Flat bottom on floats versus V-hull (Full Version)

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Rufcut -> Flat bottom on floats versus V-hull (5/16/2008 3:10:39 PM)

I am going to hot-wire cut some foam floats for my Tiger Trainer 60 this weekend and I was wondering if it's worth the trouble to cut a V-hull or just leave the bottom flat. Is one or the other better in terms of take-off and landing characteristics? Also, can I just apply fiberglass over the foam? Any help would be appreciated.

Thanks,
Rufcut




Chip_Mull -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:22:33 PM)

There are no flat bottom full scale floats. For sport they work great! It's just like the Seamaster hull.




cf-drg -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:31:24 PM)

Flat bottoms are fine.. Most of the foam pre-cuts kits are flat bottom.. As far as glassing, use a .5 or .75oz and epoxy for resin.. Polyester resin loves eating most kinds of foam.. The one I use is West Systems Epoxy, nice stuff....




Rufcut -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:34:49 PM)

Thanks Chip.
My plan was to cut the bottom flat and apply glass to the float, sand, paint, and install. I've never flown off water but it looks like such a kick, I just have to try it.




siddus74 -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:35:33 PM)

IMO the V shaped floats tend to work better, I had flat bottom floats on a cub and a mono float flat bottom float on a fun fly and they tended to wander on take off and fast taxi on step . . . When I then added the V bottom every thing improved with regards the traking. On solid foam I would use contact adhesive such as Copydex to glue 1/16 or 3/32 balsa to the bottom V, sides and top after inlaying some ply for the wire mounts to screw to, then cover the entire assembly with a good quality film ensuring that any joins are painted with Prymol or better still very light weight wing skinning cloth and resin, then prime and piant with a light coat of enamel . . .

Better still build a float plane as they handle on the water better still and are the correct shape by default . . . I tried various land planes on floats and while they seemed to fly ok the extra setting up the lake and having to compromise on the amount of models I can take because floats take up so much room pushed me towards boat planes . . . Catalina's and Seamaster's look better in the air IMO and also floats can make a great land plane feel spongy and heavy in flight . . . Just my thoughts.

Good luck!




Rufcut -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:50:51 PM)

Thanks cf-drg,
I have some automotive glass cloth that I was going to use and apply it with water base polyurethane. Weighs about 6 oz. per square yard. Think that will be too heavy? What weight should I shoot for on a pair of 40" long x 4" wide floats?

Thanks again
Rufcut




goirish -> RE: Flat bottom on floats versus V-hull (5/16/2008 3:54:36 PM)

I would use the 1/2 or 3/4 with the H2O Poly. I did a set of floats for my Dehavilland Beaver using this method and it turned out great. After you wet the cloth be sure to scrape off the excess. I use a old credit card. I also used the 3/4oz.




evan-RCU -> RE: Flat bottom on floats versus V-hull (5/16/2008 9:39:04 PM)

Cut them flat and sand a slight V into the front. It'll be worth it.




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