NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet
Edition: Model Aviation - 1979/10
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
NO OCR TEXT NO OCR TEXT 15WAI5WITH5A#AECU8F AR7Y q I8-8 PROP DU-BRO PROP DRIVE UNIT BELT DRIVEN FOR 12 LBS OFTHRUST METAL OR FiBERGlASS COWL HINGES4 UMTS SPINNER SCREWS TO 1/8 PLYWOOD BACK PLATES GLUED UP CAM-LOC COWL LOCK FOR ACCESS PANEL ENTIRE ENGINE COWL IS FIBERGLASS SHELL REMOVED IN ONE PIECE METHOD OF ADDING OR REMCNING WHEELS OR PANTS - DETACH ENliRE LG WiRE FROM UNDER WING WITH GEAR IN HAND PUSH PANTS UP ALONG SLOT-TO FULLY EXPOSE WHEELS DRIVE UNIT BOLTS 41/4 PLYAOJO X THROUGH V4 PLY BOX SUPPORTS GINE K B B 61 ENGINE 1/8 PLYWOOD COWL MOUNT WEB IS GLASSED INTO CC7#IL RIM 12 OZ FUEL TANK ON FOAM BASE K MOUNT COWLING TO FUSELAGE WITH 10-243 SCREWS AND SPACERS 1/2 BALSA SEGMENTS CURVE IN AS FAIRING 1/4 PIANO WIRE AIN STRUT SECURED INTO WING BLOCKS WITH MElAL STRAPS12 Model Aviation V4 PLYWCOD BULKHEAD SANDWICHED 7 1/41 PLYWJOD B MOUNTED 10 FIREWALL WiTH FOUR BOLTS 11N T-NUTS i OR BUILTUP OD FOR LG-/ OLNCHORAGE DIA WHEELSV #OULD YOU BELEVEFUSELAGE IS HEAD HEIGHT I/4X I/2HARD BALSA LONGERONS 1/8 PLIWOD ALL BULKHEADS BALSA BLOCK 1/8 PLYWCUD DECK SUPPORTS SERVO TRAY SLIlTED WIRE INSULATION D- 3 1/8 PiYWcOD SPAR BRACE \\ I/8u WIRE BOUND TO MAIN STRUT MOLDED FIBERGLASS PANTS 1/8 BALSA SHEET LE COVER lop AND BOTTOM October1979 13 w 0 z 0 0 w z z 0 0 CD z 0 C III MJ Il//I /,/ // Iii N N N 020 AWM well-known aenbatic pilot set light plane altitude record 19800 ft May 1937 St Louis Rankm won Interna tional Aerobatic Championship stock Ryan ST-A against field especially built foreign US aerobatic aircraft ST-A sold several foreign coun tries military trainers ST-M country became PT-16 Slightly improved models larger cockpits also moved closer together supplied PT20 Menascos unsuited military training revised design using 132-hp Kinner 165-hp Kinner radial engines became famous PT-21 PT-22 series used train thousands pilots World War 2 model designed use Du-Bro Prop Drive Unit fits fiberglass cowl like glove interested Ryan ST would prefer use Quadra other converted chain saw engine would recom mend building radial engine series would simplify construction since fiberglass parts used model would needed However opinion some beauty ST-A would lost Prop Drive Unit has fitted K&B 61 has proven highly reliable easy start combination just right power realistic flight Best performance has come 18-8 prop very close scale Note use cradle hold plane inverted starting model true scale areas except landing gear landing gear made l inches short order improve ground handling reduce tendency ground looping Wing span 90 length 65 wing area 1160 sq All-up weight 15 pounds including 5 oz lead located tail cone Because its size fuselage shape large number parts required Ryan will present challenge scratch-built pattern plane Only reasonably experienced modeler willing face up variety problems during building should attempt model complexity other hand flying Ryan completely different story very easy gentle may better way putting plane fly Anyone can handle pattern trainer would have no difficulty flying Ryan study plans will see lot balsa wood has used common practice quarter scale builders make substitutions noble precious mate rial Let make few comments First what think about replacing 1/8 balsa used sheet fuselage 1/32 ply way scale seams could duplicated rather simulated have done layer light-weight fiberglass cloth resin over ply would make perfect base simulated polished aluminum surface Second 1/32 ply might substituted wing leading edge sheets Ribs could made Foamcore capped 1/32 ply way 99% balsa used would eliminated What weight penalty may occur cant answer Also whether formers longerons wing ribs would show through ply skin another question would have answered event things may consider next time around Fuselage Start tracing formers appropriate size plywood Note formers F3 Fl 1 fuselage deck made Lite Ply made Fl 3/16 ply could 1/4 ply just well Cut out area fuel tank drill three cowl mounting holes Fl FlA plan use Prop Drive Unit ply box used mount unit firewall Parts mount can cut out along formers Note use additional members inside corners Prop Drive Mount made hardwood epoxy-glued place assembling mount use plenty glue add screws additional strength fuselage top view shows two four bolts used attach Prop Drive Mount firewall Blind nuts mounted firewall purpose Sometime during latter stages construction mount should epoxy-glued well bolted firewall Eight longerons used form basic fuselage structure top bottom longerons form fuselage keel made up two 14 Model Aviation glass cowl fits Du-Bro Prop Drive like glove Large access doors have throw-out hinges right-hand door provides access needle valve fuel line locks place CamlocCowl attaches fuselage three 10-24 bolts project firewall landing gear single feature has held bacK tempted build remarkably beautiful well-proportioned airplane As see designer has engineered simple arrangement detachable normal manner complicated attachment pants struts EPCYLITE FILLETS I/8X RIBS 1/16 X 1/2 BALSA LAMINATED T EDGE 3/8X RUDGER AND FIN POSTS 1/2 BALSA LAMINATES FORM TJL CONE 1/16 X BALSA LAMINATED L EDGE ELEVAlOR HORN SOLDERED 10 WIRE BLOCK FIN BASE .SOLID BLOCK ... 5; I9 1/16X 5/8 BALSA LAMINATED LE RUDDER LINK AND HORN SHARES 1/8 BALSA PLANKINGWIRE LINK TO STEER TAILWHEEL BUlTS ONLY ON LONGERONS 1/8 SHEET ON CENTER PLANK 3/8 X ELEVATOR ENDS 3/8X BALSA SPARS I/8X BALSA RIB& V8BALSA DOUBLER 8-32 MACHINE SCREW THRU ViKOD BLOCK i/81ORQUE ROD FLAP 10 SERVO 035 WIRE IN NYROD GUDE TO SERVO 3/8X HARD BALSA SPARS 1 V 1/4. SPRUCE EDGES AILERON LINK AND BELLCRANK x ~ V8XI/4BALSA CAP STRIPS TOPAND BOTTOM 1/8 BALSA ALL RIBS 1/16 X 7/8 BALSA LAMINAT WING TiPS 1/4 XI/2 SPRUCE SPARS AT TOPAND BOlTOM EACH RIB 1/8 BALSA WEBS SPAR FRONTS October1979 15 parts directly over plans Continue ward sections right through cockpit wing areas will cut away after sheeting has applied structure started glueing formers two keels Next glue two side longerons place follow up remaining longerons working both sides simultaneously prevent distorting structure installing longerons make sure recessed below outline formers should extend above notch sanded contour former can made smooth contin uous Any flat sections left longerons may end up being visable after sheeting 1/8 ply deck installed time made full width formers runs indicated between F2 F6 1/8 balsa doublers installed next consist mainly small rectangular sections installed between formers longerons entire section between FlA F2 receives doublers sections between F2 F6 have doublers installed below deck fuselage sheeted two sections first sections runs between Fl F6 second runs F6A Fl 1 Use 4-inwide sheets butt-join over middle longerons Start forward top section alternately add sheeting side top down top sheet extends across top keel meets sides first two longerons located either side keel Follow same procedure sheeting rear section After sheeting completed sand flush overlapping balsa F 1 F 11 Next add 1/2 X 3/4 balsa sections around periphery Fl round off shown plans time protect fuselage dents nicks applying light-weight fiberglass cloth resin surface Since entire surface can covered operation made jig hold fuselage jig held fuselage off workbench permitted rota tion made form two bookends 1/420 bolt wing nuts few small pieces wood used attach jig fuselage tCIILZFhii I-I ILi iLJi III ONLS SONNETIN PLY COWL MOUNTING IINRGLONR C KPIflRGLASN IN PLUCK WMPROLANN r1tI~ I lllIj II II II II Ipop0 PLY ORION SOUGh IJ J iILiI IIIII II III II —11I IJflN FIN NP SLANG RIGS STRUT MOUNTCLOMP UN MACNA NOCYTRIS [v32][b-2-10-1-10]] -- 4 II jfI IO LOONNUTII IISOSONGII IGNG COWLIII JSOURTINGCRI RIGS INPL*CRRIII [v34][b-1-10-1-10]] LI4I~ II IIIN NALNA OGUNLNTPIOTOPN1Lc IIIN IIIIICX fOTY iiIII IiIGON TORN _____ IIII___ ii II 1-UII II II LI LL SIZE PLANS AVAILABLE SEE PAGE 12 Fl Fl 1 Just about everything done fuselage hereafter alded use jig exception tail-wheel assem bly Shape wood block inside contour lower fuselage tall section epoxy place block must take up stress tail wheel bouncing across runway during takeoffs landings Make up 1/16 X 3/4 long fiberglass control horn attach 8 32 machine screw nut lockwasher Drill clearance hole through fuselage block install control horn using loosely tightened nut installation can completed later Eventually tall-wheel control horn connected rudder horn short length wire z bends end Use inside holes link rudder pushrod should connect outside hole rudder horn Final alignment tail wheel made bolting tailwheel bracket place wing cutout bit problem because oval-shaped fuselage made up slightly oversized paper template wing section shown plans traced its outline fuselage nylon tip pen Any excess mater ial cut away easily built back up wing saddle Epoxylite wing fillet applied See Du-Bro Prop Drive Unit showing its plywood mounting box inverted K&B 61 12-ounce section E-E plans Wing alignment tank projectsthrough opening firewall 90-In plane weighs 15 pounds lageisbestaccomplishedafterthehorizontal 5 ounces lead tall cone Ship handles easily pattern trainer stab place provides artificial 16 Model Aviation N IIIIIii IIiiII IIIiiZ2 IIItiII IIIIIIii IIII HtI IIIII IIIIIIIIII ..IIIIIIIii __ iiiIIII SOUSA RE*AVERYRISIOVE - HEAVY CORSI II I/RN PLY IPSIlIFT j III II iiII ii II IIPAAPOCYLITE TILLETOI II UOEH/NMOISOIHCNORORNISPLAHERI I1. iLiiI 1- JIII - III FTUITEPLO ONCEiiiiiiIL--1/HAPIREReLACS TzIT1yl Iiic ii ii ii II II IIII---~1T7-1 u-I jZ2-/-V//---1h---SIRE MIACA ISEAM LIVER II II ii, II ___ RISE MOUNTING BlOCS I____ I~YY U.5——EPOCYL CE FILET SF10 PLACEI/S NVLSA OVUELER MET/NEON TORMENt INSTAlL MELON 00CC Ifl2PIREMOVE AfTER STRUT OCHER OCEETECO // / PATTERN/ /PlO 0P01/SUIT PLY0 ARCHF I/R EPIC -I 0 QUARTER SCALE RYAN ST-A norizon needed tor wing alignment Make sure wing mounting block thoroughly glued have also used couple long 4-40 machine screws bolt block F5 windshield made 030 clear butyl sheet frame around windshield made thin sheet fiberglass made making up cowl other fiberglass parts frame cut size cemented windshield windshield held against 5- 6-in-diameter cylinder Like coffee can best cement found Wilbolds R/G 56 glue Use glue windshield fuselage tabs shown windshield pattern used anchor windshield fuselage tabs included frame therefore slots cut fuselage receive tabs hidden frame Wing Structure laminated tips made first Since leading edge trailing edge tail sections also use laminated 5tnPS could made same time laminations made rubber-banding balsa strips over forms can made low grade plywood cardboard Cut forms inside dimension curved surfaces strips will have soaked water take tight curves After strips have thoroughly dried reform second time using epoxy glue between strips technique will yield structures strong hard wood LIoeu-up 01 IllS runsneu engine 1fl5151181i0fl ana compartment wlsn aoor SWUflQ UP snow its hinging builder prefers use Quadra etc author says radial-engine version better Construction would simplified fiberglass parts would required October 1979 17 remainder wing structure typical just about built-up wings alignment tabs ribs extend 1/8 inch below bottom spar use 1/8 scraps raise spar assembly necessary since spar located thickest part wing Incidentally airfoil modified high-lift Ritz suggest ailerons flaps cut out after basic structure has completed Locations scoring ribs facilitate cutting shown plans Use hinges hinge pins installing flaps make sure can lowered 50 degrees binding Complete wing panel up top center sheeting carve sand shape before joining much possible separate panels since 90-in wing does have way creating space problems ready join panels 3-in dihedral under panel spar R3 work bench too short borrow door somewhere fact can find right airfoil skip wing Complete center section prepare wing covering covering use light weight nylon purchased fabric store Its cost very reasonable can used just like silk Another advantage should develop wrinldes minor dork can removed heat lamp Tail Structure easiest way built tail surfaces having airfoils build flat carve sand shape after assembly exact shape critical should made symmetrical possible maximum thickness about 1/3 way back leading edge lower part rudder made 1/2-in sheet rudder control horn mounted Insert piece 1/8 ply control horn base rudder hinge line tail cone has same contour fuselage tapers rapidly contour shown section F-F hatch built tail cone access rudder elevator control horns vertical horizon tal tall sections also covered nylon FULL SIZE PLANS AVAILABLE. SEE PAGE 128iiii IIII 7 / 9 II IITABALSA S OAIC*L USCER BR Ill Ill Ill IIf Iii CS TAPER SPARSliii / U II II dl illII IIHHHjI n lB S ITS CAP STRIPS II II TB OLT IC RCA II CUTOUT eAR BOAST n II II /1 el TABB Miscellaneous The cowl attached fuselage three 1024 bolts project firewall mounting web made outline section shown C-C cut 1/8 ply glassed place web has large rectangular hole cut out clear tank J r ii II Sitting its special cradle big ship quickly fueled Large rectangles 2-in foam cutout match fuselage sections glued low ply stand keep rudder touching ground ship inverted Note easily Farrell handles crate helper Ill II II II Prop Drive Unit cowl doors attached cowling throw-out hinges shown drawing maple blocks also glassed place top screws used mount fiberglass part kept loose door made tight doors will swing out before rotating upwards After rotating fully upward cowl doors will remain position themselves right door access needle valve filler tube made held down Cam Loc fastener left door normally doesnt have opened field held shut muffler muffler Du-Bro mounted short length Du-Bro muffler extention Wing struts attached Du-Bro ball links epoxied fuselage wing balllink sockets mounted threaded wire sec tions adjusted length installed lengths K&S streamlined tubing using balsa wedges silicone rubber sealant edges tubing filed fit flush loosely against fuselage andwing edges lined leather prevent marring surfaces plane prepared painting priming acrylic lacquer primer painted 18 Model Aviation iiii IIII iiII iii CUT SLITS TO 010 REMOVAl III Ill Ill 'Ii Il[I U II liii IIQI ii -1 II ij II Th-v IH Iii IIi III III III IIII Hr tF11 nil Wi liii IIiirlil -----L IIII-- -IIIILIZIuLAuI III II IIII11liiiliiiLi III1 IIIiiIII IIIIIIIIA4I III IIIii IIIJ1141OI~j 0/ ~PT IS2 PLY SIP I1lflA III ASSES AILEROMSH SRE B RI II liiiI I1111liiiliii 1111 liiiliii sAII1 IIIII liiiill witn acrylic lacquer poly aluminum simulate polished aluminum fuselage silver-color ed wing tail surfaces lacquer plasticized adding Southern Products Flex AlL trim used insignia Mexican Air Force Profile Publications has several other color schemes can choose Conclusion As mentioned previously cradle used hold plane inverted starting also used transporting plane field assembling wing rigging cradle made two pieces 2-in styro foam cut 9 X 11 rectangles An area cut out shape section shown C-C about 6 inches deep styrofoam glued plywood stand made just high enough keep rudder off ground plane inverted position have experience inverted engines know flood easily can very difficult start Inverting plane starting prevents However tank installed usual manner must filled plane upright Hence fill tank first invert plane holding nose I VB SHEET I II02 111 II II II II II IVS BALSA SHEET II TSP S BOTTOM I-OS3 A-- I II II L I I Inverted its stand starting Ryans engine starts few flips prop author found did require starter Best performance 1 8/8close scale October1979 19 SILYBS ROUSER CCOOTROL HORS THE RYAN ST-A ________ slightly high complete assembly static engine running preflight Because fiberglass spinner use electric starter Fortunately has never needed since engine almost always starts just few flips propeller starting use Du-Bro might well say now wheels also made Du-Bro glow plug clip hooked pair 20-year-old surplus nickel cadmium batteries once used NIKE missiles clip easily stalled removed engine through cowl door After engine starts needle valve can adjusted cowl door closed before rotating plane its landing gear Takeoffs very smooth require very slight touch right rudder Flaps normally used takeoff plane will brake ground after about 100-ft run Attitude climb-out exactly like full-size light plane So far maneuvers have limited rolls loops wing overs slow fly-bys looping rolling maneuvers started first enter ing shallow dive build up speed exactly done full size ST-As flight performance very realistic Landings made adding full flaps downwind leg No change pitch noted flaps lowered flaps plane wants float landings much care must taken overshoot runway Well about sums up will conclude list sources 3-view drawings should considerable help scale drawings THREE-VIEW SOURCES 1 Profile Publications Number 158 2 American Aircrafl Modeler August 1971 3 American Modeler July 1962 4 Radio Control Modeler February 1973 5 Air Classics July 1973 6 Air Progress Winter 1962/1963 7 Harold Osborne PO Box 2033 Fullerton CA 92633 Mexican Air Force markings certainly cinch dupilcate Ship primed acrylic lacquer primer painted acryiic iacquer poly aiuminum simuiate poiished aiuminum fuselage siiver coiored wing tail surfaces Profile Publications offers variety color schemes So far author has Jimited maneuvers rolls loops wing overs slow fiy-bys No pitch change flaps 20 Model Aviation crosswind revealed frequency ribbon Tairff 1 i l ft withnt fIn llmbout uk tI~t f I addition scaie cooling openings large bottom opening insures engine wont subjected high temperatures Flaps re applied approaches isa tendency float landings care must taken overshoot Big ships surprIsingly light feet