Control Line: Speed

Control Line SPEED Gene Hem pel 1zP 83 ILl 74 Model Aviation GO FAST part II column con tinuation the February 1984 issue Nick Sher describing rework needed set up Supertigre X-29 suction fuel feed hope time read previously described engine rework finished Engine modifications continued venturi next part requires careful attention Disassemble needle valve sembly venturi Set needle valve assembly aside later use Machine venturi type aluminum mate rial prefer 2024-T6 fit venturi open ing backplate Drill 5/16-in hole through venturi hole dimension has found best-suited good suc tion X-29 engine sure smooth out airflow passage venturi u-ti Next work needle valve assembly needle valve upright member made OPS P&G Metal Products Part No 433 needle valve housing Rossi embly two soldered together Check very carefully no solder block ing fuel passage Check photo clarification assembly Thread com pleted assembly venturi upright member takes up venturi diameter Epoxy assembly venturi An 0ring employed prevent air leaks tween venturi backplate needle valve stock Tigre 29 next operation will machine tuned-pipe header Use dimensions drawing header Any type alu minum material can used header designed use Rossi 29 pipe Test bench operation first thing mix some fuel following formula 78% nitro 20% oil UCON 2270 2% meth anol engine requires little no breakin 78% nitro 7-1O/2 Rev-Up prop open exhaust 200 engine will turn 19500 20000 rpm get balance prop spinner Place engine plastic bag set aside completes engine modification instructions Next lets talk about suction tanks B Speed suction tank B Speed has blessing compared pen bladders C Item above exhaust header Rossl 29 pipe Below plan very successful B Speed suction-feed tank Hits Make tank past using pen bladders piped engines flier would lucky get run per engine comeback tank sys tem has made B Speed fun fly once Study drawing construction tank very carefully vary drawing tank system works excep tionally well designed building tank sure radius bends tubing eliminate flat spots kinks means Keep cotton-pickin pliers off tubing Check drawing feed tube position feed tube should sol dered approximately 100 angle up horizontal Also sure feed tube points straight spray bar elbow may have resolder position elbow match up feed tube tank finished clean inside tank lacquer thinner forget pressure check tank potential leaks next operation fit tank pan Use some type hand grinder mill remove unnecessary metal pan placement fuel tank Take special care tank will mount level straight Check height tank does interfere models control system Clean pan thoroughly soap water rinse lacquer thinner alcohol displace moisture will necessary time mount engine pan check placement tank cutout needle Check photo detail Use clear silicon adhesive mount tank pan close engine carburetor possible Allow sembly dry thoroughly 24 hours Mount engine-pan assembly model check clearance ram tube distance ram tube fuselage side should approximately 550 Drill tap left side pan 4-40 bolt Check placement bolt photo placement crit ical bolt place bend 900 ward very carefully intended used cap overflow tube may necessary flow some solder over threads prevent bolt breaking Next drill V4-in hole front engine cowl left side just above spinner air-cooling vent required Mount tuned pipe model set 13 center plug edge pipe now ready test-run engine model fill tank remove tubing overflow cap bolt Hold nose model straight up fill through ram tube Allow fuel flow through over flow tube Slip tubing back over screw cap side pan fuel bulb still ram tube hold model nose-down give small squeeze force some fuel venturi prime engine Mount 7 X 101/2 Rev-Up prop engine Open needle valve 61/2 turns its seat Using electric starter hold nose model down about 30 engine starts hold model level engine should run rich Allow run few seconds tilt nose upward engine rpm should increase dramatically indicates engine has come pipe does come pipe set too rich Shut off engine putting finger over end tuned pipe Dont worry wont burn finger Close needle valve Refuel again re peat procedure until engine does come pipe nose up falls back slightly rich placed back level position may have repeat pro cedure until achieve desired setting take time desired needle setting now ready first test flight Fuel tank prime engine start engine holding nose-down launch quickly possible allow en gine go lean burn out prime model still dolly model must roll lift out dolly 3A first lap model stays dolly longer make necessary adjustment correct problem very important Get model out fast possible glow plug will blow element plane still dolly first flight needle setting flight will rich Turn needle -turn crements between test flights until achieve right setting Make further Continued page 164 April 1984 75 T 9 Above see composite needle valve/spraybar assembly L assembly mounted new venturi C Nick Sher has info items column right tank mounted pan use silicone sealerand make sure tank level straight Note has considerable metal-grinding front pan Below engine has mounted pan Look carefully various tubes aligned 4-40 bolt used built-In cap till tube venturi same shown February Hi Im ART GROSS know some have wondering WHAT IN HELL IS WEDGE LOCK Well will tell hand sanding block made out HIGH IMPACT STYREMEIF IT EVER BREAKS WE WILL REPLACE IT FREE uses belts same size 3x18 Electric Hand Sanders might ask WHY use expensive belts instead using cheaper sandpaper block sanding WHY BECAUSE BELTS ARE MORE DEPENDABLE ECONOMICAL DURABLE AND EASIER TO USE glueing tacking clamping pieces sandpaper other block BELT WILL NOT SLIP WRINKLE OR TEAR CAUSING THE MARKING AND GOUGING OF YOUR FINISHED WORK 1-RESIN BONDED BELT WILL GIVE YOU AT LESS COST MORE TROUBLE FREE SANDING THAN 10 sheets regular sandpaper sandpaper sanding block can waste up 440/0 its sandpaper just fasten itself block BELTS ARE EASILY CHANGED THEY ARE PUT ON AND TAKEN OFF BLOCK WITHOUT DAMAGE SO THEY ARE REUSABLE FOR MANY JOBS SINCE THE BELT IS SO EASILY CHANGED IN SECONDS YOU PICK THE RIGHT BELT TYPE & GRIT SIZE TO MAKE YOUR SANDING JOB EASIER WE THINK THE WEDGE LOCK SANDING BLOCK IS THE BEST YOU CAN BUY BUT WE ALSO KNOW SINCE YOU HAVE NOT USED ONE YOU MIGHT NOT AGREE WE WILL PUT OUR MONEY WHERE OUR MOUTH IS GET ONE AND USE IT AND THEN IF YOU DO NOT AGREE WITH US AND WANT YOUR MONEY BACK WE WILL BE HAPPY TO GIVE IT BACK TO YOU MODELERS ASK YOUR HOBBY SHOP FOR WEDGE LOCK HOBBY SHOP DEALERS ASK YOUR DISTRIBUTORS FOR IT DISTR ART GROSS ENTERPRISES 206 743-9332 $1000 COUPON SPECIAL $1000 Please fill out coupon mailing label circle 3 extra RESIN BONDED BELTS want will send prepaid 1-WEDGE LOCK SANDING BLOCK comes 80 grit cloth belt & 3 RESIN BONDED REPLACEMENT BELTS THIS IS $1400 value $1000 BLOCK -$600 s @ 0200 -- postageS haedlirsg $1400 $1000 COUPON SPECIAL $1000 BELTS ALUMINUM OXIDE 80-100-1 20-1 50-1 80-220 SILCON CARBIDE 220-280-360-400 FROM ART GROSS ENTERPRISES206 743-9332 12516 MAPLEWOOD AVE EDMONDS WA 98020 touch-and-go taxi engine shutoff bomb tank drop flaps Flight QualificationsModel must come airborne within three minutes start prop flipping Three attempts will given make two official flights An ad ditional minute starting time will allowed additional engine bonus 10 points will given getting air borne minute single-engine mod els within two minutes twin-engine models additional minute allowed additional engine multi-engine models will receive extra 10 points engines remain running through 10 qual ifying laps Maximum score can achieved static flight would 250 Flying Line Safety Requirements same listed AMA rule book scale models weighing up 8 lb George Bill go say reason came up own set rules profile event twofold GSCBs multi-interest CL club heavy terest Stunt sport flying Scale Carrier run close second Scale mod elers club thought type event would make good starting point modelers interested Scale and/or Stunt hesitant construct full-bodied model time As can see GSCB rules thing quite simple point Items such I-in-thick-maximum fuselage up 10 flying options would satisfy sport competitive fliers regardless primary CL interest bonus multi-engine fanatic will also note static judging distance 10 ft felt greater viewing distance would less effective judg ing standpoint because general size available profile models speaking availability pro file models small list readily available several manufac turers MidwestP -40 erschmitt Aira cobra SterlingYAK-9 P-38 P-5l GoldbergP-40 Buster Cosmic Wind Shoestring cant find model build among available might time try efforts designing building own Profile George Bill conclude thoughts Profile Scale hope GSCB event will interest other clubs will some small way help promote Scale activity 1984 event held first time GSCBs annual Teterboro NJ Scale Model Flying Show last September 1983 See accompanying photos some models entered new event Now building season winter months has underway some time parts country Scale builders should have new supply ideas tips perhaps some photos new proj ects would great would share fellow CL Scale modelers Send items Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Speed/Hempel Continued paqe 75 needle adjustments b-turn increments important single thing pilot will need master capability finetune engine flight very simple model flying level approximately three four ft altitude engine run ning slightly rich maneuver model up about 15 ft will cause engine lean out After about 11/2 2 laps bring model back down level flight en gine tends go rich again turn needle shut /o-turn before next flight Repeat procedure until engine holds con stant setting level flight Closing comments No sets speed mark solely himself requires tal ents assistance people am fortunate have endowed friendship expertise such people Frank Garzon Les Baer Gene Hempel fabulous pilot George Brown others have helped make happen Service materials Piston Blanks Performance Model Parts Inc 12233 South 1565 East Draper UT 84020 G Dye Pis ton MachiningPrecision Metal & Grind ing RD #2 Box 54-A Minesite Rd Allen town PA 18103 L Baer Chrome Plat ing Honing OPS Engine PartsP&G Metal Shop 301 North Yale Dr Garland TX 75047 G Hempel During 1983 contest season using setup Nick Sher placed first 83 Nats 20435 mph first Dayton OH Cold Cash Speed Bash September 10-11 20816 mpha new AMA National Record hope series engine tuning tanks etc will encourage modelers compete Speed events real challenge require lots experimentation success comes mastery small skills Gene Hempel 301 N Yale Dr Garland IX 75047 CL Racing/Ballard Continued page 76 momented models first re luctance use shorter-nose models cause problem getting large enough fuel tank between engine wing leading edge As time went Veco came out profile tank series improved situation addition Veco profile tanks larger mount ing area typical rectangular wedge tanks consequently tank vibrated foamed less mounted profile fuselage 164 Model Aviation 0600 GOOD VALUE LOMES WITH 80 GRIT CLOTH SANDING BELT THE SANDING BLOCK THAT WEARS BELT