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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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 Posted: Sat Oct 27, 2007 10:38 pm Post subject: Great results after installing new Trim Controller |
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For those of you who've had the opportunity to see the RV-10's elevator
trim sensitivy in action (especially those who've taken a demo flight
with me because I like to show them first hand), I have a great write-up
for you.
After talking with Bob about his "Safety-Trim" system, I was intrigued
because I was just about to finally tackle the touchy elevator trim
problem and his system did an even better job at addressing some issues
than what my plans were. So, I jumped on his trim controller in
hopes that it would be the holy grail of trim controllers.
Today I finished installing the 2-speed 2-axis trim controller, and
got it out for some flight testing. I think it's going to be a winner,
and I think it's something that quite a few of you would highly
appreciate.
Sorry that it's a long write, up, but it covers a lot of ground,
including my chosen method for getting dual-speed integrated into
the RV-10.
Here's the write-up:
http://www.myrv10.com/N104CD/upgrades/20071027/index.html
The devil's in the details of this one. Messing with trim is
something you want to do right.
--
Tim Olson - RV-10 N104CD - Flying
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acs(at)acspropeller.com.a
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| Posted: Sun Oct 28, 2007 1:25 am Post subject: Great results after installing new Trim Controller |
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Great write up Tim.
This is what I've been looking for. I've been more than a tad concerned
about the possible severe forces that could be imposed with accidental
application of too much trim at high speeds and more so, runaway trim
possibilities on the current system and the problem with a reset.
I'll admit I'm more at home with a manual trim system on any aircraft I've
flown but that is usually because it isn't as easy to aquire an instant
"feel" for an electronic system versus a roll with the wheel, at least that
has been my experience.
I'm not sure if this is the same person and company that was mentioned a few
months back by someone when the discussion came up on the list about runaway
trims and resets?
I agree and believe if it works as advertised then this might be a good
safety edition.
Once again great writeup and thankyou for your research!
John 40315
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Sun Oct 28, 2007 5:02 am Post subject: Great results after installing new Trim Controller |
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You know, I thought of something I left out kind of, and that is
that it's a very easy retrofit installation. There is enough
wire in the harnesses that if you have all the relays mounted
in the same general area, you should be able to easily take a
flying RV-10 and cut this system in without much hassle. Other than
the waste you go through buying relays as an original installation, and
then throwing them away later, there's no reason why a person can't
just fly it the "bad" way and do some testing, and easily upgrade
once they see how bad it really is. It's a pretty drastic difference.
I know how it is to sit watching the list and wonder...."is it really
worth it?" or "do I really need that?", so perhaps what a person
needs is to first do their testing, and picture what they'd do in
some situations where the trim got wild. I think once a person
discovers the "problem", they'll want to take a preventative solution.
It's the reason that ever since I started giving demo flights,
I give a couple of standard statements:
"Go ahead and fly the plane as you would your own. Don't be afraid
to do steep turns or whatever you are comfortable with. But, be aware
that while the roll forces get very stiff at higher speeds, the pitch
forces are very light, so be easy on the elevator. And, the trim
works very quickly...here, let me show you....now that we're flying
level, hold the trim switch back for a count of 1 second..." That's
usually the point where their eyes bug out when they see how much
trim you can get at full-speed in 1 second. I've made it a point
to show people going all the way back, so obviously I believe that
it's an issue. I just didn't have the luck of finding the right
off-the-shelf system to fix it until now.
Hmm. I think I'll make these lines part of the page before too
many people read it.
Tim Olson - RV-10 N104CD - Flying
do not archive
John Dunne wrote:
[quote]
Great write up Tim.
This is what I've been looking for. I've been more than a tad concerned
about the possible severe forces that could be imposed with accidental
application of too much trim at high speeds and more so, runaway trim
possibilities on the current system and the problem with a reset.
I'll admit I'm more at home with a manual trim system on any aircraft
I've flown but that is usually because it isn't as easy to aquire an
instant "feel" for an electronic system versus a roll with the wheel, at
least that has been my experience.
I'm not sure if this is the same person and company that was mentioned a
few months back by someone when the discussion came up on the list about
runaway trims and resets?
I agree and believe if it works as advertised then this might be a good
safety edition.
Once again great writeup and thankyou for your research!
John 40315
---
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http://www.matronics.com/Navigator?RV10-List |
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msausen
Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA
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| Posted: Sun Oct 28, 2007 6:05 am Post subject: Great results after installing new Trim Controller |
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Looks pretty neat. How much did it cost you for the whole project?
Michael
--
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Sun Oct 28, 2007 6:34 am Post subject: Great results after installing new Trim Controller |
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It was just the price of the controller plus about $12 for my changing
up to the lever-lock switch plus the limit switch, (plus shipping on
those items), and then a few hours of time. The worst was running
the wire to the area in the back seat...I never pulled any extras
down there, so I had to remove the side panel under the door and
the side panel by the copilot knees. That was a pain. As far
as controllers go, they have single axis systems that would also
be fine for the install and could save money, but considering the
easier wiring, the dual-axis one adds that extra value. Pricing is
on Bob's site for all of the different systems. The one I got
was the 2 speed 2 axis at $445.
Tim Olson - RV-10 N104CD - Flying
do not archive
RV Builder (Michael Sausen) wrote:
[quote]
Looks pretty neat. How much did it cost you for the whole project?
Michael
--
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