FlyingBalsa MKII Humpback Instruction Book Download Page 12

19) 

Continue sheeting the top of the 

fuselage stopping at the point where the 
horizontal tail will go. Remember, there 
is enough sheeting supplied with the kit 
to sheet the top and bottom of the 
fuselage but you cannot be wasteful 
with the wood. Once the upper sheeting 
is all glued on, reinstall the pylon hatch 
with the nylon screws for the next step.

20) 

Using a #43 drill bit ream the two holes of the hatch tongue 

and two of the holes at one end of the tank hatch. Break the 
toothpick in half. Glue the hatch tongue to the hatch using the 
toothpick halves through the reamed holes as an alignment aid. 
Trim toothpicks and sand smooth on both sides. 

21) 

Position the tank hatch on the fuselage with a small gap 

between the tank and pylon hatches using the method when you 
sheeted the upper fuselage. 

Note: there will be about a one inch 

gap at the front of the hatch. This is normal. 

Carefully mark 

the two screw positions for the tank hatch. It is recommended 
that you drill and tap each hole one at a time the same as was 
done for the pylon hatch. Remove the hatch then drill and tap the 
plywood mount for the 8-32 nylon  hold down screws (#29 drill 
bit). Ream the two screw holes in the tank hatch for a slip fit of 
the the 8-32 screws (#18 drill bit) and then screw the hatch in 
place for the next step.

22) 

The forward fuselage filler piece is the 1/8 x 1-1/2 x 4 balsa 

piece in the wood bag. Simply glue it to the top of the forward 
end of the fuselage (at the firewall) with a gap between it and the 
tank hatch. Use the folded paper as before. 

Caution: Do

 

  not glue

 

  

F3 to the tank hatch tongue! Glue to the fuselage sides and 
firewall only! 

 It is intentionally oversize so it can be sanded 

flush with the fuselage sides and firewall.

With both hatches installed, the fuselage can now be sanded 
smooth for covering.  Note that you will sand off the excess 
material from F-3, the wire trap, and the 1/8” balsa top and 
bottom sheeting. Round all edges to approximately 1/8” radius.

10

Summary of Contents for MKII Humpback

Page 1: ...very tight and performance is duplicated kit to kit We recommend seeking help from the local modelers in your area if you are inexperienced Orientation could be your toughest challenge We hope you enj...

Page 2: ...tal stabilizer 4 Vertical stabilizer 4 Fuselage 5 6 7 8 9 10 11 Pylon 12 13 Tail installation 14 Tail wheel rudder main gear 15 Radio installation 16 Motor installation 17 Control surface rigging 17 R...

Page 3: ...Doubler Doubler Fin Elevator Elevator Horizontal stabilizer Rudder Fuselage filler plug Battery Hatch Pylon Hatch F 2 F 1 Tongue Wire Trap Pylon Core Pylon Support Tail Wheel Mount Hatch Supports Pylo...

Page 4: ...ws 3 4 40 x 3 4 socket head blade bolts 3 4 40 self locking nuts 3 nylon rotor blade bushings 3 4 flat washers for blade bolts 2 6 flat washers for main landing gear wire 2 5 32 wheel collars for main...

Page 5: ...odelers tools we recommend the following Square for squaring formers and general usage 3 32 drill bit for reaming gimbal pivot hole 5 32 drill bit for drilling the landing gear torque blocks 29 drill...

Page 6: ...urface Simply glue the elevators to the horizontal stabilizer as shown in this photo Use thin CA glue The elevators are fixed and do not move on this model Sand the horizontal tail assembly for film c...

Page 7: ...lled on the left side Remove the servo filler plug from the tail card sheet and glue it into the servo cut out hole on the side you DO NOT want the servo to be on Use thin CA glue You will need to jus...

Page 8: ...glue cures Note that it fits into the space formed where the plywood doublers end Align the firewall with the top of the fuselage sides It will extend slightly below the bottom of the fuselage and wil...

Page 9: ...CA glue This piece will give support to the 1 8 balsa upper fuselage sheeting which will be installed in a later step Now the lower pylon support can be secured with thin CA glue 12 The 1 8 lite ply w...

Page 10: ...4 Place the completed fuselage sub assembly on the line you drew on your building board Ensure that the small notch on the bottom of the firewall and formers F 1 and F 2 are directly over the drawn li...

Page 11: ...at same hatch hole with a 18 drill bit for a clearance of the 8 32 nylon screw Reinstall the pylon hatch assembly and secure with a 8 32 nylon screw in the hole you just tapped Repeat the drill and ta...

Page 12: ...arefully mark the two screw positions for the tank hatch It is recommended that you drill and tap each hole one at a time the same as was done for the pylon hatch Remove the hatch then drill and tap t...

Page 13: ...accomplished using a 21 drill bit in a battery powered drill 24 Cut a hole for the motor wires approximately 1 2 in diameter just aft of the landing gear mount Also cut a battery cooling vent approxi...

Page 14: ...ference mark on where to apply the epoxy glue The entire fork assembly can be done in one setting using 15 minute epoxy glue The holes for the 1 8 dowel fork pins are all pre drilled Apply epoxy to th...

Page 15: ...ilm covering but you will need the special Monokote type of trim tool to accomplish this Another option would be to simply paint the inside surface of the forks Leave the bottom end of the pylon sides...

Page 16: ...e fin and rudder 33 Test fit the horizontal stabilizer to the fuselage and carefully remove the film covering from the stabilizer bottom where it gets glued to the fuselage Glue the vertical fin to th...

Page 17: ...he tail wheel wire into the rudder Insert the three rudder hinges into the slots of the rudder There is no easy way to accomplish the next step You will just have to work methodically and carefully in...

Page 18: ...rect to prevent binding The upper servo is for roll control and the lower servo is for pitch control Simply install the rubber grommets and brass eyelets and then using the screws supplied with the se...

Page 19: ...Re install the pitch and roll servo control wheels as shown in Figure 1 of step 39 Drill a 3 16 hole in the pylon hatch for the 4 40 pushrods as shown on the CAD drawings If you are using different se...

Page 20: ...e and flush with the top and bottom of the blade TIP temporarily installing a blade bolt through the bushing is an excellent alignment aid for ensuring the bushing is square to the blade When satisfie...

Page 21: ...Initial Radio Setup 46 This section outlines a basic setup procedure This will give you a basic starting point that can be fine tuned during your test flights 46 1 Throttle glow engine conversion rig...

Page 22: ...takeoff run When you are at half power pull a very small amount of aft stick until the blades enter auto rotation and when the wheels are light pull a little more aft stick until airborne and add powe...

Page 23: ...ort or parts flyingbalsa bellsouth net Yahoo groups support forum http groups yahoo com group ptgyrosupport FlyingBalsa LLC PO Box 1491 Collierville TN 38027 If you purchased your kit through a retail...

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