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Taz · 01-01-2008, 12:24 PM

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

Wayne22 · 01-01-2008, 02:43 PM

T.L.A.R. is about the closest you can come up with.

However, you don't really need one for the Giant SS..it flies just fine without it...

Taz · 01-02-2008, 11:49 AM

Thanks Wayne. Will try that.
Ted

Tex Gehman · 01-12-2008, 05:30 PM

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.

ModelBuilder · 01-15-2008, 10:56 AM

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.

wymbly1971 · 01-16-2008, 07:49 AM

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.

01-01-2008, 12:24 PM	#1
Taz RCC Junior Contributor I am: Ted H Join Date: Apr 2003 Location: Quesnel BC Feedback: 0 / 0% Posts: 234 Total Props: 3	sub fin?? Remove this ad - become a site supporter! 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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01-01-2008, 02:43 PM	#2
Wayne22 RCC Supreme Contributor I am: wayne b Join Date: Nov 2006 Location: Sh. Park, Ab Feedback: 11 / 100% Posts: 2,318 Total Props: 13	T.L.A.R. is about the closest you can come up with. However, you don't really need one for the Giant SS..it flies just fine without it... __________________ There aren't enough days in the weekend. -- Steven Wright Last edited by Wayne22; 09-15-2008 at 06:04 PM.
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01-02-2008, 11:49 AM	#3
Taz RCC Junior Contributor I am: Ted H Join Date: Apr 2003 Location: Quesnel BC Feedback: 0 / 0% Posts: 234 Total Props: 3	Thanks Wayne. Will try that. Ted __________________ Quesnel B.C.
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01-12-2008, 05:30 PM	#4
Tex Gehman RCC Contributor I am: Clarke Join Date: May 2007 Location: Winnipeg, MB Radio of choice: Futaba 7 and Spectrum DX8 # of RCs: ??? Feedback: 4 / 100% Posts: 421 Total Props: 1	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. __________________ Slime is Crime. 176 blood donations and rising! Five more years to make 200. Retired from 15 years delivering Meals on Wheels [more than 11,000].
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01-16-2008, 07:49 AM	#6
wymbly1971 RCC Master Contributor I am: Trevor B Join Date: Jan 2007 Location: Thunder Bay, Ontario Radio of choice: Taranis X9E # of RCs: 28? Feedback: 53 / 100% Posts: 1,269 Total Props: 4	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. __________________ MAAC #77168 Director - Lakehead Aeromodellers Gravity doesn't Discriminate
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01-15-2008, 10:56 AM	#5
ModelBuilder RCC Senior Contributor I am: Bill H Join Date: Jun 2004 Location: Owen Sound ON Radio of choice: DX9 iX12 DX18 # of RCs: 50+ Feedback: 5 / 100% Posts: 678 Total Props: 1	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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