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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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 Posted: Fri Mar 07, 2008 8:45 am Post subject: Rudder Trim with Spring Bias |
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The rudder trim system I have just installed seems to work very well. I used
the same parts van uses for the aileron trim. I had already installed and
wired in the LED trim indicator on my instrument panel and had a 5 wire
cable run into the tail cone when I built the plane. I neglected to put a
trim switch on the panel at the same time so I had to add that. (I can't
remember why I didn't already have the switch installed - it sure would have
made it simple then.) I made a pulley bracket that installs on top of F-1035
Battery/Bellcrank Mount and positions the pulley approximately between the
rudder cables. (Later the elevator trim servo motor mount will install on
top of this bracket and use the same screws.) I couldn't think of a neat way
to attach to the rudder cables so I ran additional cables from the rudder
trim servo back to the rudder horn and attached them there. Only had to
drill 4 holes in the bottom skin to mount the trim servo and, if you don't
count some missing skin and mild curses, installation was easy especially
since I had already run the wires and the indicator was in place and wired.
I picked up power and ground from the nearby flap switch. The pulley bracket
is .032 with the edges bent up and a .032 doubler under the pulley. The
springs span a 12" gap just like the aileron trim system does but I may add
a bit more tension. I sort of holds the rudder from swinging easily on the
ground but really doesn't function as a gust lock.
Albert Gardner
N991RV
Yuma,
AZ
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RV-9A N872RV
RV-10 N991RV |
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jkreidler
Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI
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| Posted: Sun Mar 09, 2008 10:38 am Post subject: Re: Rudder Trim with Spring Bias |
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Albert, I really like this approach. I especially like the ease of installation, this is something that could be added after the fact without much headache at all. I had never thought of mounting the mechanism in the tail cone, I was always trying to 'wedge' it in the tunnel somewhere. Nice work!
I do have some questions though. Are the springs initially stretched? In other words if the rudder placed at full deflection do both springs still have tension in them (one spring barely tensioned, and the other nearly fully extended)?
What trim force do you think you are getting? I had sent an e-mail to Vans asking what input they thought would be required. They told me that a 5 to 10 pound force as measured at the bottom of the rudder pedal should take care of any 'normal' trim, 25 pounds could be required to compensate for takeoff forces.
I have been crunching numbers on the torsion spring bias system that I had designed. I am having difficulty getting the required trim force without overloading the trim servo motor, or limiting the travel too much. A combination of the two systems may be just the ticket to realize the benefits of both.
Again I really like the different approach, thanks for sharing.
Jason Kreidler - #40617
4 Partner Build - Finishing
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