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  #21  
Old 05-19-2011, 09:35 PM
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L.Adamson L.Adamson is offline
 
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Quote:
Originally Posted by N427EF View Post
The installation is also less invasive than hacking up the rudder and making accomodations for a servo.
It's no more of a hack, than the servo & hinge tab in my right aileron. It's even Van's approved..

Works very well too. And other pilots prefer it over their bias spring setup.

L.Adamson --- RV6A
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  #22  
Old 05-19-2011, 09:45 PM
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Bill.Peyton Bill.Peyton is offline
 
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I agree with you Wayne. I did speak with Vans regarding the trim tab mod and how it might affect the rudder balance. I decided not to make the mod. to the rudder, but have not ruled it out. I would rather have a solution that would help the stabilize the rudder from wind damage, keep the cables tensioned and also provide rudder trim. I did a temp. hook up of the springs from the rudders to the firewall. I really did not like the feel on the pedals. The springs cause the cables to really drag through the snap bushings, it's like pushing down on the left rudder while using the right rudder. I realize the the RA servo will not pull the spring, my plan was for a third spring just for the trim. It really only has to move less than an inch. I have been experimenting with some pulleys and rollers in two areas in the -10 that have several pounds of pressure on the snap bushings (with springs installed). The 10 is unlike the rest of the fleet, it's made to cruise not for aerobatics and boring holes in the sky. I am willing to accept a little less feel for a lot of convenience, I just haven't come up with the total solution at this point, but no rush here.
Bill
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  #23  
Old 05-20-2011, 09:31 PM
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midwest rv-10 midwest rv-10 is offline
 
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Default How about a manual trim system with a mixture cable,pulley and a spring??

Bill, Go to Tim Olson's site under modifications and look at my test version of a trim system. It uses a venier mixture cable to set rudder trim. I have a spring that allows for rudder pedal travel at all times.really easy to do. I refined the system with a traditional mixture cable after completing a proof of concept with the system pictured on Tim's site. 400 hrs and works fine, also works as a gust lock by pulling up the cable to pull the right rudder pedal down then install a converted extendable painting pole to push down on the left rudder pedal. It works great. Just another way to approach it.

Take a look see,
Don Orrick
N410JA
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  #24  
Old 05-20-2011, 09:38 PM
Wayne Gillispie Wayne Gillispie is offline
 
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Default Take your time...

research, test if possible, weigh the advantages vs disadvantages then build it or go back to the plans and keep truckin'. I heard from many guys before I started that if you want to finish quick stick to the plans so that is what I have been doing for 99% of the plane. Nothing wrong with making improvements as long as we know how it may effect something else later like "flutter". No boring holes in the dirt either. Aerobatics look like fun but my stomach as well as the wife/kids could not stand it. Hoping for some more sunny days. We had a mostly sunny day today. More rain starting tomorrow. Not condusive to flying is it.
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  #25  
Old 05-20-2011, 10:00 PM
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Bill.Peyton Bill.Peyton is offline
 
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Don, I can't find the link in Tim's site. Do you have a link?

Wayne, The mods take too much time don't they! I have been using the crappie weather for shooting approaches. We had some good 700 foot ceilings in light rain the other day. It keeps you current and comfortble when you have the real thing. I ahve been spending too much time building and not enough time flying!
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  #26  
Old 05-20-2011, 11:15 PM
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Been there, done that, doesn't work.

What is needed is a system that relaxes the tension on one spring while the other is extended, like the manual aileron trim system that Van's provides.

It takes some head scratching to see why a fixed bias spring coupled with a variable bias spring system does not work. The clue is that when one spring is pulled on by the servo, the opposing spring is extended so that both springs end up being the same length, thus providing equal and opposite force. The rudder neutral position will change on the ground, but there is not enough differential force to have any affect during flight.

Trust me on this one. I flight tested a system with a fixed bias + variable bias and it had zero effect even with the fairly stiff springs that I used. I think very strong springs would work, but not with a RAC servo.

Vern

Quote:
Originally Posted by Bill.Peyton View Post
That's kind of the conclusion I have come to also. Some light springs with a TA-12a servo on one spring is all it should take
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  #27  
Old 05-21-2011, 01:42 PM
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I can't find the link in Tim's site. Do you have a link?

Bill,
Go to building tips, under that look for cool mods, in the cool mods look for rudder trim.
Don
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