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Old Jan 12, 2013, 08:47 PM
Thermal, where art thou?
BavarianCharles's Avatar
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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, 09:08 PM
Oleg Golovidov
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Raleigh, NC, USA
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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, 12:55 AM
G_T
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They will just give up a little efficiency in tight turns. Otherwise they should do fine.

Gerald
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Old Jan 13, 2013, 09:07 AM
Thermal, where art thou?
BavarianCharles's Avatar
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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. 10į or so.

Cheers, Charles

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Old Jan 13, 2013, 02:52 PM
G_T
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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.

Gerald
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Old Jan 14, 2013, 02:56 PM
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I've used hinged HT-08 cores aswell. Didn't run into trouble. works great.
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Old Jan 14, 2013, 04:11 PM
Thermal, where art thou?
BavarianCharles's Avatar
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Quote:
Originally Posted by robert14 View Post
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, 06:49 PM
Make Flying Fun
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United States, MD, Lutherville-Timonium
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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 !
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Old Jan 18, 2013, 09:36 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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