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ABS:
Use a silicone-based sealant to fill the hole around the stuffing box. BE SURE TO
CHECK THAT THE SEALANT YOU SELECT IS COMPATIBLE WITH PLASTICS.
More than one person has found out the hard way that they picked the wrong one!
12)
Epoxy or CA scrap 1/8” plywood to fill the areas between the hull and the stuffing box.
This will greatly strengthen the connection, and is very important for the hull to be
tunable for proper operation. It is also recommended that you use small pieces of
fiberglass cloth.
13)
Mount the Graupner skid fin bracket on the right sponson as far outboard as possible,
angled so that the fin is about 5° from vertical. You will need to drill pilot holes for the
mounting screws (use #4 self- tapping or 4-40 machine screws after tapping). This is a
tight fit on the fiberglass boat, but on the ABS it is not a problem. You may want to
remove a small amount of the skid fin mounting bracket in order to be able to set the fin
higher on the sponson transom, in order to make the entire edge of the fin sharp where it
is in the water.
14)
Locate the rudder bracket on the transom to the left of the propeller, situated such that the
mounting holes will be drilled about 9/16” from the outside edge of the transom (see
figure above). Take some forethought for how to route the pushrod from the servo. The
rudder mounting bracket will need to have new holes drilled into it to accept the smaller
transom of the UL1. The two new holes should be drilled so that they pass through the
cut-out section on the mount ing side of the bracket.
The prototype fiberglass boats were modified by adding a fairing in front of the rudder
bracket to make the lines smoother. While this is not scale, it does enhance appearance.
If you are using an alternate rudder, this fairing becomes unnecessary.
15)
NO RADIO BOX:
Install your radio gear per your preferences. It is recommended that
the rudder servo be located in the rear compartment as close as practical to the transom,
and that a 1/8” ply doubler be added to the inside of the hull. This will help prevent
flexing of the pushrod and hull under high stress (see drawing below).
RADIO BOX:
Install the radio gear in the radio box at the appropriate locations. The
actual position depends upon the type of radio equipment you use.
9/16"
5/16"
