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Old Jan 12, 2013, 09:47 PM
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HT08 Hinged?


Kevin Sharbonda cut me a batch of very nice horizontal tail cores using an HT08 airfoil. Problem is, I should have ordered HT22, since they're intended for a hinged horizontal!

Has anyone hinged an HT08 tail and if so, how did you like the result?

Cheers, Charles

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Old Jan 12, 2013, 10:08 PM
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Oleg Golovidov
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Considering that we used flat plate balsa tails a few years ago, and it was pretty normal and worked wonderfully, why are you concerned about having a hinged HT08 tail?
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Old Jan 13, 2013, 01:55 AM
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They will just give up a little efficiency in tight turns. Otherwise they should do fine.

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Old Jan 13, 2013, 10:07 AM
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Quote:
Originally Posted by G_T View Post
They will just give up a little efficiency in tight turns. Otherwise they should do fine.

Gerald
Tight turns in AZ normally take place in high-energy thermals, aka dust devils, so less efficiency shouldn't matter. Just wanted to make sure that they don't drop off a cliff above a reasonable deflection, i.e. 10° or so.

Cheers, Charles

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Old Jan 13, 2013, 03:52 PM
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You can improve the situation a little once you have it trimmed out. Shim the fixed portion to be very slightly nose down, so that once retrimmed, it looks like it is flying with perhaps a degree of down elevator. That lessens the up elevator required compared to the native airfoil and will drop the drag slightly in tighter turns.

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Old Jan 14, 2013, 03:56 PM
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I've used hinged HT-08 cores aswell. Didn't run into trouble. works great.
Old Jan 14, 2013, 05:11 PM
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I've used hinged HT-08 cores aswell. Didn't run into trouble. works great.
Cool - can you share the planform and hinge-line location?

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Old Jan 14, 2013, 07:49 PM
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Tail Foill tables from CharleRiver ...

http://www.charlesriverrc.org/articl...t-airfoils.htm

As Oleg stated, I've hinged many full flying stab foils and they work fine !
Last edited by KevinSharbonda; Jan 15, 2013 at 07:52 AM.
Old Jan 18, 2013, 10:36 AM
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I really need a set of tail feathers - bagged hinged whatever - i have an xp4 kit that needs building - yes u read that correctly.... i guess the balsa stuff is worth upgrading ...is there someone on rcgroups that sells them? - i see them from time to time in the classifieds but man they last like 5 minutes ! spent a lot of time reading the single cell thread and topdrive servos is a new thing for me and i like that idea a lot (have seen Oleg's validol installation man that is sweet) ...

a lot has changed in my 5 yr absence - should be fun...sorry for the minor drift there


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