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90

100 110 120 130 140 150 160 170 180

Inch Scale

Metric Scale

Metric Conversions

1/2 oz. Medium CA Adhesive - (GPMR6007)*

1/2 oz. Thin CA Adhesive - (GPMR6001)

1/2 oz. Thick CA Adhesive - (GPMR6013)

CA accelerator (optional) - (GPMR6035)

CA applicator tips (optional) - (HCAR3780)

T-Pins - (HCAR5150)

Waxed Paper

6-Minute Epoxy - (GPMR6045)

30-Minute Epoxy - (GPMR6047)

Small building square or draftsman's triangle

Reinforced cut-off wheel - (GPMR8200)

Hand or Electric Drill

Drill Bits: 1/16", 1/8",13/64" or #12 

Razor Saw 

#1 Hobby knife handle

#11 Blades - (HCAR0311, box of 100)

Common pliers

Screwdrivers (phillips and flat)

Sandpaper (coarse, medium, fine grit)

T-Bar or sanding block 

Soldering iron

Silver Solder - (GPMR8070 w/flux)

Lightweight Balsa Filler - (HCAR3401)

Propane torch or heavy-duty soldering iron 
(for 60 floats only)

Double-sided foam tape - (GPMQ4442)

RTV silicone rubber

Lead weights - (GPMQ4485)

Finishing Supplies

For iron-on covering:

Top Flite MonoKote

®

film (recommended)

Sealing Iron - (TOPR2100)

For “glassing”:

Finishing resin (GPMR6049)

3/4 oz. fiberglass cloth - (HCAR5000)

Mixing cups

1" wide paint brush

Mixing sticks - (GPMR8055)

Epoxy brushes - (GPMR8060)

Fuelproof primer and paint
(Top Flite LustreKote

®

recommended)

*Items in parentheses (GPMR6007) are suggested part
numbers recognized by distributors and hobby shops and
are listed for your convenience. Our own brand has been
provided where possible: GPM 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 relatively soft, flat building board that you
can stick “T” pins into is required. This is for pinning down
individual parts that make up the completed assembly. A
suitable building board is a sheet of ceiling tile or “Celotex”
used in home construction. This material may be found at
hardware or home improvement stores. If the building
board is not flat, it must be clamped to your flat building
table. Now we're ready to begin!

During construction of the floats, most of the procedures
will have to be performed two times as there are two floats.
You may build each float individually to completion or
simultaneously build one float alongside the other.

Remove all parts from the box. As you do, determine the
name of each part by comparing it with the instructions and
the parts list included with this kit. Using a ball point pen,
lightly write the part name on each piece to avoid confusion
later. Use the die-cut patterns shown on pages 4 and 5 to
identify the die-cut parts and mark them before removing
them from the sheet. Save all scraps. If any of the die-cut
parts are difficult to punch out, do not force them! Instead,
cut around the parts with a hobby knife. After punching out
the die-cut parts, use your T-Bar or sanding block to lightly
sand the edges to remove any die-cutting irregularities.

Parts Identification

Get Ready to Build

Other Suggested Items

Suggested Tools & Building Supplies

Summary of Contents for Sport Floats

Page 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...

Page 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...

Page 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...

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

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 21: ......

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