Free Flight Duration Louis Joyner 3657 Drookwood Ed Dlnnlngham AL 35223 LAUNCHING One day about decade ago few grownups kids flying Frank Zaics Flash X-12 designs front yard case familiar X-12 its 12In-span all-sheet-balsa stick Rubber model Frank offered good description slightly larger X-18 1975 NFFS Symposium Anyway noticed grown-ups getting consistently higher climbs rest us wondered Since doing winding knew extra turns werent source extra height finally occurred person getting highest climb left-handed Instead launching model right bank giving about 30-degree left bank seemed minimize well-known heightrobbing dip end power burst Often dip seems like flat tight turn right after power drops off can manage left-handed launch X-12 no way Im going try Wakefield other methods keep ing nose up way through climb usual trim contest Rubber model volves crossed controls Right thrust effective low speeds balanced left rudder effective increased airspeeds crossed-control trim used autorudder-equipped models case rudder tripped left position during climb right position glide later Crossed control right thrust left rudder works like autopilot control climb pat tern model gets going too fast right spiral left rudder opens turn up before spiral dive can develop craft noses up too much slows down right thrust pulls around right before stall can develop course balancing thrust rudder settings best climb takes bit trial error started off talking about launch rudder adjustments Well believe launch speed attitude has big effect Rub ber models An experience about year ago brought painfully home solid balsa high aspect ratio Wakefield climb ing great practice semifinals week later model couldnt make two minutes difference launch Though practice launches hard nearly vertical could make official flight held back wanting mess up what should have easy max too-shallow too-soft launch didnt get model going fast enough left rudder setting take effect So right thrust took over pulled model around right conspiring too0o, 12 TaiMepHae dens 2flempo8a i ff00 r47 OSdVWMbILt 200070 Th0M0 25 o&t U 2o hOeDenno rocmopwUi no Len 0C*&J 0500/ MO ROAM nOOoD0mO fltna44 maca n.aoer/ \ OOoaenymoquoafl K ACMO 505 SO Olnem eohraOJ flOn*O (AC mnnoud ennat L no8**~* Sod rjada 4 ii z 25 S UPUIAO mnLao 0f 40 mntae 11 500 Soviet publication Wings Motherland unusual tailless power model uses 25cc engine spans bit over 6 ft Note interesting rotating wing tip dethermaiizer shallow launch produce textbook example tail-chasing dip has bane Rub ber fliers years examples far discussed have involved fixed surfaces least during climb addition clockwork timer however several other options available improve climb Some Soviet FIB fliers use wing wiggler combination autorudder wing wiggler mechanical device oper ated off timer holds left wing slightly less angle incidence right during first 10 20 seconds motor run works much like washin right wing spring-loaded device moves left wing slightly until same angle right rest cruise glide An autorudder VIT variable-incidence wxo tail also used provide right glide turn case VIT reduce looping tendency during first part climb side benefit wing wiggler very straight climb great piggybacking off models already lift Richard Blackam offered excellent account wing wiggler ar ticle Russian Approach FiB May 1989 issue Free Flight Ed Williamson El Paso TX describes other trim package using believe idea came Joe Foster Ed uses autorud der trips about four six seconds going left position slightly less pronounced left setting cruise glide com bined VIT tripping about four seconds effect first few seconds Ed flying right-climb left-glide model lockedup no-gadgets type made popular Bob White Thats perhaps biggest advantage setup Trimming much easier since can trim model locked-up airplane up about 80% turns add extra left rudder down stab burst can ad justed independently cruise glide best climb dreaded dip have found its much easier trim type model auto functions trip towards end cruise testing stages motor run shorter find very difficult get things trip right time Besides after everything supposedly set different batch rubber will give longer shorter motor run throw everything off big disadvantage type trim locked-up right-left model transition right climb left glideyou can transition Out thermal get around still have advantage left rudder during burst some Soviets Europeans use three-position rudder Typically means left setting first few seconds burst almost straight set ting cruise right setting right glide Stefantchuk uses split rudder top half moving independently bottom half simpler system Danish modeler Jorgen Korsgaard shown sketch Basically uses pivoting arm acts stop cruise portion climb prop-stop trips kpwuu SpmuuaAbnOQ nnotrnUJnO ltOrntM aminOlL..w8ounvcnecwoy5 83 PT AYIAetna *05 LA HJPOEAHUP BudA 000-flPLJIIYAUTPASHAQ flOCAAIA 80 Model Aviation Yugoslavia Marjan Kienovseks Wake field front end includes carbon-fiberreinforced epoxy hub fiberglass spin ner Units custom machined fit front end Details text lever front model releases line allows pivoting arm swing Out way torsion spring pulls rudder over right glide position Still pointed out earlier can naught launch isnt right good grip essential Sandpaper side fuselage best ways keep model slipping out sweaty hands Rex Hinson came up neat way uses hole puncher make 1A-in-dia discs out 220grit sandpaper glues grid pat tern good gripand good launch makes possibleis especially important power model yet extra noise grease daunt ing Birmingham AL power flier Jim Larkin having trouble inconsistent launches traced trouble basic launch method Jim trying throw model like HandLaunched Glider runup meant right arm model moving arc too-early too-late re lease would put plane either too steep too shallow angle climb After looking some photographs some top FiC fliers world during launch Jim noticed cases both feet off ground Now just cant get position Hand-Launched Glider type launch Rather requires sort vertical hop done bending both knees springing straight up also allows left hand used steadying wing during launch Jim reports launches seem much consistent now Bumble Bee update Swiss modeler Roger Rup pert kind enough send along some addi tional information about all-plastic Wakefield see April 1990 Duration column credits fellow Swiss flier frequent team member Dieter Siebenmann basic design trim bit unusual some models using three rather two VIT settings wing wiggler used tripping 11 seconds autorudder trips four five seconds later functions plus delayed prop release DT worked off Tomy-type timer mounted either pylon just behind motor tube propeller variable pitch going plus-one degree start plus-four minus-four degrees Ales 7A VAA/feM 77L A/ O4 eco-04 /fAI O2 /#f qzu-ee /fD 2 v gwva Go Danish filer Jorgen Korsgaards three-position autorudder allows burst cruise glide turn set independently simple ingenious design pitch distribution helical 690mm pitch set 800mm 70% radius blades have 330mm radius rather interest ingly shaped maximum chord 45mm 35% radius tapering sharply tip Theyre molded Rohacell 71 foam 83g/m2 carbon fiber cloth New Goodies Sal Fruciano Starline sent along several new items importing Poland FlC engine mount front fuselage sort resembles chrome-plated exhaust ex tension car machinework really beau tiful highly polished finish alumi num weight sample examined 116 grams cost $90 lot less expensive just nicely made rubber winding hooks Sal sells $5 similar ones Bob Piserchio sells hut filing finishing work done Polish timers still available including Wakefield timer copied after Andrujkovs Al though mechanism similar profes sional model includes larger scroll good up nine minutes color-coded trip arms weighs 145 grams Cost $30 Order Starline International 6146 E Cactus Wren Rd Scottsdale AZ 85253 tel 1-602/948-5798 Yugoslavia comes well-made Wake field front end Marjan Klenovsek has mak ing four five years now quite popular around globe front end fea tures reverse-Montreal stop two instrument bearings Total weight including adjustable pitch fittings about 28 grams Marjan will custom-make front end fit motor tube Just supply him inside outside diame ters Cost $44 plus $5 postage Send orders Marjan Klenovsek Skapinova 1 63000 Celje Slovenia Yugoslavia Another fine Wakefield front end available Bob Piserchio Montreal type have remove spinner set stop hold pins weighs 27 grams costs $70 Bob will custom-machine front sleeve fit mo tor tube will include desired downthrust right thrust Other goodies include adjustable-pitch prop hangers tail boom coupler two-piece fu selages Write Bob 5257 Stone Court San Diego CA 92115 info complete price list Im sure stamped self-addressed en velope would appreciated German publisher Christian Neuber sent along copy catalog model plans another German-language technical publications plans catalog includes lot RC Scale stuff well boats steam engines cars trucks few interesting vintage Free Flight models well few recent designs cluding 1983 A-2 towline model other catalog includes enough technical books make wish taken German stead Latin high school As expected lot books RC Electric flight catalog also includes book Free Flight another Indoor several airfoils couple composite construction can check out ad August issue Model Avia don write Verlag fur Technik und Handwerk GmbH Postfach 11 28 D-7570 Baden-Baden West Germany 1990 Planbook Andre Schandel editor French bimonthly Free Flight magazine Vol Li bre has produced 180-page collection plans photos top Wakefield Nordic Power models around world Only 600 copies 1990 Planbook will printed get order today Cost $12 Peter Brocks 313 Lynchburg Drive Newport News VA 23606 Peter will also glad han dle subscription Vol Libre $21 six sues Make checks payable Peter Brocks U January 1991 81 FAI power engine mount front fuselage Poland Includes rather lethal-looking landing skid Unit weighs about 116 grams available Starline Also Starline two timers bottom Andrujkov-inspired expert version wIth extended scroll color coding trigger arms
