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12-03-2009, 11:57 AM
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Join Date: May 2009
Location: Leeds, Maine
Posts: 55
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Electric vs Manual trim
I am ready to order my Emp kit and want to get some opinions on Electric vs Manual trim.
What are your thoughts?
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12-03-2009, 12:11 PM
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Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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Manual - Easier to fine tune in flight
Manual - More reliable
Electric - Weighs less
Electric - Can be integrated with a fancy autopilot
It's just up to you. Most people seem to build electric systems now-a-days. I don't think anyone who is familiar with RV's would be reluctant to buy an airplane with manual trim though. So little to no resale impact.
__________________
Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
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12-03-2009, 12:25 PM
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Join Date: Jun 2005
Posts: 693
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I prefer the electric trim, and with variable speed trim functionality (like in Vertical Power) it is very easy to fine tune in cruise.
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.
VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
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12-03-2009, 12:33 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Click on the search button. Lots of info on this topic already out there.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-03-2009, 01:58 PM
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Join Date: May 2009
Location: Leeds, Maine
Posts: 55
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Just hoping for the newest possible information
Quote:
Originally Posted by N941WR
Click on the search button. Lots of info on this topic already out there.
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I did search around and read a ton of posts, just wanted to be as current as possible.
It is a decision that I need to make soon and I like to research as much as I can. |
12-03-2009, 02:06 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by acezhi
I did search around and read a ton of posts, just wanted to be as current as possible.
It is a decision that I need to make soon and I like to research as much as I can.
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Actually, you can change it later. Even after the plane is flying.
I suspect there was nothing new to read on this topic. The big thing is if you go electric, where would you like your switches? Lots of people put them on the stick grip but that requires the added complexity of solenoids.
Too many production planes that I have flown had inop electric trim. They all had manual backup systems, which the RV does not. Keep in mind, you can easily over power the RV's trim, even at full deflection. It is just a pain to do so.
What I'm sure you read was that both trim systems worked and worked well. It is all up to you to pick the one you want. Either way, you can't go wrong.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-03-2009, 03:48 PM
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Join Date: Oct 2005
Location: Highland Village, TX
Posts: 1,519
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Quote:
Originally Posted by N941WR
... The big thing is if you go electric, where would you like your switches? Lots of people put them on the stick grip but that requires the added complexity of solenoids.
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Bill, what makes you say that a solenoid is needed for a stick grip switch? I don't have a solenoid for my basic hat switch on my stick grip.
I did wire in a speed controller for the electric trim (Matronics) but I don't know if that is really even needed.
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Rick Aronow,
A&P
Flying 7A Slider;
RV-12 SOLD
Highland Village,TX
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12-03-2009, 03:55 PM
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Join Date: Jul 2008
Location: Camas, WA
Posts: 481
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Manual. That trim motor never breaks. ;-)
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12-03-2009, 04:06 PM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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solenoid are not needed.
If you only wire in one stick, no solenoid is needed.
If you wire in two controls then you need the solenoid.
Electrons are light weight and easy to install. 
Kent
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Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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12-03-2009, 05:55 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
Originally Posted by Rick_A
Bill, what makes you say that a solenoid is needed for a stick grip switch? I don't have a solenoid for my basic hat switch on my stick grip.
I did wire in a speed controller for the electric trim (Matronics) but I don't know if that is really even needed.
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Quote:
Originally Posted by kentb
If you only wire in one stick, no solenoid is needed.
If you wire in two controls then you need the solenoid.
Electrons are light weight and easy to install.
Kent |
What is actually required is a relay. I believe a solenoid is considered to be an electrical device that produces a mechanical action.
A relay is need for some of the commonly used stick grip switches because they are not rated for the current draw of the trim motor. If a speed control is used it negates the need for a separate relay.
If we are voting for a favorite... after flying many hours in many different RV's I prefer manual elevator and aileron trim. Very precise and I can very quickly get the exact amount of trim I want, exactly when i want it.
I think Bills point was that you don't have to choose right now...If you go with manual right now (makes the emp. kit cheaper) you can easily add the electric later when nearing teh end of your build if you change your mind.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Last edited by rvbuilder2002 : 12-03-2009 at 05:59 PM.
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