Great Planes PT-60 Kit - GPMA0119 - Manual (Page 13)

that F-1C is flush with the top edge of the assembly (see
sketch) This assembly must be held together with
clothespins or weighted down while the epoxy cures
D 12 Now you need to get out your drill and a 3/16" drill bit
to prepare the formers for pushrods Position each former
over a piece of scrap wood, then drill a 3/16" hole through
each of the punch marks in the die-cut 1/8" ply formers F-2
through F-5. Do not drill the F-1 assembly during this step
The top and bottom
3/16" holes are for the
standard 2 - s t r o k e
engine installation
These may have to
switch sides if using a
4-stroke engine (See
sketch at Step 2 on
page 34)
D 15 Insert a 5/16" wing dowel through the hole at the
top of F-2 Slide the die-cut 1/8" ply former F-2A onto the
dowel from the front of F-2 (that's the side with the
punched number) to check the fit Glue F-2A in position
with medium CA but don't glue the dowel to the formers
as it's only being used for alignment Carefully remove
the dowel before the CA cures
D 16 Examine your work Clean up any "fuzz" from
around the holes you drilled and also the edges of the
formers with a sanding block and 220-grit sandpaper
FIREWALL HOLE SIZES
D 13 Refer to the sketch, then drill 3/16" pushrod tube
holes through the firewall where indicated Change your bit
size to 7/32" (or better, 15/64") and drill the two fuel tube
holes through the top of the firewall Finally drill four 5/32"
holes in the firewall for the engine mount blind nuts
IMPORTANT: Position all of the formers with the embossed
numbers facing the front of the model
D 14 Insert a 6-32 blind nut into one of the holes in the
back of the firewall (F-1C) then tap it gently with a hammer
to start it into the hole Now you can either squeeze the
blind nut all the way into the firewall with a vise or finish
seating it with your hammer Put a drop of thin CA on the
outer edge of the flange to secure the blind nut in position
Repeat this operation for the other three blind nuts.
D 1 Test fit the die-cut 1/8" ply F-2 and F-3 formers in
position on the right fuse side When you test fit the
formers, be sure they line up with the bottom edge of the
lower doubler If you will be bolting on your wing the F-2A
former must face toward the front of the model If you will
not be bolting on your wing, former F-2A is not needed
Glue both parts to the fuse side as shown with medium CA
Hold the parts vertical with a triangle or carpenter's square
while the CA cures
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