Composite-ARF Spitfire
10
Firewall and Engine Installation
There are many engines and
exhaust combination that will work in
the Spitfire, including a soon
available canister system for the DA
85. This is intended as a guide and
the measurements for your engine
may differ The engine we will install
in our prototype is a DA 50 with a
pitt’s style muffler and will provide
very scale performance.
NOTE
, If
you intend to use a canister exhaust
be sure cutout cooling holes in the
fuse for air to exit.
The plywood firewall is precut and
ready to install. Scuff the back side
of the plywood and the nose of the
fuse with 50 grit sandpaper. Use a
slow drying epoxy or laminating resin
to glue firewall in place. Tape and
allow to cure.
The seam in the fuse will provide us
with the vertical center line. Mark
this onto the firewall, To find the
horizontal center line, use a straight
edge on top of the fuse and measure
down 80 mm. Use a square from the
vertical line to transfer the horizontal
line to the firewall. This is the exact
center point and measurements for
the engine mounting holes will be
made from these lines. Your engine
manufacturer may have a template
you can use to easily mark your bolt
hole positions, if not this is can be
done with a few measurements.
Measure the distance of your engine
mounting holes from center to
center. Using the photo as a guide
transfer the measurement to the
firewall.
