Great Planes Extra 300S 60 Kit - GPMA0236 - Manual (Page 22)

❏ 1. Use 30-minute epoxy to glue the firewall formers A,
B and C together. Make sure the embossed label on A is
facing UP and the top edge and tabs on all three formers
are aligned. Wipe away excess epoxy before it cures. From
now on this assembly will be referred to as the firewall.
Note: If the formers are warped, simply clamping them
together may not “cancel out” the warps. It is best to clamp
the formers to a table or a flat board until the epoxy cures.
❏
2. Lay the two fuselage sides (part #1) next to each
other as shown in the photo and label the insides as the
LEFT and RIGHT. It is important that you lay the fuselage
sides in a mirrored position to insure that you build a right
and a left side.
❏
3. Fit former 7 (part #7) in place on the right fuse side.
Butt the fuse doubler (part #2) up against former 7 and
mark around the perimeter of the fuse doubler.
❏ 4. Use medium CA to accurately glue the fuse doubler
(part #2) to the inside of the right fuselage side. Do not
glue former 7 in place at this time.
❏
5. Glue the left fuselage doubler to the inside of the left
fuselage side in the same manner.
❏
6. Drill a 3/16" hole through each of the punch marks in
formers 9 and 10.
Hint: Place the formers on a leftover piece of wood and
press down as you drill the hole so the former does not split
when the drill goes through.
❏
7. Draw center lines connecting the outer punch marks
on the firewall. Drill 7/32" holes for the engine mount bolts
at the four engine mount punch marks. Drill a 3/16" hole for
the throttle pushrod at the punch mark. Drill two 15/64"
holes for the fuel tubes.
❏
8. Press four supplied 8-32 blind nuts into the holes on
the back of the firewall. Gently tap the blind nuts with a
hammer to fully seat them into the firewall, then add a few
drops of thin CA around the blind nuts to secure them.
❏
9. File off the 1/64" of the blind nuts that extend above
the top of the firewall.
Assemble the Fuselage
Formers & Sides
BUILD THE FUSELAGE
22