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05-28-2012, 03:55 PM
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Join Date: Apr 2012
Location: Lincoln, NE
Posts: 34
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Advantage of electric trim
Are there any advantages to electric elevator trim that justify the added cost and added aft CG weight?
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Jerry
RV-4 (999ZF) flying
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05-28-2012, 04:23 PM
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Join Date: Feb 2011
Location: Brisbane, Australia
Posts: 37
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I thought the electric trim was lighter than the manual cable assembly?
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05-28-2012, 05:02 PM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Quote:
Originally Posted by Flyin4Fun
Are there any advantages to electric elevator trim that justify the added cost and added aft CG weight?
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Aside from being lighter as previously mentioned, the electric trim also preserves pass through space in the spar box - the manual trim cable is thick; the 22g wires for the electric trim are tiny in comparison. Depending on how you equip your plane, space to pass wires through the spar box may be very valuable.
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Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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05-28-2012, 05:04 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Quote:
Originally Posted by Flyin4Fun
Are there any advantages to electric elevator trim that justify the added cost and added aft CG weight?
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Right question. Take monetary difference between the two and divide it by $5.80 then figure out how far your RV can reach for that difference. As you see there is no advantage.
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05-28-2012, 05:06 PM
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Join Date: Mar 2010
Location: Newcastle, OK
Posts: 169
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There could definitely be an advantage to the resale value of your airplane.
I hear it can add 5 knots to your cruise speeds and 100fpm in sea level climb speed at Vx. 
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Tyler
Newcastle, OK
N825TC
RV-14A #140754
Project Log
Last edited by pilottangocharlie : 05-28-2012 at 05:10 PM.
Reason: Insert sarcastic remark
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05-28-2012, 05:19 PM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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Practical benefit of electric trim is HOTAS ergonomics. Downside is more parts count. If I had to do it again I would probably just put electric trim on the pilot's side. Wiring trim to one set of switches eliminates the need for relays (if your switches are rated for the draw of the motors which I believe most are).
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"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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05-28-2012, 06:59 PM
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Join Date: Jan 2005
Location: Peachtree City, Ga
Posts: 1,040
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Electric Trim
In formation and Instruments, an electric trim is very handy. Note that most military jets had the electric trim actuated on the stick, typically via a 'coolie hat switch.'
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Vern Darley
Awarded FAA "The Wright Brothers 'Master Pilot' Award"- for 50 years safe flying
RV-6A N680V / RV-10QB N353RV
Luscombe 8E N2423K 50+years
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Falcon RV Squadron Founder
KFFC Hanger D-30
Peachtree City, Ga
770 310-7169
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05-28-2012, 08:50 PM
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Join Date: Aug 2006
Posts: 703
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I went with manual because in the planes that I have flown with electric trim (more than 10) I always wound up needing to use the manual wheel in cruise flight. I found it to be more able to fine tune the trim. On an rv you do not have a manual wheel at the same time as an electric thing.
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RV 7
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05-28-2012, 10:09 PM
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Join Date: Jan 2005
Location: Boise, ID
Posts: 1,007
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The manual pitch trim cable is a loopy thing that just takes up more foot room. How you'd snake it past a typical FI pump in the same area I don't know since I've always had carbs. The mounting tab is one more edge to dent your lower leg. It does work well, though.
Consider splitting the difference and use electric pitch and manual roll trims. Mount the switch/annunciator on the panel close to the throttle and perhaps the flap switch. You can still keep a hand on the throttle and work trim/flaps with your thumb - just like texting! - and you save the cost and complication of relays and wiring to the stick. It's also accessible for the FO.
John Siebold
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05-28-2012, 11:19 PM
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Join Date: Jan 2008
Location: KTCY
Posts: 643
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Quote:
Originally Posted by RV7ator
Mount the switch/annunciator on the panel close to the throttle and perhaps the flap switch.
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Or on the stick....
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Dave & Trina
RV-9A Flying  - 330 Hrs. Painted  Finishing the interior.
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