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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA
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 Posted: Sun May 25, 2008 2:38 pm Post subject: Electric Trim Travel...? |
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Dear Listers,
Working on my RV-4 electric trim, I don't seem to find anywhere where
the actual UP and DOWN travel amounts for the trim tab are called
out. I built the Mac Trim servo installation more or less per the
plans, and I'm getting about 1" UP and 7/8" DOWN travel measured at
the outboard end of the tab with respect to the trailing edge of the
elevator. I've included a couple of pics for reference.
With an O360 and CS Prop, will this be sufficient trim throw?
Thanks for the help!
Matt Dralle
RV-4 N442RV
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Matt Dralle
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ssamps(at)gmail.com
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| Posted: Wed May 28, 2008 12:43 am Post subject: Electric Trim Travel...? |
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Matt - I never found instructions on that point either.
It struck me that on the first flight you want to be able to trim for slow flight, approach, so that requires more than normal up elevator, trim tab down. So I adjusted mine with a little extra down rather than up. I havnt flown the -4 yet though, so I have no confirmation that I did the correct thing.
As to throw, when I built my -9a the movement in the cruise around the centre was minimal, it caused me to include a gizmo to slow the trim down on the -4. The only time I saw significant movement from the middle was CofG forward trimming for approach. (Trim down.)
Cheers, Steve.
2008/5/25 Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>:
[quote]
Dear Listers,
Working on my RV-4 electric trim, I don't seem to find anywhere where the actual UP and DOWN travel amounts for the trim tab are called out. I built the Mac Trim servo installation more or less per the plans, and I'm getting about 1" UP and 7/8" DOWN travel measured at the outboard end of the tab with respect to the trailing edge of the elevator. I've included a couple of pics for reference.
With an O360 and CS Prop, will this be sufficient trim throw?
Thanks for the help!
Matt Dralle
RV-4 N442RV[b]
| | - The Matronics RV4-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV4-List |
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