4-60

Al____ SEQUEL hIghly-successful previous effort can often dis asterwitness some really grim sequels have seen movie theaters front TVs Frequently Goodmovie followed Goodmovie II III IV etc progressively worse seems creators have used theIr originality skill Inspiration first effort have nothing left se quls fortunately sequel outstanding origi nal version 4-60 retaIns virtues 4-40 December 1984 MA adds easier con struction higher strength smooth er aerobatics markedly-Im proved visiblilty excellent ground-handling takeoff/ landing qualities retained largerversion Important ly 4-60 handles much better moderate high wind smaller 4-40 have consistently able fly various prototypes winds have grounded conventional de signs Previous experience enlarg ing Old-Timers has taught us simple scaling up can markedly alter models flying qualities Therefore 4-60 has some van ences 4-40 developed fine-tuning series prototypes resulting 4-60 presented possesses delighiful flying char acteristics simple construction appealing lines reasons still arent clear 4-60s flight envelope Some say see Goodyear racer thIs design Others reminded home-built aIrcraft Still others thInk contemporary acrobatic full-size designs something WW Whatever 4-60ertainly attractive dinary Stick designs Just about easily built Dr DB Mathews seems broad enough al low docile trainer-like flying forward center gravity CG narrow control surface deflec tions becomes nicely aerobatic CG moved rearward throws increased wIli resist temptation say results brliliant design Ing skill actually know fortuitous combinatIon aerodynamic features Several Master-class Pattern p1lots have flown proto types have expressed great delight 4-60s agilIty smoothider its forte sport rid 60 four-stroke engine handling characteristics other end scale have encouraged several pure novices fly prototypes directly after flying flat-bottom-airfoiled trainers astounded find 4-8018 actually easier land take off trike-geared trainers beautiful concentric large loop slow rolls great success original 4-40 design seems indicate other build ers-filers also prefer sort flying design especially recom mended have graft edr-cycie engines onto fa o uses brute power consequence manet slow stately C abrupt violent special magic happens flying quiet models performing budget Side-by-side comparison shows 4-60 just simply scaied up smaiier4-40 Both specificaiiy matched totheir respective four-cycie power piants aiso perform exceiientiy two-cycie engines providing wide range usabie engine sizes/types Construction 4-60 may look bit flimsy first glance must realize spruce 10 times stronger equiv alent-sized balsa costing less Lite Ply poplar weighs about same /16 balsa has strength i balsa Lite Ply can cut smoothly knife saw cost spruce Lite Ply much lower balsa equal strength allows large model like 4-60 built little cost building conventional smaller airplane Spruce Lite Ply available local hobby shops can ordered several MA advertisers substitute spruce design balsa re gardless its density size Hardware items standard may stocked hobby dealer can order Substitutions also possible builder wishes Read text study plans until everything clear cut out kit parts transferring shapes drawings appropriate wood aid carbon paper holes should drilled time part shaped simple jigsaw such Dremel etc helpful building model though required Cutouts can made easily drilling -in holes ply thread ing saw blade hole Tabs slots can easily cut sharp model ing knife model very easy construct keep alignment Use smooth flat building surface follow sound princi ples craftsmanship assure good flight performance prototypes con structed almost entirely cyanoacrylate CyA adhesives exceptions being firewall wing joints Covering model anything other MonoKote silk recommended Fuselage sides can either cut 48-in stock cut spliced 36-in stock did splice joint plenty strong being well supported internal doub ler Make right side tracing over carbon paper onto Lite Ply Mark bulkhead slot locations time Cut out 28 Model Aviation \ A wing removed excelient access components on-board Ace Nilite iii makes engine performance totaiiy reiiabie whiie adding insignificant amountof weight DGA pilot figure iooks Out overthe Enya uu Tour-stroke engine i. U spinner 14-5 MasterAiracrew Notice Head Lock giow piug Simpie wind screen addeto iooks use pattern left side both doublers Note ply called ally 3mm slightly less s should tight fit Lite Ply Similarly trace develop other parts try fit everything before final assembly Cement doublers fire wall reinforcing landing gear blocks fuselage sides epoxy Drill -in holes F-2 assembly Without gluing fit fuselage sides F-2 F-3 middle bottom unit together noting tabs floor fit slots sides middle bottom holds unit squarely satisfied flow thin CyA joints follow bead thick CyA extra strength Fit rear bottom section adjust needed Clamp tail post together clothespins like Keep edges aligned make sure fuselage square repeat gluing sequence CyA Add turtle deck formers tail wheel mount spruce stringers Drill firewall engine mount fuel lines throttle wire Place thrust line according drawings Epoxy firewall onto sides also tri uu construction reveals Docs Free Flight RC Oid-Timer background Combination spruce spars shear webs proauces very uirong structure economythat also easyto build lightweight Right Aileron horns basswood blocks blended wina trauma edae reinforced fIberglass tape servo mounted cutout wing center simple hardwood mile Left Drilling installatIon 0 ront wing noia-aown aowels can DC aone win ns wing uuiiuu uniu uiu UDu@U ment has removable hatch Right simple Lite Ply box turtleback formers/stringers combine make sturdy attraclvu u.ije January 1986 29 umethlng about 4-60 seems whispering FIre up lets go flying have flown say makes best takeoffs landings airplane theyve flown angular stock use masking tape hold alignment epoxy sets Install fuselage front bottom section landing gear mount Tackglue block removable hatch onto top cut front segment razor saw prototype model uses two sections hardwood front Goldberg Angle Hold-Down fitting keep hatch place however popular hold-downs should job good time set up fuel tank its plumbing Sullivan 55-10 works well just sure place way top compartment Coat tank area fuel-proofer like use warmed 30-min-cure epoxy tank should set foam-rubber cocoon top battery pack Conventional cable can used throttle linkage though isnt much room between engine mount throt tle arm four-stroke engines making such linkage difficult simple length 047 music wire right-angle bend running arm makes great substi tate cable inner yellow Goldenrod should run straight throttle arm servo setup threaded coupler clevis should used servo end Temporarily install engine en gine mount glue nose blocks CyA onto firewall Make sure clear spinner backplate carve blocks whatever shape appeals Set fuselage aside work other units Tail surfaces elevator construction rather unusual very strong unit weighs ounce h-in balsa stab ply will almost cer tainly warped bit after cutouts made pinning flat building board CyA-gluing frame over will produce totally warp-free unit hinges slotted entirely balsa have never pull loose builder just cant bring himself use stab construction technique should means cut out balsa expense isnt bother Form elevators beveling fronts either rounding backs sanding whole thing airfoil shape havent able detect difference flying characteristics either way Notch drill -in music wire joiner making sure elevator ends match ends stab rudder/fin totally straightfor 30 Model Aviation Aileron torque tuDes mountec grooved bass trunnion blocks glued tothe wing trailing edge CyA Simple strong view shows wing mounting system front dowel holes rear nylon bolts simple balsa-block cowl faired spinner shape though could left squarish first glance framework iwtn ac ot extensive sneetingj may appear weak ex tensive use Lite Ply spruce make stronger open-framework structures Framed against Its natural element sky 4-60 demonstrates its strongest virtue superb flying characteristics Beginner expert alike praise its broad flight envelope 410 DOC MATHEWS ACE 4-40 CLEAR PLASTIC CANOPY3 SCALE WILLIAMS PILOT BROS 3/32 BALSA CENTER SECTION TOP S BOTTOM /4 BALSA- 10 OZ FUEL TANK 3 CB SPINNER HAYES OR TATONE MOTOR MOUNT 1/4 BALSA SHEET I/4x 1/2 BALSA 3/32 x 1-1/4 BALSA SHEET TOP AND SPARS-TOP S BOTTOM 1/8 C GRAIN BALSA 1/2 SQ BALSA LEADING EDGE 1/8 K 3/16 SPRUCE SPARS TOP ONLY 1/4 x 1/2 SPRUCE SPARS-TOP S BOTTOMN I/B LITE PLY FORMERSI ii 7 f4 I/B LITE PLY SIDES 48 STOCK EL G SH-132 LWHEEL BRACKET 1/4 SQ BALSA STABILIZER IS 1/4SQ BALSA OVER I/B LITE PLY BASE B FOUR CYCLE OS FS 61 ENGINE BATTERY 3/8 BALSA HALLCO B106-5 GEAR MOUNT WITH 4-40 BLIND NUTS AND BOLTS WHEELS ward Slot vertical horizontal tail surfaces hinges dont install hinges permanently until after covering has applied Wing Stack-cut ribs using master plywood template guide Notice two wing rib patterns required Care frilly cut spar notches spars must fit snugly thick CyA work properly wing panels mirror im ages another built flat front spar rearward Construction bottom up Pin sheet trailing edge rear center section sheeting flat work surface Position bottom spars ribs using shear webs squareness Add top trailing edge sheet spars fol lowed leading edge nose string ers Remove panel plans add center section sheeting trailing edge cap strip Build opposite panel same way making sure center ribs have angled jig dihedral Blockupthetipofeachpanel 1 inand sand bevel against flat work table edge Test fit make sure total dihedral 3 Using pre-notched bass trunion blocks make left right aileron torque rod assembly Make sure nylon tube wire before bending Grinding point aileron end wire will make easier set up later Thread nylon fitting way down rod cut off excess side cutter grinder cutoff wheel allows internal clearancevery important Apply some Vaseline rod runs through tubing will prevent glue seeping Roughen outer surface /4 PLY LANDING GEAR MOUNT FUENE ROLES 0 TWUST LINE LXKiP FOR 6/32 HISS NUTS SIJT MOL*IT 5IND BOLTS YO FW PLY BALSA COWL BRACE 3/B BALSA COWL BRACE 3CB SITNNER OS PS-El POUR CYCLE ENSINE 11002 FUEL TANK F1/2 ND WOCO NAYES OR TATONETRI- STOCK MOTOR MOUNT I/B UTE PLY FR-Il SM BALSA COWL SIDES 3-1/2 DIA WHEELS 0I5 3 4 5 B tube coarse sandpaper Notch slotted hardwood block clear torque rod also repeat wing trailing edge Hold assembly onto wing tape flow CyA onto 1W BALSA COWL SIDES Left Fuselage bottom rear formed Lite Ply section features tongueandslot alignment making practically impossible build twist Tail wheel mounting block oversized provide solid surface affixing bracket Right Four Lite Ply formers some stringers convert plain-Jane box appealing turtleback fuselage Also note location control rod exit holes 32 Model Aviation U Fe-I FRONT BOTTOM fuselage components Notice extensive use slots tabs simplify assembly assure good alignment good practice begin cutting complete kit parts /2 BALSA HATCH OUTLINE FW /F- i ir ii iIDIii FOR SPRUCEWiNS DOWE S V MOTOR MOUNTHATCH NO S DOWNSI Internal plywood doubler being epoxied fuselage side Small scraps Lite Ply placed notches alignment purposes removed before epoxy cures US BALSA HATCHU 3A6 V4 SPRUCE DOLDBERG Si HATCH NOLO DOWNS AUISLE HOLD \n\~ Full-Size Plans Available. See Page 172 I/B LITE PLY L/8 LITE 1/8 PLYWOOD C F-2A FS-2 MIDDLE BOTTOM DRILL 1/4 HIi~2B FOR WING HOWI/B PLYWOOD _________________________DOWN I--K I/B UTE PLYWOOD 78-3 REAR BOTTOM 1/2 3/4 HARDWODO TAP FOR I/4-2O F-S FUSELAGE TOP DOUBLER I/B Lilt PLY FUSELAGE SIDES F-4 VB LITE PLY F-3T 0 PIJSIROD HOLES TO SUIT F-3 I/B LITE PLY I/B Lilt PLY F- 4 I/B Lilt PLY F-S F-6 /8 UTE PLY F -6BALSA FILLER F- TYPICAL PINNED HINGE LOCAlYON1/4 BALSA SHEET 1/B Lilt PLY /4 BALSA 2 HARDWOOO SHEET RI- STOCK ACE 4-40 CLEARI/B LITE PLY1/j/ PLAGTC CANOPY3 SCALE WILLIAMSI/B LITE PLY1/4 50 SPRUCEFORMERSIIIHi FINiiuu WPP IBROS PILOTFORMERSSTRINGERSIf III FIN EXTENDS/i ___ TO PLYWOOD F-3T F43/B BALSAill 77Th F-S I-STOCKIiKIi /7/'I IIf F-fl I--i CG-II AILERON14480 WOODiiI SERVOBLOCKIGLASS CLOTH RECEIVER1: CA SERVOSC ---FOSHRODXIS SH-135 TAILWIEEL IIEXIT SCRAP BALSABALSADRACKET ON S LAUDU WALLI IFILLEROP LITE PLY F-3FB-3 I/BFLIGHT MOVEMENTSI/16MUSIC WIREI YAILWHEEL Lilt PLY PLY LG318 50 SERVORUCOER- 3/4 EACH WAY NTRAILS HDWOODELEVAYORlID UP B DOWNWEIGHT 7 LBS WING 5PM 70 AREA 840 50 IN ALERONS3/B UP B DOWN L AVIATION FB-2VB LITE PLY SIDES_______________________________________________ VB Lilt48 STOCK 4-60 PLY LOS 8106-5 4 MOUNT WITH tLIND NUTSSIDE BOLTSFUSELAGEVIEW Mn,M rtuDflrt 11* AlA LIW IN R OUTER NYROD SOLDER LEVIS ON HORN ENS B E-Z CONNECTORS ON SERVO ARMS I/B Lilt PLY DOUBLER SIIEET OF 2 FOR 4 CYCLE 60 ENGINE OR 40 60 2 CYCLE ENGINE DESIGNED S DRAWN BY DOC MATHEWS TRACING BY rOE DEMARCO ALL RIONTI RESERWD joint Carve excess basswood blend trailing edge Pin panel flat building board epoxy other panel 3-in block under its tip Make sure both panels flat Complete wing applying center section tape/epoxy thin CyA making servo well cutout ailerons beveled hinge joint rounded trailing edge Flutter problems encountered Left view fuselage box Illustrates triangular hardwood used reinforce firewall landing gear mount Two layers Lite Ply epoxied together produce super strong front end Right Removable hatch details Hardwood pegs anchor front hatch Goldberg latch secures rear Photo shows Tatone engine mount use other varieties should also work okay January 1986 33 tapered ailerons carve/sand airfoil shape hinge gap should kept minimum taped shut best aileron control response Lite Ply wing tips scrap fillers used sake economy work well have good strength quite simple construct Use a instead must Wing mounting Early prototypes 460 flown rubberbands dow els holding wing However since some fliers think rubberbands messy show bolt-on wing Mark centerline top Former F2 measure out 1/16 in. rear center wing make mark both sides top marks outer edge fuselage should sit Place wing fuselage saddle flush F2 centered mark Check rear marks alignment properly positioned hold wing tightly drill -in holes leading edge through pilot holes F2 Remove wing complete drilling way ply shear webs 6-in drill makes alignment drilling much easier shorter bit can used barely inserted chuck Round end /iin dowel sharpen other pencil sharpener Push sharpened end holes leading edge inserting way ply web leaving about king out Plenty room servos Regular inner outer Goldenrod used stance see text interesting alter native Drill holes bulkhead suit setup provide necessary anti flex bracing Servo mounting rails HotStuffed directly tothe inner Lite Ply doubler Tall surfaces have totally conventional fin rudder elevator stabilizer really unique stabs combination Lite Ply base -in balsa frame produces extremely strong lightweight unit fraction alternative sheet balsa cost fin notched front back fits slot stab frame rigidity Moving tail wheel isa simple matter tiller attached bottom rudder Although shown photo isa good idea slide small section innerGold enrod over tiller wire fIrst glue rod bottom rudder CyA CENTER SECT PLY WEB LAYERED FIRER GLASS CENTER OCCY TAPERED HAROWOUC INSET WITH EPOXY I/4 BALSA GIG SHADS I4SHEET WOOD TRLBBON BLOCK CARVED TO FIT BALSA I/B LITE PLY WING TIPS p V 3/32 I-I/4 BALSA SHEET lOP MW BOTTOML4SG BALSA TRAILING EDGE / 302 BALSA VENT GRAIN WEBS I/H I/S SPRUCE 3/3D BALSA IIS3/IBS cENTE Check fit fuselage necessary file out hole leading edge proper seating Remove wing dowels Apply some Vaseline holes F2 apply 5-mm epoxy dowels reinsert wing holes Hold everything steady epoxy sets Glue hardwood wing hold-down blocks 5-mm epoxy securely fuselage side top flush wing saddle Mark proper location holes wing Drill %6-in hole through wing block keep ing drill perpendicular top surface wing Remove wing tap blocks -20 bolts Enlarge wing holes -in dia Use nylon washers nylon bolts spread force over larger area Last things fuselage tail surfaces can covered and/or painted way builder prefers wing designed 34 Model Aviation V2 SO BALSA7 Full-Size Plans Available. See Page 172 1/5 50 BALSA LEADING EDGE I/B 3/16 SPRUCE SPARS TOP ONLY II\ ____ -~-Z 1/41/5 SPRUCE 5/35 BALSASPARS TOP B WEBSBOTTOM PLANRIGHTSIDE/452 SPRUCE BOTTOM1/8 UTE PLY zwnw 1/B BALSA BIBS Ij-- --~I __ _1--_ 3/32 1-1/4 BALSA 1/H GO BALSA I/B 3/IA SPRUCE SPARS TOP ONLY II LIGHT 4 FIBERGLASS OVERLAP 1/4 AT CENTER Iti W ~- - - PLAN LEFT SIDE 3/32 BALSA CENTER SECTION TOP S BOTTOM IL ii-II _-I---_ CGHAIN BALSA EOUI RED / 1/4 BALSA SHEET 7 TYPICAL PINNED HINGE ScRAP BALSA3/32 BALSA NOTE GRAIN WEB PATTERN CENTER RBS TO SET TIP DETAIL INST TO SCALEI 1/4 1/5 BALSA 3/B BALSA SHEET II -2 STABILIZER IS 1/4 50 TYPICAL BALSA OVER I/B LITE NED PLY RAGEPIN PLAYHINGE WHEN BOILSINS/- 1 ______ STAB 1/4 50 BALSA /8 LITE PLY 3/32 MW JOINER BALSA STABILIZER MAY BE BUILT PROM 3/B MED BALSA SHEET 1/4 DOWEL RING HOLD SOWN I-I/S FIBERGLASS CENTER SECTION OVERLAP AT CENTER SPRUCE SPARS-TOP BOTTOM SERVO CUT-OUT ON BOTTOM SERVO RAIL TILT THIS RIB WITH DIHEDRAL TEMPLATE SO SPRUCE SPARS TOP B BOTTOM TAPERED HARDWOOD INSET WITh EPOXY AC MR-14 AlL HORN IN TUBE UNIT I/B CGRAIN BALSA MAINRIBlB RESSIRED GWPTI 3 AF 3 LITE PLY CENTER WING WEB MODEL AVIATION 4-60 FOR 4 CYCLE 60 ENGINE OR 40 CYCLE ENGINE DESIGNED 5 DRAWN BY DOC MATHEWS MonoKote silk covering other material may too flexible Once 4-60 covered its time install hardware adjust balance position Servos can secured i sq basswood rails Pushrods can several types solid stick flexible rod etc preference 46-in music wire running inside inner outer Goldenrod type affected temperature changes very simple install requires two braces prevent flexing use EZ connectors servo ends solder links horn ends course wire should filed flat EZ connector screw safety measure have never loosen flight Z-bends could also used servo ends gluing tail onto fuselage necessary cut away some covering material joints Just make sure edges well adhered Its best cover triangular braces before installing Make sure everything perpendicu lar adjoining structure Subsequent photographing con struction model found rather neat way operate tail wheel short length inner Goldenrod can roughened CyA-glued rudder further strength ened strip CyA-applied glass cloth pieces necessary wing tail surfaces two rectangular pieces juSt below ribs tapered hardwood inserts through wingmounting bolts pass January1986 35 IL Left Wing ribs stacked checked spar fit stacksanded Notches need snug good adhesion CyA Right wing builds flat main spar back Shear webs used position ribs Notice inboard rib has tilted dihedral Len aaiiion top spars ana center section sheeting completes wing assembly trailing edge cap provides seat aileron hinges Its simple wing construct warps Right Make necessary servo well cutout foryourservo mount bass rails MonoKote over gives neat tube-and-tiller operation much danger tearing loose rough handling canopy stock unit Ace RC can obtained mail larger WW II canopy fronts could also used pilot figure can fine ones currently being offered sale An excellent adhesive installing pre trimmed canopy R/G 56 dress edges trim tape Prepping flight balance point shown drawings middle main spar starting point Recommended control surface deflections rudder elevators own ailerons own measure ments widest part surface engine should run home set high low ends throttle obtain reliability Range-check radio sure control surfaces op erate smoothly proper direction Adjust wheels needed until model will roll straight ahead larger wheels work better grass runways Once everything just right charge batteries over night preparation flying next day Depending bit model weight alti tude temperature humidity 13-5 13-6 prop good starting point aerobatics setup rearward balance point seems work best 14-5 prop individual flier should experiment bit get prop best matches model flying style Flying model four-cycle engine much different two-cycle engine takes constant self-reminding low throttle though sound level seems say Four-cycle engines seem sort shift gears under flight loads rather bogging down sound unlike semitrailer truck down-shifting model working its way through maneuvers aural deception makes unwise set needle valve four-cycle engine ear tachometer almost mandatory get best setting 4-60 prototypes flown two-cycle 40 Schnuerle porting Performance bit sluggish though satisfactory sport hack same model also flown sport 60 twocycle although flew well noise level distracting tests certainly showed model suitable wide range power plants Lets fly Start up engine point models nose wind add just touch right rudder until 4-60 gains bit speed watch take off its own no problem has about easiest tail-dragger take off land anyone has ever flown Only deliberate hamhanded effort oould possibly ground loop Seemingly isnt critical speed would snap roll warning absolute klutz would have work mess up final landing approach flier making transition trainer flat-bottom airoil will find slowness flight envelope nearly ideal learns execute outside loops rolls snap rolls spins inverted flight hori zontal eights As fliers skill increases balance point can moved rearward steps screwing Sig lead weights tail post aerobatic figures will tighten up become brisk hands experienced flier 4-60 will squiggles bumps done piped two-cyclebut slowly about eight-point rolls slow enough rate can counted out loud point 4-60 presented smaller 4-40 may well deceptivelooking designs around look like trainers possess flying qualities satisfying wide range experience levels 36 Model Aviation completed wing judicious use shear webs spruce spars Dit strong built more-conventional manner have bulit RC Sailplane wings will have no trouble recognizing similar construction techniques used