S-2B INSTRUCTION MANUAL For Intermediate and Advance pilots only All pictures and specifications shown in this manual are subject to change without notice.
S-2B Thank you for purchasing your Kingcraft Pitts S-2B ARF model. We hope you enjoy assembling and flying it as much as we did creating it. This super scale model was created in the true spirit of Curtiss Pitts, it is very straightforward to build and fun to fly, all the hardwork has been done for you. The airframe is an all wood construction using balsa and plywood and with a painted lightweight fiberglass cowling.
S-2B TOOL REQUIRED / REQUIRED ITEMS Ruler Clear Tape Hobby Knife Hex Driver 1.5mm 2.5mm Phillips Screwdriver Drill Bit - 2mm Pliers Thread Lock Aerodrive SK3 3548 840kv 6+ Channel Transmitter + Receiver 4S 4300-5000 mah 35-50C rating Spinner 64mm Thin/Thick CA LiPo Charger Aerostar 70A Electronic Speed Controller with 5A BEC (2~6S) propeller 12x8, 13x4 and 13x 6.
B’ B A’ A A=A’ B=B’ C D C=C’ D=D’ D’ C’ 3
S-2B AIRFRAME ASSEMBLY 1. Wing assembly components and hardware 2. Take the supplied small balsa block with an opening slot shown in Pic. A. Then sand the balsa block according to the shape of that supplied triangle shape template and this will perfectly match the turtle deck shape. Then stick the balsa block between the stringers (Pic. B) of the turtle deck. This will make a platform for the lock mechanism to sit on.
3. Connect some servo extension leads to your aileron servos and screw the servos into the servo bays in the lower wings using self tapping screws. Fit the ailerons to the wings using the supplied hinges and epoxy or CA glue. Ensure the ailerons move freely with no friction once the glue has set. 4. Glue the fiberglass control horns to the ailerons. Solder the supplied pushrods to the 2mm couplers then screw a ball link onto the coupler thread.
S-2B 6. First slide the wing joining rod into the wing joiner tube and secure it with 5min epoxy. Join the 2 wing halves together using 30 min epoxy and put aside until it has set. 7. Test fit the bottom wing to the fuselage and use the supplied screws and wing mount reinforcement plate to secure the wing onto the fuselage. 8. Install the rigging wire/wing mounts underneath the top wing at the center as shown.
. Install u-shaped rigging mounts to the top wing. Carefully cut open all the wing center cabane struts access holes and openings on the fuselage as shown in the pictures above. 10. Use epoxy or CA glue to secure the metal rings to the cross struts. Install the front, rear and cross aluminum wing struts as shown. Please take note, shorter tubes are located to the front while the longer ones are at the rear. 11.
S-2B 12. Trial fit the inter-plane struts to the wings. Then use the supplied screws to lock the inter-plane struts and make sure the tabs are fully seated into the wings. Ensure the top/bottom wings are straight and true to the fuselage and without any stress or distortion to the wings. Then epoxy the tabs into the wings when everything fits and lines up perfectly. 13. Undercarriage components.
15. Prepare rigging clevis assembly and attach it to the top wing rigging mount tabs, do this to both sides. 16. Thread the rigging wires through the rigging mounting tab on the top wing at the center rear. Prepare rigging clevis then attach it to the bottom wing rigging mounting tabs, do this to both sides. 17. You may also attach the aileron control linkage at this stage. Install the fiberglass undercarriage fairings on the landing gear.
S-2B 18. Insert the landing gear suspension assembly into the aluminum tube provided. Then install landing suspension struts to the landing gear as shown in the pictures above. 19. Install the landing gear axle and suspension assembly to the aluminum landing gear plate at the same time. Please loctite all the axle bolts and nuts. 20. Install the wheel pants, wheels and wheel collars. Ensure the wheels spin freely and without touching the wheel pants.
21. Hardware for the tail assembly. Trial fit the stabiliser onto the fuselage tail section. Ensure the stabiliser is true, square and level. Mark the area’s which are going to be glued on the tail section and remove the covering so that you are bonding wood with wood, not to the covering. 22. Please take note. When you use a knife to remove the covering on the stabilizer make sure you trim just inside the marks you have made so that a small amount of covering is glued to the rear fuselage as well.
S-2B 24. According to your marks use a knife to carve a slot and drill a hole for the U-shaped rod installation as shown above. 25. Epoxy glue the U-shaped rod to the elevator halves and ensure the halves stay perfectly flat without twisting whilst the glue sets. Then slide the elevator assembly into the fuselage tail section as shown. 26. Make sure the stabiliser is true and level to the fuselage and wings before you apply CA glue. Use epoxy or CA glue to hinge the elevator to the stabiliser.
27. Check the alignment of the fin then glue into place. Check alignment then hinge the rudder to the fin with epoxy or CA glue. 28. Glue the control horns to the elevator and rudder with epoxy or CA glue. 29. Solder the pushrod to the threaded coupler fitting for the rudder and elevator control linkages. Attach it to the servos as shown in the picture above.
S-2B 30. Tape a small piece of cardboard paper on the elevator and rudder to protect the film covering while you are going to work on the thread coupler soldering. Solder the pushrod to the thread coupler fitting on the other end of the push rod. Then attach it to the rudder and elevator control horns. 31 Tail wheel assembly. Assemble the tail wheel according the picture. 32. Install the tail wheel assembly and rigging mounting plate at the same time to fuselage.
33. Attach the tension spring to the rudder steering arm and the tail wheel control arm. 34. Attach rigging struts to the fin and stabiliser as shown. 35. Cowling and motor mount assembly parts. Secure the motor mount with epoxy glue.
S-2B 36. Use the method shown to locate the mounting screws holes on cowling. Then install your preferred brushless motor onto the motor mount. The motor box has a built in 3 degrees of right thrust. Make sure the motor is offset a few millimetres to the left so as to bring the motor shaft back to center of the cowl when it has been installed. 37. Trial fit the cowling onto the fuselage.
39. Glue the small white box and the white tubing fittings into place as shown. 40. Glue the pilot into place. Use silicon glue to secure the front dash board into place as shown. 41. Glue the rear dash board into place with silicon glue.
S-2B 42. Canopy locking mechanism assembly. (Picture A) (Picture B) (Picture C) 43. Sand the supplied small balsa block with an opening slot shown in picture A below, sand according to the small triangle shape template supplied in the pack. Note: Please follow picture B below for the correct orientation of the balsa blocks curvature surface. Once you have finished sanding the block it should be a perfect fit with the turtle deck.
(Picture A) (Picture B) 45. Use a sharp knife to cut an opening in the covering film according to the slot on the balsa block as shown in picture A. Glue the plastic lock mechanism to the balsa block by using epoxy as shown in Picture B. Note: Just apply enough epoxy to glue it in place otherwise excess glue may seep into the mechanism and cause it to jam. (Picture A) 46. Trial fit the plywood doubler to the canopy as shown.
S-2B Check all control surfaces are moving in the correct direction with the applicable stick input (see below) Roll left Aileron (Roll) Ailerons v+/-23mm Expo: 15-20% Roll right Pitch up Elevator (Pitch) Elevators +/-15mm Expo: 15-20% Pitch down Yaw left Rudder (Yaw) Rudder +/-25mm Expo: 15-20% Yaw right C.G. 118mm The easies way to find the balance is to pick your Pitts up under the centre of the top wing near the C of G location.
Flying tips: During take off head the model directly into the wind, hold in full up elevator and apply the throttle gently to around 50%. Make sure you keep the planes three wheels on the ground until you have good directional control on the rudder, keep it straight down the runway. Slowly bring the power up to 70-80% and release some of the elevator, the tail wheel will lift off gently from the ground followed by the model taking off.
S-2B Note 22
Note 23
S-2B Note 22
Note 23
