3QiXL Racing EJBiII Lee IN MY LAST COLUMN copied first part article has appeared Gazette FAI Control Line So ciety newsletter article Flying Tac tics flying Rules Race Performance just example should join group will need refer June column reading what follows Fig 6 June can see normal flying position somewhere tween point point 4 flier losing little speed compared what could flying pylon make up speed lost flying larger radi us pylon pilot must lead plane As can visualized Figs 5 6 position 5 flying isnt whipping much requires peculiar crab-like walk pilots looking over shoulder Getting other side center rotation over towards position 2 really helps lot want excellent exam ple something close position see picture Peterson Denmark way 3567 time page 584 October 1976 Aeromnodeller Its worth 1000 extra rpm Just watch Dougy Harris fly Goodyear meetWRL might argue rule book outlaws po sition 2 jury has call Re member written FAI TR WRL first part article flying alone steady-state conditions dis cussed end flying alone section will consider unsteady effects namely ac celeration wind change flying radius Center rotati pull-ups high flying Wind has effect speed does ac celeration deceleration world class racer used previous examples 1-lb weight 4 thrust hp 100 mph flown pylon assuming racer ac celerates its terminal velocity ing flown pylon takes about 7 seconds go 90 95 7 seconds go 95 975 other words near terminal velocity takes 7 seconds get halfway steady-state speed whatever speed start goes whether youre speeding up slowing down Now course slow creep up racing speed good pilots will give little tug pull flying radius right end hurry up process flying speed dis turbed race always takes time build back up again reason avoid sharp pull-ups will drag speed down Wind generally has small doses lit tle effect average speed plane flies dead wind airspeed higher normal inertia still carry ing its ground speed low Around 1 FIGURE 8 Lift vs Flying Height 18 degrees after coming full wind airplane going slowest terms ground speed 180 degrees around fastest See Fig 7 herewith Wind does however offer good oppor tunity make whipping effective ground speed highest line tension highest whip ping effective best place fore around either side 18 degrees downwind position pass should made Going wind time shorten flying radius Speed line tension low whip ping isnt effective no can get away leading airplane around over whole lap anyway foregoing suggests pattern seen occasionally pilot especially two-up situa tion flies position 2 apparently way behind plane going like stink Just fore plane has wind square its tail pilot starts pass raising hand over head pivoting left right foot taking few back ward steps completing pass time plane going like bomb Continued page 81 100 mph FAI racer 4 HP Effect Wind lift centrifugal force 1 45 -i-tO-- liftline 100 mph t@nsion.-. 125 ge gsheight- ftmeters 656 S4 30 1969 60 centrifugal force weight lift 5 23 44 \t-fteotest GroundupeedCONDITIONS 16 OZ 90 s.- Lowest Groundspeed 18 FIGURE 7 36 Model Aviation secure tank rather epoxy suggested instructions full tank fuel weighs almost much engine could easily work loose after few flights ground pounding Besides safety factor will disqualified part plane comes off during flight know person disqualified engine spit out crankhe also writes poems Cox 15 hasnt exactly set world fire FAI combat runs well does G-15 Tigre weighs less re stricted enough pull through maneuvers hold consistent needle settings Rossi 15 far above G-15 G-20 Tigre probably wont make difference Team Trials because people will flying usual Fast Com bat style 15-sized airplanes em phasis wont consistency good pitting good wild matches Ive using Tigre X-15 lately place Rossi have pretty good results though weighs /2 ounce like Cox motor sensitive being over-lean much other high performance engines just slows down has never come near seiz ure Fiberglass props necessity high-revving motors 7-4 nylon used G-15s up task Some new wood Quarter Midget props good too Ive using props designed AMA Goodyears available several different manu facturers tend have bit too much pitch since top-end important acceleration Try keep full 7-in diameter pos sible keep revs up de-pitching tips prop wider blade props will give better feel model super narrow speed types larger di ameter wide blade will give zip climbing during consecutive ma neuvers extra diameter helps bit cutting streamer think youve got perfect setup try some Wil kens Wiggles see motor main tains revs plane speed stays up check well stays lines MACA will running US Team Trials over Joly 4th weekend Due lead time magazine may read until just before contest Im told additional fee may enter late site St Louis Addition al manpower needed help run con test either case might contact MACA president Gary Frost 22 Glynn Dr Florissant MO 63031 last column mentioned some neat bearings available new Fox know few disappointed because didnt fit crankshaft inside diam eter bearings same diameter crank isnt need polish bit off crank until bearing nice fingers push-fit crank Some people tried freezing crank heating bearing brute force repeat crank must fitted bearing dont accomplish thing way Rich Brasher has couple cranks left original batch 100 gone will no Write Rich 327 Howland Redwood City CA Charlie Johnson 3716 Ingraham St San Diego CA 92109telephone 714 273-6530 CL Racing/Lee continued page 36 about 5 10 mph over speed whip ping Joe Turkey just passed fly ing position 4 losing 5 mph hes wondering hot dogs 10-15 mph speed advantage came About now faster plane coming wind jury scowling thinking calling foul pilot stops whip turns around starts flying lines off left shoulder again two laps will ready another pass rate foregoing discussion briefly touched effects acceleration wind next last effect consid ered yo-yo Since angular momen August 1977 81 1111 P R 0 D U CT S N C SVILLE ROAD OW GROVE PA 19090 6593900 NOW. THE SUPER POWER TEAM Could Start Something Big SUPER/GEL. EXPRESSLY FOR MODEL USE Say goodby batteries really designed something else No need make anymore Super/Gel Fast Charge & Discharge Needed Models Sealed-In Gel No water no spiii no leak Full 45 amp hours between recharges Long Life Recharge 500 TImes SULLIVAN CHARGER . GREAT TEAMMATE UL Listed Plugs OrdInary House Current Fully Charges Battery 12 Hours 500 ma Output Ideal New Battery Can Used Most Wet Cell Batteries Too FOR THE NEW GOLDEN AGE SPORTSMAN PILOT popular demand new 2% foot scale pilot larger models May easily painted suit particular requirements Other styles sizes including 1 11/2 2 scale also available GOLDEN AGE WHEELS NEW 1920s 1930s air craft models Featured flexible semi-pneumatic tires paintable wheels Ten sizes 3h through 5 diameter Vintage smooth contour styles also available SEND 50 FOR COMPLETE CATALOG DEPT MA PAWNEE ST SAN MARCOS CA 9 laosturn conserved flying radius shortened very rapidly speed has go up time per lap goes down faster speed increase would indi cate flying radius also shortened course speed immediately begins die down steady-state speed second helps possibly just enough make pass instantaneous appar ent speed goes up square ratio old new flying radii After takeoff example pilot spirals inward toward center effect really helps example racer doing 90-mph airspeed 55-ft flying radius ap parent speed 854 mph suddenly pull ing radius 53 ft jumps about 920 biggest increase speed airplane going fast spiraling center should done right after takeoff Probably best place right end first lap pilot taking advantage hand off chest two laps after takeoff rule Another way effect used arm could extended during pass After drawing oppon ent pilot would pull arm take step backward help things along same phenomenon used Sunday flying great effect doing loops downwind After engine quits pilot can whip pull bottom loop coast up top putting enough energy keep plane flying long periods discussion date enough attention has paid subject load put engine setting mechanic has tuned engine run its best given speed load pilot changes conditions setting best things can get worse rapidly Flying positions 1 2 does change load engine per ceptably though slight change line drag Leading plane coming wind having fly ing radius reduced suddenly unload engine reverse loads up addi tion causes increasing G-load ing plane will increase its drag also load up engine light airplanes loading-up effects minimized high aspect ratios em ployed team racers helps reduce drag increase effects Now G-loading effects will touched moment worst ef fect pilot lagging plane perhaps because being stuck behind skillful slower opponent perhaps because inexperience lack knowledge continual lap after lap running lower airspeed leads overheating engine doesnt cook up stop may restart easily airplane will eventually slow down lose its speed advantage thus nullifying superior air plane way fight back lead plane run risk being fouled out adjust engine before race loaded-up condition requires richer under-compressed setting give up laps speed add fact common mistake tune airplane run best leading product review product review product review -3 Large Size Fuel Fitting Set Following introduction 1/16 lD Fuel Fittings large size fittings double flow rate bore size 3/32 Set includes el bow tee union plug Molded light weight fuel-proof polyethylene Price per set four $150 Fourmost Racing Products 4040 24th Ave Forest Grove OR 97116 product review product review product review lagging less normal flying circum stances will permit 1970s recognized mistake though doesnt make good practice times made nearly often previ ous decade As can see pilot must make effort pass first oppor tunity will unload engine cool down importantly establish jurys mind superior speed right pass italic mineWRL pilot gets blocked five laps desperation decides tow little pass jury will think plane matched speed applying physical effort pass could fairly Returning effect G-loading note high flying demands far lift wings just weight airplane Continuous high flying requires wing lift support some centrifu gal force see Fig 8 Assuming 100mph pylon speed racer handle circ ling one-ft radius circle about center rotation center spot FAI Sporting Code calls following cal culations should illustrate problem Handle against chest held 450 ft above ground level airplane flown con tinuously minimum/maximum nor mal flying height 656 ft/984 ft wing lift must 15/23 times weight Only plane could flown 45 ft altitude would lift equal weight against rules Handle above head 600 ft above ground level airplane flying maximum height permitted during passes 1969 ft lift must 441 times weight Very few people realize flying constant altitude like put such load plane-no wonder wings flex additional lift will certainly reduce airspeed aircraft since drag must higher However since flying radius shortened effective speed timed speed may go down high aspect ratio racers just op posite may occur high flying may pay off can get away Flying within rules however constant three meters altitude compared 82 Model Aviation two meters shortens radius less one-tenth percent creased load pulling continuous 23 Gs can hardly worth best posi tion down low Few juries foul pilots flying below two-meter limit its done time encourages lot real low flying Normal flying isnt problem question passing passing two time instancehow high should fly best solution time few laps flying high six ters speed timed increasing consider using maximum height allowed during pass reduces radius about 35 percent Also dive down normal height lower after pass will help gain speed passing fastest people continued W R Lee 3522 Tamarisk Lane Mis souri City TX 77459 CL Aerobatics/Paul continued page 37 position usually easier move engine down try move tank up Les McDonald suggests installing spray bar 5A mounts one-inch-thick tank should give leaner run inverted However Al Rabe argued AAM moving spray bar 46 did change run Well try both ways self see what works think Al may have valid point hypo thesis height spray bar counts height fuel pickup tube mass fuel-head location relation engine Al presently concerned internal vol ume engine crankcase dis tribution crankcase volume stating volumes may cause difficulties crude yet usually effective fuel de livery systems agree wonder can get such sophisticated engine runs through complicated series maneuvers amazingly simple fuel tank sys tems commonly use Al tried Perry pump big honker ST 60s feels necessary ST 46 35-size engines certain keep plumbing pickup tube spray bar good straight line no large bends kinks upand-down routing over-and-under rout ing Another point remember ad justing tank engine etc careful about fuel tubing Whenever check tank remove tubing spray bar tank always put n new clean tubing after carefully wiping off spray bar nipple fuel pickup tube Ten cents worth tubing better losing ten-month construction project Use small fuel filter such HiJohnson filter large filter can allow air accumulate filter itself can cause cutting out Try different filter sizes think may problem Make certaii pickup tube goes way very back end fuel tank soldered outside wall two places Cut 45-degree bevel end pickup tube sol dered tank Make certain tank clean inside airtight Dont let tank vibrate forced build own tank since manufacturers coming up essential itemthere couple very good articles lately tank building especially Dave Rees FM Jan 77 p 42 Harry Higley some good pointers construction MAN July 75 whole column de voted tanks MA Jan 76 Use 008 K&S solderable tin Werwage Higley Rabe Paul etc 006 Rees Dont use brass shim stock tank will come out weighing 25 oz Use 60 tin-40 lead 50- 50 solid solder Use flux such Kester Nokorode La-Co use silver solder will corrode terribly dont need type strength certain use 125-in OD soft brass copper tubing Dont use hard brass Higley sells very handy tubing bender $125 works Bisco bender available Harry 433 Arquilla Glenwood IL 60425 Just review classic fuel tank Veco configuration has August1977 83 UNBELIEVABLE HORSEPOWER 65 cc K & B 65cc 40 RIC Front Rotor CONSTANT FUEL PRESSURE Regardless Position TheK&B 61R/C Perry Pump/Regulator Fuel drawn fed large bore Perry carburetor through pressure supplied regulated pump unit increases hpto equal surpass 61 engines made today Additionally advanced step model engine fuel systems permits fly ing position fade out . placement fuel tank no longer critical K & B 61R/C Muffler Same engine above Perry Pump/Regulator KE MANUFACTURING DIVISION OF AURORA PRODUCTS CORP 12152 WOODRUFF AVE DOWNEY CA 90241
