iKtiiti Pylon Racing Bill Hager RETALIATION talk years Championship Race some countrys top Formula fliers about effort planned putting out FAI Pylon Yes seems though got ears pinned back F3D years AMA Nationals World Championships dont like So what about work harder maybe next time will turn Come guys Lets get going interested FAI Pylon F3D some tips passed Art Arro ebb Tuned Pipes 35 ________ _________ 1 OZ EnZZZii 65cc _______ ___________11 W 2 oz tijjiz 75cc _____________________12A EZI2~ 85cc 10cc Muffled Tuned Pipes 35cc -6h___________12 2hoz TUNING THE PIPE first lesson tuning learn no single optimum pipe length engine sizes brands etc What works someone else may work fuel prop aircraft exhaust duration blowdown time compression ratio factors influence length TP/TPM tuned-pipe/tuned-pipe muffler Proper TP/TPM length can ly obtained flight testing experi mentationjust like propellers 1 begin process need good tach cutting tool such tube-cutter hacksaw Select flying prop slightly smaller order duplicate unloaded condition encountered flight hesitate recom mend test prop since some rpm addicts use little toothpick just enough area provide airflow engine cooling Run engine TP/ TPM stock condition test stand Record peak rpm Remove TP/ TPM cut quarter inch off header pipe Always cut header pipe unless some special mounting geometry angles cowl clearance etc re quires cutting pipe Carefully remove burrs particles cutting operation since debris left header TP/TPM will usually find itself inside engine later date Reassemble setup run engine again record peak rpm should note slight increase Continue shorten header Y4-in increments un til no rpm increase noted pipe too short engine will surge peak 65cc6W 3hoz 6W 34 oz c7A EizzIIIiiiiIIii 10cc 4 oz Theres lot Info setting up pipes months column Illustration MACS Products Just show some sizesltypes available may very peaky setting needle vaive Actually optimum length slightly longer surging condition lengthen TP/TPM sert cutoff pieces within silicone coupler reattach pipe header Most TP/TPMs available market have fairly broad rpm range should on-the-pipe statically just after takeoff dont want ad just TP/TPM length short have dive steeply achieve resonance Pylon Racing engine will probably fall off pipe lug down tight turn short pipe length works well RC speed attempts though 2 length TP/TPM arbi trary measurement no standards effect Some guys measure distance between end divergent cone apex centerline glow plug Others use distance between ex haust flange face piston apex overall length including stinger outlet obtain known pipe length sure get standards measurement simple inconsisten cy has resulted great deal grief operating TP/TPM 3 As TP/TPM resonance reached rpm will increase needle valve sensitivity lost normal condi tion since TP/TPM actually domi nates engines running characteristics proper tune needle valve merely controls engines running temperature sure always back down rich side avoid cooking engine generally back down 300-700 rpm absolute peak can detect quickly pinching fuel line noting rpm rise Continued page 148 58 Model Aviation RC greats time Alex Schneider Alex won Nationals tWree times ushered era multi-reed con trol systems Like us have time time Alex dropped out model ing some years ago Its addiction cant really kick forever though hes getting back swing things Giant Scale isnt anything new him models flying Fifties wingspans 714 nine feet perfect weekend may getting activity much would like I right Correction time December issue photo got credited mistake insightful character study George Priveteer actually taken STARS member Ed Bush STARS Rally last July Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 RC Pylon Racing/Hager Continued page 58 4 When operating TP/TPM recommended standardize fly ing setup respect fuel especially nitro content props glow plug fly ing course can compensate weather changes changing prop length TP/TPM As air den sity drops may have lengthen TP/TPM reduce prop load crease nitro compensate much change needed product experience Just remember no nitro allowed F3D Pylon 5 An alternate mounting method slide TP/TPM large-diameter mini-pipe such made K&B Prather Products Use high-tempera ture RTV red color sealant made GE Dow secure TP/TPM mini-pipe should also use silicone coupler seal junction between TP/TPM mini-pipe mini-pipe-TP/TPM assembly mounted engine via exhaust manifold 0-ring provide extra mounting insurance using two music wire hooks spring retainer secured mini-pipe stretched around engine cylinder disadvantage method pipe length relatively fixed cannot optimized weather conditions fuel prop load However excellent economical mounting methodespecially have known pipe length couple mini-pipes lying around ENGINE MODIFICATION best performance increase TP/TPM will result optimizing engine device Some engines per form better initially TP/TPM others will show small perfor mance gain stock configuration several engine modifications needed realize maximum performance TP/TPM 1 first modification lower compression ratio adding head shims gaskets account supercharging effect provided TP/TPM deck clearance generally should less 010 inches instances Recommended deck clear ances 012-018 range have some nitro fuel Blowing plugs running hot etc sure sign too high compression ratio Ideally should increase combustion chamber volume retain deck clearance about 012 2 If have access lathe good machinist make up new combus tion chamber deep bowl highroof configuration see what Im talk ing about locate ducted fan pilot uses K&B 75 engine longreach combustion chamber part no 9157 head shape will reduce detona tion generally improve plug life over stock head 3 While subject plugs strongly recommend both OPS RC 300 Rossi R-7 R-8 plugs Continued page 150 MFG OF NISTAETER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 1 glow plugs model cars boats air planes using glow fuel engines TORK STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies pow dolag comes new C/b charger has LED indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along pre-payment receive free shipping handlino YORK-STARTER $2995 Charger 11 OV 220V 1 2V Fast Charter $2095 Without Charger CHARGERS $1295 Charger Only Ii 1OV 220V 12V Fast Charger 301 464-2260 148 Model Aviation ProTechTor STRONG METAL FRAME THERMO MOLDED SHELL FILLED WITH SOFT FOAM GREAT GIFT 951255 RC AIRPLANES BOATS CARS CAMERAS ETC Transmitter Case PRICE $35 Includes shipping Con USA Alaska & Hawaii add $2 CA Res add 6% tax OTHER PRODUCTS COMPUTER DISK CASE LOMAR CLAMP building tool PROMOUNT machined engine mounts MC SASE FOR FREE INFODEALEARS INVITED BERGERON ENTERPRISES 443 ROBERTA LLERTON CA 92632 12421 Ransom Dr. Glenn Dale MD 20769 L have proven extremely durable high-rpm situations TP/TPM 4 exhaust duration should creased fully accommodate super charging effect TP/TPM prac tical limit about 1800 after engine becomes peaky very hard set Changing exhaust timing involves some skilled machine work best left true engine experts An easier method replace stock sleeve pipe-timed sleeve K&B 65 frontrotor engine has about 1500 exhaust duration Its performance TP/TPM can increased substituting sleeve F-i version 1600 exhaust duration Some K&B Formula fliers may have couple piston/sleeve assemblies no longer competitive F-l due loose fit ideal replacements 65 front-rotor ver sion operated 15% nitro TP/TPM unlimited Pylon Racing K&B has performance update package 75 ducted fan engine package includes special sleeve 1800 exhaust dura tion eyebrow porting update also dispenses Perry pump carburetor sometimes gives reliabil ity problems field use abuse Some combinations OPS OS ST engines may yield similar results substitution pipe-timed sleeve Check importer Included segment article drawing several TP/TPMs available MACS Products presented give reader general idea dimen sions weights selecting TP/ TPM particular application next installment will discuss some newer performance-added silencers such Magic Muffler Wizzard V-Tech mufflers See next month Bill Hager 706 Glen Haven Dr Conroe TX 77385 responding advertisers mention read about ModelAviation TARBabyITRANSMITTER CASE Especially Turn-around thisAn inexpensive rugged molded 850 sq 120 4 cyclecase protect thst expensive -rpowered Ron Chidgey designtransmitter both two stick smooth solid performersingle stick transmitters Brown Rib templates computerleather grain aluminum trim plotted Plans construc-and locking clasp -$1895 tion hints -$1195 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-in wing mounting system developed Ron Chidgey s Included pair fast neat accurate stays tight Three special slip-tit phenolic sockets nylon brackets screws snd machined wing blocks build wing structure included $695 Now a size models 718 dia 2 $ 895 1 dies 2-$ 995 1a diax3-$1495 GIGator RIC Products P3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514 Phone AC 904 476-8639Include $150 Per Item UPS Spoilers/Winter Continued page 64 own moment truth Any accom plished aerobatics pilot can relate experiences good test pilots medium-level sport pilots like own capabilities safe altitude could engage spoiler positions Fig 2 including overkill full-open devisedjust test purposes landing pattern especially final approach simul taneously retract spoilers apply emer gency power take off up-trim later ignored trim depended stick use back-stick properly fly plane tense moment wind clearly too risky low altitude whenever exceeded two first-open positions could safely land go-round spoilers out positions first-open position fed downwind perfect Whereas plane spoilers hard get down wanted consistency problem vanished first-open spoil er position setting could stand throughout approach final though landings aborted landings go-rounds touch-and-go After hoped very high approaches second-open position caused ship sink rapidly enough attain proper altitude point spoiler positions shown Fig 2 subsequent modified positionsrec ommendedare shown Fig 3 Establishing spoiler position well back downwind leg easy changing spoiler position later landing pattern was too easy get say position No 3 rather No2 Thats smaller final spoilers operate open shut proper technique re quires smooth elevator compensation pitch-down larger openings greater sink acquired al lowing dive develop maximum spoiler openings proved dif ficult first oversized spoilers too much think about late final dexterous pilot multi posi tions available may desirable 150 Model Aviation 049 Engines Suitable 2-4 classic its kind An agile odel really performs excellent piantorm durable and enloyable ship fly RIG contest enents Wean gal avirale line 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