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  #1  
Old 12-05-2017, 01:21 PM
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mfleming mfleming is offline
 
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Location: Joseph, Oregon
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Question Delrin Aileron Stop

While doing research on fabricating the Van's aileron stop I came across info on making the Delrin stop. Looked great, simple, easy and adjustable!

So I ordered several diameters of Delrin stock...Others had used " stock but my gap looked pretty big. Using " stock I fabricated a stop with the aluminum bushing pressed into it.

The " stop isn't event close to touching the bracket?? Is there really that big of difference in hinge dimensions between projects? It looks like I will need at least a 1" stop.

Am I doing something wrong??




The gap is really more than this photo shows, because the aileron is resting against one of the hinge bolts on the outboard end.
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  #2  
Old 12-05-2017, 02:59 PM
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jmjula jmjula is offline
 
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Default

I made mine using a hole saw in a sheet of delrin of the right width, then I "lathed" it to the perfect diameter using a cordless drill and the bench scotch-brite wheel. I don't remember exactly what diameter I ended up with, though visually looking at your pictures I believe mine are slightly bigger. That said, each side is a different diameter to get the deflections to match right and left, so I do know there is a variance.

EDIT: measured mine, they are both about 15/16" in diameter, and I have mid-range deflection to limit the sticks contact with the throttle and mixture
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Last edited by jmjula : 12-08-2017 at 04:31 PM.
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  #3  
Old 12-05-2017, 04:50 PM
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mfleming mfleming is offline
 
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Quote:
Originally Posted by jmjula View Post
I made mine using a hole saw in a sheet of delrin of the right width, then I "lathed" it to the perfect diameter using a cordless drill and the bench scotch-brite wheel. I don't remember exactly what diameter I ended up with, though visually looking at your pictures I believe mine are slightly bigger. That said, each side is a different diameter to get the deflections to match right and left, so I do know there is a variance.
Great tip...

I'm thinking I must have done something wrong because even a ⅞" delrin spacer would fall far short of stopping the aileron

With the aileron full up and no stop, I measure 32°...That doesn't seem right.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Empennage (sans fiberglass), ailerons and flaps complete.
Working on wing and fuel tanks.
Donated 2017

Last edited by mfleming : 12-05-2017 at 04:55 PM. Reason: Add content
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  #4  
Old 12-05-2017, 04:56 PM
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Bruce Bruce is offline
 
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Michael,

I used a -3 bolt and 2 big washers and then ground on wheel.
Can't remember the washer size but the 1" size sounds right.
You should have a stack of the washers in the kit.

You have to put on both sides.
Then you can get the right measurements.
Everything has to be hooked up.
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Last edited by Bruce : 12-05-2017 at 04:58 PM. Reason: Added more
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  #5  
Old 12-05-2017, 06:04 PM
BillL BillL is offline
 
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Default Just did this today

It seems I totally missed the stop and some friendly builders found the deficiency. I used some wax to measure and came up with .490" for left and .560" for the right. I would not venture to comment on what is right.

You might check Mike Bullocks website - rvplane.com to see what size he had.
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  #6  
Old 12-05-2017, 06:38 PM
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mfleming mfleming is offline
 
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Thumbs up

Quote:
Originally Posted by BillL View Post
It seems I totally missed the stop and some friendly builders found the deficiency. I used some wax to measure and came up with .490" for left and .560" for the right. I would not venture to comment on what is right.

You might check Mike Bullocks website - rvplane.com to see what size he had.
Very cool trick...

So the measurement of .490 for instance, was the distance needed to be bridged and the diameter of the stop would be roughly double that?
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Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Empennage (sans fiberglass), ailerons and flaps complete.
Working on wing and fuel tanks.
Donated 2017
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  #7  
Old 12-06-2017, 06:00 AM
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Default Take black Delrin

Take black Delrin, it is better regarding UV stability.

The black pigments are preventing the UV ray's to enter the material.
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  #8  
Old 12-06-2017, 11:37 AM
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bruceh bruceh is offline
 
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Default

I think I used 7/8" diameter on the RV-9A.

I've still got a bunch of material left, so if anyone needs some.....

Good instructions on Smitty's site.
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  #9  
Old 12-06-2017, 12:07 PM
PilotjohnS PilotjohnS is offline
 
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Default Deal

Bruce,
I will take some of that extra delrin.
Thanks
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  #10  
Old 12-07-2017, 06:32 PM
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RV7A Flyer RV7A Flyer is offline
 
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Quote:
Originally Posted by mfleming View Post
Great tip...

I'm thinking I must have done something wrong because even a ⅞" delrin spacer would fall far short of stopping the aileron

With the aileron full up and no stop, I measure 32...That doesn't seem right.
Isn't that what the manual gives for Max Up deflection?

Design Travel in degrees Maximum Up/Down Minimum Up/Down
Aileron 32/17 25/15
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