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Wings Forum
Forum for homebuilt experimental & light sport aircraft pilots, owners, & builders.
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ZENO
Joined: 06 May 2006
Posts: 1
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| Posted: Sat May 06, 2006 10:49 pm Post subject: Trim type, jackscrew or trim tab |
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I'm building a small aerobatic biplane that has jackscrew type stab trim. There are plenty of these flying, but in the interest of ease to build I would like to use a elevator trim tab. I know what the neutral position of the stab should be and the structural method of attaching the stab fixed. I planned on using a tab design similar to the Pitts and sized proportionally to the elevator sq. ft.
Am I missing other ramifications of using one type or the other...or anything else to consider?
ZENO 8) |
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billski
Joined: 30 Oct 2007
Posts: 2
Location: Saline MI
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| Posted: Tue Oct 30, 2007 9:52 am Post subject: |
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Both types work.
The jack screw method is probably heavier overall.
When you use controllable tabs, it puts more weight in the elevator, which in turn requires more mass when you balance it. Tabs are nice because you can trim with one, and tune control feel with the other one - If you want lighter forces, you rig the second one as a servo tab, and as an anti-servo tab to increase control gradients.
Billski |
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