George hi Aldrich 12822 Tarrytown San Antonio TX 78233 SEVERAL MONTHS ago sort redefined wording used engine books describe misfiring engines Years ago first started study two-cycle design use term detonation early firing engine bothered Such phrases firing valves partially open dont really describe two-cycle Since word detonation means explode topic under discussion firing too soon use pre-detonation pre-ignition According engineering texts disagree person wrote about technically correct purposes however phrase pre-detonation pre-ignition descriptive Perhaps English teacher among readers will enlighten us regard term grammatically correct believe Churchill said England America bound together uncommon language leading up discussion about couple ways set up Stunt engine am assuming engine under discussion designed provide type performance want Stuntie low blow-down timing etc delivering maximum hp/torque output lower rpm range such engines made countries use nitromethane fuel get power non-nitro fuels engines usually have wide-squish-band small-chambered high-compression-head designs sort setup coupled rather small venturi opening usually produces adequate power engine runaway Using nitro fuels may require adding head shims aid stopping pre-ignition cackle Because various climatic conditions can also adversely affect high-compression arrangement some adjustment will required weather varies Such engine will also run very hard because its higher compression ratio same engine can set up give adequate power running easier steadier addition will less likely suffer intolerable runaway try avoid Narrowing squish band something like 070-080 enlarges combustion chamber reduces compression ratio will steady rundown also make engine less sensitive needle valve settings fuel weather changes regain power lost reducing compression 22 Model Aviation Two Noblers 1957 AMA Nationals black model won Walker trophy El Diablo Frank McMillan Reinhart design flown Old-Timer Stunt VSC Ill Tucson Woolsey photo Sheik Jack Sheeks fine modeler/ designer builder unknown plane gorgeous Woolsey photo original Flite Streak first flown January 1957 plane went kit Bob Gialdini stretched 58 Olympic builder Chris McMillin Woolsey photo modification venturi opening can increased until necessary power obtained little simple math can used determine area venturi bore allow adjustment/tuning optimum dimension engines set up manner will four-cycle through whole pattern plenty steady power An engine breaks two-cycle mode wrong moment can cause rounds look like eggs etc Several recent conversations have made aware common misconception about chrome-plated cylinders engines people seem think chrome will run cooler because hard slick opposite true chromed cylinder set up same tolerances plain liner will run hotter old days McCoy 60 issued 0035-in piston clearance Chroming cylinder keeping same tolerances would guarantee 1500-rpm loss increasing piston clearance 0045 can achieve power new engine maintain power much longer life span Todays metallurgy its high-silicon alloys has allowed Continued page 58 July1992 23 John Robards Vintage weekend uia first Walker Trophy Flyoff contested left right Bob Winks Art Pawloski Warden 1989 Johns Tyro Trainer took George Aldrich 1957 AMA/Navy Nationals Fireball Trophy Prentice photo Frank McMillan took second Senior Stunt 1957 AMA/Navy Nationals original Gambler design first Nobler built kit parts shown framed up December 1956 George Aldrich pictured completed Nobler model before sending to Top Flite kit photos view inside Moki 6-5 FV engine Note innovative port fluted shaft Moki 15 bottom shares feature nese uIree Aiwood Glow Super Champs recently restored noted designer/flier Don Still PENETRATE THE SKY Lanier RCs DART GOOD FLYING SPORT AEROBATIC MODEL ITS ARF THATS MADE IN THE USA Wing Span 63 Area 630 sq Radio Channels 4 Fuselage Length 42 Rec Engine Size 40-60 4 Stroke 80-90 Flying Weight 6 lbs Send SASE free color catalog Phone 404-532-6401 900 530 EST M-F Lanier RC PO Box 458 Oakwood GA 30566 FAX 404-532-2163 Flying way meant thats beauty Control Line Planes want experience flying way meant way American pioneers like Charles Lindbergh flew FEEL airplane Control Line Planes has worlds largest selection control-line planes equipment including hard-to-find classics w- Write today catalogue - We guarantee prices complete No hidden charges w- We pay shipping ship immediately $300 catalogue charge refundable first order $20 100 PARK AVENUE CARMICHAELS PA 15320 NEW RELEASE NOSTALGIC STUNT ORIENTAL Wing Span 55 Engine Size 35-40 *6295 58 Model Aviation Up Around/Aldrich Continued page 23 manufacturers close up clearances ringed 60 will now come little 0020-in piston-to-cylinder clearanceunchromed Chrome it should become 001 larger course speaking ringed engines same thing applies ring-end gap standard setup ring-end gap should no less 003 setting ring tight will require very slow careful break-in first hour operation Chrome liner clearance should become least 006 same careful running first Failure open end gap will result ends chopping ports actually breaking ring groove So much happened late 1956-1957 period hard remember proper sequence events August 1956 well doing complete drawings Nobler kit Top Rite As layout draftsman drew day came home drew until midnight night kit produced exactly drawn designer late September just finishing final die layouts Carl Wheeley called AMA real SOS call Carl needed someone clean up CL Precision Aerobatics rules publication December Citing heavy work load declined Well two calls later Carl still no relented next two nights went wee hours first night took out loophole replaced should will could shall second night set maneuvers sequence still use today Three glaring errors neglected no video cameras days square corner radii left unchanged hourglass impossible perform written probably still wrote scoring 0-40 points 10-40 points printed reasoning today judge should able award little point minimal attempt made perform maneuver well play topic some other time December first kit die cuttings arrived display model built immediately sent off Chicago photographs Sid Axelrod called ask whether something else could kit Well Sid about simple model compete Ringmaster business Sid said Have Thus first Flite Streak flown January 1957 Since plane bit nose-heavy went home moved wing forward inch began new Continued page 60 EASY Satisfaction Guaranteedi SH-710 Pkg 24- $295 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply s few drops favorite GA glue youre done SUPER FAST SUPER EASY SUPER STRONG SIG MFG CO INC.4017 So Front St.Monfezuma IA 50171 6235154 PLANS NOW AVAILABLE Easy-to-build WORLD WAR SPAD end RED BARON Pedal Planes littie pilot age 3 6 ilI love Use unique exciting toyl Plefle complete iSis fiji-size patterns 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built kit parts changes made light blocks carved hollowed used replace top bottom sheeting May June practice time schedule follows Get home 530 load car head park flying field Try 10 flights before dark Picnic suppers dusk Weekends shoot 50 flights day sometimes settle 40 Go sleep doing pattern mind Modelers sometimes tend little crazy July amved Willow Grove NAS good ol Philly What else go practiceby time robot anyway After lick-and-a-promise win 19561 would prepared About midmorning received word Nationals director Maurice Teter wanted talk wanted know anything could suggest running Stunt event Thinking back 1952 fliers flew front same judges same day 1956 didnt can guess suggestion Maurice said cant have too Junior Senior Open initial discussion came first Walker trophy flyoff Since Open event Friday decided winner age group would fly Saturday morning decide National Stunt Champion During entire week burnt gallon Fox Superfuel day night Sid would come fresh gallon torn between two ships black-trimmed red model grooved better landing panic situation gold white red ship flew reasonably well landings unbelievable could bring slow flare bit wheels would just start rolling night Rollie McDonalds motel room decided black Nobler Rollie experienced motor run problems day repaired canopy model built tank model During week Pete Peters brought Navy officer judges out watch various practice flights trained days suggested walk out circle see pattern pilots view proved revelation seemed understand much better after just flight Continued page 70 60 Model Aviation Conso-ucsaon materials Wo.. .l available lumbar hardware outlete Some parte available ready-made desired Ust indudad plans Plans $1495 Ha ILlS dal Specify plans desired FL Res add 8% tex Add $300 P & I-I FANTASY TOYS aaG rines Blvd Suite 188 Pembroke Pines H 143e-S196 George Marsden 7621 Mary Cassatt Dr Potomac MD 20854 BIG GLOW FUEL MANUFACTURED WITh THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters 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U] 70 Model Aviation Up AroundlAldrich Continued page 60 Open Stunt day proved unlike others subsequent years circle considerably higher scoring other days best single flight won youd better blow high circle hard work paid off however scored highest both circles say truth young senior contestant named Frank McMillan came out practice day critiqued other week helped lot shaping new hourglass maneuver Gerald Wagner placing close second scored 610 points 618 Gerry flew modified Chief called Black Midnight Torp 35 up front havent heard Gerry years someone knows tell him come back fly Nostalgia us miss him Rolland McDonald solid third big Strathmore Frank went place just behind Senior winner Art Pawloski Art flew own Detroiter-influenced Atom design Frank original Gambler later published Model Airplane News Bob Winks topped Junior event flying modified Palmer Thunderbird arrived Stunt circles Saturday morning misting rain As remember Art Pawloski first up rain increased during first flight About thing recall other winning second Walker trophy using finger windshield wiper clear water glasses decision fly black Nobler proved correctit fated Sunday flying demonstration before thousands spectators bellcrank other model came loose smashed concrete write want reply please enclose SASE done will always answer will accept phone calls please dont call writing will suffice have business run address 12822 Tarrytown San Antonio Texas 78233 Phone 512 656-2021 fax answers after six rings Svetlanas ROlFilipova Continued page 28 adversarys model too often its airplanes wing prop touches opponents streamer Think much harder must try cut opponents streamer keeping eyes two models once RC Combat guys say can done certainly cant easy hope some will consider building simple RC model never try out RC Combat know youll find just plain fun fly * U U U U U U U I I I U U U U I I U I I SIG MANUFACTURING CO now imports complete line world record holding ROSSI aircraft marine helicopter race car engines includes full line parts accessories plus full time ROSSI REPAIR CENTER US SIG-imported ROSSI engines come full 90 day SIG WARRANTY against work manship manufacturing defects SIG MANUFACTURING CO INC . 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