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Fiberglassed foam floats

Old 03-03-2003, 11:32 PM
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beenie
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Default Fiberglassed foam floats

I decided that I was going to put my scratch built Ag-Cat on floats. It has a 46" ws, prop to rudder hinge is 31" and it weighs 3 lbs. I couldn't find many floats the size or shape that I wanted or the price that I wanted to pay. I didn't want wood floats, I didn't really feel like building and waterproofing 2 floats. Also, if I hit something, the floatation may be comprimised. So that leaves foam. All of the foam floats that I found weren't what I was looking for. Most were the Edo style and I wanted a Whipline style. So I decided to make my own. The final dimensions are: 24.5" length, 3" width, and 2.5" height at step. They have 15 degree angled sides and the V angle is 18 degrees. These figures are based on the formula on this site http://www.armoredplanet.com/hcfc/floats.html and on this page http://www.rcuniverse.com/gallery/sh...t=1&thecat=999
I chose to make them V hulled due to some bad experiences with flat bottom floats. Plus it looks better. This is a pic of the plane, there are more in my gallery.
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Old 03-03-2003, 11:54 PM
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Default Fiberglassed foam floats

The floats are made of 3 laminations of 1" pink foam, because that is what I had. They were glued together and the profile was cut on a band saw. Then I angled the saw table and freehanded the V, knowing there would be a lot of sanding. If I was using 1.5" foam, I could have cut the profle and the V at once, but where do you get 1.5" pink or blue foam? Then I set up the fence and cut the sides. There was some sanding with 100 grit and some more with 220. They are almost ready for the fiberglass. It will be glassed similar to the method that McGuiver has in his gallery. Also, I am using some of the techniques outlined by Art's Hobby. Since the Ag-Cat is really a large slowflier, much of the strength a normal set of floats needs won't be necessary. It will have a 4 or 6 oz strip at the keel, with the bottom and top covered in 1.4 oz. Then I plan to cover the entire thing in .7 oz. Will this be to much? I will be using West Systems for everything. Here are a few pics. The near float is rough and the far one has been sanded. I'll have more pics as the project progresses.
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Old 03-03-2003, 11:57 PM
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Default Fiberglassed foam floats

Also, it will have a balsa nose and triangle stock spray rails.
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Old 04-09-2015, 06:26 PM
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Roger Gray
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Hope you used epoxy resin.
Old 04-16-2015, 07:40 PM
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Whoa! That was 12 years ago!

I have a pair of 44" with fiberglass cloth and a pair of 10.5" with coffee filter paper laid over wet epoxy and then brushed smooth with more. Both cores from SeaPlaneSupply.com



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Last edited by Charlie P.; 04-16-2015 at 08:05 PM.
Old 04-22-2015, 06:24 AM
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flybyjohn
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Was going to suggest to Beenie that a thin ply plate on the last 2-3" of step would make the floats more durable, however I think his project might be finished by now.
Old 04-22-2015, 10:00 AM
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Maybe, maybe not. I have at least two that are at least 12 years in the middling stages of completion.
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