Great Planes Float Kit 60 - GPMQ1874 - Manual (Page 16)

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5. The completed struts may be painted. First remove all
residue with alcohol, thoroughly sand with 400-grit
sandpaper, then clean again with alcohol or thinner
before painting.
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1. Mount the struts to the floats with 3/16" wheel
collars and 6-32 machine screws. Then tur n the
fuselage upside-down and place the struts on the model
with the “step” in the floats positioned according to
the recommendations.
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2. Place three 5/32" nylon hump straps, evenly spaced,
on each strut and mark the screw hole locations. Drill a
3/32" hole at each mark, then fasten the floats to the
fuselage with 12 #4 x 1/2" sheet metal screws.
If you are building the 60 floats, skip to “Build the water
rudder” on page 17.
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1. Cut the nylon bearing mounts into two pieces and
mount them to the floats with 4-40 x 1/2" screws. If your
front landing gear is 3/16" diameter wire, you will have to
drill out the front bearing mounts with a 13/64" or #12 drill
bit. See the following photo for proper bear ing
mount placement.
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2. Temporarily join the floats to the struts with the 5/32"
wheel collars.
The following instructions show the Great Planes J-3 Cub
20 and 40. Use the instructions, sketches and photographs
as a general guide if you are mounting the 20 or 40 Sport
Floats to a different model.
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1. Turn the fuselage upside-down and place the front
struts in the torque blocks in the fuselage and the lay rear
struts on the aft strut mount plate.
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2. Mount the front struts to the fuselage as they were
with the conventional landing gear, then place two nylon
5/32" hump straps on the rear strut 3/8" from the fuselage
side. Mark the strap locations. Note: The 40 Sport Floats
require a third hump strap in the center of the rear strut.
❏
3. Drill 1/16" holes at each mark. Then fasten the float
struts to the fuselage with #2 x 3/8 sheet metal screws.
❏
4. The completed struts may be painted. First remove all
residue with alcohol, thoroughly sand with 400-grit
sandpaper, then clean again with alcohol or thinner
before painting.
Mount the Floats to the Airplane
Mount the Struts to the Floats
20 AND 40 FLOATS ONLY
Mount the 60 Floats to the Airplane
16