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Left side view of aircraftTop view of aircraftSpecification 5KY2Wingspan:10,985 mLength:8,050 mHeigth:3,200 mWing area upper: 16,2 m²Wing area lower: 11 ,5 m²Wing area total: 27,7 m²Horizontal tailplane area: 1,42 m²Elevator deflection up: 30°Elevator deflection down: 20°Stabilizer trim: +5° -2°Aileron deflection: 30°Powerplant: Hitachi Amakaze 11300hp, 9 cylinder radial aircooledPropeller:2 bladed woodMax.Speed:115 kt at sea levelService ceiling:5700m, 19000feetRange:550 naut. milesInstrument panelfront cockpitUpper wing airfoilLower wing airfoilInstrument panelrear cockpitFront view of aircraftYokosuka K5Y2 " Willow" ARF 8
The ModelWe have chosen the scale of 1:5 rendering amodel size that is easy to fly but also relatively easyto transport. Both the upper and the lower wing panelscan be removed for transportation which gives verylimited requirement for transportation size. Werecommend a 1.20 4-stroke or a .90 2-stroke engine.The 4 stroke engine fits in upright position and blendsvery nicely with the dummy engine cylindres. Thisaircraft was designed for limited aerobatics of the timeand can be flown through simple manouevres. At thesame time it was a trainer and the low speed behaviouris rather docile and allows for the pilot to think...This model has all control surfaces connectedin scale fashion. The ailerons are actuated viaconnecting rods to bellcranks in the lower wings, whichi turn are connected with wires via pulleys to theailerons in the lower wings. The upper ailerons areconnected with dual wires from the lower ailerons inscale fashion. The elevator is actuated via pull-pullcables from the control column. The rudder in turnhas conventional pull-pull cables to the rudder bar.The finished model is painted in 1940 JapaneseImperial Navy Camouflage livery and further detailingcan be made as per documentation. This model canalso be supplied in silver or orange color scheme.Model specificationWingspan: 86.6" (220 cm),Length: 63.4" (161 cm),Wing area: 1138 sq inch (110 dm²)Weight: 15 lbs 5 oz. (7000 g)Wing Load: 20 oz/sq’ (64 g/dm²)Engine: 1.50 4 cy. or .1.20 2 cy.Covering and finishThe model is covered and painted from thefactory. If you are going to use a glowplug or gasolineengine for flying, you must coat the interior of theengine compartment with a fuel proof paint.Installation of engine.Our prototype was tried with a Saito 1.50 4-strokewhich gave ample thrust. The engine mounts have beeninstalled for this size of engine and in an upright positionfor several reasons. The need for adequate coolingand to get the carburator in line with the center of thetank. It also fills the place for the top cylinder of thedummy engine.1. Drill the holes for the engine in the ½" plywoodengine mount. Install blind nuts to the underside ofthe plywood aligned with the holes2. Drill the holes from the tank to the carburator,pressure tap and the filling cap.3. Install the engine and connect the throttleservo. 1.5° side-thrust and 2° down- thrust is deemednecessary but can easily be incorporated at this time.Installation of servos, tank, battery and receiver.The aileron servo is installed in the lower partof the servo vertical bulkhead in the fuselage (accessthrough hatch in the bottom of the fuselage).The throttle servo and the rudder servo areinstalled in the servo tray. The tank is positioned onthe tray at the side of these servos.The elevator servo is installed inverted in thetray.Battery pack and receiver are positioned inthe upper part of the tray.The switch can be mounted on the servo traywith extension rod or on the instrument panel.1. Attach a ball link head to joystick and rudderbar in the appropriate holes. You may have to enlargethe holes to take the screw from the ball link (Dubro#189 set of 2).2. Install the servos for rudder and elevator andtemporarily connect the servo arms to the ball links.Deflection for elevator is 20° up and down and for rudder30° right and left..3. Install and connect the throttle servo in thefashion you prefer.4. Install the tank in the available space at theright side next to the rudder and throttle servos.5. Install the aileron servo in the bulkhead in thefuselage and lead two connecting rods into the lowerwings. The short aileron connecting rods attaches tothe servo arm. Deflection of the ailerons should be 20°up and down. This space is accessible through thehatches in the bottom of the lower wings.6. Install the radio switch on the dash board inthe front cockpit.Yokosuka K5Y2 " Willow" ARF 9
Page 1: Yokosuka K5Y2"Willow"Japanese Imper
Page 7: Yokosuka K5Y2 " Willow" ARF 7
Page 11 and 12: Landing GearFlyingThe prototype was

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