JUST received new K&B 65 engines have under development past couple ye ars had some conversations over last year young John Brodbeck K&B about engine design comment basically new engine completely cor rect Ill outline some differences obvious Perhaps lower production cost perhaps easier changes later internally engine new Johns comment part would interchange old engines glow plug very nearly true quite parts redesigned different enough declare engine new engine First off cylinder head now twopiece head clamp ring head button apparent departure previous K&B practice since cannot remember ever having produced engine feature course obvious advantage racing flier quite lot easier change combustion chamber shapes using button versus integral head new head/clamp ring/button will work older engines combustion chamber shape appears standard K&B top hat design fairly wide squish band flattened hemispherical chamber dont know so-called high performance head available forthis engine K&B head double bubble cham ber shape believe older heads will work engine wanted use head shape cutting button head assembly now held crankcase W 4-40 cap screws rather Ye before should help head bolt stripping problem constant source irritation old design Bruce Teffeau matched pair SWCLM Big Goodycars Cosmic Wind kits Goldbergh Big Goodyear continues gain between new version 65 old Externally engine identical old version least some minor excep tions physical dimensions same previous model changes have made internally some obviously cure weak points older version some Moving down engine cylinder liner/piston/connecting rod new first thing find cylinder liner walls somewhat thicker Since bore stroke engine havent changed results outer diameter cylinder liner being larger older engines new liner will fit old case vice versa dont know liner thickened have experienced no trouble old engines could attribute too-thin liner have heard some scuttle-butt liners tendency work engines really being pushed hard RC Pylon boys liner flexing enough cause power loss Youll also notice exhaust port now has bar old engines did John comment solid aluminum piston experi enced pistons hanging up exhaust port old design Obviously thicker liner bar exhaust port will prevent occurring connecting rod real bear new engine As probably know K&B 65 now 75 very competitive engine use boat racing application puts far greater strain engines use make Control Line Racing Connecting rods old design very significant weak spot boat boys can imagine stress occurs take engine Continued page 120 48 Model Aviation Little Mike Big Goodyear kitted Bob Reynolds Tuscon AR version neatly handled Bob Gutscher Now really clean Goodyear Bob Lawrence Feast eyes spectacular configuration racylooking paint scheme delicate pin stripe Right Side view outlines look equally good cheek fairs smoothly wing root OUR AIM T FLYING SPECIALIZING IN OX FF KITS AND ENGINES FOR THE COMPETITOR WE HAVE TH HOT EQUIPMENT hterprises 4 2 lack fire breathing quality AMA types 3 have adjustments make needle compression 4 can very nasty especially its cold bite fingers Whats going return old days will continue $30 gallon fuel $200 plugs $150 props lines $350 go Americans seem reviewing priorities automobiles remember 426 Hemi king its either moderate perish according authorities Probably often asked question has make Fox run suction So far hasnt totally satisfactory answer youll get either As Ive said before have seal up stock restrictor air goes around restrictor rather through Some balsa wedged will can use 5-minute epoxy little heat will make fall right out carved down piece fairly hard wood fit square opening drilled down center Stick engine drill hole spraybar Find nice cone-shaped bit Dremel make nice venturi shape both ends hardwood can extend out stock venturi give ram effect just look weird sure coat inside wood epoxy fuel soon melts venturi find uri draws just fine should can bore out next drill size sooner later youll get too big youve lost piece hardwood Go back drill size youre business Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Racing/Lee continued page 48 running well over 25000 rpm dump water Instant destruction new rod much stronger old machined out 7075-T6 aluminum has very nearly double cross-sectional area old rod its longer between centers old rod too right 050 What means case has have some milling done ports side engine rod will clear longer rod means piston wrist pin placed closer top piston means engine longer rod has less side thrust piston running well lower piston speed same rpm has translate hp slight few places engine have experienced problem previous model has rear rotor assembly old engine aluminum rotor running steel rotor pin against chromed aluminum backplate rotor milled out back side balance purposes small portion actually rubbed against backplate Due pressure fluctuations crankcase rotor pressed tightly against backplate during portion rotation during remaining portion being allowed basically float free pressed tightly against backplate would wear side opposite intake cut-out Usually wear slight didnt seem affect engine perfor mance until suddenly stopped working once usually middle finals somewhere have keep close eye backplate/rotor assemblies old engines new engine appears have fixed problem rotor steel chrome plated running against aluminum backplate should effectively stop wear experienced old engines nice part assembly will work old engines So got lucky crankshaft front end modi fied too crank has enlarged just behind front bearing clear back before nominal 375 now 467 will obviously make crank virtually unbreakable although problem have encountered older versions engines front end housing has modified slightly flat spot milled top rear bearing housing oil hole drilled through area immediately front rear bearing Obviously improved lubrication rea son Again got lucky new front end crankshaft will fit older engines ONLY complete assembly initial impressions new engine very good engine has made better Ive running K&B engines Rats ever since Ive flying new 65 Ill future Mouse Race NATS Mouse racers planning being Nats Lincoln summer should plan bringing equipment along fly though Mouse popular events parts country still provisional event isnt flown officially Nats year last unofficial Class Mouse will flown Tuesday Nats week being spon sored Orbiting Eagies Omaha Nebraska trophies possibly some merchandise coming Cox information comes Vince Mankowski Vice President District IX years Nats Control Line Category Direc tor So Mousers should come prepared event perhaps good showing will convince Nats officialdom reinstate event TR Nat Bill Wright will running TR years Nats did last year Lake Charles Only year working up new model description form somewhat different previously trying get available sent TR entrants along Nats entry packet know red tape flows slowly might possible going fly TR Nats might want contact Bill address Bill Wright 2712 Seminole Dr Indepen dance MO 64057 Bill Lee 3522 Tamarisk Lane Missouri City TX 77459 Albatross/Kelly continued page 50 canard front wing controlled causes canard roll indepen dently rest airframe Canard pitch control straightforward full-flying control surface Another lever warps main wing make flat turns introducing differential drag increased lift inboard wing overall weight reduced 70 55 lb power required maintain level flight reduced third 033 025 hp improvements did come easily new has ribs provide better airfoil contour details like using Kevlar place piano wire control system new urethane material replace conventional bicycle chain made possible small increments weight reduction taken together add up 15 lb total weight thousand lightening holes foam ribs 5 oz main wing canard 1 20 Model Aviation PLANES 1355 Er*i Road BOATS PO Box 227 CARS Pangli Center TRAINS Van Wilt ON 45196 Jan Gus *4191 2382625 WE BUY OR TRADE OLD ENGINES AND KITS
Edition: Model Aviation - 1979/08
Page Numbers: 48, 120
JUST received new K&B 65 engines have under development past couple ye ars had some conversations over last year young John Brodbeck K&B about engine design comment basically new engine completely cor rect Ill outline some differences obvious Perhaps lower production cost perhaps easier changes later internally engine new Johns comment part would interchange old engines glow plug very nearly true quite parts redesigned different enough declare engine new engine First off cylinder head now twopiece head clamp ring head button apparent departure previous K&B practice since cannot remember ever having produced engine feature course obvious advantage racing flier quite lot easier change combustion chamber shapes using button versus integral head new head/clamp ring/button will work older engines combustion chamber shape appears standard K&B top hat design fairly wide squish band flattened hemispherical chamber dont know so-called high performance head available forthis engine K&B head double bubble cham ber shape believe older heads will work engine wanted use head shape cutting button head assembly now held crankcase W 4-40 cap screws rather Ye before should help head bolt stripping problem constant source irritation old design Bruce Teffeau matched pair SWCLM Big Goodycars Cosmic Wind kits Goldbergh Big Goodyear continues gain between new version 65 old Externally engine identical old version least some minor excep tions physical dimensions same previous model changes have made internally some obviously cure weak points older version some Moving down engine cylinder liner/piston/connecting rod new first thing find cylinder liner walls somewhat thicker Since bore stroke engine havent changed results outer diameter cylinder liner being larger older engines new liner will fit old case vice versa dont know liner thickened have experienced no trouble old engines could attribute too-thin liner have heard some scuttle-butt liners tendency work engines really being pushed hard RC Pylon boys liner flexing enough cause power loss Youll also notice exhaust port now has bar old engines did John comment solid aluminum piston experi enced pistons hanging up exhaust port old design Obviously thicker liner bar exhaust port will prevent occurring connecting rod real bear new engine As probably know K&B 65 now 75 very competitive engine use boat racing application puts far greater strain engines use make Control Line Racing Connecting rods old design very significant weak spot boat boys can imagine stress occurs take engine Continued page 120 48 Model Aviation Little Mike Big Goodyear kitted Bob Reynolds Tuscon AR version neatly handled Bob Gutscher Now really clean Goodyear Bob Lawrence Feast eyes spectacular configuration racylooking paint scheme delicate pin stripe Right Side view outlines look equally good cheek fairs smoothly wing root OUR AIM T FLYING SPECIALIZING IN OX FF KITS AND ENGINES FOR THE COMPETITOR WE HAVE TH HOT EQUIPMENT hterprises 4 2 lack fire breathing quality AMA types 3 have adjustments make needle compression 4 can very nasty especially its cold bite fingers Whats going return old days will continue $30 gallon fuel $200 plugs $150 props lines $350 go Americans seem reviewing priorities automobiles remember 426 Hemi king its either moderate perish according authorities Probably often asked question has make Fox run suction So far hasnt totally satisfactory answer youll get either As Ive said before have seal up stock restrictor air goes around restrictor rather through Some balsa wedged will can use 5-minute epoxy little heat will make fall right out carved down piece fairly hard wood fit square opening drilled down center Stick engine drill hole spraybar Find nice cone-shaped bit Dremel make nice venturi shape both ends hardwood can extend out stock venturi give ram effect just look weird sure coat inside wood epoxy fuel soon melts venturi find uri draws just fine should can bore out next drill size sooner later youll get too big youve lost piece hardwood Go back drill size youre business Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Racing/Lee continued page 48 running well over 25000 rpm dump water Instant destruction new rod much stronger old machined out 7075-T6 aluminum has very nearly double cross-sectional area old rod its longer between centers old rod too right 050 What means case has have some milling done ports side engine rod will clear longer rod means piston wrist pin placed closer top piston means engine longer rod has less side thrust piston running well lower piston speed same rpm has translate hp slight few places engine have experienced problem previous model has rear rotor assembly old engine aluminum rotor running steel rotor pin against chromed aluminum backplate rotor milled out back side balance purposes small portion actually rubbed against backplate Due pressure fluctuations crankcase rotor pressed tightly against backplate during portion rotation during remaining portion being allowed basically float free pressed tightly against backplate would wear side opposite intake cut-out Usually wear slight didnt seem affect engine perfor mance until suddenly stopped working once usually middle finals somewhere have keep close eye backplate/rotor assemblies old engines new engine appears have fixed problem rotor steel chrome plated running against aluminum backplate should effectively stop wear experienced old engines nice part assembly will work old engines So got lucky crankshaft front end modi fied too crank has enlarged just behind front bearing clear back before nominal 375 now 467 will obviously make crank virtually unbreakable although problem have encountered older versions engines front end housing has modified slightly flat spot milled top rear bearing housing oil hole drilled through area immediately front rear bearing Obviously improved lubrication rea son Again got lucky new front end crankshaft will fit older engines ONLY complete assembly initial impressions new engine very good engine has made better Ive running K&B engines Rats ever since Ive flying new 65 Ill future Mouse Race NATS Mouse racers planning being Nats Lincoln summer should plan bringing equipment along fly though Mouse popular events parts country still provisional event isnt flown officially Nats year last unofficial Class Mouse will flown Tuesday Nats week being spon sored Orbiting Eagies Omaha Nebraska trophies possibly some merchandise coming Cox information comes Vince Mankowski Vice President District IX years Nats Control Line Category Direc tor So Mousers should come prepared event perhaps good showing will convince Nats officialdom reinstate event TR Nat Bill Wright will running TR years Nats did last year Lake Charles Only year working up new model description form somewhat different previously trying get available sent TR entrants along Nats entry packet know red tape flows slowly might possible going fly TR Nats might want contact Bill address Bill Wright 2712 Seminole Dr Indepen dance MO 64057 Bill Lee 3522 Tamarisk Lane Missouri City TX 77459 Albatross/Kelly continued page 50 canard front wing controlled causes canard roll indepen dently rest airframe Canard pitch control straightforward full-flying control surface Another lever warps main wing make flat turns introducing differential drag increased lift inboard wing overall weight reduced 70 55 lb power required maintain level flight reduced third 033 025 hp improvements did come easily new has ribs provide better airfoil contour details like using Kevlar place piano wire control system new urethane material replace conventional bicycle chain made possible small increments weight reduction taken together add up 15 lb total weight thousand lightening holes foam ribs 5 oz main wing canard 1 20 Model Aviation PLANES 1355 Er*i Road BOATS PO Box 227 CARS Pangli Center TRAINS Van Wilt ON 45196 Jan Gus *4191 2382625 WE BUY OR TRADE OLD ENGINES AND KITS