sub fin?? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-01-2008, 12:24 PM   #1
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sub fin??

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I have a giant Sportster which will have a set of floats mounted on it. A friend said it would be advisable to put a sub fin on it. Is there a formula to figure out the size I need.
Thanks Ted
Quesnel B.C.
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Old 01-01-2008, 02:43 PM   #2
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T.L.A.R. is about the closest you can come up with.

However, you don't really need one for the Giant flies just fine without it...
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Last edited by Wayne22; 09-15-2008 at 06:04 PM.
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Old 01-02-2008, 11:49 AM   #3
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Thanks Wayne. Will try that.
Quesnel B.C.
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Old 01-12-2008, 05:30 PM   #4
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Also. should directional stability become a problem and if you switch the plane back and forth with wheels, consider just putting fins on the top-rear of the floats. OK, not scale, but neither is the plane. Tex.
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Old 01-15-2008, 10:56 AM   #5
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That's a good question. I don't like the appearance of a dorsal. A lot of flyers seem to just pass on it.

I've seen guys use thin lexan for a dorsal. It really can't be seen but is quite effective.

An enlarged vertical stab was used on Aeronca Champs and a some Wacos and others.
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Old 01-16-2008, 07:49 AM   #6
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Sub Fin

I fly a big trainer with floats and don't have a sub fin. I'm also building a Norseman and have no intention of putting a sub fin on it. I think they look funny, especially when used on a scale model that doesn't normally have one.

I'd say 90% of the float flyers in our club don't use them, either.

I don't find that they're neccessary. I do find, however, that I need to use a bit more rudder to make a nice turn.

Sorry, I guess that doesn't really answer your question, does it? 'Just my $0.02 worth.
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