Radio Control: Soaring

3 Soaring Pruss SAD NOTE After seven consecutive years hosting Soaring Nationals SOAR Silent Order Aeromodeling Radio announced will holding event 1977 past event always preregistered contest must proper management Last yearfor first timecontestants turned away because frequency satura tion Also first time frequen cies filled first day preregis tration switch over 27 MHz 72 MHz fliers preregistration situation becomes critical brings up point. Up until couple years ago tab citizen band FCC license 20 dollars get around high cost individ uals flew under club license too cost 20 dollars covered club mem bership type arrangement can pretty well guess FCC didnt have accurate count indica tion what kind interest existed RC modeling Recently fee license eliminated Thats right have fill out license form send FCC Now clubs license get membership apply individuals perhaps FCC would get accurate count RCers num bers mean anything did CBers perhaps new frequencies would come way event applied individuals would give AMAs Fre quency Committee little ammuni tion Back SOAR Nationals SOAR wishes pointed out intention study possibilities Nationals 1978 frequen cies arent available alleviate present situation other avenues might considered among invitational Masters type tournament entry earned performance 1977 Happy Note past seven years LSF Tournament held California Although contests have open LSF member contests limited maximum entry based workable number per frequency Membership February 1 2285 restrict contest past means about five percent total mem bership could participate plans 1977 Ten LSF Tournaments will held same week-endthats two-day con test August 27 28 traditionally week-end past LSF Tournaments Sites chosen include two California Los Angeles area San Francisco area state Washing ton also will site along Denver Dallas Chicago Michigan York PA Alabama Florida Details will announced mem bership plans include preregistration sites vacation plans can possibly coordinated tournaments Competition will include awards Standard Unlimited size sailplanes Stand-off Scale Best technical achieve ment will also recognized Awards will made sites estimated Tournament 77 could bring out 700 contestants Glide Ratio vs LID often have approached someone first exposure RC sailplanes inevitably results question Whats its glide ratio answer 101 151 whatever posed question usually satisfied that particular sail plane will lose foot altitude 15 feet forward flight 151 answer given Yet doesnt accurately define sailplanes performance Let us moment categorize sailplanes two classesfloaters good L/D ships floater let us use plane wing loading 6 oz/sq ft L/D ship again Nelson KA-6 sported 24 ounce loading see Model Aviation March 1977 glide ratio planes approximately 101 301 respectively Glide ratio can defined distance covered respect altitude lost what about speed important penetration Thats L/D spoken L over D accurately describes perfor mance L/D ratio numerically same glide ratio varies forward speed Now let us picture test glide both planes Suppose planes could tossed shoulder height simultaneously test glide Let us further suppose both planes display prescibed glide ratios both land same time both landed same time safe say sink rates same purpose discussion let us say sink rates two feet per second stage its apparent KA-6 has much greater L/D floater since KA-6 covers three times distance same amount time still match ing rate descent floater Now practical application Let us launch both planes under calm wind conditions small patches lift thermalsalthough smallare rising rate three feet per second KA-6 floater will climb foot per second thermals cause said thermals small floater should much easier fly duration event because flying third fast KA-6 spends time given thermal allowed fly through both fliers equally proficient strain flying KA-6 under such conditions can unnerving However let us now thermalling continued page 93 22 Model Aviation Northrop Flying Wing contest winners Ito R Cecil Cutbirth 2nd Pat Seale 1st Roy Stow ers 3rd planes Ravens See Mode/Aviation January 1977 page 861 pcs KGL IAT LA 4 7th Annual 4Pre-Season Radio System Check-up Valid until May 151977 FULL TIME TECHNICIANS FACTORY TRAINED ST TEST EQUIPMENT NEW MODERN SHOP ONLY GENUINE FACTORY PARTS SFACTION GUARANTEED PR-SEA SON SPECIAL ONLY $2595 plus post aqe Perform Transmitter Battery Load Check Perform Transmitter Crystal Frequency Count Perform Receiver Battery Load Check Check Battery Charging Circuit Tune Transmitter R F Check Receiver Sensitivity & Adjust Align Receiver RF IF Stages Check Receiver Logic Align Transmitter Encoder Check Servo Stalled Motor Current Repair parts additional $2595 500 $2095 Less AMA CoupoeWith Repair ______ Net Cost Check Servo Mechanics Adjust Servo Centering Perform System Servo Noise Check Shock Test Complete Airborne System Range Check System System Flight Test Necessary AMA Membership Bonus uie Kraft Great Lakes Inc 6787 Wales Ave PO Box 2482 North CantonOhio 44720 BankAmericard Master Charge Welcome aa Jack Yarger Mark Porter 216 499-8310 4&ue 4osea/ ewcee Don Bekins VP Hank Scally Ted Kafer Sec/Treas Editor very fine newsletter New Jersey comes word projected contest activitiesCentral Jer sey Old-Timer Contest June 12 Somerset Signal Senders July 31 Soc Pres ervation Old-Timers contest August 28 Received flyer Joe Beshar 2nd Annual Old-Timer bash featuring unassisted flight except climb seg ment motor shutoff Hosted Old-Time Eagles event will held NAS Lakehurst NJ May 15 Thats now Please forward info photos Jack Bolton 8007 Fernclzff Ci Spring field VA 22153 Phone703455 -3809 RC Pylon/Lane continued page 19 excess epoxy dont glue movable surfaces non-movable sur faces epoxy fills holes hinges acts pin bonded wood both sides hinge have never type hinge fail flight Space hinges exery 3 4 Scale Cowl 5/a diameter plastic cowlfeatured World Engines Mr Mulli gan kitis available $300 suitable such aircraft Cessna 195 Stinson Reliant racing planes use radial engines Cowl kit white individual cowls come na tural color nylon World Engines 8960 Rossash Ave Cincinnati OH 45236 productrviwproduetrviwproducrevewproductrviem ailerons use two per elevator three rudder dont trust epoxy stake hinge use round toothpicks through entire structure sand flush outer surface See Fig 6 TOOTHPICKS HINGE ELEVATORSTABILIZER FIG 6 Well guess have rambled enough month Hope see Nats Go fast turn left Dave Lane 4477 136th Hawthorne CA 90250 RC Soaring/Pruss continued page 22 both ships suddenly encounter 10-mph wind old salts effects ther mals wind old stuff newcomers sport what some times causes new pride joy land undesirable places youre mid westerner its usually tall corn Come May1977 93 KRAFT think its always tall corn Picture thermal rising bubble air resembles invisible hot air bal loon As thermal breaks ground its direction movement flight whims windexactly th track hot-air balloon Now visua lize plane circling within ther mal staying confined within bubble As thermal rises also drifts downwind speed windin case 10 mph As lazily winding way upward downwardthere comes point decision has made head backand head ing back now wind Now both KA-6 floater enjoying same thermal both fliers equal skill both planes would same alti tude KA-6 would flying three times airspeed rather obvious has advan tage getting back launch site lets run through some figures also obvious floater flies 10 mph order achieve L/D 101 flying fasterthat decreasing angle attackthe airspeed will increase glide ratio will decrease rate sink will also increase Lets say glide ratio drops 71 L/D now 71 13mph Now back thermal Lets further say both planes launches nor mal height hooked same thermal now five minutes flight Altitude now 700 feet after five minutes launch release 10-mph wind both planes 4500 ft downwind KA-6 its higher L/D should make back launch point still 550 feet above ground Meanwhile floater hopes get back has increase its speed Its original flying speed 10 mph matched wind therefore will make zero mph over ground before mentioned increase speed 13 mph best plane can combine L/D 71 planes speed over ground 19 ft/sec minus winds 15 ft/sec 4 ft/sec would take floater over 18 minutes get back fieldif didnt run out airspace alas above figures floater does run out after covering approximately 2800 ft its tall corn landing Next month well discuss ballasting improve performance some usually lighter wing-loaded planes Dan Pruss Rt 2 Box 490 Plainfield iL 60544 Cheater Slow/Rutherford continued page 26 top fuse also acts reinforcement fuse itself two rudder pieces cut out being sanded provide offset shown glued together 3/8 X 1/2 top piece notched clear rudder offset rudder assembly just glued onto side fuse notch top piece rudder ugly works Dont leave off Before final installation linkage tank engine etc put couple coats dope exposed wood much re quired just enough fuel-proof thing Use clear dope expect good performance colored dope just too heavy Linkage want use normal con trol-horn set-up have found linkage shown much superior adjustment elevator travel can pre cisely dialed-in hit miss control horn call linkage shown Dial-A-Turn Give try youll like Heres First pick up package Rocket City Aileron Swivel Links stock No 69 Du Bro threaded pushrod split coupling sleeve long 4-40 bolt Make two doublers 1/32 ply plans show 1/16 generally use 1/32 glue place Drill 3/32 hole through doublers stab Screw 4-40 bolt hole cluding hinging no air gap between snug up nut washer epoxy surfaces type hinge strong top bottom Although plans show free action easy bolt straight try angle bit forRemove covering stab ward point attachment beglues fuse glue stab/elevator tween pushrod over hinge assembly place certain assembly line located squarely hinge line both Rocket City clevis screwed onto sides should equi-distant TE DuBro threaded rod too- far wing stab should parallel want some adjustment clevis wing sighted rear attach button screwed onto 4-40 bolt 3/8 X 1/2 piece now glued the clevis hooked up button top fuse notched rear belicrank stab neu clear stab rounded front tral position cut length pushrod simulate canopy seems satisfy wing Using good solder plenty think such silly thing heat DuBro split coupling sleeve phony canopy adds anything Slow join two pushrods Combat event case piece very own Dial-A-Turn hooked rather handy makes mounting up try controls see much up stab much stronger simply gluing down have total movement 94Aviation Model Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST B/C BASIC TBAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 Support AMA Price $3495 kit per dollar- har ens * DONT THROW IT AWAY * * RECYCLE rtising * R/C TRADERT * BUY * Every Issue items * Subscription Rates - 1-yr 2-yr * Low Advertising Rates 12e/word cribers 18/word subscribers * Find What Want Reading * Find What Need Advertising I/C TRIflER TM PO Box 833 East Lansing Michigan 48823