Free Flight: Duration

Duralion El Bob Meuser Hatsdiek towhook latest long series Nordic glider towhooks product nimble mind fingers Unimat Bob Hatschek Long Island Hatscheks surprisingly best lot combines ad vantages Russian style hook earlier Hatschek hook compactfits inside 1 od aluminum tube light65 grams plus 15 6 grams mount depending mount ing style secret design use safety-pin type spring rather usual coil compression spring ver tical height occupied spring twice wire diameter spring compressed has non-linear char acteristic spring rate pounds per inch decreases spring com pressed allows breakaway force large fractionSO 70%of unlatch force could accomplished long coil spring obvi ous disadvantages have ever flown glider too soft action will appreciate feature adjustments except rudder line length course made towhooknone rudderand adjust ing screws accessible bottom Slotted holes mounting bracket permit adjustment fore-andaft position requiring re-adjustment length single rudder line rudder horn used device piece music wire end consists short coil spring rudder line attached simply pushing between loops spring effective length rudder horn determines its sen sitivity towhook adjustments can altered bending wire up down uncoiling part spring Further adjustments except spring force loaded dont have make self Bob will glad sell mere $20 postpaid US Canada $1 additional air mail other coun tries seems like lot until con sider what get money cluded basic hook unit completely assembled calibrated A/2 gliders soft spring suitable A/i size gliders sheet metal pivot tube making various types mounts partially made wire rudder horn extra shorter glide position adjusting screw brazed spring-steel towring Allen wrench performing vari ous adjustments Cry little send hard-earned money Bob Hatschek 316 Grosvenor St Douglaston NY 11363 Vac-U-Form Awhile back mentioned picked up Mattel Vac-U-Form unit putting ad company news letter suggested putting note bulletin board work Bob Klipp tried got three answers must millions things out somewhere also call attention article about home-made vacuum form ingrigthat appeared April 1976 issue Model Builder Half-A-Floats floats shown sketch used Howard Doering Jr establish A-Gas ROW record Lake Elsinore January model 4rudder Stra6ht tow Circle tow 1/match & zoom 42 Model Aviation all-new Hatschek glider towhook left Upper unit picture has belly mount Lower left aluminum tube fuselages shows hook latched Lower right shows mount through pin type Graph lines spaced 1/Sin apart Middle Towhook unit before assembly Right plus complete instructions what get Meuser pix Below Drawings illustrate four operational modes -I 47ide Jim Clem-designed Fire Wagon powerplant 051 Holland Hor net labeled floats Half-A wont get idea intended large A-class model model weighs about 6 oz heavier lighter models width can varied accordingly Wider safer also produces drag Pre sumably floats could scaled up models other classes Hydro flying sometimes thing usually involves quickie conversion existing VTO hand-launch model float struts made 1/16 music wire can sandwiched between pieces plywood structure sandwiched between engine firewall An identical some what smaller tail float can lashed place somehow front floats extend bit ahead prop installations Rudder area does often have changed rudder effect tail float usually about balances anti-rudder effect front floats Doering elim inated sub-rudder Fire Wagon record maker Doerings method lashing floats struts rubberbands sort nifty provides means adjusting incidenceby shimming between strut transom floatand flexibil ity Note basic float rather light construction region near rear strut attached heavily reinforced plywood Plecan Update February issue mentioned some neat goodies avail able Paul Plecan just after went press changed address new PO Box 2838 Fullerton CA 92633 Prices some goodies Monocoupes Men $495 Lightplanes Since 1909 $595 Stinsons $595 prices postpaid ____ 5 AtolL - sides bottom~ Au j /1 / ]{card Voerin8 Jr 5 Pauls Index Digest Model Build er magazine sells $150 postpaid really goodie Model Builder magazine relatively heavy free flight have subscriber perhaps index will help decide whether subscribe what back issues might like pick up main items regular monthly columns Bob Stalick Bill Hannan Fernando Ramos John Pond listed 45 Peanut Scale plans 53 three-views full size air craft have appeared through 1975 have listed example other general model aviation magazine indexes available appear Flying Models British magazine Aero Modeller extremely useful wish Unlimited Rubber Record Bob White set national record Unlimited Rubber K1 vi 2ubher/and wze 1 tube bind u-it/-i - wiF S/-tim under vire strut angle aL4Lsrhze flt LA 7iydrc Jloaz Category II using fabulous Twin Fin taking away Jim Lewis total score 66 mm 19 sec model its predecessors has held Category rec ord three times Category II record twice presently holds both Cate gory Category II ROW records Recently has won US Free Flight Champs Phoenix Southwest Region als Fresno Annual received Model Year award Nation al Free Flight Society 1973 con struction article about Twin Fin appeared June 1973 issue Flying Models Full size plans available $2 postpaid Carstens Publications Inc PO Drawer 700 Newton NJ 07860 Plan CF-300 Toni Whites account memorable dayDecember 18 1976at Lake Elsinore discussed during drive Bob decided would May1977 43 j ply gusiet inside O~ 6J%~ ~ o~ White did again famous Twin Fin setting Category II Unlimited rubber record 66 mm 19 sec Fudo Takagi photo try Unlimited record weather good started flying remarkable Twin Fin 830 flight seemed get better better weather start ed out so-so later turned best flying days have ever seen Jim Quinn started flying Unlimited too later Irvin Aker also started flying both dropped max start over again Visibility excellent little drift Starting about 11 am seemed thermals would hard come once models got up 200 feet just kept going up Bob easily made 10-minute flight breeze come up attempt 11-minute flight timer lost sight model half-dusk light 8 mm 19 sec Toni pointed out Randy Secor Bob assisting set Junior Category II record 62 mm 13 sec 1972 using Twin Fin letters received Wide circle Irim a4iust circle Mark Drelas spin-tab DTfor HI gliders des cent an8/e Yuse sn/r tube /fr side other fliers US abroad indicating Twin Fin served writers well competition Book Review Basic Aeromodelling R H Warring Model Allied Publica tions Ltd 1976 Ron Warring no new comer either aeromodeling writing about earliest book collection authored him published just 30 years ago likely first book basically expanded updated version long series arti cles Basic eromodelling published Aero Modeller magazine late sixties curious sort book isnt word about R/C C/L specifically isnt 100% free flight book either isnt word about engines rubber-power prop carving few words about adjusting models flying book heavy materials tools construction techniques covers areas extremely well Having once owned early Austin Healey 100-4 having serviced repaired according instructions furnished works manual thought pretty good translating English American language whenever read publication talks about Paxolin strawboard Perspex obeche wood Evo Stick such have little problem misspelling words like modelling likely get bad habits Fortunately context Rons book makes fairly clear what sort material talking about instances identifies materials ac cording American nomenclature have often read British publications supposed stick tissue onto framework something called paste Certainly English paste cant anything like American paste because dont think have ever heard anyone US sticking tissue balsa what refer paste gather Rons book British paste deed something like American paste perhaps something akin water-thinned white glue Ill still stick dope dont mind book profusely illustrated photos line drawings photos excellently designed com posed illustrate point repro duction atrocious Like fuzzy line drawings however up MAPs usual highest standards sort fashionable critic nit-pick book half death guess sort what have done book isnt pretty darned good begin dont bother mention Ron excellent modeler writer teacher has written darned fine book cant find local hobby shop can purchased directly MAP PO Box 35 Bridge St Hemel Hempstead Herts HPL lEE England price barring unforeseen appreciation pound sterling $504 plus $128 postage surface mail Continued page 99 44 Model Aviation left five sizes tanks CO2 motors now available Peck-Polymers right adapter permits using economical Ansul fire extinguisher cartridges charging flight tanks Brown Shark Telco motors Both pictures Meusar Jim Foster shows off Peck-Polymers Nite 16 Model can converted rubber CO2 back again just minute have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA