.
b. Bolt the bottom wing to the fuselage with the two 1/4-20 nylon bolts. Bolt the interplane struts to the outside of the bottom
wing strut mounts with four 4-40 x 3/8” socket head capscrews and #4 washers. Do not tighten the bolts yet.
c.
Bolt the top wing to the cabane with two 8-32 x 1” nylon screws. Make sure the interplane struts are on the outside of the
top wing strut mounts. If everything is correct, the interplane struts should line up with the center of the top wing strut
mounts without forcing anything. Using the top wing strut mount as a guide mark and drill a 7/64” hole in the top center
edge of the interplane strut. Bolt the interplane struts to the top wing strut mounts with two 4-40 x 3/8” socket head cap
screws and #4 washers.
76
a.
Using the two 8” 4-40 threaded rods thread a 4-40 nut and clevis on one end and a 4-40 size solder clevis on the other.
Snap the threaded clevis onto the bottom left aileron interconnect horn.
b.
Tape the top ailerons in neutral position, turn on the radio and center the bottom ailerons. Then solder the clevis at the top
aileron, interconnect horn to establish the correct length of the aileron interplane pushrod.
c.
Repeat steps 76a. through 76c. for the right aileron interplane pushrod.
Final Points
77.
Install all the radio equipment and check the balance of the completed aircraft. If you need to move the balance point the
battery pack is the heaviest moveable item. If this is not enough you might try moving the receiver - or horrors, add a little
lead in the appropriate spot.
DO NOT FLY WITH THE AIRLANE TAIL HEAVY - YOU WILL PROBABLY CRASH.
The balance points or centers of gravity (CG), measured from the leading edge of the top wing, are:
25% 3-5/8” Good place to start if this is your first biplane.
30% 4-1/8” Better elevator response and quicker snaps.
35% 4-5/8” Approach this CG with precausion. Unexperienced pilots may find this to be to extreme for their ability.
For the first flights it would be a good idea to have the Hogbipe balanced at a more forward CG rather than a reaward CG.
The control throws are as follows:
Aileron; 5/8” up and down
Elevator; 3/4” up and down
Rudder; 1-1/4” left and right
After quite a few flights the SIG Factory Flyers have settled on these throws as a comfortable starting point. None of these
throws will result in a dangerously slow response, nor will you find the controls too wild. After a few flights you may decide
you want to change the response of one or more controls or to change the CG.
By all means do so, but be careful, it’s entirely possible to make the Hog Bipe unmanageable by either a too rearward CG
or too much control throw or a combination of both.
STOP,
before you go out and fly your new
Hog-Bipe, make one last check of the
airframe. Did you forget anything along
the way that might have an adverse
affect on the first flight? Plug in the
charger and give it a little time while
you review your handiwork. Look over
the airplane very carefully and be
critical - did you screw up anything?