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Rudder trim input needed
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plevenda@jvlv.lv

Joined: 12 Oct 2007
Posts: 6
Location: Mesa, AZ

Posted: Mon Oct 15, 2007 3:46 pm Post subject: Re: Rudder trim input needed

A lot of great information. I am not real educated on the whole spring bias systems even though I have seen drawings. I have not thought about the balance issues with a system in the rudder itself either, but one thing I'm gathering is that it is something many people are wanting to see a solution to. Thanks again for the good dialog.



As far as my builder number and my status as new builder. My original number was 40733, but I then purchased Ed Wischmeyer's kit, thus taking on his number per Van's.

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_________________
Paul Levenda
#40090
N974LV

MauleDriver(at)nc.rr.com
Guest

Posted: Thu Oct 18, 2007 9:57 am Post subject: Rudder trim input needed

Yes, a spring bias system.  I've been thinking along the same lines for 

several reasons - but haven't even attempted to sketch anything out yet.



I like the idea of not have an extra control surface whether a vane, 

brake, or tab.  A mechanical setup suggest simplicity but that is not 

necessarily the case. 



My Maule uses a spring with a T handle on the panel to adjust it.  At 

some point I'm going to get under the covers and look at that.  It has 

worked well for me.



The Vans rudder control design seems to present challenges for a bias 

spring because of the lack of tension on the system.  I'll be installing 

that soon and will have a better sense of how that works.



Good dialog - Thanks.

Bill "went fly fishing off Montauk but anxious to get back to it" Watson

Durham #40605



William Curtis wrote:

 	  Quote: 	
		   



 And now for something completely different.



 My rudder trim will require absolutely NO modifications to the rudder.  The Van's aileron trim system uses a spring bias mechanism and I'm surprised no one has considered using a similar system for the rudder trim.  My Cardinal 177RG uses a mechanical spring bias system and I intend to develop a similar fully mechanical spring bias spring system for the RV-10.  



 In the Cardinal, the mechanical trim wheel is turned moving an actuator that applies (or removes) pressure to the rudder pedal assembly to effect rudder trim.  The same spring bias mechanism that is used for the aileron trim may be usable for the rudder trim. 



 William

 http://wcurtis.nerv10.com/

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recapen(at)earthlink.net
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Posted: Thu Oct 18, 2007 10:22 am Post subject: Rudder trim input needed

The RV6 manual aileron trim is a spring bias - I modified that design with the same servo as the elevator trim and put it in the hole where the aileron bellcrank hides.



I'm thinking of a similar system with a couple of cables going forward, pulleyed up to a joining point for the springs with a pushrod from the servo to set the spring bias.



My .02



Ralph Capen



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