Free Flight: Duration

FREE FLIGHT DURATION Typical FlA bunt mechanism Note high stab mount permit stab TE deflect down 10 20 mm bunt FEW COLUMNS BACK asked anyone out real-world experiences turbulators Jim OReilly sent along letter tracing experiences asked additional poop turbulators have story speaks turbulator spar issue 1986 Vol Libre Hans Gremmer published piece wind-tunnel tests actual model construction airfoils Included Hofsas Espada clean couple turbulator styles favorite Benedek B7406f no on-purpose turbulation other leading-edge discontinuity two clear winners Espada 2D turbulator B7406f Up time building Gard tapered sheeted balsa D-box jig tedious build aggressive turbulators about 7% 20% although recall used 7% saw Gremmer article asked myself knocking myself out drew up stick-and-tissue wing based B74O6f Easy build flew great fullness time came ex-USSR style graphite Kevlar style D-box Back jig new jig building B7406f wing first wing glided about like horseshoe right before Finals Palm Bay discovered So stuck bralded fishline turbulator about 10% Palm Bay still glided like horseshoe consulted Fred Pearce Fred told probably turbulator too far back suggested 5% ripped off turbulator glued back 5% Success found hard Clockwork timer Valdimir Fedorov features knurled scroll easy winding spring-loaded trip arms believe moving fishline forward about 2 inches could make such difference Meanwhile several B7406f wings stick-and-tissue glide like buzzards. turbulator sight June1995 101 Blame Miller high-tech carbon-wing FiB Carbon painted white epoxy before covering Photo Rex Hinson Ready-to-use Wakefield pylons Burdov top Vivchar come timers start switches installed above conclude following Turbulator spars cant work unless very far forward entail very significant discontinuity Obviously old thick highly cambered wings glided well Something working As far am concerned leading edge discontinuity gets credit leading edge discontinuity Jim talking about slight ridge bump caused tissue sagging just behind leading edge may seem like much turbulator usually its just right spot Jims mention Espada section reminded own experiences thin highly-cambered section Like Reiner Hoffsas original model featured solid balsa wing quick build heavy prone flutter first used conventional thread turbulator glide didnt look good thought should Next removed thread cut some V-shaped sawtooth turbulator notches glide looked better Finally added narrow tape invigorators top wing starting about 25% helped model glided very very well bonus seemed much better able handle turbulence wind So dont afraid experiment especially model glides like horseshoe can get better proper turbulation Jim asked remind now running plans business 15 plans line range Lanzo Puss Moth Civy Boy 84 drawing plans CAD system exceptionally clean accurate Also available Leslie Bartletts Scimitar 1/2 Nostalgia Les DeWitts Whirlaway C Nostalgia Winterhawk III Coupe dHiver Jims own Tubular Bustard P-30 Most plans sell $7 plus buck postage Jim OReilly 4760 N Battin Wichita KS 67220 Ask him about some other free flight products Wakefield Symposium last few years John Lenderman some other folks Pacific Northwest have putting Wakefield Symposium offers opportunity West Coast modelers get together share thoughts experiences secrets FlB recent held January 14 included presentations 1995 Wakefield team member Dan Tracy well discussions Blake Gene Jensen Ralph Cooney Rick Ewing Canadian Norm Beattie Topics included model development construction trimming tactics air picking Rubber quality winding techniques alumtube guides epoxied position discussed use DPR delayed prop release group also talked about issue scratch-built models versus purchased models proceedings professionally recorded three 90minute tapes available Bob Wood 1480 Conyers Creek Road Clatskanie OR 97016 Cost $14 postpaid Starline Sal Fruciano sent along some new Ukrainian Russian free flight supplies importing under Starline Interuational name neatest very light about 12 grams timer Vladimir Fedorov Moscow features two discs plus scroll DT three arms spring loaded give quick positive release lines scroll knurled easy winding eliminates usual winding ears scroll have habit catching trip arms As can see rear view 8 BA nylon boltaluminium sleeve alumtube threaded 8 BA concentric alumtube o 1mm ply stabiliser n line bunt adjustment8 BA nylon bolt aluminium skidscrewrounded head nylon lock nut... stainless steel line 10 BA bolt 10 BA bolt two offcuts carbon TE epoxied boom 1mm apart bottom boom cut away provide access two concentric aluminium tubes cyano together crush end pivot inner tube threaded 8 BA Peter Tribes simple homemade Fl H bunt mechanism shown drawing Free Flight News 102 Model Aviation view timer shows effort put forth Fedorov save weight Original brass plate shown comparison Easily replaces leaky old brass fuel cap fittings new ADVANCED AERO FUELER easy use flight line fucing system ecially designed nylon color coded lock g quick disconnect fittings used fuel glow ciigines After fueling fuel Ott tern orary airtight seal made snapping fueler obe tipintothecap vent fluin r disconnect fueler prube half turn fitting 4 coiled tubing body onto caps vent gforalockedin -fuelfresh-airtigbtseaL iu end day end season can sure fuel will re nain fresh -- free AIlTIiV Vladimir has put lot effort reducing weight timer Price $38 Also available two Wakefield pylons complete timers start switches Both made Russian aramid cloth version DuPont Kevlar Andre Burdov one-piece molding uses simple bent-wire start switch similar Andriukov switch timer three-function unit using single disc knurled scroll Weight 272 grams Price $48 other pylon Igor Vivchar bit heavier 316 grams seems better made pylon two-piece casting seamed down center finished gray primer timer start switch fit flush pylon face reduce drag timer features three functions rear well nicely-designed front release lever DPR delayed prop release Like Burdov pylon features curved flange designed fit 32mm-diameter motor tube Vivchar s pylon also includes vertical former extends wing wire tube down bottom pylon Cost $75 thinking about giving Wakefield try either pylons would good way get started minimum time trouble problem tack room front-mounted wingwiggler mechanism ones commercially available could either make own rear-mounted wiggler use three-position rudder help control power burst seems plenty room add small transmitter tracking model Write Sal latest catalog free flight accessories around world Starline International 6146 E Cactus Wren Rd Scottsdale AZ 85253 Simple Bunt Modem high-aspect-ratio gliders share common problem long-winged power models dont roll very well can cause poor recoveries power models well zoomlaunched gliders cure both bunt Basically one-quarter outside loop takes model near-vertical LESS Dieselize L Its Awesome P0 Box 141 Dept MAMilfordCT06460 complete in~ation packet send $400 icreun 0F 1-loilineY*3 century Aero rroducts inccmrtexe WF toiled 2763 West Ave L Suite 295Tubing Fueler Probe Lancaster CA93536& Filtingiregular puce $14 95 CA residents add 825% sales tax MASTERCARD & VISA ACCEPTED ear an-e car ucu-, crr SASE FOR FREE cATALOGE Copynthi 1995 Patent Pending free flight fun Peck-Polymers planes plans props paper tools CO2 enginesyour next caper US Czechoslovakia tremendous assortment_____ types sizes 1d radial 7W-~ catalog kits accessories engines nrne-cylner engine endless ideas available $400 1PckPeIjIuets stop shopping rubber power end C02 needs P 0 BOX 710399MASANTEE CA 920720399 USA1619 448-1818FAX 1819 4481833 FAITANIIRUBBER 1/4 /16 1/8 1/16 042 THICK 1 lb box $1 6 UPS delivered US 10 lb box $118 UPS delivered Made USA. CA res add 8% sales tax KSB fuel timers $13ru DT $19uu Silly putty timers $5 Front ends winders stooges Books Czech P30 props Slick Lube CROCKETT hooks plus kinds super accessories huge bunch great FE kits Send $1FAI Model Supply 1994 catalog P 0 Box 3957 Torrance CA 90510 Phone 310-830-8939 104 Model Aviation * THE FLIGHT BOX THAT BRINGS EVERYTHING YOU NEED TO THE WOT BOX FLIGHT SUPPORT FIELD PLUS 9SuperPowerPanel Reverse Polarity Protected 4 Expanded Scale Voltmeter Mon/br RX& 7X Charge * Lighted Fuaed Maater Panel ControlSwitches d Glow Plug Battery Charger Auto Glow Driver t 12V Glow Fuel Pump Fuel/Drain Switch s 2 12V-7amp 011 Cell Batte rlea Sure Starte Monitora Charge Status Main 12 Volt Battery olt Engine Starter Outlet lElectrical Terminals Pre/Post Flight Seat 300/b capacity e Storage Area Lift out Storage Tray FUEL PLATFORMAND 32oz FUEL BO77LE CON VENIENTPROPELLER STORAGE Summer Fun SpeciaI{jj $32995 ITi1 II ] o] Airborne Video Excitement Other Mobile Uses 1250 x 1250 x 400 5 ounce 1812x 17345x 980 1 ounce PPORA7D Oivier Yaws Today ige * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse $299 Cat No 202 Air Cleaner Fine $299 Replacement Inserts Cat No 104 Pkl2 Inserts Coarse $239 Cat No 204 P142 Inserts Fine $239 FITS MOST ENGINES 25and UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Box 3786 center Line Michigan 48015 Add $250 shipping igan residents add 4% sales taxi climb glide position pioneering theoretical work developing bunt FlA gliders done Mikhail Kochkarev Sergei Makarov Moscow very detailed analysis bunt featured 1991 Symposium National Free Right Society can order copy Sympo Fred Terzian 4858 Moorpark Ave San Jose CA 95129 cost $16 plus $250 postage Commercially made bunt mechanisms available both power glider bit expensive heavy smaller FlH gliders known A-i country Peter Tribe England developed simple cheap easy-to-make bunt mechanism shown sketch Free Flight News says takes about 10 minutes make using aluminum tubing nylon screws Im sure exact equivalent 8 BA bolt either 2-56 4-40 should work Note bunt system stab comes down bunt position fraction second before going up glide position Remember want quarter outside loop way subscription rates FFn have changed recently current rate 12 issues United States $30 information write FFn 7 Ashley Road Farnhorough Hants England GU14 7EZ Keeping Cool Carbon-fiber spars rib caps trailing edges molded D-boxes makes wings strong stiff light also makes black can problem models sit out sun daythe black carbon absorbs suns heat expands stiff wings could lead warps softening epoxy matrtx Blame Miller used latest carbon materials new Wakefield painted entire upper surface wing white epoxy paint before covering white polyester result wing stays good bit cooler out sun way Blames first rubber model features DPR wing wiggler VIT variable incidence tailplane AR auto rudder Model Aviation atdibslWrjd Rawted TOLL FREE 1-500468-2692 Mar West iWg Dial Co Inc 3339 Fitzgerald Rd Suite Rancho Cordova CA 95742 TEL 916 961-4 703 FAX916 003-1923