background image

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.

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.

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.

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.

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.

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.

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

Содержание Sport Floats

Страница 1: ...be assumed nor accepted for any damage resulting from the use by the user of the final user assembled product By the act of using the user assembled product the user accepts all resulting liability I...

Страница 2: ...andling characteristics on the water and ultra smooth realistic takeoffs Of course the Great Planes Sport Floats will work well with other models too The 20 40 or 60 Sport Floats may be properly assem...

Страница 3: ...M is the Great Planes brand HCA is the Hobbico brand TOP is Top Flite IMPORTANT For your model to handle properly on the water and in the air the Sport Floats must be built on a flat surface Also a re...

Страница 4: ...4 DIE CUT PATTERNS 60 SIZE...

Страница 5: ...5 DIE CUT PATTERNS 20 SIZE 40 SIZE...

Страница 6: ...re it fully cures 1 Trial fit the die cut 3 32 balsa upper float side lower float side and aft float side Make adjustments if necessary When satisfied with the fit use thin CA to glue the three pieces...

Страница 7: ...eck from former C forward 5 Lay waxed paper over your flat building board and position all the formers except A and I on the deck Make sure the notches in the formers fit all the way down to the deck...

Страница 8: ...ng photo 3 Cut a 3 16 x 3 16 forward stringer to fit in the notches of formers E to A do not attempt to bend the stringer down to the notches in former A at this time Use a pen to make marks every 1 2...

Страница 9: ...the center and should be placed so it covers half of the keel Make adjustments if necessary and bevel the edges of the aft bottom sheets that contact each other in the center Note An embossed arrow i...

Страница 10: ...d arrows to aid in final alignment 4 Referring to the sketch rough sand the entire float with a sanding block and 150 grit sandpaper blending the sides to the deck and the bottoms to the side Sand all...

Страница 11: ...rototype 60 floats mounted on our Great Planes J 3 Cub 60 are covered with MonoKote film and were really put to the test Following are instructions for both covering methods 1 Seal all seams except ar...

Страница 12: ...ing you may do the top and sides first then the bottom If you work quickly you can save the paint brush by cleaning it with alcohol before the resin begins to thicken 7 Carefully sand the entire float...

Страница 13: ...this yields a slight positive wing incidence in relation to the floats and the airplane will tend to rise off the water at the correct time If you have a model with a symmetrical wing the wing incide...

Страница 14: ...solder 1 Match the shorter front strut with the front cross brace and the taller rear strut with the rear cross brace The matching struts and cross braces are the ones that fit together the best Note...

Страница 15: ...hem with a 12 or 13 64 drill bit Mount the bearings to the floats with 4 40 x 1 2 screws 2 Temporarily join the floats to the struts by inserting them into the bearing mounts Use a felt tip pen to mar...

Страница 16: ...per bearing mount placement 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...

Страница 17: ...n the nylon swivel 1 8 past the end 4 Loosely install the rudder on the right float with two flat straps two 1 8 hump straps and four 2 x 3 8 sheet metal screws Adjust the bottom of the rudder bracket...

Страница 18: ...de tube to the aft strut with a nylon tie 8 Drill a 1 16 hole and secure the cable guide tube to the mount plate with one of the cut off hump straps and 2 x 3 8 sheet metal screws 20 40 Floats only Af...

Страница 19: ...rewing the nylon clevis at either end of the cable 8 Mount another 1 8 plywood mount plate and the other cut hump strap near the rear of the guide tube 9 Test the actuation of the water rudder on the...

Страница 20: ...g around in the water to learn the handling characteristics and see if you have built in enough throw on the water rudder Make adjustments if required During taxiing hold up elevator to keep the nose...

Страница 21: ......

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