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10-25-2009, 07:36 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by apkp777
Anyhow, just some thoughts. It just would be nice to have trim without installing a tab. Those suck for sure.
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RV facts...........
RV's such as my 6A have a vertical stab with no offset. The 9 has an offset built in. I have a tab, and could care less. The 9 may not need one.
However, there is already a tensioning system for rudders on the market. It uses a small wheel and springs. Some pilots like it, some don't. There are a few other cable locking methods too. You can probably find these with a search. Personally I'm not a fan of bias springs for aileron or rudder. I have electric aileron trim that's hinged in the aileron and prefer it. Although my 6's rudder tab keeps the ball centered most of the time for cruise, I'd still prefer a hinged electric tab built into the rudder. A lot of the new RV10's have them.
L.Adamson --- RV6A
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10-25-2009, 07:40 AM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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Larry- You might be on to something. I will give that a thought.
I had a Cherokee and I loved the rudder trim. I'll bet with the kind of innovation in the minds of us RV folk, we can come up with something.
__________________
Tony Phillips
N524AP, RV 9 (tail wheel)
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10-25-2009, 07:43 AM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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LAdamson - I will look into the electric option.
What about just a cable lock that you install under the armrest. With like a 20 or so pound break away tension?
__________________
Tony Phillips
N524AP, RV 9 (tail wheel)
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10-25-2009, 07:49 AM
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Join Date: Jun 2006
Posts: 36
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rudder trim
Is this what you are looking for? http://www.mlblueskunk.com/Rudder_Trim_System.html
I'm doing a very slow build RV7 and wanted to avoid the rudder wedges often found on really well built RV's. I haven't flown with this but have installed it on my plane and was impressed with the quality and I think it stands a good chance of working as advertised.
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10-25-2009, 07:58 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by Loren
Is this what you are looking for? http://www.mlblueskunk.com/Rudder_Trim_System.html
I'm doing a very slow build RV7 and wanted to avoid the rudder wedges often found on really well built RV's. I haven't flown with this but have installed it on my plane and was impressed with the quality and I think it stands a good chance of working as advertised.
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That's the one I'm thinking of.
Perhaps I'm weird. I view airplanes as a bunch of movable surfaces and rivets. An added tab, wedge, or servo rod poking out just doesn't seem to bother me. But then I always enjoy looking at the mechanical complexity of an airliners wing, as the thumb screws seperate the flaps with all the hidden motors, hydraulics, wiring, etc..... to now be seen on landing.
L.Adamson ---- RV6A
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10-25-2009, 08:00 AM
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Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
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I have the Van's spring trim for my ailerons and it works well. However with fuel and pilot balanced I don't need it and can fly feet and hands off at cruise in calm air.
I do have to use it when I add flaps for landing. I assumed that I had the flaps rigged unevenly but I can't measure any difference with a digital level. Perhaps there is something more fundamental with asymmetric prop wash acting differently on each flap when extended. Or perhaps I just need to tweak them a little - but I don't want to affect the current flaps retracted trim. Also I don't have the gear fairings or wheel pants fitted yet so I'm not ready for final rigging yet.
I'm a big believer in simple and light.
Jim Sharkey
RV6 - Phase 1
Last edited by jsharkey : 10-25-2009 at 08:07 AM.
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10-25-2009, 08:40 AM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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The Skunkworks trim looks really good. I think i'll have a go with it.
__________________
Tony Phillips
N524AP, RV 9 (tail wheel)
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10-25-2009, 11:01 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by jsharkey
I have the Van's spring trim for my ailerons and it works well. However with fuel and pilot balanced I don't need it and can fly feet and hands off at cruise in calm air.
I do have to use it when I add flaps for landing. I assumed that I had the flaps rigged unevenly but I can't measure any difference with a digital level. Perhaps there is something more fundamental with asymmetric prop wash acting differently on each flap when extended. Or perhaps I just need to tweak them a little - but I don't want to affect the current flaps retracted trim. Also I don't have the gear fairings or wheel pants fitted yet so I'm not ready for final rigging yet.
I'm a big believer in simple and light.
RV6 - Phase 1
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I do re-trim ailerons when ever I feel like it's slightly out. My 6A has no roll changes when applying flaps.
I use to believe that simple and light was they way to go, even if I didn't adhere to it. But it turns out that my 6A is really fast, light on the controls with a good feel..........................and isn't a light weight by any means. So bring on the constant speed prop and other goodies!
Heck.............I can only go a few miles before the airspeed is in the yellow zone as it is!
L.Adamson --- RV6A
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10-25-2009, 12:57 PM
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Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
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The best laid schemes o' Mice an' Men,
Quote:
Originally Posted by L.Adamson
I use to believe that simple and light was they way to go, even if I didn't adhere to it. But it turns out that my 6A is really fast, light on the controls with a good feel..........................and isn't a light weight by any means. So bring on the constant speed prop and other goodies! 
L.Adamson --- RV6A
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....Gang aft agley,
From To a Mouse
by Robert Burns
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10-25-2009, 05:58 PM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,251
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Like this?
The opposite side has a fixed spring. The spring tails are attached with 1/8 cable clamps (not the cushion clamps shown).
Vern
Flight testing is pending before I make the kit available. It is designed to augment a fixed tab, not replace it. This will allow trim adjustments based on speed or attitude.
__________________
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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