FUSELAGE ASSEMBLY, PART I: Engine Mounting
For the following steps you will need these parts:
•
1 - Fuselage
•
2 - Glass-Filled Engine Mounts
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4 - M3 x 20mm PH Bolts
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4 - M3 Flat Metal Washers
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4 - M3 Split Lock Washers
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1 - Engine and suitable engine mounting Bolts (not supplied)
❑
1) Bolt the Engine Mounts in place on the front of the firewall
using the M3 x 20mm Phillips-Head Bolts, Flat Metal Washers, and
Split Lock Washers provided.
❑
2) The 1-5/8" vertical spacing between the mounting bolts, along
with the slotted holes in the engine mounts, allow the engine
mounts to accomodate any engine that has a crankcase width
between 1-1/8" to 1-9/16". That should cover any engines within
the recommended size range for the Mayhem 40.
❑
3) a. Move your engine forward or backward on the engine
mounts until you measure exactly 4-5/8" from the front face of the
prop drive washer to the front of the firewall. This is the distance
your engine needs to be from the firewall for proper cowl
7
❑
4) Glue the Plywood Wing Bolt Plate in place on the bottom of
the wing, carefully aligning the two 1/4" holes in the plate with the
holes in the wing before the glue dries. Make sure there is no
excess glue inside the holes. If necessary, run a 1/4" dia. drill bit
through the holes after the glue is completely dry.
❑
5) Now permanently glue the Fuselage Bottom Fairing onto the
bottom of the wing with thick CA or epoxy glue. Let dry.
❑
6) a. Bolt the wing back in place on the fuselage. Locate the two
Fiberglass Wing Bolt Guides and fit them into the wing bolt holes
in the bottom fairing. The guides should slip into the holes and go
all the way down against the surface of the wing and around the
head of the wing bolt.
b. Once you have the wing bolt guides fitted in place, use a
little thin CA glue to adhere them to the bottom fairing. Let dry.
c. Use a sharp hobby knife to trim the excess wing bolt guide
off flush with the bottom fairing. Don't try to take it all off with one
deep cut - cut off small pieces at a time. By working slowly and
carefully, you can get it trimmed off without gouging or cutting into
the bottom fairing.
d. With the wing removed from the fuselage, and the wing
bolts removed from the wing, put a few drops of thin CA glue in the
bottom of the wing bolt guides to bond them to the surface of the
wing. Don't use too much.