Control Line AEROBA TICS Wynn Paul Readers may wondering what has hap pened regular CL Aerobatics Con tributing Editor Wynn Paul Hes still alive well have experiencing mys terious problem US Postal Ser vice Wynns columns have lost tbe mail past two months time has realized what has happened has too late too close publication deadline anything about situation So insurance CL Aerobatics would covered month weve asked Lou Dudka write column HAVE ever wondered pro files have funnies hard inside corners ship isnt profile say has Part problem may lack torsional rigidity fuselage Model ers have looking ways increase paying significant weight penalty Doing worry about weight easy seems either Believe solid fuselage carved out balsa strongest construction direction wood grain all-important Lets define torsional rigidity mod elers point view Have someone hold wing plane steady Take hold stab try twisting out alignment same eyeing front back airplane talk ing about stiffness stab although thats also important can dealt later date plane like fuse will twist before stab starts bendespecially stab foam-andbalsa construction Again does nec essarily mean stab stiff enough friend still has wing steady take stab try bending out align ment looking plane top type force tor sional once fuse starts bend tor sional rigidity deteriorates rapidly worry about torsional rigidity Lets take worst examplethe profile Stunter Profiles exhibit two major faults lot ones Ive seen fly stab out align ment Yet examination after flight shows stab true However uneven forces stab due difference airspeed over elevator inboard outboard tip Most probably though building error elevator might slightly largeror exactly line same building errors may exist full-bodied Stunters yet dont seem affected level flight cause fuse doesnt twist much does profile second fault profiles almost hinges drops outboard tip bottoms hard inside corners such Wingover Triangle Hourglass Most people attribute fact engine tank muffler hang off outboard side however about inch-and-a-half out fuse tip weight perhaps two feet away has much effect air plane flies off stab whatever attitude stab has within reason rest plane should follow fuse isnt torsionally stiff enough withstand forces put hard corner stab wing will line plane will hinge effects later Now know what it hurts us what fix could some obvious things such use thicker heavier fuse sides hollow blocks less measures would include weight penalty would willing pay would help much following alternatives method put extra bulkhead two between flaps stab weight negligibleabout 2 grams 07 oz nice part gain torsional stiffness linear shorten distance between two bulkheads bylets sayan inch dramatically crease rigidity Another way increase fuse width rear near stab and/or deepen bulkhead directly ahead stab fuse 1-in wide measures will pay off certain extent remember addition weight gain wood will still have paint increased area Also consider deepened larger fuse area back will affect per formance Bob Gieseke actually decreased side area Nobler Yet another trick bulkhead top bottom blocks Two things important First totally canoe-out blocks dont hollow try leave bulk heads same time Trying retain carved-in bulkheads difficult importantly wood grain running wrong direction grain should square fuse parallel hinge lines best way Ive found to mold piece solder hollow block get shape Lay solder piece Continued page 162 LADOER- USE 3/32w BALSA BE SURE TO HAVE GOOD JOINT WHERE MEMBERS INSTALL THESE TWO BOTTOM OF MAKE X MEMBERS FROM 1/8 x 1/4 BALSA Does plane suffer lack rigidity between wing stabilizer youll never achieve sought-after perfect flight text discusses some ways strengthen area increasing weight very much illustrations show top gladder fuselage further described article ensures straight twist free fuselage time 72 Model Aviation Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans miner outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly loss radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShow ream required show model flown SPECIFICATIONS Size KPS 1411 Servo Case Powar 17 ma Volt Cut-Out Point 46 volts Pulse Width Range AdI 0628 milliseconds Systems 3 4 wire TemD Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connector type positive negative pulse ordering RF Enterprises 106 N Main St Arlington OH 45814 419 365-5065 Cant Forget stro-Hog Now Mini Mighty Plan Size too Scratch-building WE " ""ern sets way go get best complete Fall-Size layouts parts drawings r trials sane up Pattern Trainer Astro-Hog became classic RIG Pattern years ago now offer Plan N Patters Drawiogs 54 ge en sonfo todays Osadra-sized yowerylantn Mini Ce 505 too smaller engines THE AS TRO-HOG 54 54 Wingspan 450 Sq In.19 Engines 15-35 Plan N Pattern Set RCT 1 $995 THE MIGHTY-HOG 94/ Wing 1375 Sq In22 Engines 1326 Pan N Patte n Set RCT 2 $2495 THE MINI-HOG 47/u WIngspan 340 Sq 09 Engines 063 15 Plan N Pattern Set RGT3 $695 Prices far Complete Plans Sub Assembly Detailed Parts Lists Add 52011 Mailing Tube SEND FOR BROCHURE ahead crowd New Brochure showing new Plan Sets 1g83 1584 Send Si tIll its refundable first orderl 1936 importance limited run during test phase readily recognized Some fliers adapted clockwork timers cut power Condon added external knife switch string attached al lowed him cut power things didnt look good Some tied strings tail skid running after model string allowing climb about 10 20 feet gradually slowing down model loses speed sinks down pressure tail prevents nose dropping making model pancake sounds logical doubtful has much use adjusting models because model true free flight long enough see exactly performs modern version could Real men dont tie strings models Interestingly author exhibited fore sight discussion limiting engine runs stating Cheap toys offer large assortment gears springs etc light simple device limiting engine runs can fashioned Tomy-toy-based timers being used Free Flight today can wonder vision Clarence Hctught 3226 Honeysuckle Dr CoeurdAlene ID 83814 CL Aerobatics/Paul Continued aoe 72 -in balsa check direction grain draw around felt-tip pen cut out sand shape actually lot easier seems since install Hot Stuff microballoons baking soda fit doesnt have perfect microballoon fillets also help relieve stress concentrations sharp internal cor ners careful force bulkheads will spread block will fit properly installed fuse Sec ondly make sure bulkhead block lines up exactly bulkhead fuse box closed lot rigidity will lost dont meet install bulkheads leave little long sand flush block weight gain 3 grams 1 oz top block 15 grams 05 oz bottom block Weve saved best last middle construction have fuse blocks handy take twist watch what happens fuse side goes forward other rearward depending way twist bulkheads actually deflect no longer parallel hinge line Think affects stab flightit actually twists pulls two directions action distorts fuse bananas inward outside maneuvers can imagine what havoc must cause Ive seen plans diagonal braces shown directly fuse sides really answer although will help Any wood wood grain wrong direction will stiffen things up trick get effective strength-toweight ratio few people tried putting triangular gus sets approximately 1-in legs horizontal plane between bulkheads fuse sides effort keep bulkheads twisting fuse sides shift ing definitely improvement move right direction What finally wound up doing taking /e x 1/4 balsa strips installing X pattern top bottom tween bulkheads shown illus tration extremely important two members have good glue joint cross cant stress enough Install bottom ones first fuse weighted down flat surface may build twist increase strength nothing short phenomenal increases torsional rigidity also increases re sistance bending mentioned beginning article total weight-gain 4 grams 14 oz Some Free Flighter used build ing bird-cage structures probably sitting back chuckling himself saying could have told you dont anything else new next Stunter wont sorry type thing have feel hands appreciate what quantum leap strength really total 105 grams 37 oz have strengthened fuselage far could imagine Im going use 3A2-in balsa instead Va-in fuse sides next ship still maintain rigidity should totally offset weight gain Free lunch subject fuselages try building top ladder shown illustration weighs next nothing practically insures will have straight fuse As matter fact can cut completely out right before install top block keeps things straight youre building fuse also keeps way cut out fuse install wing make ladder install first two bulkheads way normally would cut ladder out 3A2-in balsa draw centerline Put few random holes thru centerline can line up fuse building board Pin weight down glue fuse sides want can lift off build rest fuse air point Cut out lightening holes after installing bulkheads Some builders area such Glen Meador Ed Capitanelli run ladder full length fuse pin down ladder glue fuse sides drop motor mounts rest bulkheads very slight weight gain absolutely ensures straight fuse since first two bulkheads gn cluded ladder use either methods 162 Model Aviation WE Technical Services PO Box 76884-A Atlanta Georgia 30328 0-o CD p 0 o _ • m CD 0 o i2 04 rn o m Ou 0 CD- 0 . 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