Score along the edge of the raised
area with a hobby knife. Continue
scoring strait down until you have
connected the two holes.
On the underside of the slot, bevel
the rear end (stern end). These bevels
allow the Stern Tube to lay in the slot
without binding.
Use the hobby knife to bevel the front
end (bow end) of the top of the stern tube
pass-through slot.
Fill the Stern Tube with your favorite
lubricant. Greases seal well but can
cause a lot of drag on the motor.
Thinner lubricants cause less drag but
may need refilling more often.
Lay out the drive line. For
competition, Crackerboxes require a
“R.O.A.R. Legal” motor. Brushless
R.O.A.R. setups are available.
White lithium grease, or a synthetic
grease works well. They can be thinned.
Push out the excess grease by inserting
the Drive Shaft. Clean any excess grease
from the Stern Tube with solvent.
The holes should line up with the
round ends of the raised area. View
is from the tray underside.
9
67
68
69
Straighten the Turn Fin. Fill the recess
with filled-epoxy.
70
Press the fiberglass cloth into the epoxy
until it is saturated. Check the alignment
of the Turn Fin
frequently
until it cures.
71
72
Reinforce the Turn Fin installation by
laying a scrap of fiberglass cloth, or
other material, into the epoxy.
73
After the Turn Fin epoxy cures, install
the drive train. Drill two 7/32 inch
holes on either end of the raised area.
74
75
76
77
78
Hold the Turn Fin at an angle and
push filled-epoxy under its flange
until it appears behind the holes.
