Dynaflite GPMA0090 Butterfly - Manual (Page 20)

20
❏
9. Use the above die drawing of the fuselage parts
to mark each part with a ballpoint pen exactly as
they are shown. This will insure proper orientation
of the formers during construction.
❏
10. Use medium CA to glue the notched aft
fuse side joiners ( F-1 ) to both fuselage sides so
the front edge of the notches in the joiners are 1/4"
ahead of the front edge of the notches in the fuse
sides as shown in the photo.
❏
11. Use a ballpoint pen and a straightedge to
draw a line connecting the punch marks on the
front of F-4 to indicate the position of your engine
mount. Draw two vertical lines (with the grain of
the wood) on the
back of F-4 1/8" from each side
to indicate the position of F-5.
❏
12. Glue F-5 to F-4 with epoxy so the edges of
F-5 align with the lines on the back of F-4 and the
top edges of F-4 and F-5 are even. From now on
this assembly will be referred to as the “
fi rewall .”
Make certain that the “F-4” and “F-5” designations
you marked are in the same orientation. If the parts
are slightly warped, clamp them to a fl at table or
board with wax paper between the board and the
parts. Wipe away excess epoxy before it cures.
❏
13. Center the engine mount (not included) on
the fi rewall so the “rails” align with the horizontal
line. Use a piece of wire sharpened at one end to
mark the location of the engine mount holes on the
fi rewall. Remove the mount and drill 1/8" holes at
the marks to fasten mount with 4-40 x 1/2" machine
screws and 4-40 blind nuts (not included). We used
a Hayes 061 KM-15 engine mount (HAYG1061)
on our prototype.