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After creating the center point for your thrust line, create a template of the bolt pattern of your
engine from cardboard (including the center point) and use this template to drill your holes. It is
recommended to drill one single hole first, and then mount the engine with one bolt only. Mount
the cowl and confirm that the engine position is correct. Set the right thrust with large spacers.
Therefore you can use self tapping screws for the other mounting holes. Its not so easy with the
Moki mount, because the mounting holes are in an irregular positon, due to the 5 cylinder
locations.You might have to check both the center of prop shaft and distance of each valve rocker
to the inside of the cowl. If you find something
off, you still can move the mounting pattern of
the engine and drill the other holes, then fill the
wrongly drilled hole with a wood dowel and re-
drill this hole in the corrected spot.
Using M5 T-nuts the correct way from the inside
to mount your engine is not sufficient. These
will be pulled into the plywood over time and
your engine becomes lose. This can result in
fatal situations in flight. Please use large
aluminum plates or washers and glue the T-nuts
reversed on to these plates. They will distribute
the load of the bolt better to the firewall's back
side.
Now install the throttle servo and the ignition
unit inside the fuselage to the back of the
firewall. Of course there are plenty of
possibilities how and where to install both, but
please be aware that you MUST make sure that
no wire or connector can rub against the
firewall, nor touch the hot cylinders, exhaust
headers or ring exhaust. Please take great care in
perfecting your installation in this area. A small
mistake can result in the engine quitting in
flight. We have experienced this ourselves. No
cable must go through the firewall without a
rubber grommet. If you think that a radial engine
has no or very little vibration, you are very
wrong. The vibrations of a radial engine are of
different nature than the vibrations of a gas twin
cylinder engine, but they are significant and
should not be ignored. Keep cables and wires as
short as possible, fix them inside the fuselage
reliably so that they cannot lengthen or be pulled
towards the front. Test every wire that it can
under NO CIRCUMSTANCES reach a hot
engine part. Last but not least, make sure that the
ignition unit is mounted as isolated as possible,
keep batteries, receiver, servos, switches and
power leads as far away as possible.
Page 36
Instruction Manual F4U-1D Corsair
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