CORRUGATIONS The Boeing biplanes 1928-32 era along numerous other aircraft attractive model subjects modeler has rejected graceful jaunty aircraft Scale projects because corrugated metal ailerons tail surfaces rounded corruga tions spaced 2-in centers too diffi cult reproduce large quantities Adding dilemma corrugations began ended flat material extending control surface edges Omission corrugations resulted model serious loss character Murrell E Wald informs us tooling method used build true-scale Boeing P-12 /8 size control surfaces made 005in lithoplate aluminum 005-in plate used small printing presses printing dustry differs 010-015-in olate Fj T 7 MOUNT ING BRACKETS NO 10-32 /THREADED RODS ASTEEL PLATES SPACED WITH WASHERS Fl II II WOOD HANDLE HEMISPHERICAL TIP ON FORMING TOOL RADIUS TO PROVIDE PROPER DEPTH OF CORRUGATION 005 THICKNESS OF ALUMINUM LITHOPLATE PLYWOOD SURROUNDS GRID FOR LEVEL WORKING SURFACE AE PLYWOOD BASE Bob Dolly describe Murrell E Walds method forming corrugations aluminum litho plate month simple tool/jig secret Forming tool can length music wire used printing large newspaper-size sheets find source 005-in plates look small local printing establishment litho plate used just once has scrap value Any printers ink remains sur face easily removed through application common solvent such lacquer thinner Murrells method consists stacking series steel plates accurately cut size interspersed spacers between pair plates form grid aluminum sheet held firmly position over grid de pressed spaces between grid plates hand-held forming tool Grid plates made low-carbon steel held alignment means pair threaded rods passing through accurately drilled holes plates rods should about 187-in dia meter Rods 10-32 thread standard hard ware store items come 1- 3-ft lengths spacers can No 10 washers used singly multiple combination grid plates 1929 Travel Air Mystery Ship Golden Age Models kit built Bob Schultheis L seen Winnebago RC Fliers All-Scale Fly-In held Oshkosh WI Power Webra 90 FInish Pactra Formula U over Silkspun Coverite Ralph Becks Curtiss JN-4D Jenny R prototype Proctor kit %-scale An 05 90 four-stroke powers 10-lb model Seen Broadhead WI Scale Rally 42 Model Aviation Radio Control Scale Bob Dolly Wischer S-221 Lapham Peak Rd Delafield Wi 53018 Jim Kummerows -scale Pober Pixie L built RCM plans uses Quadra 50 power Weight 24 lb finish Sig Koverall butyrate dope Seen Broadhead WI Scale Rally Don Wolks -scale EAA Biplane R originated Balsa USA kit Engine OS 90 fourstroke Plane spans 60 weighs 10 lb Unusual finish Rustoleum paint over Solartex washer thickness determines corrugation size spacing agree models scale completed grid mounted plywood base wood screws fastened through end brackets shown sketch surround ing area built up plywood flush top surface grid sanding neces sary assure flat top Murrell suggests hand-held forming tool made very hard steel preferably equipped wooden handle such used file firm pressure can applied form corrugation welts typical example 093- 125-in music wire end ground hemisphereor tool can made discarded scriber tool used stretch aluminum plate downward between grid plates multiple strokes necessary pro duce corrugations desired depth length particular application Murrell also suggests lithoplate held down along edges tape prevent its creeping away being formed Pencil guide lines drawn top plywood surface aid alignment first thought would appear enough grid plates stacked accommodate full aileron length example However larger number arent really needed small re cess made plywood adjacent grid provide space corrugations already made end lithoplate Begin making corrugations grid will allow remove hold-down tape shift aluminum right left completed corrugations fit recess plywood Tape plate down again last corrugation made pressed space tween first pair grid plates continue pressing additional corrugations can go indefinitely until full aileron length has made corrugations will automatically equally spaced long piece corrugated aluminum can made way few plates part carefully realigned after repositioning short practice session use handheld tool probably necessary produce smooth accurate scale welt aluminum Murrell assures Scale modelers endowed moderate talents can master con firmed technique method reproduction end result proved re warding 50 years modeling Samples sent best quality would en hance appearance Scale project ease handling would helpful make corrugations center large sheet cutting away excess aluminum material around edges afterward obtain final shape corrugations constantly chang ing length some layout work needed di rectly aluminum before work begins Continued page 154 IMPORTANT PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoy ment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacturers recommen dations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protec tion operating model engines permit objects touch turn ing propeller 7 To stop engine cut off fuel supply accordance manufacturers instructions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury ALWAYS FOLWW SAFETY PRECAUTIONS WINDSOR PROPELLER CO SANTA ROSA CALIF Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 oz $20001/4 scale 4 oz $2800 1/5 scale 3 az $24001/3 scale 9 oz $3200 Plus $500 postage packing Airmail z fast delivery send phone Visa orMastercharpe number FOURMOST PRODUCTS Innovative Model Products * Recoil Tubing * Fuel Fitting Sets 2 Sizes * Cockpit Coaming 4 sizes * 049/051 Airflo Engine Mount * 40 Airflo Engine Mount * Gapless Hinge 3 sizes * Gapless Hinge Slotter * Redi-Hinge 2 Sizes * Retractable Tow Hook * Bulkhead Fittings * Window Flange 3 sizes * Miter Master * Fuel Shutoff * Fuel Manifold * Fourmost Fillet 3 sizes * Flush Button * Bomb Release Fourmost Products has serving modeling public over 12 years continue develop innovative produots fill modeling needs information about unique tools accessories talk local hobby dealer send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 February 1989 43 Drawings EAA magazine used John Bishop build -scale 13-lb Corben Super Ace Engine 05 120 tourstroke An automatic trapdoor engine cooling effective special feature An other fine model Broadhead Rally AH DESIGNS 79 Pen-y-Maes Ave Rhyl Clwyd LL18 4ED UK Tel 745-53987 New Rocket Uses B C andO Engines5. Capability No Else Offers MRCs recent introduction 25 Moonbiaster inter mediate kit brings yet another technological advance MRCs Computer Aided Designs CAD built carry B4-2 06-3 engines However Moonblaster also commercially sold rocket kit includes easy-touse adapter also allows use powerful Dengines Bulitto take blast Moonblaster features large die-cut balsa fins blowmolded nose cone superb space capsule detailing Self stick decals 18chute Send free catalog See full line advanced MRC rockets hobby dealer cant help call us directly MRCG Model Rectifier Corporation 2500 Woodbridge Ave Edison NJ 08817 201 985-7800 coming mail has low think reason twofold First time between sues ie between Nats November issue no columns December issue normal col umns Also major parts country its fall pre-winter So outa-sight outa mind effect seeing column month combined season speculate lowers reader interest past weeksince December issue hit streetsthe mail back love Reflecting season issue will no doubt hands just about holiday time timely opportunity wish happy safe memorable holiday Andfor coming yearplease have noth ing happy safe quiet Electric landings Thank everyone giving opportu nity afforded column share fun Please forward comment question SASE please want reply author address given very top column RC AerobaticsNan Putte Continued page 41 elementary school librarian last item Henry Ham 251 Calle Canon de Faber Green Valley AZ 85614 wrote need help can test data Clark Y airfoil Reynolds numbers greater 87000 ob tamed has found data Reynolds num ber source 10-in chord Reyn olds number 87000 corresponds 12 mph Data 300000 would better can remember some old NACA reports Twenties Thirties covered wind tunnel tests Clark Y cant remember Reynolds number source anymore anyone can help Henry please write him Editors note sent copy Ron s column comments new Carl Goldberg Models kits manufacturer company could aware good not-so-good things said about mew models provide opportunity comment Noted flier Dave Patrick responded behalf com pany following being substance views Vector model has flown extensively K&B Sportster 45 OS 3SFP both using muffler pressure pressurize fitel tank recommended instruction booklet out fidel feed problem Dave recommended moving servo end steering pushrod hale closer servo shaft servo output arm/disc steering found too sensitive rather replace kits nose wheel steering arm longer unit Eagle 2 Dave expressed surprise kind balsa sample kit far off desired grade believes Carl Goldberg Models has quality controls among best indus try Concerning power plant feels strongly sport 40 engine racing engine too much airplane especially take offs made grass surface RMcM RC Scale/Wischers Continued page 43 few pencil lines will suffice Anyone thinking about flying all-metal Ford Trimotor Brace wires Streamlined wires flight surfac es Scale models have simulated vari ous meansor sometimes entirely eliminated Some modelers have gone great lengths make wires true miniature renditions actual shape rolled wires full-sized aircraft quite complete machine shop con junction expert machinists know-how becomes necessity anyone taking route best have seen made Merritt Zim merman pair hardened rollers having semielliptical shape peripheries equipped handcrank squeeze wire round stock streamlined shape Its tricky process expert because wire stretches being rolled its initial length must somewhat less fin ished product past have described own process using three parallel music wire lengths sol dered together filed sanded streamlined shape look great suffi ciently stiff prevent sagging small tension spring used end latest method manufacture called attention John Bishop visited bike shop found stainless steel bicycle spokes Racing cyclists use reduce drag rap idly revolving wheel come limited range lengths problem being sizes closely grouped around 12 fit stan dard racing wheels small variations length due fact some wheels laced spoke crossing three four other spokes also accommodate variations hub diameters full length spoke isnt flattened streamlined shape useful small aircraft brace wires tail surfaces advantages bike spoke end threaded 2-56a very common size Most Scale modelers have nuts threading taps #11 BIadesE~ 1i 40 Pad $485 Dehvered 100 Pad $895 Berkeley Trading CoCAEMO PO Box 26 Berkeley Springs WV 254112J Send 55on nor complete line 154 Model Aviation WORmS orocest SCALE E,oro seRVICE 800 000 RACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING 5ASE Enlarging Wt Jin Pepinon Catalog *OOSCALE PLANS ad PHOTO SEH VICE 3209 Madoon Geennbno NC 27403 psoe i1519l2925239 No cnIlocrl sioo BIIE5UDP EL IlL RIDOE iaIog MACHINERY TOOL 8 P0 Box 536-V omoog icane wv 25526 off Er 304-562-3538 complete selecnion lathes mills nools Aviation Modeler suit first inclination solder two spokes end-to-end greater length Anyone has attempted soldering 18-8 stainless steel past will recognize futility situa tion Simply stated cant done Ordinary sol der simply rolls off molten puddles tried high-temperature brazing nickel-silver alloy rod instant success made strong joint spoke cut 450 angle crease wetted area joint Excess braz ing alloy removed bench grinder joint dressed fine file sandpa per Silver solder works equally well expensive bike spokes available two usable shapes oval closely simulates desir able streamlined shape bladed flat shape rounded edges Oval spokes have body width 079 thickness 053 Bladed spokes have body 104 wide 039 thick Stainless spokes cheap ing priced about 27 oval 54C bladed price includes threaded nipple could used tightening wire sembly curved upset end spoke could used anchor end wire spoke nipple has slotted end screwdriver tensioning wire also provided flats wrench Stainless steel spokes perfectly straight such have come expect lengths music wire can flexed fairly straight line finger pressure course bike wheel spokes straighten easily because high tension used installed methods producing streamlined wires models really simulations provide illusion authenticity reality wires full-size airplane quite sharp edges feature extremely difficult re produce model addition large airplanes particular may HI TECH GLASS EPPLER 214 * 134 WINGSI TOTAL ENERGY SPAR ASSEMBUES airplane NI PERFORMANCE SAIIPLANES offers high quality line epoxies glass cloth laminates HP Cell wing sheeting skin fuselages wings Brochure send SASE Sample kit $800 HI PERFORMANCE SAILPLANES 1206 487-1721 17902 NE 156th 50 Woodinville WA 98072 10 FT B-17 PLANS $3500 3 CATALOGS $900 THE BE5T IN SCALE gag HOLMAN PO BOX 741 SAN BERNARDINO CA 92402 JET ENGINES DOYLEJE~ 195w log $500 letter $1200/year DOYLEJET 4015 San Jacinto#404G Houston TX 77004713 440-4744 have several different sizes wires depending used example loadbearing flying wires large biplane would 625 wide landing wires sup port wings ground 50 wide Brace wires tail surfaces dinarily smalleras little 375 streamlinedor may round wire 187-in diameter Scale modeler really concerned about accuracy authenticity model would need have access prototype measurements Photos three-view drawings provide enough detail satisfaction getting right rewards associated creation high-quality Scale model other hand dont look ac claim anyone another diehard Scale real 1st average observer wont know differ ence includes judges contest Fillets frustrations finish applica tion painted Scale model propensity finish pull away fillet forming void between paint fillet surface leaves angular fillet constantly varying di mensions place desirable smooth semicircular shape An otherwise finely finished model thereby flawed completely ruined problem has occurred some com mercial fillet materials including ad vertise immunity disease Brushed-finish coats less likely have problem sprayed coats extra thinner required paint cause spray properly seems have effect dreaded change shape transpires thinner penetrates fillet material softened have removed fillets after such change shape have found mate rial soft rubbery though hard earlier stage cure create barrier against penetration thinner giving fillet coat clear epoxy before final finishing schedule begun can either brushed sprayed use brush means edges brushed area need light sanding remove edge buildup epoxy small task No 180 silicon carbide paper may other masking techniques work equally well barrier however clear epoxy items stocked shelves down workshop Data source know very few Scale modelers have complete data bank reference documentation information us times will need help finding three-view drawing photos model construction drawings brought attention because almost mail readers consists requests docu mentation data Dr Lyle F Pepino has recognized need information now offers 66-page catalog listing model-building plans photo packs draw ing research service three-view drawings well plan-enlargement -reduction facil ity address Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 telephone 919 292-5239 latest catalog $4 $6 overseas catalog now includes plan min iatures reductions model con struction drawings give prospective cus tomer some idea what can expected along plan reviews Aviation videos VHS mat also listed Errata In September 1988 column Continued page 158 THE LEADER IN COMPETITION NEW SERIES 100 DIAPRICE 16 NEW p K NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCH PRICE 534 634 72833456 633/4s68 84566/7 94566/77 104566 106W8W 10BEW Ii4677776 115W 116EW 1167 124W 125W 1256 1356 14s6 1566 164N 16676 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I 6776 SERIES 400C 666I777 9777/ W WIDE BLADE EW EXTRA WIDE N NARROW February 1989 155 PROPELLERS TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 8 6778 67 676 PRO SERIES 3 Large Scale Miniature Aircraft Design end Drawings Herb Hell IMAA 1486 1 1/S5caieAewncaC3gtwino2700/pp 21/6 Scale SBC-3 Heildice 89 wing Sipe3000/pp 32-t/lt 0ca1e5505Dant/es-53wins3000/pp 41/S Scale AD3 09 Dogiw Skyraide3000/pp 9 High Wing Seginnor Dee Plane20OO/pp send 200 conpists catalog tw DP SysOems Inc. 1842 Tettenball Hoasnan TX 77806 /713/ 99948401713/ 8940868 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize TT-150-B 12 11-175-B .. 1-3/4 11-200-B TI-225-B .. 2-1/4 TI-226-B .. 2-114 FAll . TI-250-B .. 2-1/2 TT-251-B 112 FAll .. TT-275-B /4 TT-276-B /4 FAt 00-B 1T-301-BFAI 11-325-B .. 3-1/4 11-350-B .. 3-1/2 11-375-B . 4 11-400-B Retait Approx Price Weight $1395 058 oz 1495 095 oz 1595 100 02 169516002 1895150oz 189519002 2095170oz 2295220oz 2495200oz 269526002 2895250oz 369534002 499547002 5995520oz 6995570oz 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS Pan NoSize 11-140-A .. 1/4-28 TT-147-A .. 1/4-28/7mm . TT-610-A 10mm TT-710-A .. lx 10mm TT-516-A .. 5/16-24 TT-518-A .. 5/16-24/8mm TT-810-A x 10mm .. TT-825-A .8 x 125mm TT-375-A3/8-24 TI-125-A . lOx 125mm Reixil Approx Price Weighi $495 061 oz 495 061 02 495 . 02 495 .. 082 02 495 . 076 02 495 076 02 495 076 02 495 02 595 02 595 llSoz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 RC Scale/Wischers Continued page 155 photo twin-engined modet credited Hat Parenti Piper Comanche aircraft ac tually Beechcraft Baron worse dont know name builder Baron things happen tate night make photo prints dining tabte entarge wrong negative apotogies Hat December t988 cotumn photo cap tion ctaimed engine Bud Atkinsons Hawker Hurricane Genoah G-38 Obvi ousty shoutd have read Zenoah G-38 Finis As readers may have surmised due absence some recent issues MA cotumn marks end efforts authors RC Scate section atso marks second retirement first having 11 years ago Bob departed regutar emptoyment atways desire real freedom could never materiatize because pressing need meet MAs monthty deadtines facing typewriter btank piece paper wondering fill something new have atways resisted taking easy way out such fitting space product reviewsuntess product specificalty tended Scale models greatest part cotumn material originated own experi ences wett ideas gleaned conversations contests ralties 1988 Bob flew onty two contests first portions months cotumn contributed readers such contributions have rare Otis hoped reptacement writer whoever may wiOt have greater success obtaining materiat other Scale modelers efforts writing cotumn aided desire repay some pteasure gained modeling experience Writing has ted ac quiring new friends suc cinctly expressed assessment situation Everything everyone has lifespan RC Soaring/Blakeslee Continued page 45 both Sailplane Power types worldclass slope Fly want want frequencies permitting course As Wit says No judging no rules no hasslesonly fly ing looking swapping talking Flying wilt pre-registration clos es April 29 fee $30 includes en try fabulous raffle Saturday eve ning banquet Additional models $5 ad ditional dinners $18 Out-of-towners get good deal special rate Clover Island Inn $30 single $35 double room Call 800 833-1800 reservations banquet will held evening will also include slide presentation guest speaker Get entry check frequency fre quencies off now Wil Byers 632 Meadows Drive East Richiand WA 99352 Send Wil SASE youd like information en try form phone number 509 627-5224 Nordic Championships year Soar ing pilots Denmark Sweden Norway Fin land sometimes Iceland get together Nordic Championships use F3B rules rotate contest among four countries 1988 held Norway friend Preben Norholm lives Copenhagen sent pic tures interesting description what hap pened part Prebens letter green bird Grover designed flown Joakim Stahl Sweden Nor dic Champion 1986 87 won again year Joakim perfect F3B pilot cool aggressive always witting take calcu lated strategic risks white plane called Safir 2 de signed flown Karsten Jeppesen Den mark Karsten Nordic Champion 1985 runner-up year leading game un til last round lost due inferior judg ments Primary Strategic Distance Task Helper did lead him good thermal last Distance flight judged lift weaker actually consequently told him initiate speeding up too late fourminute slot make matters worse up against Stahi Karsten weather 24 legs lost 22 Stahls 23 told after wards spectacular slot con test didnt noticetoo busy wonder what language use Nor dic Championships Its very simplewe speak English Well least Finns listen ing Ocelandics dont speak Danish addition native language Danish Norwegian Swedish still closely re lated understand other talk slowly clearly Viking age spoke original Nordic language atmost identical Icelandic today nobody else understands now Since have influenced German English Dutch Also Danish especially influenced French during 17th 18th centuries So lucky everyone understands English nowa days 88 F3B Nordics took place fullscale gliding center Elverum some 100 miles north Oslo close Swedish border way Norwegian-Swedish border may easiest cross world First meet blue sign saying Border 1 km Shortly before reaching border 50 km 30 mph speed limit sign red sign saying Goods DeclareTurn Right Theres also green Nothing DeclareKeep Straight Fi nally theres sign canceling speed reduction youre Sweden Thats world should Eastern Iowa LSF Regional contest Terry Ed monds co-CD regional sent photo fliers has say about twoday contest would have thought hurricane could af fect Sailplane contest Iowa reality rem158 Model Aviation coior ia-views 50000 picures vi siucs S Ifl Stock MILS METOLS BOOKS 4LiTRES COIPETE CT0L0G $200 PREOTSION INSIRJiIENTS C4AfPIESL TULS ce 2100 8 S1 Ro
Edition: Model Aviation - 1989/02
Page Numbers: 42, 43, 154, 155, 158
CORRUGATIONS The Boeing biplanes 1928-32 era along numerous other aircraft attractive model subjects modeler has rejected graceful jaunty aircraft Scale projects because corrugated metal ailerons tail surfaces rounded corruga tions spaced 2-in centers too diffi cult reproduce large quantities Adding dilemma corrugations began ended flat material extending control surface edges Omission corrugations resulted model serious loss character Murrell E Wald informs us tooling method used build true-scale Boeing P-12 /8 size control surfaces made 005in lithoplate aluminum 005-in plate used small printing presses printing dustry differs 010-015-in olate Fj T 7 MOUNT ING BRACKETS NO 10-32 /THREADED RODS ASTEEL PLATES SPACED WITH WASHERS Fl II II WOOD HANDLE HEMISPHERICAL TIP ON FORMING TOOL RADIUS TO PROVIDE PROPER DEPTH OF CORRUGATION 005 THICKNESS OF ALUMINUM LITHOPLATE PLYWOOD SURROUNDS GRID FOR LEVEL WORKING SURFACE AE PLYWOOD BASE Bob Dolly describe Murrell E Walds method forming corrugations aluminum litho plate month simple tool/jig secret Forming tool can length music wire used printing large newspaper-size sheets find source 005-in plates look small local printing establishment litho plate used just once has scrap value Any printers ink remains sur face easily removed through application common solvent such lacquer thinner Murrells method consists stacking series steel plates accurately cut size interspersed spacers between pair plates form grid aluminum sheet held firmly position over grid de pressed spaces between grid plates hand-held forming tool Grid plates made low-carbon steel held alignment means pair threaded rods passing through accurately drilled holes plates rods should about 187-in dia meter Rods 10-32 thread standard hard ware store items come 1- 3-ft lengths spacers can No 10 washers used singly multiple combination grid plates 1929 Travel Air Mystery Ship Golden Age Models kit built Bob Schultheis L seen Winnebago RC Fliers All-Scale Fly-In held Oshkosh WI Power Webra 90 FInish Pactra Formula U over Silkspun Coverite Ralph Becks Curtiss JN-4D Jenny R prototype Proctor kit %-scale An 05 90 four-stroke powers 10-lb model Seen Broadhead WI Scale Rally 42 Model Aviation Radio Control Scale Bob Dolly Wischer S-221 Lapham Peak Rd Delafield Wi 53018 Jim Kummerows -scale Pober Pixie L built RCM plans uses Quadra 50 power Weight 24 lb finish Sig Koverall butyrate dope Seen Broadhead WI Scale Rally Don Wolks -scale EAA Biplane R originated Balsa USA kit Engine OS 90 fourstroke Plane spans 60 weighs 10 lb Unusual finish Rustoleum paint over Solartex washer thickness determines corrugation size spacing agree models scale completed grid mounted plywood base wood screws fastened through end brackets shown sketch surround ing area built up plywood flush top surface grid sanding neces sary assure flat top Murrell suggests hand-held forming tool made very hard steel preferably equipped wooden handle such used file firm pressure can applied form corrugation welts typical example 093- 125-in music wire end ground hemisphereor tool can made discarded scriber tool used stretch aluminum plate downward between grid plates multiple strokes necessary pro duce corrugations desired depth length particular application Murrell also suggests lithoplate held down along edges tape prevent its creeping away being formed Pencil guide lines drawn top plywood surface aid alignment first thought would appear enough grid plates stacked accommodate full aileron length example However larger number arent really needed small re cess made plywood adjacent grid provide space corrugations already made end lithoplate Begin making corrugations grid will allow remove hold-down tape shift aluminum right left completed corrugations fit recess plywood Tape plate down again last corrugation made pressed space tween first pair grid plates continue pressing additional corrugations can go indefinitely until full aileron length has made corrugations will automatically equally spaced long piece corrugated aluminum can made way few plates part carefully realigned after repositioning short practice session use handheld tool probably necessary produce smooth accurate scale welt aluminum Murrell assures Scale modelers endowed moderate talents can master con firmed technique method reproduction end result proved re warding 50 years modeling Samples sent best quality would en hance appearance Scale project ease handling would helpful make corrugations center large sheet cutting away excess aluminum material around edges afterward obtain final shape corrugations constantly chang ing length some layout work needed di rectly aluminum before work begins Continued page 154 IMPORTANT PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoy ment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacturers recommen dations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protec tion operating model engines permit objects touch turn ing propeller 7 To stop engine cut off fuel supply accordance manufacturers instructions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury ALWAYS FOLWW SAFETY PRECAUTIONS WINDSOR PROPELLER CO SANTA ROSA CALIF Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 oz $20001/4 scale 4 oz $2800 1/5 scale 3 az $24001/3 scale 9 oz $3200 Plus $500 postage packing Airmail z fast delivery send phone Visa orMastercharpe number FOURMOST PRODUCTS Innovative Model Products * Recoil Tubing * Fuel Fitting Sets 2 Sizes * Cockpit Coaming 4 sizes * 049/051 Airflo Engine Mount * 40 Airflo Engine Mount * Gapless Hinge 3 sizes * Gapless Hinge Slotter * Redi-Hinge 2 Sizes * Retractable Tow Hook * Bulkhead Fittings * Window Flange 3 sizes * Miter Master * Fuel Shutoff * Fuel Manifold * Fourmost Fillet 3 sizes * Flush Button * Bomb Release Fourmost Products has serving modeling public over 12 years continue develop innovative produots fill modeling needs information about unique tools accessories talk local hobby dealer send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 February 1989 43 Drawings EAA magazine used John Bishop build -scale 13-lb Corben Super Ace Engine 05 120 tourstroke An automatic trapdoor engine cooling effective special feature An other fine model Broadhead Rally AH DESIGNS 79 Pen-y-Maes Ave Rhyl Clwyd LL18 4ED UK Tel 745-53987 New Rocket Uses B C andO Engines5. Capability No Else Offers MRCs recent introduction 25 Moonbiaster inter mediate kit brings yet another technological advance MRCs Computer Aided Designs CAD built carry B4-2 06-3 engines However Moonblaster also commercially sold rocket kit includes easy-touse adapter also allows use powerful Dengines Bulitto take blast Moonblaster features large die-cut balsa fins blowmolded nose cone superb space capsule detailing Self stick decals 18chute Send free catalog See full line advanced MRC rockets hobby dealer cant help call us directly MRCG Model Rectifier Corporation 2500 Woodbridge Ave Edison NJ 08817 201 985-7800 coming mail has low think reason twofold First time between sues ie between Nats November issue no columns December issue normal col umns Also major parts country its fall pre-winter So outa-sight outa mind effect seeing column month combined season speculate lowers reader interest past weeksince December issue hit streetsthe mail back love Reflecting season issue will no doubt hands just about holiday time timely opportunity wish happy safe memorable holiday Andfor coming yearplease have noth ing happy safe quiet Electric landings Thank everyone giving opportu nity afforded column share fun Please forward comment question SASE please want reply author address given very top column RC AerobaticsNan Putte Continued page 41 elementary school librarian last item Henry Ham 251 Calle Canon de Faber Green Valley AZ 85614 wrote need help can test data Clark Y airfoil Reynolds numbers greater 87000 ob tamed has found data Reynolds num ber source 10-in chord Reyn olds number 87000 corresponds 12 mph Data 300000 would better can remember some old NACA reports Twenties Thirties covered wind tunnel tests Clark Y cant remember Reynolds number source anymore anyone can help Henry please write him Editors note sent copy Ron s column comments new Carl Goldberg Models kits manufacturer company could aware good not-so-good things said about mew models provide opportunity comment Noted flier Dave Patrick responded behalf com pany following being substance views Vector model has flown extensively K&B Sportster 45 OS 3SFP both using muffler pressure pressurize fitel tank recommended instruction booklet out fidel feed problem Dave recommended moving servo end steering pushrod hale closer servo shaft servo output arm/disc steering found too sensitive rather replace kits nose wheel steering arm longer unit Eagle 2 Dave expressed surprise kind balsa sample kit far off desired grade believes Carl Goldberg Models has quality controls among best indus try Concerning power plant feels strongly sport 40 engine racing engine too much airplane especially take offs made grass surface RMcM RC Scale/Wischers Continued page 43 few pencil lines will suffice Anyone thinking about flying all-metal Ford Trimotor Brace wires Streamlined wires flight surfac es Scale models have simulated vari ous meansor sometimes entirely eliminated Some modelers have gone great lengths make wires true miniature renditions actual shape rolled wires full-sized aircraft quite complete machine shop con junction expert machinists know-how becomes necessity anyone taking route best have seen made Merritt Zim merman pair hardened rollers having semielliptical shape peripheries equipped handcrank squeeze wire round stock streamlined shape Its tricky process expert because wire stretches being rolled its initial length must somewhat less fin ished product past have described own process using three parallel music wire lengths sol dered together filed sanded streamlined shape look great suffi ciently stiff prevent sagging small tension spring used end latest method manufacture called attention John Bishop visited bike shop found stainless steel bicycle spokes Racing cyclists use reduce drag rap idly revolving wheel come limited range lengths problem being sizes closely grouped around 12 fit stan dard racing wheels small variations length due fact some wheels laced spoke crossing three four other spokes also accommodate variations hub diameters full length spoke isnt flattened streamlined shape useful small aircraft brace wires tail surfaces advantages bike spoke end threaded 2-56a very common size Most Scale modelers have nuts threading taps #11 BIadesE~ 1i 40 Pad $485 Dehvered 100 Pad $895 Berkeley Trading CoCAEMO PO Box 26 Berkeley Springs WV 254112J Send 55on nor complete line 154 Model Aviation WORmS orocest SCALE E,oro seRVICE 800 000 RACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING 5ASE Enlarging Wt Jin Pepinon Catalog *OOSCALE PLANS ad PHOTO SEH VICE 3209 Madoon Geennbno NC 27403 psoe i1519l2925239 No cnIlocrl sioo BIIE5UDP EL IlL RIDOE iaIog MACHINERY TOOL 8 P0 Box 536-V omoog icane wv 25526 off Er 304-562-3538 complete selecnion lathes mills nools Aviation Modeler suit first inclination solder two spokes end-to-end greater length Anyone has attempted soldering 18-8 stainless steel past will recognize futility situa tion Simply stated cant done Ordinary sol der simply rolls off molten puddles tried high-temperature brazing nickel-silver alloy rod instant success made strong joint spoke cut 450 angle crease wetted area joint Excess braz ing alloy removed bench grinder joint dressed fine file sandpa per Silver solder works equally well expensive bike spokes available two usable shapes oval closely simulates desir able streamlined shape bladed flat shape rounded edges Oval spokes have body width 079 thickness 053 Bladed spokes have body 104 wide 039 thick Stainless spokes cheap ing priced about 27 oval 54C bladed price includes threaded nipple could used tightening wire sembly curved upset end spoke could used anchor end wire spoke nipple has slotted end screwdriver tensioning wire also provided flats wrench Stainless steel spokes perfectly straight such have come expect lengths music wire can flexed fairly straight line finger pressure course bike wheel spokes straighten easily because high tension used installed methods producing streamlined wires models really simulations provide illusion authenticity reality wires full-size airplane quite sharp edges feature extremely difficult re produce model addition large airplanes particular may HI TECH GLASS EPPLER 214 * 134 WINGSI TOTAL ENERGY SPAR ASSEMBUES airplane NI PERFORMANCE SAIIPLANES offers high quality line epoxies glass cloth laminates HP Cell wing sheeting skin fuselages wings Brochure send SASE Sample kit $800 HI PERFORMANCE SAILPLANES 1206 487-1721 17902 NE 156th 50 Woodinville WA 98072 10 FT B-17 PLANS $3500 3 CATALOGS $900 THE BE5T IN SCALE gag HOLMAN PO BOX 741 SAN BERNARDINO CA 92402 JET ENGINES DOYLEJE~ 195w log $500 letter $1200/year DOYLEJET 4015 San Jacinto#404G Houston TX 77004713 440-4744 have several different sizes wires depending used example loadbearing flying wires large biplane would 625 wide landing wires sup port wings ground 50 wide Brace wires tail surfaces dinarily smalleras little 375 streamlinedor may round wire 187-in diameter Scale modeler really concerned about accuracy authenticity model would need have access prototype measurements Photos three-view drawings provide enough detail satisfaction getting right rewards associated creation high-quality Scale model other hand dont look ac claim anyone another diehard Scale real 1st average observer wont know differ ence includes judges contest Fillets frustrations finish applica tion painted Scale model propensity finish pull away fillet forming void between paint fillet surface leaves angular fillet constantly varying di mensions place desirable smooth semicircular shape An otherwise finely finished model thereby flawed completely ruined problem has occurred some com mercial fillet materials including ad vertise immunity disease Brushed-finish coats less likely have problem sprayed coats extra thinner required paint cause spray properly seems have effect dreaded change shape transpires thinner penetrates fillet material softened have removed fillets after such change shape have found mate rial soft rubbery though hard earlier stage cure create barrier against penetration thinner giving fillet coat clear epoxy before final finishing schedule begun can either brushed sprayed use brush means edges brushed area need light sanding remove edge buildup epoxy small task No 180 silicon carbide paper may other masking techniques work equally well barrier however clear epoxy items stocked shelves down workshop Data source know very few Scale modelers have complete data bank reference documentation information us times will need help finding three-view drawing photos model construction drawings brought attention because almost mail readers consists requests docu mentation data Dr Lyle F Pepino has recognized need information now offers 66-page catalog listing model-building plans photo packs draw ing research service three-view drawings well plan-enlargement -reduction facil ity address Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 telephone 919 292-5239 latest catalog $4 $6 overseas catalog now includes plan min iatures reductions model con struction drawings give prospective cus tomer some idea what can expected along plan reviews Aviation videos VHS mat also listed Errata In September 1988 column Continued page 158 THE LEADER IN COMPETITION NEW SERIES 100 DIAPRICE 16 NEW p K NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCH PRICE 534 634 72833456 633/4s68 84566/7 94566/77 104566 106W8W 10BEW Ii4677776 115W 116EW 1167 124W 125W 1256 1356 14s6 1566 164N 16676 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I 6776 SERIES 400C 666I777 9777/ W WIDE BLADE EW EXTRA WIDE N NARROW February 1989 155 PROPELLERS TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 8 6778 67 676 PRO SERIES 3 Large Scale Miniature Aircraft Design end Drawings Herb Hell IMAA 1486 1 1/S5caieAewncaC3gtwino2700/pp 21/6 Scale SBC-3 Heildice 89 wing Sipe3000/pp 32-t/lt 0ca1e5505Dant/es-53wins3000/pp 41/S Scale AD3 09 Dogiw Skyraide3000/pp 9 High Wing Seginnor Dee Plane20OO/pp send 200 conpists catalog tw DP SysOems Inc. 1842 Tettenball Hoasnan TX 77806 /713/ 99948401713/ 8940868 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize TT-150-B 12 11-175-B .. 1-3/4 11-200-B TI-225-B .. 2-1/4 TI-226-B .. 2-114 FAll . TI-250-B .. 2-1/2 TT-251-B 112 FAll .. TT-275-B /4 TT-276-B /4 FAt 00-B 1T-301-BFAI 11-325-B .. 3-1/4 11-350-B .. 3-1/2 11-375-B . 4 11-400-B Retait Approx Price Weight $1395 058 oz 1495 095 oz 1595 100 02 169516002 1895150oz 189519002 2095170oz 2295220oz 2495200oz 269526002 2895250oz 369534002 499547002 5995520oz 6995570oz 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS Pan NoSize 11-140-A .. 1/4-28 TT-147-A .. 1/4-28/7mm . TT-610-A 10mm TT-710-A .. lx 10mm TT-516-A .. 5/16-24 TT-518-A .. 5/16-24/8mm TT-810-A x 10mm .. TT-825-A .8 x 125mm TT-375-A3/8-24 TI-125-A . lOx 125mm Reixil Approx Price Weighi $495 061 oz 495 061 02 495 . 02 495 .. 082 02 495 . 076 02 495 076 02 495 076 02 495 02 595 02 595 llSoz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 RC Scale/Wischers Continued page 155 photo twin-engined modet credited Hat Parenti Piper Comanche aircraft ac tually Beechcraft Baron worse dont know name builder Baron things happen tate night make photo prints dining tabte entarge wrong negative apotogies Hat December t988 cotumn photo cap tion ctaimed engine Bud Atkinsons Hawker Hurricane Genoah G-38 Obvi ousty shoutd have read Zenoah G-38 Finis As readers may have surmised due absence some recent issues MA cotumn marks end efforts authors RC Scate section atso marks second retirement first having 11 years ago Bob departed regutar emptoyment atways desire real freedom could never materiatize because pressing need meet MAs monthty deadtines facing typewriter btank piece paper wondering fill something new have atways resisted taking easy way out such fitting space product reviewsuntess product specificalty tended Scale models greatest part cotumn material originated own experi ences wett ideas gleaned conversations contests ralties 1988 Bob flew onty two contests first portions months cotumn contributed readers such contributions have rare Otis hoped reptacement writer whoever may wiOt have greater success obtaining materiat other Scale modelers efforts writing cotumn aided desire repay some pteasure gained modeling experience Writing has ted ac quiring new friends suc cinctly expressed assessment situation Everything everyone has lifespan RC Soaring/Blakeslee Continued page 45 both Sailplane Power types worldclass slope Fly want want frequencies permitting course As Wit says No judging no rules no hasslesonly fly ing looking swapping talking Flying wilt pre-registration clos es April 29 fee $30 includes en try fabulous raffle Saturday eve ning banquet Additional models $5 ad ditional dinners $18 Out-of-towners get good deal special rate Clover Island Inn $30 single $35 double room Call 800 833-1800 reservations banquet will held evening will also include slide presentation guest speaker Get entry check frequency fre quencies off now Wil Byers 632 Meadows Drive East Richiand WA 99352 Send Wil SASE youd like information en try form phone number 509 627-5224 Nordic Championships year Soar ing pilots Denmark Sweden Norway Fin land sometimes Iceland get together Nordic Championships use F3B rules rotate contest among four countries 1988 held Norway friend Preben Norholm lives Copenhagen sent pic tures interesting description what hap pened part Prebens letter green bird Grover designed flown Joakim Stahl Sweden Nor dic Champion 1986 87 won again year Joakim perfect F3B pilot cool aggressive always witting take calcu lated strategic risks white plane called Safir 2 de signed flown Karsten Jeppesen Den mark Karsten Nordic Champion 1985 runner-up year leading game un til last round lost due inferior judg ments Primary Strategic Distance Task Helper did lead him good thermal last Distance flight judged lift weaker actually consequently told him initiate speeding up too late fourminute slot make matters worse up against Stahi Karsten weather 24 legs lost 22 Stahls 23 told after wards spectacular slot con test didnt noticetoo busy wonder what language use Nor dic Championships Its very simplewe speak English Well least Finns listen ing Ocelandics dont speak Danish addition native language Danish Norwegian Swedish still closely re lated understand other talk slowly clearly Viking age spoke original Nordic language atmost identical Icelandic today nobody else understands now Since have influenced German English Dutch Also Danish especially influenced French during 17th 18th centuries So lucky everyone understands English nowa days 88 F3B Nordics took place fullscale gliding center Elverum some 100 miles north Oslo close Swedish border way Norwegian-Swedish border may easiest cross world First meet blue sign saying Border 1 km Shortly before reaching border 50 km 30 mph speed limit sign red sign saying Goods DeclareTurn Right Theres also green Nothing DeclareKeep Straight Fi nally theres sign canceling speed reduction youre Sweden Thats world should Eastern Iowa LSF Regional contest Terry Ed monds co-CD regional sent photo fliers has say about twoday contest would have thought hurricane could af fect Sailplane contest Iowa reality rem158 Model Aviation coior ia-views 50000 picures vi siucs S Ifl Stock MILS METOLS BOOKS 4LiTRES COIPETE CT0L0G $200 PREOTSION INSIRJiIENTS C4AfPIESL TULS ce 2100 8 S1 Ro
Edition: Model Aviation - 1989/02
Page Numbers: 42, 43, 154, 155, 158
CORRUGATIONS The Boeing biplanes 1928-32 era along numerous other aircraft attractive model subjects modeler has rejected graceful jaunty aircraft Scale projects because corrugated metal ailerons tail surfaces rounded corruga tions spaced 2-in centers too diffi cult reproduce large quantities Adding dilemma corrugations began ended flat material extending control surface edges Omission corrugations resulted model serious loss character Murrell E Wald informs us tooling method used build true-scale Boeing P-12 /8 size control surfaces made 005in lithoplate aluminum 005-in plate used small printing presses printing dustry differs 010-015-in olate Fj T 7 MOUNT ING BRACKETS NO 10-32 /THREADED RODS ASTEEL PLATES SPACED WITH WASHERS Fl II II WOOD HANDLE HEMISPHERICAL TIP ON FORMING TOOL RADIUS TO PROVIDE PROPER DEPTH OF CORRUGATION 005 THICKNESS OF ALUMINUM LITHOPLATE PLYWOOD SURROUNDS GRID FOR LEVEL WORKING SURFACE AE PLYWOOD BASE Bob Dolly describe Murrell E Walds method forming corrugations aluminum litho plate month simple tool/jig secret Forming tool can length music wire used printing large newspaper-size sheets find source 005-in plates look small local printing establishment litho plate used just once has scrap value Any printers ink remains sur face easily removed through application common solvent such lacquer thinner Murrells method consists stacking series steel plates accurately cut size interspersed spacers between pair plates form grid aluminum sheet held firmly position over grid de pressed spaces between grid plates hand-held forming tool Grid plates made low-carbon steel held alignment means pair threaded rods passing through accurately drilled holes plates rods should about 187-in dia meter Rods 10-32 thread standard hard ware store items come 1- 3-ft lengths spacers can No 10 washers used singly multiple combination grid plates 1929 Travel Air Mystery Ship Golden Age Models kit built Bob Schultheis L seen Winnebago RC Fliers All-Scale Fly-In held Oshkosh WI Power Webra 90 FInish Pactra Formula U over Silkspun Coverite Ralph Becks Curtiss JN-4D Jenny R prototype Proctor kit %-scale An 05 90 four-stroke powers 10-lb model Seen Broadhead WI Scale Rally 42 Model Aviation Radio Control Scale Bob Dolly Wischer S-221 Lapham Peak Rd Delafield Wi 53018 Jim Kummerows -scale Pober Pixie L built RCM plans uses Quadra 50 power Weight 24 lb finish Sig Koverall butyrate dope Seen Broadhead WI Scale Rally Don Wolks -scale EAA Biplane R originated Balsa USA kit Engine OS 90 fourstroke Plane spans 60 weighs 10 lb Unusual finish Rustoleum paint over Solartex washer thickness determines corrugation size spacing agree models scale completed grid mounted plywood base wood screws fastened through end brackets shown sketch surround ing area built up plywood flush top surface grid sanding neces sary assure flat top Murrell suggests hand-held forming tool made very hard steel preferably equipped wooden handle such used file firm pressure can applied form corrugation welts typical example 093- 125-in music wire end ground hemisphereor tool can made discarded scriber tool used stretch aluminum plate downward between grid plates multiple strokes necessary pro duce corrugations desired depth length particular application Murrell also suggests lithoplate held down along edges tape prevent its creeping away being formed Pencil guide lines drawn top plywood surface aid alignment first thought would appear enough grid plates stacked accommodate full aileron length example However larger number arent really needed small re cess made plywood adjacent grid provide space corrugations already made end lithoplate Begin making corrugations grid will allow remove hold-down tape shift aluminum right left completed corrugations fit recess plywood Tape plate down again last corrugation made pressed space tween first pair grid plates continue pressing additional corrugations can go indefinitely until full aileron length has made corrugations will automatically equally spaced long piece corrugated aluminum can made way few plates part carefully realigned after repositioning short practice session use handheld tool probably necessary produce smooth accurate scale welt aluminum Murrell assures Scale modelers endowed moderate talents can master con firmed technique method reproduction end result proved re warding 50 years modeling Samples sent best quality would en hance appearance Scale project ease handling would helpful make corrugations center large sheet cutting away excess aluminum material around edges afterward obtain final shape corrugations constantly chang ing length some layout work needed di rectly aluminum before work begins Continued page 154 IMPORTANT PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoy ment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacturers recommen dations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protec tion operating model engines permit objects touch turn ing propeller 7 To stop engine cut off fuel supply accordance manufacturers instructions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury ALWAYS FOLWW SAFETY PRECAUTIONS WINDSOR PROPELLER CO SANTA ROSA CALIF Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 oz $20001/4 scale 4 oz $2800 1/5 scale 3 az $24001/3 scale 9 oz $3200 Plus $500 postage packing Airmail z fast delivery send phone Visa orMastercharpe number FOURMOST PRODUCTS Innovative Model Products * Recoil Tubing * Fuel Fitting Sets 2 Sizes * Cockpit Coaming 4 sizes * 049/051 Airflo Engine Mount * 40 Airflo Engine Mount * Gapless Hinge 3 sizes * Gapless Hinge Slotter * Redi-Hinge 2 Sizes * Retractable Tow Hook * Bulkhead Fittings * Window Flange 3 sizes * Miter Master * Fuel Shutoff * Fuel Manifold * Fourmost Fillet 3 sizes * Flush Button * Bomb Release Fourmost Products has serving modeling public over 12 years continue develop innovative produots fill modeling needs information about unique tools accessories talk local hobby dealer send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 February 1989 43 Drawings EAA magazine used John Bishop build -scale 13-lb Corben Super Ace Engine 05 120 tourstroke An automatic trapdoor engine cooling effective special feature An other fine model Broadhead Rally AH DESIGNS 79 Pen-y-Maes Ave Rhyl Clwyd LL18 4ED UK Tel 745-53987 New Rocket Uses B C andO Engines5. Capability No Else Offers MRCs recent introduction 25 Moonbiaster inter mediate kit brings yet another technological advance MRCs Computer Aided Designs CAD built carry B4-2 06-3 engines However Moonblaster also commercially sold rocket kit includes easy-touse adapter also allows use powerful Dengines Bulitto take blast Moonblaster features large die-cut balsa fins blowmolded nose cone superb space capsule detailing Self stick decals 18chute Send free catalog See full line advanced MRC rockets hobby dealer cant help call us directly MRCG Model Rectifier Corporation 2500 Woodbridge Ave Edison NJ 08817 201 985-7800 coming mail has low think reason twofold First time between sues ie between Nats November issue no columns December issue normal col umns Also major parts country its fall pre-winter So outa-sight outa mind effect seeing column month combined season speculate lowers reader interest past weeksince December issue hit streetsthe mail back love Reflecting season issue will no doubt hands just about holiday time timely opportunity wish happy safe memorable holiday Andfor coming yearplease have noth ing happy safe quiet Electric landings Thank everyone giving opportu nity afforded column share fun Please forward comment question SASE please want reply author address given very top column RC AerobaticsNan Putte Continued page 41 elementary school librarian last item Henry Ham 251 Calle Canon de Faber Green Valley AZ 85614 wrote need help can test data Clark Y airfoil Reynolds numbers greater 87000 ob tamed has found data Reynolds num ber source 10-in chord Reyn olds number 87000 corresponds 12 mph Data 300000 would better can remember some old NACA reports Twenties Thirties covered wind tunnel tests Clark Y cant remember Reynolds number source anymore anyone can help Henry please write him Editors note sent copy Ron s column comments new Carl Goldberg Models kits manufacturer company could aware good not-so-good things said about mew models provide opportunity comment Noted flier Dave Patrick responded behalf com pany following being substance views Vector model has flown extensively K&B Sportster 45 OS 3SFP both using muffler pressure pressurize fitel tank recommended instruction booklet out fidel feed problem Dave recommended moving servo end steering pushrod hale closer servo shaft servo output arm/disc steering found too sensitive rather replace kits nose wheel steering arm longer unit Eagle 2 Dave expressed surprise kind balsa sample kit far off desired grade believes Carl Goldberg Models has quality controls among best indus try Concerning power plant feels strongly sport 40 engine racing engine too much airplane especially take offs made grass surface RMcM RC Scale/Wischers Continued page 43 few pencil lines will suffice Anyone thinking about flying all-metal Ford Trimotor Brace wires Streamlined wires flight surfac es Scale models have simulated vari ous meansor sometimes entirely eliminated Some modelers have gone great lengths make wires true miniature renditions actual shape rolled wires full-sized aircraft quite complete machine shop con junction expert machinists know-how becomes necessity anyone taking route best have seen made Merritt Zim merman pair hardened rollers having semielliptical shape peripheries equipped handcrank squeeze wire round stock streamlined shape Its tricky process expert because wire stretches being rolled its initial length must somewhat less fin ished product past have described own process using three parallel music wire lengths sol dered together filed sanded streamlined shape look great suffi ciently stiff prevent sagging small tension spring used end latest method manufacture called attention John Bishop visited bike shop found stainless steel bicycle spokes Racing cyclists use reduce drag rap idly revolving wheel come limited range lengths problem being sizes closely grouped around 12 fit stan dard racing wheels small variations length due fact some wheels laced spoke crossing three four other spokes also accommodate variations hub diameters full length spoke isnt flattened streamlined shape useful small aircraft brace wires tail surfaces advantages bike spoke end threaded 2-56a very common size Most Scale modelers have nuts threading taps #11 BIadesE~ 1i 40 Pad $485 Dehvered 100 Pad $895 Berkeley Trading CoCAEMO PO Box 26 Berkeley Springs WV 254112J Send 55on nor complete line 154 Model Aviation WORmS orocest SCALE E,oro seRVICE 800 000 RACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING 5ASE Enlarging Wt Jin Pepinon Catalog *OOSCALE PLANS ad PHOTO SEH VICE 3209 Madoon Geennbno NC 27403 psoe i1519l2925239 No cnIlocrl sioo BIIE5UDP EL IlL RIDOE iaIog MACHINERY TOOL 8 P0 Box 536-V omoog icane wv 25526 off Er 304-562-3538 complete selecnion lathes mills nools Aviation Modeler suit first inclination solder two spokes end-to-end greater length Anyone has attempted soldering 18-8 stainless steel past will recognize futility situa tion Simply stated cant done Ordinary sol der simply rolls off molten puddles tried high-temperature brazing nickel-silver alloy rod instant success made strong joint spoke cut 450 angle crease wetted area joint Excess braz ing alloy removed bench grinder joint dressed fine file sandpa per Silver solder works equally well expensive bike spokes available two usable shapes oval closely simulates desir able streamlined shape bladed flat shape rounded edges Oval spokes have body width 079 thickness 053 Bladed spokes have body 104 wide 039 thick Stainless spokes cheap ing priced about 27 oval 54C bladed price includes threaded nipple could used tightening wire sembly curved upset end spoke could used anchor end wire spoke nipple has slotted end screwdriver tensioning wire also provided flats wrench Stainless steel spokes perfectly straight such have come expect lengths music wire can flexed fairly straight line finger pressure course bike wheel spokes straighten easily because high tension used installed methods producing streamlined wires models really simulations provide illusion authenticity reality wires full-size airplane quite sharp edges feature extremely difficult re produce model addition large airplanes particular may HI TECH GLASS EPPLER 214 * 134 WINGSI TOTAL ENERGY SPAR ASSEMBUES airplane NI PERFORMANCE SAIIPLANES offers high quality line epoxies glass cloth laminates HP Cell wing sheeting skin fuselages wings Brochure send SASE Sample kit $800 HI PERFORMANCE SAILPLANES 1206 487-1721 17902 NE 156th 50 Woodinville WA 98072 10 FT B-17 PLANS $3500 3 CATALOGS $900 THE BE5T IN SCALE gag HOLMAN PO BOX 741 SAN BERNARDINO CA 92402 JET ENGINES DOYLEJE~ 195w log $500 letter $1200/year DOYLEJET 4015 San Jacinto#404G Houston TX 77004713 440-4744 have several different sizes wires depending used example loadbearing flying wires large biplane would 625 wide landing wires sup port wings ground 50 wide Brace wires tail surfaces dinarily smalleras little 375 streamlinedor may round wire 187-in diameter Scale modeler really concerned about accuracy authenticity model would need have access prototype measurements Photos three-view drawings provide enough detail satisfaction getting right rewards associated creation high-quality Scale model other hand dont look ac claim anyone another diehard Scale real 1st average observer wont know differ ence includes judges contest Fillets frustrations finish applica tion painted Scale model propensity finish pull away fillet forming void between paint fillet surface leaves angular fillet constantly varying di mensions place desirable smooth semicircular shape An otherwise finely finished model thereby flawed completely ruined problem has occurred some com mercial fillet materials including ad vertise immunity disease Brushed-finish coats less likely have problem sprayed coats extra thinner required paint cause spray properly seems have effect dreaded change shape transpires thinner penetrates fillet material softened have removed fillets after such change shape have found mate rial soft rubbery though hard earlier stage cure create barrier against penetration thinner giving fillet coat clear epoxy before final finishing schedule begun can either brushed sprayed use brush means edges brushed area need light sanding remove edge buildup epoxy small task No 180 silicon carbide paper may other masking techniques work equally well barrier however clear epoxy items stocked shelves down workshop Data source know very few Scale modelers have complete data bank reference documentation information us times will need help finding three-view drawing photos model construction drawings brought attention because almost mail readers consists requests docu mentation data Dr Lyle F Pepino has recognized need information now offers 66-page catalog listing model-building plans photo packs draw ing research service three-view drawings well plan-enlargement -reduction facil ity address Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 telephone 919 292-5239 latest catalog $4 $6 overseas catalog now includes plan min iatures reductions model con struction drawings give prospective cus tomer some idea what can expected along plan reviews Aviation videos VHS mat also listed Errata In September 1988 column Continued page 158 THE LEADER IN COMPETITION NEW SERIES 100 DIAPRICE 16 NEW p K NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCH PRICE 534 634 72833456 633/4s68 84566/7 94566/77 104566 106W8W 10BEW Ii4677776 115W 116EW 1167 124W 125W 1256 1356 14s6 1566 164N 16676 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I 6776 SERIES 400C 666I777 9777/ W WIDE BLADE EW EXTRA WIDE N NARROW February 1989 155 PROPELLERS TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 8 6778 67 676 PRO SERIES 3 Large Scale Miniature Aircraft Design end Drawings Herb Hell IMAA 1486 1 1/S5caieAewncaC3gtwino2700/pp 21/6 Scale SBC-3 Heildice 89 wing Sipe3000/pp 32-t/lt 0ca1e5505Dant/es-53wins3000/pp 41/S Scale AD3 09 Dogiw Skyraide3000/pp 9 High Wing Seginnor Dee Plane20OO/pp send 200 conpists catalog tw DP SysOems Inc. 1842 Tettenball Hoasnan TX 77806 /713/ 99948401713/ 8940868 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize TT-150-B 12 11-175-B .. 1-3/4 11-200-B TI-225-B .. 2-1/4 TI-226-B .. 2-114 FAll . TI-250-B .. 2-1/2 TT-251-B 112 FAll .. TT-275-B /4 TT-276-B /4 FAt 00-B 1T-301-BFAI 11-325-B .. 3-1/4 11-350-B .. 3-1/2 11-375-B . 4 11-400-B Retait Approx Price Weight $1395 058 oz 1495 095 oz 1595 100 02 169516002 1895150oz 189519002 2095170oz 2295220oz 2495200oz 269526002 2895250oz 369534002 499547002 5995520oz 6995570oz 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS Pan NoSize 11-140-A .. 1/4-28 TT-147-A .. 1/4-28/7mm . TT-610-A 10mm TT-710-A .. lx 10mm TT-516-A .. 5/16-24 TT-518-A .. 5/16-24/8mm TT-810-A x 10mm .. TT-825-A .8 x 125mm TT-375-A3/8-24 TI-125-A . lOx 125mm Reixil Approx Price Weighi $495 061 oz 495 061 02 495 . 02 495 .. 082 02 495 . 076 02 495 076 02 495 076 02 495 02 595 02 595 llSoz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 RC Scale/Wischers Continued page 155 photo twin-engined modet credited Hat Parenti Piper Comanche aircraft ac tually Beechcraft Baron worse dont know name builder Baron things happen tate night make photo prints dining tabte entarge wrong negative apotogies Hat December t988 cotumn photo cap tion ctaimed engine Bud Atkinsons Hawker Hurricane Genoah G-38 Obvi ousty shoutd have read Zenoah G-38 Finis As readers may have surmised due absence some recent issues MA cotumn marks end efforts authors RC Scate section atso marks second retirement first having 11 years ago Bob departed regutar emptoyment atways desire real freedom could never materiatize because pressing need meet MAs monthty deadtines facing typewriter btank piece paper wondering fill something new have atways resisted taking easy way out such fitting space product reviewsuntess product specificalty tended Scale models greatest part cotumn material originated own experi ences wett ideas gleaned conversations contests ralties 1988 Bob flew onty two contests first portions months cotumn contributed readers such contributions have rare Otis hoped reptacement writer whoever may wiOt have greater success obtaining materiat other Scale modelers efforts writing cotumn aided desire repay some pteasure gained modeling experience Writing has ted ac quiring new friends suc cinctly expressed assessment situation Everything everyone has lifespan RC Soaring/Blakeslee Continued page 45 both Sailplane Power types worldclass slope Fly want want frequencies permitting course As Wit says No judging no rules no hasslesonly fly ing looking swapping talking Flying wilt pre-registration clos es April 29 fee $30 includes en try fabulous raffle Saturday eve ning banquet Additional models $5 ad ditional dinners $18 Out-of-towners get good deal special rate Clover Island Inn $30 single $35 double room Call 800 833-1800 reservations banquet will held evening will also include slide presentation guest speaker Get entry check frequency fre quencies off now Wil Byers 632 Meadows Drive East Richiand WA 99352 Send Wil SASE youd like information en try form phone number 509 627-5224 Nordic Championships year Soar ing pilots Denmark Sweden Norway Fin land sometimes Iceland get together Nordic Championships use F3B rules rotate contest among four countries 1988 held Norway friend Preben Norholm lives Copenhagen sent pic tures interesting description what hap pened part Prebens letter green bird Grover designed flown Joakim Stahl Sweden Nor dic Champion 1986 87 won again year Joakim perfect F3B pilot cool aggressive always witting take calcu lated strategic risks white plane called Safir 2 de signed flown Karsten Jeppesen Den mark Karsten Nordic Champion 1985 runner-up year leading game un til last round lost due inferior judg ments Primary Strategic Distance Task Helper did lead him good thermal last Distance flight judged lift weaker actually consequently told him initiate speeding up too late fourminute slot make matters worse up against Stahi Karsten weather 24 legs lost 22 Stahls 23 told after wards spectacular slot con test didnt noticetoo busy wonder what language use Nor dic Championships Its very simplewe speak English Well least Finns listen ing Ocelandics dont speak Danish addition native language Danish Norwegian Swedish still closely re lated understand other talk slowly clearly Viking age spoke original Nordic language atmost identical Icelandic today nobody else understands now Since have influenced German English Dutch Also Danish especially influenced French during 17th 18th centuries So lucky everyone understands English nowa days 88 F3B Nordics took place fullscale gliding center Elverum some 100 miles north Oslo close Swedish border way Norwegian-Swedish border may easiest cross world First meet blue sign saying Border 1 km Shortly before reaching border 50 km 30 mph speed limit sign red sign saying Goods DeclareTurn Right Theres also green Nothing DeclareKeep Straight Fi nally theres sign canceling speed reduction youre Sweden Thats world should Eastern Iowa LSF Regional contest Terry Ed monds co-CD regional sent photo fliers has say about twoday contest would have thought hurricane could af fect Sailplane contest Iowa reality rem158 Model Aviation coior ia-views 50000 picures vi siucs S Ifl Stock MILS METOLS BOOKS 4LiTRES COIPETE CT0L0G $200 PREOTSION INSIRJiIENTS C4AfPIESL TULS ce 2100 8 S1 Ro
Edition: Model Aviation - 1989/02
Page Numbers: 42, 43, 154, 155, 158
CORRUGATIONS The Boeing biplanes 1928-32 era along numerous other aircraft attractive model subjects modeler has rejected graceful jaunty aircraft Scale projects because corrugated metal ailerons tail surfaces rounded corruga tions spaced 2-in centers too diffi cult reproduce large quantities Adding dilemma corrugations began ended flat material extending control surface edges Omission corrugations resulted model serious loss character Murrell E Wald informs us tooling method used build true-scale Boeing P-12 /8 size control surfaces made 005in lithoplate aluminum 005-in plate used small printing presses printing dustry differs 010-015-in olate Fj T 7 MOUNT ING BRACKETS NO 10-32 /THREADED RODS ASTEEL PLATES SPACED WITH WASHERS Fl II II WOOD HANDLE HEMISPHERICAL TIP ON FORMING TOOL RADIUS TO PROVIDE PROPER DEPTH OF CORRUGATION 005 THICKNESS OF ALUMINUM LITHOPLATE PLYWOOD SURROUNDS GRID FOR LEVEL WORKING SURFACE AE PLYWOOD BASE Bob Dolly describe Murrell E Walds method forming corrugations aluminum litho plate month simple tool/jig secret Forming tool can length music wire used printing large newspaper-size sheets find source 005-in plates look small local printing establishment litho plate used just once has scrap value Any printers ink remains sur face easily removed through application common solvent such lacquer thinner Murrells method consists stacking series steel plates accurately cut size interspersed spacers between pair plates form grid aluminum sheet held firmly position over grid de pressed spaces between grid plates hand-held forming tool Grid plates made low-carbon steel held alignment means pair threaded rods passing through accurately drilled holes plates rods should about 187-in dia meter Rods 10-32 thread standard hard ware store items come 1- 3-ft lengths spacers can No 10 washers used singly multiple combination grid plates 1929 Travel Air Mystery Ship Golden Age Models kit built Bob Schultheis L seen Winnebago RC Fliers All-Scale Fly-In held Oshkosh WI Power Webra 90 FInish Pactra Formula U over Silkspun Coverite Ralph Becks Curtiss JN-4D Jenny R prototype Proctor kit %-scale An 05 90 four-stroke powers 10-lb model Seen Broadhead WI Scale Rally 42 Model Aviation Radio Control Scale Bob Dolly Wischer S-221 Lapham Peak Rd Delafield Wi 53018 Jim Kummerows -scale Pober Pixie L built RCM plans uses Quadra 50 power Weight 24 lb finish Sig Koverall butyrate dope Seen Broadhead WI Scale Rally Don Wolks -scale EAA Biplane R originated Balsa USA kit Engine OS 90 fourstroke Plane spans 60 weighs 10 lb Unusual finish Rustoleum paint over Solartex washer thickness determines corrugation size spacing agree models scale completed grid mounted plywood base wood screws fastened through end brackets shown sketch surround ing area built up plywood flush top surface grid sanding neces sary assure flat top Murrell suggests hand-held forming tool made very hard steel preferably equipped wooden handle such used file firm pressure can applied form corrugation welts typical example 093- 125-in music wire end ground hemisphereor tool can made discarded scriber tool used stretch aluminum plate downward between grid plates multiple strokes necessary pro duce corrugations desired depth length particular application Murrell also suggests lithoplate held down along edges tape prevent its creeping away being formed Pencil guide lines drawn top plywood surface aid alignment first thought would appear enough grid plates stacked accommodate full aileron length example However larger number arent really needed small re cess made plywood adjacent grid provide space corrugations already made end lithoplate Begin making corrugations grid will allow remove hold-down tape shift aluminum right left completed corrugations fit recess plywood Tape plate down again last corrugation made pressed space tween first pair grid plates continue pressing additional corrugations can go indefinitely until full aileron length has made corrugations will automatically equally spaced long piece corrugated aluminum can made way few plates part carefully realigned after repositioning short practice session use handheld tool probably necessary produce smooth accurate scale welt aluminum Murrell assures Scale modelers endowed moderate talents can master con firmed technique method reproduction end result proved re warding 50 years modeling Samples sent best quality would en hance appearance Scale project ease handling would helpful make corrugations center large sheet cutting away excess aluminum material around edges afterward obtain final shape corrugations constantly chang ing length some layout work needed di rectly aluminum before work begins Continued page 154 IMPORTANT PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoy ment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacturers recommen dations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protec tion operating model engines permit objects touch turn ing propeller 7 To stop engine cut off fuel supply accordance manufacturers instructions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury ALWAYS FOLWW SAFETY PRECAUTIONS WINDSOR PROPELLER CO SANTA ROSA CALIF Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 oz $20001/4 scale 4 oz $2800 1/5 scale 3 az $24001/3 scale 9 oz $3200 Plus $500 postage packing Airmail z fast delivery send phone Visa orMastercharpe number FOURMOST PRODUCTS Innovative Model Products * Recoil Tubing * Fuel Fitting Sets 2 Sizes * Cockpit Coaming 4 sizes * 049/051 Airflo Engine Mount * 40 Airflo Engine Mount * Gapless Hinge 3 sizes * Gapless Hinge Slotter * Redi-Hinge 2 Sizes * Retractable Tow Hook * Bulkhead Fittings * Window Flange 3 sizes * Miter Master * Fuel Shutoff * Fuel Manifold * Fourmost Fillet 3 sizes * Flush Button * Bomb Release Fourmost Products has serving modeling public over 12 years continue develop innovative produots fill modeling needs information about unique tools accessories talk local hobby dealer send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 February 1989 43 Drawings EAA magazine used John Bishop build -scale 13-lb Corben Super Ace Engine 05 120 tourstroke An automatic trapdoor engine cooling effective special feature An other fine model Broadhead Rally AH DESIGNS 79 Pen-y-Maes Ave Rhyl Clwyd LL18 4ED UK Tel 745-53987 New Rocket Uses B C andO Engines5. Capability No Else Offers MRCs recent introduction 25 Moonbiaster inter mediate kit brings yet another technological advance MRCs Computer Aided Designs CAD built carry B4-2 06-3 engines However Moonblaster also commercially sold rocket kit includes easy-touse adapter also allows use powerful Dengines Bulitto take blast Moonblaster features large die-cut balsa fins blowmolded nose cone superb space capsule detailing Self stick decals 18chute Send free catalog See full line advanced MRC rockets hobby dealer cant help call us directly MRCG Model Rectifier Corporation 2500 Woodbridge Ave Edison NJ 08817 201 985-7800 coming mail has low think reason twofold First time between sues ie between Nats November issue no columns December issue normal col umns Also major parts country its fall pre-winter So outa-sight outa mind effect seeing column month combined season speculate lowers reader interest past weeksince December issue hit streetsthe mail back love Reflecting season issue will no doubt hands just about holiday time timely opportunity wish happy safe memorable holiday Andfor coming yearplease have noth ing happy safe quiet Electric landings Thank everyone giving opportu nity afforded column share fun Please forward comment question SASE please want reply author address given very top column RC AerobaticsNan Putte Continued page 41 elementary school librarian last item Henry Ham 251 Calle Canon de Faber Green Valley AZ 85614 wrote need help can test data Clark Y airfoil Reynolds numbers greater 87000 ob tamed has found data Reynolds num ber source 10-in chord Reyn olds number 87000 corresponds 12 mph Data 300000 would better can remember some old NACA reports Twenties Thirties covered wind tunnel tests Clark Y cant remember Reynolds number source anymore anyone can help Henry please write him Editors note sent copy Ron s column comments new Carl Goldberg Models kits manufacturer company could aware good not-so-good things said about mew models provide opportunity comment Noted flier Dave Patrick responded behalf com pany following being substance views Vector model has flown extensively K&B Sportster 45 OS 3SFP both using muffler pressure pressurize fitel tank recommended instruction booklet out fidel feed problem Dave recommended moving servo end steering pushrod hale closer servo shaft servo output arm/disc steering found too sensitive rather replace kits nose wheel steering arm longer unit Eagle 2 Dave expressed surprise kind balsa sample kit far off desired grade believes Carl Goldberg Models has quality controls among best indus try Concerning power plant feels strongly sport 40 engine racing engine too much airplane especially take offs made grass surface RMcM RC Scale/Wischers Continued page 43 few pencil lines will suffice Anyone thinking about flying all-metal Ford Trimotor Brace wires Streamlined wires flight surfac es Scale models have simulated vari ous meansor sometimes entirely eliminated Some modelers have gone great lengths make wires true miniature renditions actual shape rolled wires full-sized aircraft quite complete machine shop con junction expert machinists know-how becomes necessity anyone taking route best have seen made Merritt Zim merman pair hardened rollers having semielliptical shape peripheries equipped handcrank squeeze wire round stock streamlined shape Its tricky process expert because wire stretches being rolled its initial length must somewhat less fin ished product past have described own process using three parallel music wire lengths sol dered together filed sanded streamlined shape look great suffi ciently stiff prevent sagging small tension spring used end latest method manufacture called attention John Bishop visited bike shop found stainless steel bicycle spokes Racing cyclists use reduce drag rap idly revolving wheel come limited range lengths problem being sizes closely grouped around 12 fit stan dard racing wheels small variations length due fact some wheels laced spoke crossing three four other spokes also accommodate variations hub diameters full length spoke isnt flattened streamlined shape useful small aircraft brace wires tail surfaces advantages bike spoke end threaded 2-56a very common size Most Scale modelers have nuts threading taps #11 BIadesE~ 1i 40 Pad $485 Dehvered 100 Pad $895 Berkeley Trading CoCAEMO PO Box 26 Berkeley Springs WV 254112J Send 55on nor complete line 154 Model Aviation WORmS orocest SCALE E,oro seRVICE 800 000 RACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING 5ASE Enlarging Wt Jin Pepinon Catalog *OOSCALE PLANS ad PHOTO SEH VICE 3209 Madoon Geennbno NC 27403 psoe i1519l2925239 No cnIlocrl sioo BIIE5UDP EL IlL RIDOE iaIog MACHINERY TOOL 8 P0 Box 536-V omoog icane wv 25526 off Er 304-562-3538 complete selecnion lathes mills nools Aviation Modeler suit first inclination solder two spokes end-to-end greater length Anyone has attempted soldering 18-8 stainless steel past will recognize futility situa tion Simply stated cant done Ordinary sol der simply rolls off molten puddles tried high-temperature brazing nickel-silver alloy rod instant success made strong joint spoke cut 450 angle crease wetted area joint Excess braz ing alloy removed bench grinder joint dressed fine file sandpa per Silver solder works equally well expensive bike spokes available two usable shapes oval closely simulates desir able streamlined shape bladed flat shape rounded edges Oval spokes have body width 079 thickness 053 Bladed spokes have body 104 wide 039 thick Stainless spokes cheap ing priced about 27 oval 54C bladed price includes threaded nipple could used tightening wire sembly curved upset end spoke could used anchor end wire spoke nipple has slotted end screwdriver tensioning wire also provided flats wrench Stainless steel spokes perfectly straight such have come expect lengths music wire can flexed fairly straight line finger pressure course bike wheel spokes straighten easily because high tension used installed methods producing streamlined wires models really simulations provide illusion authenticity reality wires full-size airplane quite sharp edges feature extremely difficult re produce model addition large airplanes particular may HI TECH GLASS EPPLER 214 * 134 WINGSI TOTAL ENERGY SPAR ASSEMBUES airplane NI PERFORMANCE SAIIPLANES offers high quality line epoxies glass cloth laminates HP Cell wing sheeting skin fuselages wings Brochure send SASE Sample kit $800 HI PERFORMANCE SAILPLANES 1206 487-1721 17902 NE 156th 50 Woodinville WA 98072 10 FT B-17 PLANS $3500 3 CATALOGS $900 THE BE5T IN SCALE gag HOLMAN PO BOX 741 SAN BERNARDINO CA 92402 JET ENGINES DOYLEJE~ 195w log $500 letter $1200/year DOYLEJET 4015 San Jacinto#404G Houston TX 77004713 440-4744 have several different sizes wires depending used example loadbearing flying wires large biplane would 625 wide landing wires sup port wings ground 50 wide Brace wires tail surfaces dinarily smalleras little 375 streamlinedor may round wire 187-in diameter Scale modeler really concerned about accuracy authenticity model would need have access prototype measurements Photos three-view drawings provide enough detail satisfaction getting right rewards associated creation high-quality Scale model other hand dont look ac claim anyone another diehard Scale real 1st average observer wont know differ ence includes judges contest Fillets frustrations finish applica tion painted Scale model propensity finish pull away fillet forming void between paint fillet surface leaves angular fillet constantly varying di mensions place desirable smooth semicircular shape An otherwise finely finished model thereby flawed completely ruined problem has occurred some com mercial fillet materials including ad vertise immunity disease Brushed-finish coats less likely have problem sprayed coats extra thinner required paint cause spray properly seems have effect dreaded change shape transpires thinner penetrates fillet material softened have removed fillets after such change shape have found mate rial soft rubbery though hard earlier stage cure create barrier against penetration thinner giving fillet coat clear epoxy before final finishing schedule begun can either brushed sprayed use brush means edges brushed area need light sanding remove edge buildup epoxy small task No 180 silicon carbide paper may other masking techniques work equally well barrier however clear epoxy items stocked shelves down workshop Data source know very few Scale modelers have complete data bank reference documentation information us times will need help finding three-view drawing photos model construction drawings brought attention because almost mail readers consists requests docu mentation data Dr Lyle F Pepino has recognized need information now offers 66-page catalog listing model-building plans photo packs draw ing research service three-view drawings well plan-enlargement -reduction facil ity address Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 telephone 919 292-5239 latest catalog $4 $6 overseas catalog now includes plan min iatures reductions model con struction drawings give prospective cus tomer some idea what can expected along plan reviews Aviation videos VHS mat also listed Errata In September 1988 column Continued page 158 THE LEADER IN COMPETITION NEW SERIES 100 DIAPRICE 16 NEW p K NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCH PRICE 534 634 72833456 633/4s68 84566/7 94566/77 104566 106W8W 10BEW Ii4677776 115W 116EW 1167 124W 125W 1256 1356 14s6 1566 164N 16676 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I 6776 SERIES 400C 666I777 9777/ W WIDE BLADE EW EXTRA WIDE N NARROW February 1989 155 PROPELLERS TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 8 6778 67 676 PRO SERIES 3 Large Scale Miniature Aircraft Design end Drawings Herb Hell IMAA 1486 1 1/S5caieAewncaC3gtwino2700/pp 21/6 Scale SBC-3 Heildice 89 wing Sipe3000/pp 32-t/lt 0ca1e5505Dant/es-53wins3000/pp 41/S Scale AD3 09 Dogiw Skyraide3000/pp 9 High Wing Seginnor Dee Plane20OO/pp send 200 conpists catalog tw DP SysOems Inc. 1842 Tettenball Hoasnan TX 77806 /713/ 99948401713/ 8940868 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize TT-150-B 12 11-175-B .. 1-3/4 11-200-B TI-225-B .. 2-1/4 TI-226-B .. 2-114 FAll . TI-250-B .. 2-1/2 TT-251-B 112 FAll .. TT-275-B /4 TT-276-B /4 FAt 00-B 1T-301-BFAI 11-325-B .. 3-1/4 11-350-B .. 3-1/2 11-375-B . 4 11-400-B Retait Approx Price Weight $1395 058 oz 1495 095 oz 1595 100 02 169516002 1895150oz 189519002 2095170oz 2295220oz 2495200oz 269526002 2895250oz 369534002 499547002 5995520oz 6995570oz 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS Pan NoSize 11-140-A .. 1/4-28 TT-147-A .. 1/4-28/7mm . TT-610-A 10mm TT-710-A .. lx 10mm TT-516-A .. 5/16-24 TT-518-A .. 5/16-24/8mm TT-810-A x 10mm .. TT-825-A .8 x 125mm TT-375-A3/8-24 TI-125-A . lOx 125mm Reixil Approx Price Weighi $495 061 oz 495 061 02 495 . 02 495 .. 082 02 495 . 076 02 495 076 02 495 076 02 495 02 595 02 595 llSoz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 RC Scale/Wischers Continued page 155 photo twin-engined modet credited Hat Parenti Piper Comanche aircraft ac tually Beechcraft Baron worse dont know name builder Baron things happen tate night make photo prints dining tabte entarge wrong negative apotogies Hat December t988 cotumn photo cap tion ctaimed engine Bud Atkinsons Hawker Hurricane Genoah G-38 Obvi ousty shoutd have read Zenoah G-38 Finis As readers may have surmised due absence some recent issues MA cotumn marks end efforts authors RC Scate section atso marks second retirement first having 11 years ago Bob departed regutar emptoyment atways desire real freedom could never materiatize because pressing need meet MAs monthty deadtines facing typewriter btank piece paper wondering fill something new have atways resisted taking easy way out such fitting space product reviewsuntess product specificalty tended Scale models greatest part cotumn material originated own experi ences wett ideas gleaned conversations contests ralties 1988 Bob flew onty two contests first portions months cotumn contributed readers such contributions have rare Otis hoped reptacement writer whoever may wiOt have greater success obtaining materiat other Scale modelers efforts writing cotumn aided desire repay some pteasure gained modeling experience Writing has ted ac quiring new friends suc cinctly expressed assessment situation Everything everyone has lifespan RC Soaring/Blakeslee Continued page 45 both Sailplane Power types worldclass slope Fly want want frequencies permitting course As Wit says No judging no rules no hasslesonly fly ing looking swapping talking Flying wilt pre-registration clos es April 29 fee $30 includes en try fabulous raffle Saturday eve ning banquet Additional models $5 ad ditional dinners $18 Out-of-towners get good deal special rate Clover Island Inn $30 single $35 double room Call 800 833-1800 reservations banquet will held evening will also include slide presentation guest speaker Get entry check frequency fre quencies off now Wil Byers 632 Meadows Drive East Richiand WA 99352 Send Wil SASE youd like information en try form phone number 509 627-5224 Nordic Championships year Soar ing pilots Denmark Sweden Norway Fin land sometimes Iceland get together Nordic Championships use F3B rules rotate contest among four countries 1988 held Norway friend Preben Norholm lives Copenhagen sent pic tures interesting description what hap pened part Prebens letter green bird Grover designed flown Joakim Stahl Sweden Nor dic Champion 1986 87 won again year Joakim perfect F3B pilot cool aggressive always witting take calcu lated strategic risks white plane called Safir 2 de signed flown Karsten Jeppesen Den mark Karsten Nordic Champion 1985 runner-up year leading game un til last round lost due inferior judg ments Primary Strategic Distance Task Helper did lead him good thermal last Distance flight judged lift weaker actually consequently told him initiate speeding up too late fourminute slot make matters worse up against Stahi Karsten weather 24 legs lost 22 Stahls 23 told after wards spectacular slot con test didnt noticetoo busy wonder what language use Nor dic Championships Its very simplewe speak English Well least Finns listen ing Ocelandics dont speak Danish addition native language Danish Norwegian Swedish still closely re lated understand other talk slowly clearly Viking age spoke original Nordic language atmost identical Icelandic today nobody else understands now Since have influenced German English Dutch Also Danish especially influenced French during 17th 18th centuries So lucky everyone understands English nowa days 88 F3B Nordics took place fullscale gliding center Elverum some 100 miles north Oslo close Swedish border way Norwegian-Swedish border may easiest cross world First meet blue sign saying Border 1 km Shortly before reaching border 50 km 30 mph speed limit sign red sign saying Goods DeclareTurn Right Theres also green Nothing DeclareKeep Straight Fi nally theres sign canceling speed reduction youre Sweden Thats world should Eastern Iowa LSF Regional contest Terry Ed monds co-CD regional sent photo fliers has say about twoday contest would have thought hurricane could af fect Sailplane contest Iowa reality rem158 Model Aviation coior ia-views 50000 picures vi siucs S Ifl Stock MILS METOLS BOOKS 4LiTRES COIPETE CT0L0G $200 PREOTSION INSIRJiIENTS C4AfPIESL TULS ce 2100 8 S1 Ro
Edition: Model Aviation - 1989/02
Page Numbers: 42, 43, 154, 155, 158
CORRUGATIONS The Boeing biplanes 1928-32 era along numerous other aircraft attractive model subjects modeler has rejected graceful jaunty aircraft Scale projects because corrugated metal ailerons tail surfaces rounded corruga tions spaced 2-in centers too diffi cult reproduce large quantities Adding dilemma corrugations began ended flat material extending control surface edges Omission corrugations resulted model serious loss character Murrell E Wald informs us tooling method used build true-scale Boeing P-12 /8 size control surfaces made 005in lithoplate aluminum 005-in plate used small printing presses printing dustry differs 010-015-in olate Fj T 7 MOUNT ING BRACKETS NO 10-32 /THREADED RODS ASTEEL PLATES SPACED WITH WASHERS Fl II II WOOD HANDLE HEMISPHERICAL TIP ON FORMING TOOL RADIUS TO PROVIDE PROPER DEPTH OF CORRUGATION 005 THICKNESS OF ALUMINUM LITHOPLATE PLYWOOD SURROUNDS GRID FOR LEVEL WORKING SURFACE AE PLYWOOD BASE Bob Dolly describe Murrell E Walds method forming corrugations aluminum litho plate month simple tool/jig secret Forming tool can length music wire used printing large newspaper-size sheets find source 005-in plates look small local printing establishment litho plate used just once has scrap value Any printers ink remains sur face easily removed through application common solvent such lacquer thinner Murrells method consists stacking series steel plates accurately cut size interspersed spacers between pair plates form grid aluminum sheet held firmly position over grid de pressed spaces between grid plates hand-held forming tool Grid plates made low-carbon steel held alignment means pair threaded rods passing through accurately drilled holes plates rods should about 187-in dia meter Rods 10-32 thread standard hard ware store items come 1- 3-ft lengths spacers can No 10 washers used singly multiple combination grid plates 1929 Travel Air Mystery Ship Golden Age Models kit built Bob Schultheis L seen Winnebago RC Fliers All-Scale Fly-In held Oshkosh WI Power Webra 90 FInish Pactra Formula U over Silkspun Coverite Ralph Becks Curtiss JN-4D Jenny R prototype Proctor kit %-scale An 05 90 four-stroke powers 10-lb model Seen Broadhead WI Scale Rally 42 Model Aviation Radio Control Scale Bob Dolly Wischer S-221 Lapham Peak Rd Delafield Wi 53018 Jim Kummerows -scale Pober Pixie L built RCM plans uses Quadra 50 power Weight 24 lb finish Sig Koverall butyrate dope Seen Broadhead WI Scale Rally Don Wolks -scale EAA Biplane R originated Balsa USA kit Engine OS 90 fourstroke Plane spans 60 weighs 10 lb Unusual finish Rustoleum paint over Solartex washer thickness determines corrugation size spacing agree models scale completed grid mounted plywood base wood screws fastened through end brackets shown sketch surround ing area built up plywood flush top surface grid sanding neces sary assure flat top Murrell suggests hand-held forming tool made very hard steel preferably equipped wooden handle such used file firm pressure can applied form corrugation welts typical example 093- 125-in music wire end ground hemisphereor tool can made discarded scriber tool used stretch aluminum plate downward between grid plates multiple strokes necessary pro duce corrugations desired depth length particular application Murrell also suggests lithoplate held down along edges tape prevent its creeping away being formed Pencil guide lines drawn top plywood surface aid alignment first thought would appear enough grid plates stacked accommodate full aileron length example However larger number arent really needed small re cess made plywood adjacent grid provide space corrugations already made end lithoplate Begin making corrugations grid will allow remove hold-down tape shift aluminum right left completed corrugations fit recess plywood Tape plate down again last corrugation made pressed space tween first pair grid plates continue pressing additional corrugations can go indefinitely until full aileron length has made corrugations will automatically equally spaced long piece corrugated aluminum can made way few plates part carefully realigned after repositioning short practice session use handheld tool probably necessary produce smooth accurate scale welt aluminum Murrell assures Scale modelers endowed moderate talents can master con firmed technique method reproduction end result proved re warding 50 years modeling Samples sent best quality would en hance appearance Scale project ease handling would helpful make corrugations center large sheet cutting away excess aluminum material around edges afterward obtain final shape corrugations constantly chang ing length some layout work needed di rectly aluminum before work begins Continued page 154 IMPORTANT PROPELLER SAFETY MESSAGE safety precautions designed enhance enjoy ment model flying should part modelers routine both flying site workshop 1 Select correct propeller size following engine manufacturers recommen dations 2 Before using plastic props remove flash along edges propeller scraping pocket knife 3 Install propeller using correct nut washer airfoil side forward securely tighten Recheck after flight 4 Use chicken stick electric starter start engine make adjustments behind engine 5 Keep spectators least 20 feet away out path rotating propeller 6 Wear safety glasses hand protec tion operating model engines permit objects touch turn ing propeller 7 To stop engine cut off fuel supply accordance manufacturers instructions case DO NOT stop propeller hand other object 8 Inspect propeller after flight Discard propeller has nicks scratches other visible defect DO NOT repair alter way modify propeller 9 We strongly suggest propeller tips painted order increase visibility turning rotating propeller can cause serious personal injury ALWAYS FOLWW SAFETY PRECAUTIONS WINDSOR PROPELLER CO SANTA ROSA CALIF Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 oz $20001/4 scale 4 oz $2800 1/5 scale 3 az $24001/3 scale 9 oz $3200 Plus $500 postage packing Airmail z fast delivery send phone Visa orMastercharpe number FOURMOST PRODUCTS Innovative Model Products * Recoil Tubing * Fuel Fitting Sets 2 Sizes * Cockpit Coaming 4 sizes * 049/051 Airflo Engine Mount * 40 Airflo Engine Mount * Gapless Hinge 3 sizes * Gapless Hinge Slotter * Redi-Hinge 2 Sizes * Retractable Tow Hook * Bulkhead Fittings * Window Flange 3 sizes * Miter Master * Fuel Shutoff * Fuel Manifold * Fourmost Fillet 3 sizes * Flush Button * Bomb Release Fourmost Products has serving modeling public over 12 years continue develop innovative produots fill modeling needs information about unique tools accessories talk local hobby dealer send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 February 1989 43 Drawings EAA magazine used John Bishop build -scale 13-lb Corben Super Ace Engine 05 120 tourstroke An automatic trapdoor engine cooling effective special feature An other fine model Broadhead Rally AH DESIGNS 79 Pen-y-Maes Ave Rhyl Clwyd LL18 4ED UK Tel 745-53987 New Rocket Uses B C andO Engines5. Capability No Else Offers MRCs recent introduction 25 Moonbiaster inter mediate kit brings yet another technological advance MRCs Computer Aided Designs CAD built carry B4-2 06-3 engines However Moonblaster also commercially sold rocket kit includes easy-touse adapter also allows use powerful Dengines Bulitto take blast Moonblaster features large die-cut balsa fins blowmolded nose cone superb space capsule detailing Self stick decals 18chute Send free catalog See full line advanced MRC rockets hobby dealer cant help call us directly MRCG Model Rectifier Corporation 2500 Woodbridge Ave Edison NJ 08817 201 985-7800 coming mail has low think reason twofold First time between sues ie between Nats November issue no columns December issue normal col umns Also major parts country its fall pre-winter So outa-sight outa mind effect seeing column month combined season speculate lowers reader interest past weeksince December issue hit streetsthe mail back love Reflecting season issue will no doubt hands just about holiday time timely opportunity wish happy safe memorable holiday Andfor coming yearplease have noth ing happy safe quiet Electric landings Thank everyone giving opportu nity afforded column share fun Please forward comment question SASE please want reply author address given very top column RC AerobaticsNan Putte Continued page 41 elementary school librarian last item Henry Ham 251 Calle Canon de Faber Green Valley AZ 85614 wrote need help can test data Clark Y airfoil Reynolds numbers greater 87000 ob tamed has found data Reynolds num ber source 10-in chord Reyn olds number 87000 corresponds 12 mph Data 300000 would better can remember some old NACA reports Twenties Thirties covered wind tunnel tests Clark Y cant remember Reynolds number source anymore anyone can help Henry please write him Editors note sent copy Ron s column comments new Carl Goldberg Models kits manufacturer company could aware good not-so-good things said about mew models provide opportunity comment Noted flier Dave Patrick responded behalf com pany following being substance views Vector model has flown extensively K&B Sportster 45 OS 3SFP both using muffler pressure pressurize fitel tank recommended instruction booklet out fidel feed problem Dave recommended moving servo end steering pushrod hale closer servo shaft servo output arm/disc steering found too sensitive rather replace kits nose wheel steering arm longer unit Eagle 2 Dave expressed surprise kind balsa sample kit far off desired grade believes Carl Goldberg Models has quality controls among best indus try Concerning power plant feels strongly sport 40 engine racing engine too much airplane especially take offs made grass surface RMcM RC Scale/Wischers Continued page 43 few pencil lines will suffice Anyone thinking about flying all-metal Ford Trimotor Brace wires Streamlined wires flight surfac es Scale models have simulated vari ous meansor sometimes entirely eliminated Some modelers have gone great lengths make wires true miniature renditions actual shape rolled wires full-sized aircraft quite complete machine shop con junction expert machinists know-how becomes necessity anyone taking route best have seen made Merritt Zim merman pair hardened rollers having semielliptical shape peripheries equipped handcrank squeeze wire round stock streamlined shape Its tricky process expert because wire stretches being rolled its initial length must somewhat less fin ished product past have described own process using three parallel music wire lengths sol dered together filed sanded streamlined shape look great suffi ciently stiff prevent sagging small tension spring used end latest method manufacture called attention John Bishop visited bike shop found stainless steel bicycle spokes Racing cyclists use reduce drag rap idly revolving wheel come limited range lengths problem being sizes closely grouped around 12 fit stan dard racing wheels small variations length due fact some wheels laced spoke crossing three four other spokes also accommodate variations hub diameters full length spoke isnt flattened streamlined shape useful small aircraft brace wires tail surfaces advantages bike spoke end threaded 2-56a very common size Most Scale modelers have nuts threading taps #11 BIadesE~ 1i 40 Pad $485 Dehvered 100 Pad $895 Berkeley Trading CoCAEMO PO Box 26 Berkeley Springs WV 254112J Send 55on nor complete line 154 Model Aviation WORmS orocest SCALE E,oro seRVICE 800 000 RACKS PLANS 3 VIEWS PHOTO-PACKS PLANS ENLARGING 5ASE Enlarging Wt Jin Pepinon Catalog *OOSCALE PLANS ad PHOTO SEH VICE 3209 Madoon Geennbno NC 27403 psoe i1519l2925239 No cnIlocrl sioo BIIE5UDP EL IlL RIDOE iaIog MACHINERY TOOL 8 P0 Box 536-V omoog icane wv 25526 off Er 304-562-3538 complete selecnion lathes mills nools Aviation Modeler suit first inclination solder two spokes end-to-end greater length Anyone has attempted soldering 18-8 stainless steel past will recognize futility situa tion Simply stated cant done Ordinary sol der simply rolls off molten puddles tried high-temperature brazing nickel-silver alloy rod instant success made strong joint spoke cut 450 angle crease wetted area joint Excess braz ing alloy removed bench grinder joint dressed fine file sandpa per Silver solder works equally well expensive bike spokes available two usable shapes oval closely simulates desir able streamlined shape bladed flat shape rounded edges Oval spokes have body width 079 thickness 053 Bladed spokes have body 104 wide 039 thick Stainless spokes cheap ing priced about 27 oval 54C bladed price includes threaded nipple could used tightening wire sembly curved upset end spoke could used anchor end wire spoke nipple has slotted end screwdriver tensioning wire also provided flats wrench Stainless steel spokes perfectly straight such have come expect lengths music wire can flexed fairly straight line finger pressure course bike wheel spokes straighten easily because high tension used installed methods producing streamlined wires models really simulations provide illusion authenticity reality wires full-size airplane quite sharp edges feature extremely difficult re produce model addition large airplanes particular may HI TECH GLASS EPPLER 214 * 134 WINGSI TOTAL ENERGY SPAR ASSEMBUES airplane NI PERFORMANCE SAIIPLANES offers high quality line epoxies glass cloth laminates HP Cell wing sheeting skin fuselages wings Brochure send SASE Sample kit $800 HI PERFORMANCE SAILPLANES 1206 487-1721 17902 NE 156th 50 Woodinville WA 98072 10 FT B-17 PLANS $3500 3 CATALOGS $900 THE BE5T IN SCALE gag HOLMAN PO BOX 741 SAN BERNARDINO CA 92402 JET ENGINES DOYLEJE~ 195w log $500 letter $1200/year DOYLEJET 4015 San Jacinto#404G Houston TX 77004713 440-4744 have several different sizes wires depending used example loadbearing flying wires large biplane would 625 wide landing wires sup port wings ground 50 wide Brace wires tail surfaces dinarily smalleras little 375 streamlinedor may round wire 187-in diameter Scale modeler really concerned about accuracy authenticity model would need have access prototype measurements Photos three-view drawings provide enough detail satisfaction getting right rewards associated creation high-quality Scale model other hand dont look ac claim anyone another diehard Scale real 1st average observer wont know differ ence includes judges contest Fillets frustrations finish applica tion painted Scale model propensity finish pull away fillet forming void between paint fillet surface leaves angular fillet constantly varying di mensions place desirable smooth semicircular shape An otherwise finely finished model thereby flawed completely ruined problem has occurred some com mercial fillet materials including ad vertise immunity disease Brushed-finish coats less likely have problem sprayed coats extra thinner required paint cause spray properly seems have effect dreaded change shape transpires thinner penetrates fillet material softened have removed fillets after such change shape have found mate rial soft rubbery though hard earlier stage cure create barrier against penetration thinner giving fillet coat clear epoxy before final finishing schedule begun can either brushed sprayed use brush means edges brushed area need light sanding remove edge buildup epoxy small task No 180 silicon carbide paper may other masking techniques work equally well barrier however clear epoxy items stocked shelves down workshop Data source know very few Scale modelers have complete data bank reference documentation information us times will need help finding three-view drawing photos model construction drawings brought attention because almost mail readers consists requests docu mentation data Dr Lyle F Pepino has recognized need information now offers 66-page catalog listing model-building plans photo packs draw ing research service three-view drawings well plan-enlargement -reduction facil ity address Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 telephone 919 292-5239 latest catalog $4 $6 overseas catalog now includes plan min iatures reductions model con struction drawings give prospective cus tomer some idea what can expected along plan reviews Aviation videos VHS mat also listed Errata In September 1988 column Continued page 158 THE LEADER IN COMPETITION NEW SERIES 100 DIAPRICE 16 NEW p K NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCH PRICE 534 634 72833456 633/4s68 84566/7 94566/77 104566 106W8W 10BEW Ii4677776 115W 116EW 1167 124W 125W 1256 1356 14s6 1566 164N 16676 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I 6776 SERIES 400C 666I777 9777/ W WIDE BLADE EW EXTRA WIDE N NARROW February 1989 155 PROPELLERS TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 8 6778 67 676 PRO SERIES 3 Large Scale Miniature Aircraft Design end Drawings Herb Hell IMAA 1486 1 1/S5caieAewncaC3gtwino2700/pp 21/6 Scale SBC-3 Heildice 89 wing Sipe3000/pp 32-t/lt 0ca1e5505Dant/es-53wins3000/pp 41/S Scale AD3 09 Dogiw Skyraide3000/pp 9 High Wing Seginnor Dee Plane20OO/pp send 200 conpists catalog tw DP SysOems Inc. 1842 Tettenball Hoasnan TX 77806 /713/ 99948401713/ 8940868 PRECISION MODEL PRODUCTS Made U S BARSTOCK ALUMINUM SPINNERS Pan NoSize TT-150-B 12 11-175-B .. 1-3/4 11-200-B TI-225-B .. 2-1/4 TI-226-B .. 2-114 FAll . TI-250-B .. 2-1/2 TT-251-B 112 FAll .. TT-275-B /4 TT-276-B /4 FAt 00-B 1T-301-BFAI 11-325-B .. 3-1/4 11-350-B .. 3-1/2 11-375-B . 4 11-400-B Retait Approx Price Weight $1395 058 oz 1495 095 oz 1595 100 02 169516002 1895150oz 189519002 2095170oz 2295220oz 2495200oz 269526002 2895250oz 369534002 499547002 5995520oz 6995570oz 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS Pan NoSize 11-140-A .. 1/4-28 TT-147-A .. 1/4-28/7mm . TT-610-A 10mm TT-710-A .. lx 10mm TT-516-A .. 5/16-24 TT-518-A .. 5/16-24/8mm TT-810-A x 10mm .. TT-825-A .8 x 125mm TT-375-A3/8-24 TI-125-A . lOx 125mm Reixil Approx Price Weighi $495 061 oz 495 061 02 495 . 02 495 .. 082 02 495 . 076 02 495 076 02 495 076 02 495 02 595 02 595 llSoz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 RC Scale/Wischers Continued page 155 photo twin-engined modet credited Hat Parenti Piper Comanche aircraft ac tually Beechcraft Baron worse dont know name builder Baron things happen tate night make photo prints dining tabte entarge wrong negative apotogies Hat December t988 cotumn photo cap tion ctaimed engine Bud Atkinsons Hawker Hurricane Genoah G-38 Obvi ousty shoutd have read Zenoah G-38 Finis As readers may have surmised due absence some recent issues MA cotumn marks end efforts authors RC Scate section atso marks second retirement first having 11 years ago Bob departed regutar emptoyment atways desire real freedom could never materiatize because pressing need meet MAs monthty deadtines facing typewriter btank piece paper wondering fill something new have atways resisted taking easy way out such fitting space product reviewsuntess product specificalty tended Scale models greatest part cotumn material originated own experi ences wett ideas gleaned conversations contests ralties 1988 Bob flew onty two contests first portions months cotumn contributed readers such contributions have rare Otis hoped reptacement writer whoever may wiOt have greater success obtaining materiat other Scale modelers efforts writing cotumn aided desire repay some pteasure gained modeling experience Writing has ted ac quiring new friends suc cinctly expressed assessment situation Everything everyone has lifespan RC Soaring/Blakeslee Continued page 45 both Sailplane Power types worldclass slope Fly want want frequencies permitting course As Wit says No judging no rules no hasslesonly fly ing looking swapping talking Flying wilt pre-registration clos es April 29 fee $30 includes en try fabulous raffle Saturday eve ning banquet Additional models $5 ad ditional dinners $18 Out-of-towners get good deal special rate Clover Island Inn $30 single $35 double room Call 800 833-1800 reservations banquet will held evening will also include slide presentation guest speaker Get entry check frequency fre quencies off now Wil Byers 632 Meadows Drive East Richiand WA 99352 Send Wil SASE youd like information en try form phone number 509 627-5224 Nordic Championships year Soar ing pilots Denmark Sweden Norway Fin land sometimes Iceland get together Nordic Championships use F3B rules rotate contest among four countries 1988 held Norway friend Preben Norholm lives Copenhagen sent pic tures interesting description what hap pened part Prebens letter green bird Grover designed flown Joakim Stahl Sweden Nor dic Champion 1986 87 won again year Joakim perfect F3B pilot cool aggressive always witting take calcu lated strategic risks white plane called Safir 2 de signed flown Karsten Jeppesen Den mark Karsten Nordic Champion 1985 runner-up year leading game un til last round lost due inferior judg ments Primary Strategic Distance Task Helper did lead him good thermal last Distance flight judged lift weaker actually consequently told him initiate speeding up too late fourminute slot make matters worse up against Stahi Karsten weather 24 legs lost 22 Stahls 23 told after wards spectacular slot con test didnt noticetoo busy wonder what language use Nor dic Championships Its very simplewe speak English Well least Finns listen ing Ocelandics dont speak Danish addition native language Danish Norwegian Swedish still closely re lated understand other talk slowly clearly Viking age spoke original Nordic language atmost identical Icelandic today nobody else understands now Since have influenced German English Dutch Also Danish especially influenced French during 17th 18th centuries So lucky everyone understands English nowa days 88 F3B Nordics took place fullscale gliding center Elverum some 100 miles north Oslo close Swedish border way Norwegian-Swedish border may easiest cross world First meet blue sign saying Border 1 km Shortly before reaching border 50 km 30 mph speed limit sign red sign saying Goods DeclareTurn Right Theres also green Nothing DeclareKeep Straight Fi nally theres sign canceling speed reduction youre Sweden Thats world should Eastern Iowa LSF Regional contest Terry Ed monds co-CD regional sent photo fliers has say about twoday contest would have thought hurricane could af fect Sailplane contest Iowa reality rem158 Model Aviation coior ia-views 50000 picures vi siucs S Ifl Stock MILS METOLS BOOKS 4LiTRES COIPETE CT0L0G $200 PREOTSION INSIRJiIENTS C4AfPIESL TULS ce 2100 8 S1 Ro