Finished tipperon-equipped prototype Sailplane have look carefully see fixed inner panels end movable tip panels begin style plane small degree V-dihedral best type trying tiperon controls Its authors design new way us obtaining roll control RC Sailplane holds promise greater efficiency greater effect landing speeds very least its food thought WERE ALL FAMILIAR ailerons function effects shortcomings us have heard entire wings rotat ing slightly opposite directions achieve same effect some short comings ailerons Either systems provides response improvement sig nificant efficiency loss Tipperons give fur ther improvement response far less efficiency loss Tipperons refinement rotatingwing principle refinement both ef ficiency simplicity Instead entire Joe Poletti wing rotating short section wing tip rotates glider 100-in wingspan 12-in section tip will just fine Polyhedral recommended Less normal dihedral recommended Use shoulder-mounted wings Before delving mechanics control device lets talk about advantages actual flight characteristics launch much difference conventionally-controlled Sailplane except bit lateral sensitivity After line release normal flight quick positive response significant reduc tion control surface movement immedi ately apparent bottom line reduction con trol surface movement increase ef ficiency together far better much precise control rotating tips create control effect advantageous position plane keep airfoil alignment tact major portion wings 78 Model Aviation Left Bottom left wing showing short pushrod horned rib snap-on ball-joint connectora must due path rod between bellcrank horn Near Right Top left wing modified bellcrank main pushrod fully retracted spindle inside spar Far Right same view near right picture shows main pushrod fully extended amount tipperon travel shown pictures far exceeds amount needed Top sheeting hasnt yet installed no inefficient aileron hinge line method control will interfere spoiler installation short tipperons very effective efficient providing super-precise control very low speeds such landing prototype Sailplane incorporating tipperons scratch-designednothing really complicated unusual just clean Both tipperons controlled single servo Y-coupled rud der servo simple way fly requires little experimenting get cor rect throw ratio ones individual prefer ence Approximately 120 trailing edge upthrow 70 trailing edge down-throw will adequate doubt about tipperon length simply allocate 20% wing area tipperon joint inboard main wing panel front spar bellcrank modified accept snap-on ball joint con nector short pushrod going tipperon horn case tipperon horn part inboard plywood rib tipperon panel Both control horns tipperons bottom side ribs bellcranks installed symmetrically main wing panel tip provides balanced load servo spindle gears gives desired travel differential tipperon spindles relatively easy 5A2-in-dia music wire rod used 5A2-in inside diameter Torrington needle bearings no inner race such bear ings prevent binding during high flight-stress conditions bearings %2-in outside diameter pressed aluminum tubing 1 apart end tube plugged music wire rod collared ex tended tipperon spar epoxied place inside spar aluminum tube containing needle bearings epoxied spar main wing panel becomes per manent installation must done cor rectly first time Desired high strength minimum weight Properly pro portioned will have high strength negligible increase polar inertia One-eighth-in wood dowels operating Sullivan Nyrod guides used main tipperon pushrods stay trim Clevises connect modified servo wheel directly opposed attitude am very gratified results performance Sailplane incorporating idea Try tipperons youll wonder February 1984 79 author Joe PoIetti displays new baby Hes member St Louis Eagles RC Glider Club best knowledge tipperon idea has never tried before what delayed arrival Best luck good lift Thanks Ray Teliczan coining word tipperon me
Edition: Model Aviation - 1984/02
Page Numbers: 78, 79
Finished tipperon-equipped prototype Sailplane have look carefully see fixed inner panels end movable tip panels begin style plane small degree V-dihedral best type trying tiperon controls Its authors design new way us obtaining roll control RC Sailplane holds promise greater efficiency greater effect landing speeds very least its food thought WERE ALL FAMILIAR ailerons function effects shortcomings us have heard entire wings rotat ing slightly opposite directions achieve same effect some short comings ailerons Either systems provides response improvement sig nificant efficiency loss Tipperons give fur ther improvement response far less efficiency loss Tipperons refinement rotatingwing principle refinement both ef ficiency simplicity Instead entire Joe Poletti wing rotating short section wing tip rotates glider 100-in wingspan 12-in section tip will just fine Polyhedral recommended Less normal dihedral recommended Use shoulder-mounted wings Before delving mechanics control device lets talk about advantages actual flight characteristics launch much difference conventionally-controlled Sailplane except bit lateral sensitivity After line release normal flight quick positive response significant reduc tion control surface movement immedi ately apparent bottom line reduction con trol surface movement increase ef ficiency together far better much precise control rotating tips create control effect advantageous position plane keep airfoil alignment tact major portion wings 78 Model Aviation Left Bottom left wing showing short pushrod horned rib snap-on ball-joint connectora must due path rod between bellcrank horn Near Right Top left wing modified bellcrank main pushrod fully retracted spindle inside spar Far Right same view near right picture shows main pushrod fully extended amount tipperon travel shown pictures far exceeds amount needed Top sheeting hasnt yet installed no inefficient aileron hinge line method control will interfere spoiler installation short tipperons very effective efficient providing super-precise control very low speeds such landing prototype Sailplane incorporating tipperons scratch-designednothing really complicated unusual just clean Both tipperons controlled single servo Y-coupled rud der servo simple way fly requires little experimenting get cor rect throw ratio ones individual prefer ence Approximately 120 trailing edge upthrow 70 trailing edge down-throw will adequate doubt about tipperon length simply allocate 20% wing area tipperon joint inboard main wing panel front spar bellcrank modified accept snap-on ball joint con nector short pushrod going tipperon horn case tipperon horn part inboard plywood rib tipperon panel Both control horns tipperons bottom side ribs bellcranks installed symmetrically main wing panel tip provides balanced load servo spindle gears gives desired travel differential tipperon spindles relatively easy 5A2-in-dia music wire rod used 5A2-in inside diameter Torrington needle bearings no inner race such bear ings prevent binding during high flight-stress conditions bearings %2-in outside diameter pressed aluminum tubing 1 apart end tube plugged music wire rod collared ex tended tipperon spar epoxied place inside spar aluminum tube containing needle bearings epoxied spar main wing panel becomes per manent installation must done cor rectly first time Desired high strength minimum weight Properly pro portioned will have high strength negligible increase polar inertia One-eighth-in wood dowels operating Sullivan Nyrod guides used main tipperon pushrods stay trim Clevises connect modified servo wheel directly opposed attitude am very gratified results performance Sailplane incorporating idea Try tipperons youll wonder February 1984 79 author Joe PoIetti displays new baby Hes member St Louis Eagles RC Glider Club best knowledge tipperon idea has never tried before what delayed arrival Best luck good lift Thanks Ray Teliczan coining word tipperon me