Fei Bao MB-339 Instruction Manual - page 12
12
Step 9: Aft Fuselage
Drill a hole in the pipe mounting tabs at their mid-point.
Position the pipe on the rear of the lower bypass. The tabs are
slightly offset to one side of the pipe … this is the top.
With the pipe fully on the lower bypass, and the mounting tabs
equally spaced from the top, drill holes through the lower bypass
for the tab mounting bolts.
Trim the mounting tabs back a bit if necessary to insure they
don’t interfere with the fit of the upper bypass.
Insert the pipe into the aft fuse.
Attach the aft fuse to the forward fuse with four bolts. Loctite.
Secure the wire harness to the side of the fuse to keep it away
from the pipe (
photo 21
).
photo 21 – mounting aft fuselage
Step 10: Engine and Pipe
Clean the fuselage thoroughly before installing the engine. If you
need to trim the intake for engine clearance, use a vacuum while
you work. This will reduce the chance of a foreign object finding its
way into your engine.
Move the pipe aft and position the lower bypass on the
mounting rails. Trim the engine rails as necessary for a good fit.
Bolt the pipe mounting tabs to the lower bypass.
Position the aft end of the exhaust pipe even with the lower fuse
at the rear exhaust opening. (
photo 22
).
Trim the intake such that it extends inside the lower bypass by
approximately ¼ inch.
Slide the pipe/bypass assembly to the rear again, and slip your
engine into the lower bypass. Move the entire assembly forward
into position.
photo 22 – position of aft pipe
Adjust the location of your engine to obtain the clearance
specified by the manufacturer between the exhaust cone and
the pipe mouth. It is likely it will extend into the intake.