Thinking Big

a long ti dare now design driving Iustrial er mple Woria propdrive Top Flite w Mr Cra aars mples pro single image s as opposed f large er about 5 itS geared vhat type wh tation 1 variety po plane slow fi3 exciting stimulat wd pleasing ing ego ilder Since ultin -sport relaxing rigors earn oig model has mucn mater re growing n t individual e engine/prop job high really ra Mi n 60 turr trust give eriences witt naches vt help suggest plane Eight feet i hie simulta compared es 86-in st large a cabin t Id prodi bits p cigarettz acquirem sno ared constru urpla come iably d wc mu ped Ing Ivey num co Itel Its burnin coIyoetm engine tul models II engines nj built Big planes require different building techniques An examination broken stab made obvious balsa going stand up stresses applied during mild aerobatics surfaces being large area compared section Un less used huge chunks balsa hu miliated sense scale construction Other ways found acquirement several EAA mag azines Sport viation offered some light methods used home-builder full-sized airplanes opened new door building techniques purchased such magazines Horn ebuilt others contained drawings construction photographs Enlightened tech niques displayed new approach design construction large models became exciting flying envisioned miniature aircraft rather models instance spent hours devising shock-absorbing landing gear neces sary preserve nose model size mainly adhering familiar tech niques used smaller models may have suitable small models inadequate planes spanning eight nine feet Now minia ture copy J-3 type landing gear easily achieved worked just real did authentic necessity aircraft survive Left Why build big can adjust needle valve bend ing overas Dave Gray does builds cardboard designs spans big 9 10 feet Weight about 17 pounds power used OS Goldhead 60 driving 22/9 prop means Du-Bro reduc tion drive unit Above Grays latest reflects growing familiarity cardboard yield eye-appealing contours Ailerons used sport planesthey would superfluous Wing panels wire braced both ships shown Both rudder elevator cable operated Really big airplanes dont have scale models complicated expensive just delightful realistic flying looking cardboard Goliaths spans lift built boys Du-Bro point way what can done prosaic material exception equipped new prop-drive unit recently introduced Du-Bro exception 8 Model Aviation Shown Toledo Show Midwest Industries farm machinery man ufacturer new model business 86-in Mustang bulks much larger its span suggests Some idea bulk may cylinder head 60-size engine jutting out near bottom nose engine geared down 4-bladed 24-in diameter 12-in pitch prop turns 3000 rpm 15-16 lbs thrust almost equal gross 17 pounds prop given apparently barrier developing rpmat least takes lot hp special tandem twin Webra Speed turned 3800 put out 25 pounds thrust Moki 120 achieved 22 lbs Planes big dont fly like pattern jobsmuch real istic about 55 mph Standard servos suffice Kraft KPS-16 retract servo used flaps fuselage fiberglass shell wings skinned foam Midwest located Ida Grove Iowa study J-3 landing gear its func tion plus little thought should enable produce good workable duplicate Contrary opinion ordinary soft sol der can used units fabricate stainless steel fittings attaching landing gears wing struts Hard brass thin-gauge steel also has used successfully Another useful material -in thick-walled copper tub ing sold plumbing outlets used secure landing gear legs fuselage fittings copper tube cut about 1 I/4 long slotted end about /8 down its length flattened slightly filed round drilled through slots take nut bolt tubing sweat soldered end landing leg attachment its appropriate fuse lage fitting Bungee cord can suitable rubberbands turn can neatly covered canvas real ones See Spirit St Louis plan June issue basic fuselage large model should constructed so-called hard wood hardwood has spruce myth have used several types woods find good straight grained pine some applications cedar excellent substitute ex pensive elusive Sitka spruce built saw table -in ply top 26 6 length An ordinary 7-in ply wood blade used cutting s/s- 1 1-ft 21Y2-lb ship built Art Schmalz before drive-unit existed flew well 05 Max 80 turn ing 14/6 prop prop-drive equipped craft fly beau tifullya 22/9 prop develops 15 pounds thrust models made 200-lb test corru gated cardboard strong stronger balsa build fastwings require four hours includ ing painting wood used firewall land ing gear bracing servo mounts also serve sup ports wing aft trailing edge wood em ployed tail-skid mount hinge lines fin stabilizer White pine OK Du-Bro 6-in wheels take up much landing shock no spars wing Corrugations keep stiff four cardboard ribs wing panel draw back cardboard expands contracts humid ity changes control wires cables have adjustable varying weather conditions isnt bad view quick building virtually no cost airframe make super trainers might consider expendable What next Well Art Schmalz building sport bi plane 9- 10-ft wings will stand about 40 off deck weigh about 20 pounds boys becoming adept cardboard able wrap-around leading edge round off edges tail surfacesand bend round sections fuselage Cardboard has become downright attractivel August1977 9 big terms span 60 Cosmic Wind Minnow big airplane other sense kitted CB Associates epoxy fiber glass fuse cowls wheel pants supplied Prather Products aircraft ideally suited new proposed rules 61 cu Formu la Pylon event Jerry Nelson hand st Weight 8 12 pounds wing area 806 sq Designed Schnuerle 61 power up will take new large engines Actually four different airplanes can dup licated kit others being Little Toni Ballerina Filly Firm also produces 1h-size Little Toni Shoestring Rivets ready summer Little Mike follow information Minnow write CB Associates 21658 Cloud Way Hayward CA 94545 pro posed rules Bob Seigelkoff same address ins plane Ofl cover Art Schmalzs 11-foot 21-1/2 pound monster flies very well Max 80 driving 14/6 prop made before Du-Bros prop drive unit existed wide range finishing materials may used Below Reminiscent Bull Pup Bob Bentleys 10-foot two pitter Weighing 20 pounds powered Du-Bros prop drive unit Engin Supertigre Saturn 60 prop 22/9 Noticeable tape over cardboad nm A- 3/16- sq lengths blade slot table has trap door arrangement order exchange blade sand ing disc straightedge arranged apply just enough tension strips sanding couple evenings can make enough longerons wing-spar strips length want con struct several aircraft realize lamination old stuff builders 1/64 1/32 1/16 plies known re strict plywood covering foam wings forming plywood fuselages Lets examine some plywoods other applica tions large airplane can readily sliced long strips laminated form strong light wing tips out lines stabs elevators fins rudders cut off about 100 blocks 3/s sq pine about inch long drill insert finishing nail used press laminations together bent around perimeters material great facing instrument panels can polished length brass tubing correct diameter filed sharp end will easily neatly cut out instrument holes re quired various dials excellent doublers nose especially portion happened sheet aluminum real plane Thin-gauge aluminum sheets usually can asking various print ing establishments used once printers generally disposed cleaned off roughened side can cut required shape contact cemented plywood little trouble wish emboss aluminum neat little circles Spirit St Louis plan easier think cut off about 3 1/4 dowel using cyanoacrylate cement Krazy Glue Jet etc laminate two discs rub ber about eter cut inner tube tire bonding top dowel something like toad stool bonded similar disc garnet paper using contact cement spar ingly Change garnet wears Chuck tool drill practice few circles overlapping make con tinuous design look some full-sized homebuilt methods framing fuselage will see upright joins top bottom longerons triangular half-round oblong plywood fillet results exceedingly strong joint necessary wooden air craft design except sides fully sheeted applies minia ture airplane using hardwood framing necessary fullsized machine use 1/32 ply joint both uprights cross members 10 Model Aviation Above second authors miniature planes 8-ft original increased 10 ft Powered OS 80 inside cowlvisible cylinders apparently dummies Below yet flown time writing authors second Porterfield spans 9 ft 3-1/2 Powered Aerotec first OS 80 weighs 15 lbs Its predecessor could loop 05 80 have think twice say big Pitts Marion Coles air-show job actually one-third scalethree tip-to-tip equal real machine Yet span just 80 inches Joe Ziomek right Andy Sheber Andys ship shown Jim Hollands air-show PiUs life-like 5-color schemeit will appear next Circus Circus affair Although hefty mod el has flown successfully Fox 78 17/4 prop now flies 1A cu Rop er/Kolbo/Korp conversion turns 20/5 prop 7500 rpm Tank holds 32 oz fuel Weight 19 lbs Takeoff requires 50 fL moderate rate climb rolls loops flies inverted realistic landings thanks power control Plans vacuum formed parts available both 1/4 1/3 scale ver sionsfrom Joe Ziomek 17824 Country Club Dr Livonia Ml 45154 feather edges sanding adds realism article Canadas MAAC magazine Dick Phillips stated spent something like $20 building air frame eight-foot plane cost him $40 cover shocked cost airframe used consideration covering comparative incidental calculated cost covering airplane size using known cover ing materials rebellious price asked yard flimsy covering ma terial unbelievable thought over covering material problemapplicationwise weight-wise cost-wise-and answer nylon purchased few yards textile store covered airplane nylon brought covering price sensible level easy work doped well framework filling coats clear dope cut 50-50 usual amount talcum powder added best method apply first coats sponge mean cutting off 6 X 4 piece sponge rub ber dipping dope draw ing across covering material fills quickly evenly However nylon some defects small areas about inch square defy dope fill ing Another its tendency sag little damp weather although returns normal drier air present discovered world polyesters material mostly used lining drapes coats jackets etc 65 yard 48 wide cheaper nylon difficulty ma terial applying framework dope tended spring up places what did work very well deed contact cement cut out covering apply contact cement outer perimeter wing fuselage section lay polyester Use Gel contact cement because other stuff can pretty stringy now can lift stretch polyester until have smooth taut covering Now go over cemented areas heat iron cure cement covering complete let stand 24 hours pass iron over surfaces wrinkles fold lines small creases will disappear Dont iron too soon might draw material cemented area cause sagging Another product usually found drug stores Scotch-brand hair-set tape produced 3M company item originally intended hold wifes curls place tape pinked along both edges 300 long /2 wide semi-sticky side aircraft around 1925 used pinking tape cover over rib stitch ing two lengths covering met such down fuselage sides Around wing perimeter scale-like helps hide unevenness covering trimmed real spoked wheels generally covered Pass hot iron over tape insure canvas sometimes aluminum discs firm bond decided practical approach problem suitable wheels result method size large enough suit scale type could produced fulfilling above acceptably light functionally strong requisites approached problem too drawing must made proangles list smaller scale 2 in- posed wheel elevation to-the-ft WWI airplanes fabricated showing both sides wheel lookpassable spoked wheels method ing its edgethat includes tire rim appeared Dave Platts Scale sides hub method re Hand RCM August 69 However Continued page 92 August1977 11 Above The Quadra mounted authors giant aircraft Props 16- 17- 18-in diameter 6-in pitch available manufacturer IR Shettler Ent Below Aerotec used author 9 ft 3-in Porterfield converted glow ignition rated about 2-1/2 hp Tank used isa 20-os plastic bottle assistant allowed hold air plane Most Loops After airplane air borne trimmed out pilot indicates ready attempts loops can 30 seconds Usu ally about 11 loops wins Bomb Drop Five-ounce Dixie cups mounted fuselage top near wing root rubberbands Bombs prepared putting flour small square tissue holding top together small piece tape Bombs released cup pulling up airplane giving blip down elevator can give contestants added incentive hav ing contest director stand middle target Team Race Four-man teams drawn randomly attention frequency con flicts four airplanes placed starting line signal watch started first team member starts engine takes off flies around pylon about 200 yards away flies back over starting line time next man signaled same thing Time stops last mans airplane passes over starting line Team members help other get started coordinate land ings behind starting line about some ideas Ron Van Putte 12 Connie Dr Shallmar FL 32579 Thinking Big/Crawford continued page 11 quires two slabs wood least er circumference wheel least 1 thick Chuck faceplate wood lathe mark out tire rim section hub can turn shape required wood forming side wheel finished should have plugs cor responding outside shapes re quired wheel some wheel types both sides iden tical therefore plug would required Sand wax polish plugs lay up sufficient fiberglass resin depending type size form wheel sides set up re move lay up second Now trim excess glass tire rim sand down edges Drill axle holes put two halves together measure exact distance between both faces holes located small sliver wood through hole touching opposite face will give correct distance allowing fiberglass thickness true wheel turns depends upon accuracy lining up axle have used broomstick cut fit between holes hub turn drilled brass tube shaft inserted Allow brass tube project both sides wheel have hub place resin well two rim edges will now come together resined wrapped couple times fiberglass tape resin set up cut off protruding brass tube about /8 clear wheel hub Make several saw cuts across ends protruding tubes tap down segments around hub perimeter whole wheel can now sanded smooth length dowel through axle hole will help point tires cut rubber tubing circular sponge rubber used industry expansion joints Measure cut tire carefully tight fit cement two ends together cyanoacrylate tires mounted drop glue around perimeter tire rim will insure close relationship airplanes using cables con trols superb substitute dial cord sold radio accessory outlets method use install cables make up two small wooden blocks drilled halfway epoxied side fuselage bearings Between length brass tube generally 3/16 carries bellcrank fit tube blocks before epoxy bellcrank vertical line center fore-and-aft line fuse lage tubing provided arm side turn carries con necting arm servo allows elevator cables run down center fuselage servo mounted side also allows rudder servo mounted centerline have found helpful put little ten sion elevator crank assist servo pulling elevator up di rection rubberband will suffice make sure does overload servo Baby Ace 9 feet rib built up 1/8 sq spruce cableoperated aileronsas did full-size machinethat ran through small pulley wheels duplicated plane full-size plans including aluminum wing tips aluminum-sheeted leading edge large 92 Model Aviation belicrank installed near wing root cables led through pulley wheels aileron horns cable will remain taut wing halves disassembled fuselage servo connecting arm led end bellcrank out through root rib have used plastic tube bent right angles epoxied braces lieu pulley wheels course simpler Both methods work equally well commercially available fuel tanks suitable using larger en gines such Aerotec Quadra sources plastic bottles suitable needs Tanks edsily made up especially stick-a-tube method used Aerotec engine used 20-oz plastic bottle Quadra runs gasoline made up metal tank works very well could conceivably reduce possibility fire event serious crash Propellers fairly easy carve cluding laminated provided proposed prop laid out properly blank cut accurately close attention paid washout good sanding disc mounted headstock will easily shaping However owing availability good large props fair price hardly worth carve own except satisfy creational desires Whether bought home-made propellers should well balanced before use nearly cases hinges used flying surfaces miniature copies particular airplane being built Some surprisingly simple Others take little work form draw attention airplane field believe serious approach successful construction large miniature airplane must develop technique whereby concentrate total effort sound constructional meth ods applying whatever part project required manufac ture wheel hinge prop machine gun instruments coverings building techniques thorough investigation various construction possibilities should undertaken Effort direct ed manufacture item just complete program SOURCES Du-Bro Products Incorporated wauconda IL 60084 R Shettler Ent Pottery Road RR 3 Vernon BC Canada Kolbo Korp 230 N Crescent way Unit H Anaheim CA 9280 ja Homers Sales Dixie Highway Beecher IL 60401 Aerotec Model Engineering Co. Box 116 Lincolndale NY 10540 Btice Machine Specialties 8229 Compton Blvd. Paramount CA 90723 Midwest Industries Inc Ida Grove IA 51445 Hobby Shack 18480 Bandilier Circle Fountain valley CA 92708 world Engines 8960 Rossash Ave Cincinnati OH 45236 Model Rectifier Corporation 2500 woodhridge Avenue Edison NJ 08817 Fox Manufacturing Company 5305 Towson Ft Smith AR 72901 Also line propellers Cloudster/Shipp continued page 48 side Cloudster does appear sailplane Rather has lines 2-place Formula racer such animal made Perhaps reason test pilot Ray Cote owner pilot famous Shoestring racer comfortable Cloudster ever got involved soaring craft being built, thoroughly enjoys work test pilot often flying longer required just sheer fun Viewing craft underneath flies overhead reveals long tapered wing takes clean lines efficient sailplane type design landing gear received much consideration Most European motor gliders have single re tractable wheel fuselage sup porting outrigger wheels dangling wings requires pilot learn new ground handling techniques Ryan happy about Also taxiing low wing tips must carefully watched prevent hitting obstructions such boundary lights Ryson engi neers considered types landing gearssingle wheel bicycle arrangeAugust 1977 93 PROP DRIVE UNITi THIS SMOOTH RUNNING BELT DRIVEN UNIT OPENS UP WHOLE NEW DIMENSION IN 2 SCALE SPORT AND SCALE MODELS Now can build big have scale size working prop too Designed accept 60 size engine t unit will easily power airplanes weighing 20 lbs Now big old-timers extra large cowls arent impos sible anymore MAKES YOUR BIG AIRPLANE LOOK AND SOUND MORE REALISTIC @2022 AND 24 WOOD PROPS ARE AVAILABLE AT YOUR DEALER OR DIRECTLY FROM GRISH BROS OSLOW POWERFUL FLIGHT IS ACHIEVED WITH THIS UNIT MAKING THOSE OLD TIME AIRCRAFT EXPECIALLY REALISTIC 0 RPMS RANGING FROM 600 TO 5000 DEPENDING ON ENGINE AND PROP COMB 0 THIS UNIT COMES COMPLETELY ASSEMBLED READY FOR ENGINE INSTALLATION CAT NO 210 unit being used Dave Grayu u eruuoaro sport plane 0 S Max Goidhead engine 22-9 prop $10000 DU-BRO PRODUCTS INCORPORATED 480 Bonner Road Wauconda Illinois 60084 USA

a long ti dare now design driving Iustrial er mple Woria propdrive Top Flite w Mr Cra aars mples pro single image s as opposed f large er about 5 itS geared vhat type wh tation 1 variety po plane slow fi3 exciting stimulat wd pleasing ing ego ilder Since ultin -sport relaxing rigors earn oig model has mucn mater re growing n t individual e engine/prop job high really ra Mi n 60 turr trust give eriences witt naches vt help suggest plane Eight feet i hie simulta compared es 86-in st large a cabin t Id prodi bits p cigarettz acquirem sno ared constru urpla come iably d wc mu ped Ing Ivey num co Itel Its burnin coIyoetm engine tul models II engines nj built Big planes require different building techniques An examination broken stab made obvious balsa going stand up stresses applied during mild aerobatics surfaces being large area compared section Un less used huge chunks balsa hu miliated sense scale construction Other ways found acquirement several EAA mag azines Sport viation offered some light methods used home-builder full-sized airplanes opened new door building techniques purchased such magazines Horn ebuilt others contained drawings construction photographs Enlightened tech niques displayed new approach design construction large models became exciting flying envisioned miniature aircraft rather models instance spent hours devising shock-absorbing landing gear neces sary preserve nose model size mainly adhering familiar tech niques used smaller models may have suitable small models inadequate planes spanning eight nine feet Now minia ture copy J-3 type landing gear easily achieved worked just real did authentic necessity aircraft survive Left Why build big can adjust needle valve bend ing overas Dave Gray does builds cardboard designs spans big 9 10 feet Weight about 17 pounds power used OS Goldhead 60 driving 22/9 prop means Du-Bro reduc tion drive unit Above Grays latest reflects growing familiarity cardboard yield eye-appealing contours Ailerons used sport planesthey would superfluous Wing panels wire braced both ships shown Both rudder elevator cable operated Really big airplanes dont have scale models complicated expensive just delightful realistic flying looking cardboard Goliaths spans lift built boys Du-Bro point way what can done prosaic material exception equipped new prop-drive unit recently introduced Du-Bro exception 8 Model Aviation Shown Toledo Show Midwest Industries farm machinery man ufacturer new model business 86-in Mustang bulks much larger its span suggests Some idea bulk may cylinder head 60-size engine jutting out near bottom nose engine geared down 4-bladed 24-in diameter 12-in pitch prop turns 3000 rpm 15-16 lbs thrust almost equal gross 17 pounds prop given apparently barrier developing rpmat least takes lot hp special tandem twin Webra Speed turned 3800 put out 25 pounds thrust Moki 120 achieved 22 lbs Planes big dont fly like pattern jobsmuch real istic about 55 mph Standard servos suffice Kraft KPS-16 retract servo used flaps fuselage fiberglass shell wings skinned foam Midwest located Ida Grove Iowa study J-3 landing gear its func tion plus little thought should enable produce good workable duplicate Contrary opinion ordinary soft sol der can used units fabricate stainless steel fittings attaching landing gears wing struts Hard brass thin-gauge steel also has used successfully Another useful material -in thick-walled copper tub ing sold plumbing outlets used secure landing gear legs fuselage fittings copper tube cut about 1 I/4 long slotted end about /8 down its length flattened slightly filed round drilled through slots take nut bolt tubing sweat soldered end landing leg attachment its appropriate fuse lage fitting Bungee cord can suitable rubberbands turn can neatly covered canvas real ones See Spirit St Louis plan June issue basic fuselage large model should constructed so-called hard wood hardwood has spruce myth have used several types woods find good straight grained pine some applications cedar excellent substitute ex pensive elusive Sitka spruce built saw table -in ply top 26 6 length An ordinary 7-in ply wood blade used cutting s/s- 1 1-ft 21Y2-lb ship built Art Schmalz before drive-unit existed flew well 05 Max 80 turn ing 14/6 prop prop-drive equipped craft fly beau tifullya 22/9 prop develops 15 pounds thrust models made 200-lb test corru gated cardboard strong stronger balsa build fastwings require four hours includ ing painting wood used firewall land ing gear bracing servo mounts also serve sup ports wing aft trailing edge wood em ployed tail-skid mount hinge lines fin stabilizer White pine OK Du-Bro 6-in wheels take up much landing shock no spars wing Corrugations keep stiff four cardboard ribs wing panel draw back cardboard expands contracts humid ity changes control wires cables have adjustable varying weather conditions isnt bad view quick building virtually no cost airframe make super trainers might consider expendable What next Well Art Schmalz building sport bi plane 9- 10-ft wings will stand about 40 off deck weigh about 20 pounds boys becoming adept cardboard able wrap-around leading edge round off edges tail surfacesand bend round sections fuselage Cardboard has become downright attractivel August1977 9 big terms span 60 Cosmic Wind Minnow big airplane other sense kitted CB Associates epoxy fiber glass fuse cowls wheel pants supplied Prather Products aircraft ideally suited new proposed rules 61 cu Formu la Pylon event Jerry Nelson hand st Weight 8 12 pounds wing area 806 sq Designed Schnuerle 61 power up will take new large engines Actually four different airplanes can dup licated kit others being Little Toni Ballerina Filly Firm also produces 1h-size Little Toni Shoestring Rivets ready summer Little Mike follow information Minnow write CB Associates 21658 Cloud Way Hayward CA 94545 pro posed rules Bob Seigelkoff same address ins plane Ofl cover Art Schmalzs 11-foot 21-1/2 pound monster flies very well Max 80 driving 14/6 prop made before Du-Bros prop drive unit existed wide range finishing materials may used Below Reminiscent Bull Pup Bob Bentleys 10-foot two pitter Weighing 20 pounds powered Du-Bros prop drive unit Engin Supertigre Saturn 60 prop 22/9 Noticeable tape over cardboad nm A- 3/16- sq lengths blade slot table has trap door arrangement order exchange blade sand ing disc straightedge arranged apply just enough tension strips sanding couple evenings can make enough longerons wing-spar strips length want con struct several aircraft realize lamination old stuff builders 1/64 1/32 1/16 plies known re strict plywood covering foam wings forming plywood fuselages Lets examine some plywoods other applica tions large airplane can readily sliced long strips laminated form strong light wing tips out lines stabs elevators fins rudders cut off about 100 blocks 3/s sq pine about inch long drill insert finishing nail used press laminations together bent around perimeters material great facing instrument panels can polished length brass tubing correct diameter filed sharp end will easily neatly cut out instrument holes re quired various dials excellent doublers nose especially portion happened sheet aluminum real plane Thin-gauge aluminum sheets usually can asking various print ing establishments used once printers generally disposed cleaned off roughened side can cut required shape contact cemented plywood little trouble wish emboss aluminum neat little circles Spirit St Louis plan easier think cut off about 3 1/4 dowel using cyanoacrylate cement Krazy Glue Jet etc laminate two discs rub ber about eter cut inner tube tire bonding top dowel something like toad stool bonded similar disc garnet paper using contact cement spar ingly Change garnet wears Chuck tool drill practice few circles overlapping make con tinuous design look some full-sized homebuilt methods framing fuselage will see upright joins top bottom longerons triangular half-round oblong plywood fillet results exceedingly strong joint necessary wooden air craft design except sides fully sheeted applies minia ture airplane using hardwood framing necessary fullsized machine use 1/32 ply joint both uprights cross members 10 Model Aviation Above second authors miniature planes 8-ft original increased 10 ft Powered OS 80 inside cowlvisible cylinders apparently dummies Below yet flown time writing authors second Porterfield spans 9 ft 3-1/2 Powered Aerotec first OS 80 weighs 15 lbs Its predecessor could loop 05 80 have think twice say big Pitts Marion Coles air-show job actually one-third scalethree tip-to-tip equal real machine Yet span just 80 inches Joe Ziomek right Andy Sheber Andys ship shown Jim Hollands air-show PiUs life-like 5-color schemeit will appear next Circus Circus affair Although hefty mod el has flown successfully Fox 78 17/4 prop now flies 1A cu Rop er/Kolbo/Korp conversion turns 20/5 prop 7500 rpm Tank holds 32 oz fuel Weight 19 lbs Takeoff requires 50 fL moderate rate climb rolls loops flies inverted realistic landings thanks power control Plans vacuum formed parts available both 1/4 1/3 scale ver sionsfrom Joe Ziomek 17824 Country Club Dr Livonia Ml 45154 feather edges sanding adds realism article Canadas MAAC magazine Dick Phillips stated spent something like $20 building air frame eight-foot plane cost him $40 cover shocked cost airframe used consideration covering comparative incidental calculated cost covering airplane size using known cover ing materials rebellious price asked yard flimsy covering ma terial unbelievable thought over covering material problemapplicationwise weight-wise cost-wise-and answer nylon purchased few yards textile store covered airplane nylon brought covering price sensible level easy work doped well framework filling coats clear dope cut 50-50 usual amount talcum powder added best method apply first coats sponge mean cutting off 6 X 4 piece sponge rub ber dipping dope draw ing across covering material fills quickly evenly However nylon some defects small areas about inch square defy dope fill ing Another its tendency sag little damp weather although returns normal drier air present discovered world polyesters material mostly used lining drapes coats jackets etc 65 yard 48 wide cheaper nylon difficulty ma terial applying framework dope tended spring up places what did work very well deed contact cement cut out covering apply contact cement outer perimeter wing fuselage section lay polyester Use Gel contact cement because other stuff can pretty stringy now can lift stretch polyester until have smooth taut covering Now go over cemented areas heat iron cure cement covering complete let stand 24 hours pass iron over surfaces wrinkles fold lines small creases will disappear Dont iron too soon might draw material cemented area cause sagging Another product usually found drug stores Scotch-brand hair-set tape produced 3M company item originally intended hold wifes curls place tape pinked along both edges 300 long /2 wide semi-sticky side aircraft around 1925 used pinking tape cover over rib stitch ing two lengths covering met such down fuselage sides Around wing perimeter scale-like helps hide unevenness covering trimmed real spoked wheels generally covered Pass hot iron over tape insure canvas sometimes aluminum discs firm bond decided practical approach problem suitable wheels result method size large enough suit scale type could produced fulfilling above acceptably light functionally strong requisites approached problem too drawing must made proangles list smaller scale 2 in- posed wheel elevation to-the-ft WWI airplanes fabricated showing both sides wheel lookpassable spoked wheels method ing its edgethat includes tire rim appeared Dave Platts Scale sides hub method re Hand RCM August 69 However Continued page 92 August1977 11 Above The Quadra mounted authors giant aircraft Props 16- 17- 18-in diameter 6-in pitch available manufacturer IR Shettler Ent Below Aerotec used author 9 ft 3-in Porterfield converted glow ignition rated about 2-1/2 hp Tank used isa 20-os plastic bottle assistant allowed hold air plane Most Loops After airplane air borne trimmed out pilot indicates ready attempts loops can 30 seconds Usu ally about 11 loops wins Bomb Drop Five-ounce Dixie cups mounted fuselage top near wing root rubberbands Bombs prepared putting flour small square tissue holding top together small piece tape Bombs released cup pulling up airplane giving blip down elevator can give contestants added incentive hav ing contest director stand middle target Team Race Four-man teams drawn randomly attention frequency con flicts four airplanes placed starting line signal watch started first team member starts engine takes off flies around pylon about 200 yards away flies back over starting line time next man signaled same thing Time stops last mans airplane passes over starting line Team members help other get started coordinate land ings behind starting line about some ideas Ron Van Putte 12 Connie Dr Shallmar FL 32579 Thinking Big/Crawford continued page 11 quires two slabs wood least er circumference wheel least 1 thick Chuck faceplate wood lathe mark out tire rim section hub can turn shape required wood forming side wheel finished should have plugs cor responding outside shapes re quired wheel some wheel types both sides iden tical therefore plug would required Sand wax polish plugs lay up sufficient fiberglass resin depending type size form wheel sides set up re move lay up second Now trim excess glass tire rim sand down edges Drill axle holes put two halves together measure exact distance between both faces holes located small sliver wood through hole touching opposite face will give correct distance allowing fiberglass thickness true wheel turns depends upon accuracy lining up axle have used broomstick cut fit between holes hub turn drilled brass tube shaft inserted Allow brass tube project both sides wheel have hub place resin well two rim edges will now come together resined wrapped couple times fiberglass tape resin set up cut off protruding brass tube about /8 clear wheel hub Make several saw cuts across ends protruding tubes tap down segments around hub perimeter whole wheel can now sanded smooth length dowel through axle hole will help point tires cut rubber tubing circular sponge rubber used industry expansion joints Measure cut tire carefully tight fit cement two ends together cyanoacrylate tires mounted drop glue around perimeter tire rim will insure close relationship airplanes using cables con trols superb substitute dial cord sold radio accessory outlets method use install cables make up two small wooden blocks drilled halfway epoxied side fuselage bearings Between length brass tube generally 3/16 carries bellcrank fit tube blocks before epoxy bellcrank vertical line center fore-and-aft line fuse lage tubing provided arm side turn carries con necting arm servo allows elevator cables run down center fuselage servo mounted side also allows rudder servo mounted centerline have found helpful put little ten sion elevator crank assist servo pulling elevator up di rection rubberband will suffice make sure does overload servo Baby Ace 9 feet rib built up 1/8 sq spruce cableoperated aileronsas did full-size machinethat ran through small pulley wheels duplicated plane full-size plans including aluminum wing tips aluminum-sheeted leading edge large 92 Model Aviation belicrank installed near wing root cables led through pulley wheels aileron horns cable will remain taut wing halves disassembled fuselage servo connecting arm led end bellcrank out through root rib have used plastic tube bent right angles epoxied braces lieu pulley wheels course simpler Both methods work equally well commercially available fuel tanks suitable using larger en gines such Aerotec Quadra sources plastic bottles suitable needs Tanks edsily made up especially stick-a-tube method used Aerotec engine used 20-oz plastic bottle Quadra runs gasoline made up metal tank works very well could conceivably reduce possibility fire event serious crash Propellers fairly easy carve cluding laminated provided proposed prop laid out properly blank cut accurately close attention paid washout good sanding disc mounted headstock will easily shaping However owing availability good large props fair price hardly worth carve own except satisfy creational desires Whether bought home-made propellers should well balanced before use nearly cases hinges used flying surfaces miniature copies particular airplane being built Some surprisingly simple Others take little work form draw attention airplane field believe serious approach successful construction large miniature airplane must develop technique whereby concentrate total effort sound constructional meth ods applying whatever part project required manufac ture wheel hinge prop machine gun instruments coverings building techniques thorough investigation various construction possibilities should undertaken Effort direct ed manufacture item just complete program SOURCES Du-Bro Products Incorporated wauconda IL 60084 R Shettler Ent Pottery Road RR 3 Vernon BC Canada Kolbo Korp 230 N Crescent way Unit H Anaheim CA 9280 ja Homers Sales Dixie Highway Beecher IL 60401 Aerotec Model Engineering Co. Box 116 Lincolndale NY 10540 Btice Machine Specialties 8229 Compton Blvd. Paramount CA 90723 Midwest Industries Inc Ida Grove IA 51445 Hobby Shack 18480 Bandilier Circle Fountain valley CA 92708 world Engines 8960 Rossash Ave Cincinnati OH 45236 Model Rectifier Corporation 2500 woodhridge Avenue Edison NJ 08817 Fox Manufacturing Company 5305 Towson Ft Smith AR 72901 Also line propellers Cloudster/Shipp continued page 48 side Cloudster does appear sailplane Rather has lines 2-place Formula racer such animal made Perhaps reason test pilot Ray Cote owner pilot famous Shoestring racer comfortable Cloudster ever got involved soaring craft being built, thoroughly enjoys work test pilot often flying longer required just sheer fun Viewing craft underneath flies overhead reveals long tapered wing takes clean lines efficient sailplane type design landing gear received much consideration Most European motor gliders have single re tractable wheel fuselage sup porting outrigger wheels dangling wings requires pilot learn new ground handling techniques Ryan happy about Also taxiing low wing tips must carefully watched prevent hitting obstructions such boundary lights Ryson engi neers considered types landing gearssingle wheel bicycle arrangeAugust 1977 93 PROP DRIVE UNITi THIS SMOOTH RUNNING BELT DRIVEN UNIT OPENS UP WHOLE NEW DIMENSION IN 2 SCALE SPORT AND SCALE MODELS Now can build big have scale size working prop too Designed accept 60 size engine t unit will easily power airplanes weighing 20 lbs Now big old-timers extra large cowls arent impos sible anymore MAKES YOUR BIG AIRPLANE LOOK AND SOUND MORE REALISTIC @2022 AND 24 WOOD PROPS ARE AVAILABLE AT YOUR DEALER OR DIRECTLY FROM GRISH BROS OSLOW POWERFUL FLIGHT IS ACHIEVED WITH THIS UNIT MAKING THOSE OLD TIME AIRCRAFT EXPECIALLY REALISTIC 0 RPMS RANGING FROM 600 TO 5000 DEPENDING ON ENGINE AND PROP COMB 0 THIS UNIT COMES COMPLETELY ASSEMBLED READY FOR ENGINE INSTALLATION CAT NO 210 unit being used Dave Grayu u eruuoaro sport plane 0 S Max Goidhead engine 22-9 prop $10000 DU-BRO PRODUCTS INCORPORATED 480 Bonner Road Wauconda Illinois 60084 USA

a long ti dare now design driving Iustrial er mple Woria propdrive Top Flite w Mr Cra aars mples pro single image s as opposed f large er about 5 itS geared vhat type wh tation 1 variety po plane slow fi3 exciting stimulat wd pleasing ing ego ilder Since ultin -sport relaxing rigors earn oig model has mucn mater re growing n t individual e engine/prop job high really ra Mi n 60 turr trust give eriences witt naches vt help suggest plane Eight feet i hie simulta compared es 86-in st large a cabin t Id prodi bits p cigarettz acquirem sno ared constru urpla come iably d wc mu ped Ing Ivey num co Itel Its burnin coIyoetm engine tul models II engines nj built Big planes require different building techniques An examination broken stab made obvious balsa going stand up stresses applied during mild aerobatics surfaces being large area compared section Un less used huge chunks balsa hu miliated sense scale construction Other ways found acquirement several EAA mag azines Sport viation offered some light methods used home-builder full-sized airplanes opened new door building techniques purchased such magazines Horn ebuilt others contained drawings construction photographs Enlightened tech niques displayed new approach design construction large models became exciting flying envisioned miniature aircraft rather models instance spent hours devising shock-absorbing landing gear neces sary preserve nose model size mainly adhering familiar tech niques used smaller models may have suitable small models inadequate planes spanning eight nine feet Now minia ture copy J-3 type landing gear easily achieved worked just real did authentic necessity aircraft survive Left Why build big can adjust needle valve bend ing overas Dave Gray does builds cardboard designs spans big 9 10 feet Weight about 17 pounds power used OS Goldhead 60 driving 22/9 prop means Du-Bro reduc tion drive unit Above Grays latest reflects growing familiarity cardboard yield eye-appealing contours Ailerons used sport planesthey would superfluous Wing panels wire braced both ships shown Both rudder elevator cable operated Really big airplanes dont have scale models complicated expensive just delightful realistic flying looking cardboard Goliaths spans lift built boys Du-Bro point way what can done prosaic material exception equipped new prop-drive unit recently introduced Du-Bro exception 8 Model Aviation Shown Toledo Show Midwest Industries farm machinery man ufacturer new model business 86-in Mustang bulks much larger its span suggests Some idea bulk may cylinder head 60-size engine jutting out near bottom nose engine geared down 4-bladed 24-in diameter 12-in pitch prop turns 3000 rpm 15-16 lbs thrust almost equal gross 17 pounds prop given apparently barrier developing rpmat least takes lot hp special tandem twin Webra Speed turned 3800 put out 25 pounds thrust Moki 120 achieved 22 lbs Planes big dont fly like pattern jobsmuch real istic about 55 mph Standard servos suffice Kraft KPS-16 retract servo used flaps fuselage fiberglass shell wings skinned foam Midwest located Ida Grove Iowa study J-3 landing gear its func tion plus little thought should enable produce good workable duplicate Contrary opinion ordinary soft sol der can used units fabricate stainless steel fittings attaching landing gears wing struts Hard brass thin-gauge steel also has used successfully Another useful material -in thick-walled copper tub ing sold plumbing outlets used secure landing gear legs fuselage fittings copper tube cut about 1 I/4 long slotted end about /8 down its length flattened slightly filed round drilled through slots take nut bolt tubing sweat soldered end landing leg attachment its appropriate fuse lage fitting Bungee cord can suitable rubberbands turn can neatly covered canvas real ones See Spirit St Louis plan June issue basic fuselage large model should constructed so-called hard wood hardwood has spruce myth have used several types woods find good straight grained pine some applications cedar excellent substitute ex pensive elusive Sitka spruce built saw table -in ply top 26 6 length An ordinary 7-in ply wood blade used cutting s/s- 1 1-ft 21Y2-lb ship built Art Schmalz before drive-unit existed flew well 05 Max 80 turn ing 14/6 prop prop-drive equipped craft fly beau tifullya 22/9 prop develops 15 pounds thrust models made 200-lb test corru gated cardboard strong stronger balsa build fastwings require four hours includ ing painting wood used firewall land ing gear bracing servo mounts also serve sup ports wing aft trailing edge wood em ployed tail-skid mount hinge lines fin stabilizer White pine OK Du-Bro 6-in wheels take up much landing shock no spars wing Corrugations keep stiff four cardboard ribs wing panel draw back cardboard expands contracts humid ity changes control wires cables have adjustable varying weather conditions isnt bad view quick building virtually no cost airframe make super trainers might consider expendable What next Well Art Schmalz building sport bi plane 9- 10-ft wings will stand about 40 off deck weigh about 20 pounds boys becoming adept cardboard able wrap-around leading edge round off edges tail surfacesand bend round sections fuselage Cardboard has become downright attractivel August1977 9 big terms span 60 Cosmic Wind Minnow big airplane other sense kitted CB Associates epoxy fiber glass fuse cowls wheel pants supplied Prather Products aircraft ideally suited new proposed rules 61 cu Formu la Pylon event Jerry Nelson hand st Weight 8 12 pounds wing area 806 sq Designed Schnuerle 61 power up will take new large engines Actually four different airplanes can dup licated kit others being Little Toni Ballerina Filly Firm also produces 1h-size Little Toni Shoestring Rivets ready summer Little Mike follow information Minnow write CB Associates 21658 Cloud Way Hayward CA 94545 pro posed rules Bob Seigelkoff same address ins plane Ofl cover Art Schmalzs 11-foot 21-1/2 pound monster flies very well Max 80 driving 14/6 prop made before Du-Bros prop drive unit existed wide range finishing materials may used Below Reminiscent Bull Pup Bob Bentleys 10-foot two pitter Weighing 20 pounds powered Du-Bros prop drive unit Engin Supertigre Saturn 60 prop 22/9 Noticeable tape over cardboad nm A- 3/16- sq lengths blade slot table has trap door arrangement order exchange blade sand ing disc straightedge arranged apply just enough tension strips sanding couple evenings can make enough longerons wing-spar strips length want con struct several aircraft realize lamination old stuff builders 1/64 1/32 1/16 plies known re strict plywood covering foam wings forming plywood fuselages Lets examine some plywoods other applica tions large airplane can readily sliced long strips laminated form strong light wing tips out lines stabs elevators fins rudders cut off about 100 blocks 3/s sq pine about inch long drill insert finishing nail used press laminations together bent around perimeters material great facing instrument panels can polished length brass tubing correct diameter filed sharp end will easily neatly cut out instrument holes re quired various dials excellent doublers nose especially portion happened sheet aluminum real plane Thin-gauge aluminum sheets usually can asking various print ing establishments used once printers generally disposed cleaned off roughened side can cut required shape contact cemented plywood little trouble wish emboss aluminum neat little circles Spirit St Louis plan easier think cut off about 3 1/4 dowel using cyanoacrylate cement Krazy Glue Jet etc laminate two discs rub ber about eter cut inner tube tire bonding top dowel something like toad stool bonded similar disc garnet paper using contact cement spar ingly Change garnet wears Chuck tool drill practice few circles overlapping make con tinuous design look some full-sized homebuilt methods framing fuselage will see upright joins top bottom longerons triangular half-round oblong plywood fillet results exceedingly strong joint necessary wooden air craft design except sides fully sheeted applies minia ture airplane using hardwood framing necessary fullsized machine use 1/32 ply joint both uprights cross members 10 Model Aviation Above second authors miniature planes 8-ft original increased 10 ft Powered OS 80 inside cowlvisible cylinders apparently dummies Below yet flown time writing authors second Porterfield spans 9 ft 3-1/2 Powered Aerotec first OS 80 weighs 15 lbs Its predecessor could loop 05 80 have think twice say big Pitts Marion Coles air-show job actually one-third scalethree tip-to-tip equal real machine Yet span just 80 inches Joe Ziomek right Andy Sheber Andys ship shown Jim Hollands air-show PiUs life-like 5-color schemeit will appear next Circus Circus affair Although hefty mod el has flown successfully Fox 78 17/4 prop now flies 1A cu Rop er/Kolbo/Korp conversion turns 20/5 prop 7500 rpm Tank holds 32 oz fuel Weight 19 lbs Takeoff requires 50 fL moderate rate climb rolls loops flies inverted realistic landings thanks power control Plans vacuum formed parts available both 1/4 1/3 scale ver sionsfrom Joe Ziomek 17824 Country Club Dr Livonia Ml 45154 feather edges sanding adds realism article Canadas MAAC magazine Dick Phillips stated spent something like $20 building air frame eight-foot plane cost him $40 cover shocked cost airframe used consideration covering comparative incidental calculated cost covering airplane size using known cover ing materials rebellious price asked yard flimsy covering ma terial unbelievable thought over covering material problemapplicationwise weight-wise cost-wise-and answer nylon purchased few yards textile store covered airplane nylon brought covering price sensible level easy work doped well framework filling coats clear dope cut 50-50 usual amount talcum powder added best method apply first coats sponge mean cutting off 6 X 4 piece sponge rub ber dipping dope draw ing across covering material fills quickly evenly However nylon some defects small areas about inch square defy dope fill ing Another its tendency sag little damp weather although returns normal drier air present discovered world polyesters material mostly used lining drapes coats jackets etc 65 yard 48 wide cheaper nylon difficulty ma terial applying framework dope tended spring up places what did work very well deed contact cement cut out covering apply contact cement outer perimeter wing fuselage section lay polyester Use Gel contact cement because other stuff can pretty stringy now can lift stretch polyester until have smooth taut covering Now go over cemented areas heat iron cure cement covering complete let stand 24 hours pass iron over surfaces wrinkles fold lines small creases will disappear Dont iron too soon might draw material cemented area cause sagging Another product usually found drug stores Scotch-brand hair-set tape produced 3M company item originally intended hold wifes curls place tape pinked along both edges 300 long /2 wide semi-sticky side aircraft around 1925 used pinking tape cover over rib stitch ing two lengths covering met such down fuselage sides Around wing perimeter scale-like helps hide unevenness covering trimmed real spoked wheels generally covered Pass hot iron over tape insure canvas sometimes aluminum discs firm bond decided practical approach problem suitable wheels result method size large enough suit scale type could produced fulfilling above acceptably light functionally strong requisites approached problem too drawing must made proangles list smaller scale 2 in- posed wheel elevation to-the-ft WWI airplanes fabricated showing both sides wheel lookpassable spoked wheels method ing its edgethat includes tire rim appeared Dave Platts Scale sides hub method re Hand RCM August 69 However Continued page 92 August1977 11 Above The Quadra mounted authors giant aircraft Props 16- 17- 18-in diameter 6-in pitch available manufacturer IR Shettler Ent Below Aerotec used author 9 ft 3-in Porterfield converted glow ignition rated about 2-1/2 hp Tank used isa 20-os plastic bottle assistant allowed hold air plane Most Loops After airplane air borne trimmed out pilot indicates ready attempts loops can 30 seconds Usu ally about 11 loops wins Bomb Drop Five-ounce Dixie cups mounted fuselage top near wing root rubberbands Bombs prepared putting flour small square tissue holding top together small piece tape Bombs released cup pulling up airplane giving blip down elevator can give contestants added incentive hav ing contest director stand middle target Team Race Four-man teams drawn randomly attention frequency con flicts four airplanes placed starting line signal watch started first team member starts engine takes off flies around pylon about 200 yards away flies back over starting line time next man signaled same thing Time stops last mans airplane passes over starting line Team members help other get started coordinate land ings behind starting line about some ideas Ron Van Putte 12 Connie Dr Shallmar FL 32579 Thinking Big/Crawford continued page 11 quires two slabs wood least er circumference wheel least 1 thick Chuck faceplate wood lathe mark out tire rim section hub can turn shape required wood forming side wheel finished should have plugs cor responding outside shapes re quired wheel some wheel types both sides iden tical therefore plug would required Sand wax polish plugs lay up sufficient fiberglass resin depending type size form wheel sides set up re move lay up second Now trim excess glass tire rim sand down edges Drill axle holes put two halves together measure exact distance between both faces holes located small sliver wood through hole touching opposite face will give correct distance allowing fiberglass thickness true wheel turns depends upon accuracy lining up axle have used broomstick cut fit between holes hub turn drilled brass tube shaft inserted Allow brass tube project both sides wheel have hub place resin well two rim edges will now come together resined wrapped couple times fiberglass tape resin set up cut off protruding brass tube about /8 clear wheel hub Make several saw cuts across ends protruding tubes tap down segments around hub perimeter whole wheel can now sanded smooth length dowel through axle hole will help point tires cut rubber tubing circular sponge rubber used industry expansion joints Measure cut tire carefully tight fit cement two ends together cyanoacrylate tires mounted drop glue around perimeter tire rim will insure close relationship airplanes using cables con trols superb substitute dial cord sold radio accessory outlets method use install cables make up two small wooden blocks drilled halfway epoxied side fuselage bearings Between length brass tube generally 3/16 carries bellcrank fit tube blocks before epoxy bellcrank vertical line center fore-and-aft line fuse lage tubing provided arm side turn carries con necting arm servo allows elevator cables run down center fuselage servo mounted side also allows rudder servo mounted centerline have found helpful put little ten sion elevator crank assist servo pulling elevator up di rection rubberband will suffice make sure does overload servo Baby Ace 9 feet rib built up 1/8 sq spruce cableoperated aileronsas did full-size machinethat ran through small pulley wheels duplicated plane full-size plans including aluminum wing tips aluminum-sheeted leading edge large 92 Model Aviation belicrank installed near wing root cables led through pulley wheels aileron horns cable will remain taut wing halves disassembled fuselage servo connecting arm led end bellcrank out through root rib have used plastic tube bent right angles epoxied braces lieu pulley wheels course simpler Both methods work equally well commercially available fuel tanks suitable using larger en gines such Aerotec Quadra sources plastic bottles suitable needs Tanks edsily made up especially stick-a-tube method used Aerotec engine used 20-oz plastic bottle Quadra runs gasoline made up metal tank works very well could conceivably reduce possibility fire event serious crash Propellers fairly easy carve cluding laminated provided proposed prop laid out properly blank cut accurately close attention paid washout good sanding disc mounted headstock will easily shaping However owing availability good large props fair price hardly worth carve own except satisfy creational desires Whether bought home-made propellers should well balanced before use nearly cases hinges used flying surfaces miniature copies particular airplane being built Some surprisingly simple Others take little work form draw attention airplane field believe serious approach successful construction large miniature airplane must develop technique whereby concentrate total effort sound constructional meth ods applying whatever part project required manufac ture wheel hinge prop machine gun instruments coverings building techniques thorough investigation various construction possibilities should undertaken Effort direct ed manufacture item just complete program SOURCES Du-Bro Products Incorporated wauconda IL 60084 R Shettler Ent Pottery Road RR 3 Vernon BC Canada Kolbo Korp 230 N Crescent way Unit H Anaheim CA 9280 ja Homers Sales Dixie Highway Beecher IL 60401 Aerotec Model Engineering Co. Box 116 Lincolndale NY 10540 Btice Machine Specialties 8229 Compton Blvd. Paramount CA 90723 Midwest Industries Inc Ida Grove IA 51445 Hobby Shack 18480 Bandilier Circle Fountain valley CA 92708 world Engines 8960 Rossash Ave Cincinnati OH 45236 Model Rectifier Corporation 2500 woodhridge Avenue Edison NJ 08817 Fox Manufacturing Company 5305 Towson Ft Smith AR 72901 Also line propellers Cloudster/Shipp continued page 48 side Cloudster does appear sailplane Rather has lines 2-place Formula racer such animal made Perhaps reason test pilot Ray Cote owner pilot famous Shoestring racer comfortable Cloudster ever got involved soaring craft being built, thoroughly enjoys work test pilot often flying longer required just sheer fun Viewing craft underneath flies overhead reveals long tapered wing takes clean lines efficient sailplane type design landing gear received much consideration Most European motor gliders have single re tractable wheel fuselage sup porting outrigger wheels dangling wings requires pilot learn new ground handling techniques Ryan happy about Also taxiing low wing tips must carefully watched prevent hitting obstructions such boundary lights Ryson engi neers considered types landing gearssingle wheel bicycle arrangeAugust 1977 93 PROP DRIVE UNITi THIS SMOOTH RUNNING BELT DRIVEN UNIT OPENS UP WHOLE NEW DIMENSION IN 2 SCALE SPORT AND SCALE MODELS Now can build big have scale size working prop too Designed accept 60 size engine t unit will easily power airplanes weighing 20 lbs Now big old-timers extra large cowls arent impos sible anymore MAKES YOUR BIG AIRPLANE LOOK AND SOUND MORE REALISTIC @2022 AND 24 WOOD PROPS ARE AVAILABLE AT YOUR DEALER OR DIRECTLY FROM GRISH BROS OSLOW POWERFUL FLIGHT IS ACHIEVED WITH THIS UNIT MAKING THOSE OLD TIME AIRCRAFT EXPECIALLY REALISTIC 0 RPMS RANGING FROM 600 TO 5000 DEPENDING ON ENGINE AND PROP COMB 0 THIS UNIT COMES COMPLETELY ASSEMBLED READY FOR ENGINE INSTALLATION CAT NO 210 unit being used Dave Grayu u eruuoaro sport plane 0 S Max Goidhead engine 22-9 prop $10000 DU-BRO PRODUCTS INCORPORATED 480 Bonner Road Wauconda Illinois 60084 USA