GREAT PLANES matt chapman eagle 580 Instruction Manual page 15

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6. Glue the plywood fuel tank brace to the fuselage as
shown. The brace should be positioned against the back of
the tank.
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7. If you are installing the O.S. 81FS-a engine, you will
need to trim away the nose gear bearing on the top side of the
engine mount as shown. A rotary tool works well for this.
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8. Using four 6-32 x 3/4" [19mm] SHCS, four #6 fl at
washers, four #6 lock washers, and threadlocking compound,
attach the engine mount side-mounted to the fi rewall so that
the engine head will be on the right side. Leave the screws
slightly loose. Test fi t your engine between the mount halves.
Slide the mount halves against the sides of the engine and
fi nish tightening the mount screws.
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9. Position the front of the engine drive washer 4-7/8"
[124mm] from the front of the engine mounting box. Mark
the location of the engine mount holes onto the mount rails
using a Dead Center Hole Locator. Remove the engine from
the mount and use a 6-32 tap and drill set to create threads
in the four mounting holes. Attach the engine to the mount
using four 6-32 x 3/4" [19mm] SHCS, four #6 fl at washers,
and four #6 lock washers.
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