO25 ENG4E * * CRWO CD C CD 2 CD - 0 2 tIR WMEEL SHEET BRL SHEET N ULKHEADN. 7 7 \\\S 77 T Thy - r1CMFL NIcE BfiLOA DOUBLER 3/ BALSA CHET7/ 7 PLY DIHEDPL BRACE Y4 PLI -----4 BAL&A PAR - 7BALSA TE Y4 PUI 7 -1 -77- 77 7 /8 DIA MUOIc WIREN U A &iEEEN x BALSA 8tIET N 6ALSA 8IEiT RB1 N RCE iV 5I3ILT ALl RAI4VI AP4DOLPll8 DESIGN6 tJD HOUSE JV8T 10 HoLD THEM LI4kfDER IF LcOuLD BILL WMFcRrHEsNSTRUCTIop4 1/16 PLYWOOD WING TIP P ATE I/B BALSA SKEET WING TIP CAP~ WING TIP PLATE NOTE LOCATION DIHEDERAL- I/2 UNDER EACH TIP ur -- ---- /16 B TOP AS PLYWOOS F1JtL LINE TUBES 1V8BRASS TUBE THROTTLE ENGINE NOUNT /4 PLYWOOD ENGINE MOJNT KFl 1/16 BALSA SKEET FUEL TANK FLOOR /32 PLY Ml DF 1W NOSE GEARI/B PLY DISK STEERING ARM OOWEL TOTHROTTLE FIT SPRINGWOODCABLE SCREWS TAPER TO FIT CLEVISF-D 20 - 25 ENGINE F-I C FUEL TANK _____N NOSE SEAR STEERING I/B DIA MUSICATTACH TO RUDDER WIRE NOSE GEARSERVO /4 DO NYLONBAL D-I/4DIAWING BOLTS NOSE WHEEL PLY DOUBLERS erly Bevel main spars leading trailing edges dihedral angle join two halves dihedral braces cut out previously Separate trailing edge sections center ribs form servo well join leading edge pieces center Add top trailing edge sheeting Fit wing fuselage mark spars intersect center hold-down blocks Remove wing fuselage drill A-in holes through spars marked locations A-in drill should just fit between ply dihedral braces touching adding top leading edge sheet remember drill bottom up through top sheeting before adding bottom sheet top through bottom Once sheeting complete build up add -in ply gear mounts sand completed wing ailerons tip plates will added airplane 28 Model Aviation Close-up 0 tuselage siae snowing y2-in D8158 aiagonai grain aouoier ana y32-In plywood triplers glued together fuselage side laminations completed pin two right left fuselage sides together carefully sand same contour right triangle used ensure vertical alignment cabin formers theyre installed Note holes throttle nose gear lines have drilled front former tuel tank held position wimn xignm-mming DIOCKS OS Roam sides au sure mere ere no kinks fuel overflow lines before gluing top sheeting foam place Full-Size Plans Available. See Page 202 U BALSA EADING EDGEI/IA BALSA SHEET TOP B BOTTOMI/B PLY DIHEDRAL BRACES3/IA BALSA SHEET OF LEADING EDGE B CENTER SECTION 16 PLY DISKSWING PLAN TOP VIEWGUSSET BOTTOM ONLY A---ALIII7W1111-U5-SII-ILS r-j4 v- LVL ffiE 2Izz __Li y-A LSA I/4SO BAL WNGSHEET TIP I/IA PTPLY O CLIPS PARS TO B BOYTOM AP LO ~ OOJBER -- -ALERONIB DIG RACESI/B PLY SERVO E LS MOUNT ~{-LOCATION V-h--J -H-1 H t Y 1r --H-V Lffi~i-H- ---i ---- II~ -L ----_ IS BRASS TSBE 3/30 DIATYPICAL HINGE I/HBALSA T ESTOCMOSIC WIRELOCATION3/IA BALSA SHEET I/B PLYWOODI HINGE 3/16 50 BALSA T E/BPYDIHEDRALBRACESI/IA BALSA SHEET RIBS-MAKE 04-LOCATION MAKE4 I/B PLYWOOD/4 PLYWOOD B DIA MW IM 4 CENTER RIBS MAKE NTO DASHED LINE3/IA II I LEFTADNE BALSA B1T""""VIE PLY L S MOONTSHEET I/B PLY-T473WEBSMAKE 4 SERVO MOUNTL G DETAILI/IA BALSA SHEET ING NOTE DRAIN MAKE TWOGEAR S/3D BALSA SHEET SIDES----I WING RIB PATTERN FUSELAGE TOP VIEWSTABILIZER 3/32 1/4 BALSA3/IA BALSAHINGE3/IA BALSA UPRIGHTSSHEETLOCATION 1/4 DIA HARDWOOD ELEVATOR DOWELS FOR RUBBER - HORN BANS WING MOUNTINGI SHEET OOUBLERSS/IA BALSfI r S/I EGO MAPLE FORWARDMOTE GRAINI/IA BALSA SHEET TOPGREETII r -JOINER SAD BOTTOMCROSS GRAIN FIN-3/IABALSA BATTERY S/IA BALSA SHEET LLLV SHEET I/B 1/4 j D O RAIL SO BALS ~[~CU1OT -II ----STAB UBLERRUDDER I" -~=BORN 3/IA 1/4 DIA3/30K 1/4 BALSAPUSHROD ESITBALSA DOWELUPRIGHTS1/4 GO BALSASHEET PUSHROSG FUSELAGE SIDE VIEWMODEL AVIATION 3/3D BALSA SHEET FUSELAGE SIDES TWO 5-1/4DIAMOT SMOWN FOR CLARITY WHEELSDESIGNED BY L F RANDOLPH TRACING BY JOE CEMARCO 0 2 3 4 5 ALL RIGHTS RESVED covered Tail surfaces Since easiest phase its saved last Cut fin rudder stabilizer elevator 3AA sheet balsa following plan cross grained end plates stabilizer rud der should edge-glued sheet before parts cut elevator carry-through may either 3/IA doweling 3/IA-sq hardwood both work equally well Join stabilizerelevator fin-rudder masking tape hinge lines sand edges smooth round Finishing Use plastic film both cover ing model hinging movable sur faces Transparent Black Baron lightest films available used pro totype Follow manufacturers instruc tions choice film Coat firewall inside cowl matching shade epoxy paint December 1989 29 finished stabilizer elevator rudder stabilizer elevator cut trom 3A-in sheet balsa Glue hardwood elevator carry-through leading edge elevator before rudder cutout made cross-gralned stabilizer tips help inhibit warping protect areas engine exhaust oil engine mount should drilled nose gear before its bolted fire wall Install nose gear bend %-in wire main gear legs main gear held place gear mounts screws formed nylon clips 2 A-in wheels can mounted wheel collars axle holes wheels larger A-in wire shim brass tubing smooth fit steering arm through spring nose gear made piece %-in hardwood dowel small A-in plywood disk two wood screws Make pushrods elevator rudder hard A-in-sq balsa fitted threaded rod epoxied thread-wrapped both ends Select location servos bat tery inside cabin achieve centerof-gravity shown plan Run tenna through piece fuel tube bringing through cabin top top rud Continued page 156 30 Model Aviation Left The wing under construction showing As-in shims under bottom main spar allow room leading edge sheeting X marks shortened webs will allow plywood landing gear mount supports can seen glued rib Right Close-up bottom center section wing showing wing mounting bolt holes being drilled Attach top leading edge sheeting before drilling spars Dont touch dihedral braces drill After bottom sheeting place holes can completed drillingfrom top Left wing securely fixed place drilling hardwood pads fuselage wing mounting bolts Shim 7A2-in drill 1A-in brass tubing drilling pads An alternate method wing mounting installing /4-in hardwood dowels through fuselage ahead front former just behind aft formerfor mounting wing rubberbands Right Close-up hardwood wing mounting bolt pads fuselage being threaded tap Run tap way through pads achieve maximum strength Left landing gear mounts shown installed ready installation built-up mounts drilled before glued sup porting ribs makes strong lightweight mount main landing gear Right Keytwo sitting ramp ready its first flight GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation