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  #1  
Old 10-07-2017, 09:40 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 478
Default Trim forces with aileron trim

I'm putting the trim aileron system together, and it is all fitting together fine, except that the little slot to hold the wire connector makes no sense and I'm not using that cutout.

My question is about the spring tension and how the forces work for trim. The way it is setup any aileron action at the stick must pull on the trim actuator arm via the springs connected to it. The springs are pretty strong - 6" of spread when connected and seems like 30-40 pounds of force to get it done. The springs counter each other so tensioning one relaxes the other, so I suppose at the stick you can't feel the difference when moving it around?

The linkages to the spring arm move freely but there is a little play at the elbow so that the arm has about 1/32 play. Will that make any practical difference? Or should I redo the linkage between the servo and spring arm to get that play out?
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Last edited by JDA_BTR : 10-07-2017 at 09:43 AM.
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  #2  
Old 10-07-2017, 10:01 AM
Ron B. Ron B. is offline
 
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Location: Yarmouth, Nova Scotia
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I'm having trouble following your question. Your are referring to the actuator arm , do you mean on the servo? You can feel the spring tension static but I do not notice them in flight.
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  #3  
Old 10-07-2017, 10:26 AM
JDA_BTR JDA_BTR is offline
 
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Location: Baton Rouge, LA
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There is the arm that comes out of the servo. then a linkage to the rotating arm that connects to the spring. The rotating arm has a little lateral play, not much. The linkage at the servo arm is tight. The linkage to the rotating arm has more play. Overall it is 1/32 at the end of the linkage arm back and forth; just a little wiggle.
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  #4  
Old 10-08-2017, 09:05 AM
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Jared_Solomon Jared_Solomon is offline
 
Join Date: Sep 2006
Location: Powder Springs, GA
Posts: 58
Default I think your good to go

I have the aileron trim installed. I donít think the little bit of wiggle is going to effect much. The whole linkage assembly is put together with pins. Iím pretty sure my arm has a little bit of wiggle without the spring tension on it as well. The spring tension takes up the wiggle. In the end, due to the wiggle theoretically you end up with about 1/32nd of deadband when switching directions. The aileron trim isnít sensitive enough to notice it. You could confirm with Vans, but I would build on.
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RV-14A (N214WJ) - Flying since Sept 2017
RV-7A (N211WJ) Flying since 2009 (SOLD)
RV-7A (N132RD) bought flying 2014 (SOLD)

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  #5  
Old 10-13-2017, 03:04 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 478
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Iíve installed the module in the wing. When the aileron is deflected Iím seeing a fair amount of flex in the access plate - those springs are really strong and it was some work to get them both on. When I move the aileron through the neutral position there is a slight rattle sound as the linkage jiggles passing thru the neutral position. Iím tempted to take it off and remake the linkages for zero play but not sure if that is really needed. Iím also looking at it with the wings on edge in a stand and balanced on the plane it will be a lot different.
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  #6  
Old 10-13-2017, 03:34 PM
Tom Martin Tom Martin is online now
 
Join Date: Jan 2005
Location: Ontario, Canada
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I flew the first 25 hours off with out the springs in the system. I wanted to feel what the roll forces were without the springs. The plane is quite a bit more stable then all the other RVs, with the exception of the RV10. I just installed the springs but have not yet flown the plane to see if there is a difference in feel.
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