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  #1  
Old 05-17-2018, 04:45 PM
bkervaski's Avatar
bkervaski bkervaski is offline
 
Join Date: Mar 2017
Location: Birmingham, Alabama
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Default Flap Travel

Hi All,

I read on a -10 post that the reflex position (-3 degrees) is when the flap is lined up with the bottom of the fuselage, is that true for the 14?

I've tried following the book and using the 7 degree offset to get the starting point, could never get less than 8 degrees before the flaps would bottom out on the spar. Called Vans, they said "that's fine, that's your starting point."

What are you guys using for your flap positions between -3 and 30?

Are you getting 30 or more?

If so, how much did you adjust your push rod from the plans?

Any insight into others' setup procedure here would be very much appreciated!

And finally ... All of my flap hinges are rubbing on one side or the other towards the top (quick build wings), is paint rubbing off here a normal accepted thing with an RV? (no frame of reference so not sure)
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Last edited by bkervaski : 05-17-2018 at 04:53 PM.
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  #2  
Old 05-17-2018, 05:27 PM
DaveO DaveO is offline
 
Join Date: Dec 2012
Location: Greenfield, IN
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I would be interested in what others had to say.

I remember building my seven, I lined my flaps up with the neutral position of my ailerons. I do not think I used any other means.
But it is possible, I could be absent minded, so I will listen for the right answer.
Dave
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  #3  
Old 05-17-2018, 06:08 PM
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czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
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Bill,

I'm way behind your stage in the build and haven't mounted my wings to the fuselage yet, but on the wing stand I get approx 3 deg reflex when the flaps make contact with the rear spar. Dunno if that aligns exactly with the bottom of the fuselage, but I agree with Vans, that's your starting point...full up position. As long as the full down position is plus or minus a few deg from what Vans specs (30 I believe?) you'll be fine...full flap deflection angle isn't critical, but one thing I'd recommend checking is that both flaps are at the SAME angle especially in the full up position. If not, you're going to be out of rig. Same for the ailerons in the neutral position, they should measure the same angle with your digital level.

Regarding the flap hinges rubbing, have you checked to verify that the hinge bushing is exactly centered? You could also move the bushing slightly off-center if that helps with overall alignment. On my wings (in the wing stand) there's no contact anywhere. If you can't tweak things to avoid contact in all positions, you could use some clear 3M paint protection tape on the affected areas after painting. I also plan to put some tape on the top surface of the flap where it contacts the upper skin, and on the leading edge where it makes contact with the rear spar in the fully retracted (3 deg reflex) position.
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RV-8A N2D #80583 - built/flew/sold
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Last edited by czechsix : 05-17-2018 at 06:13 PM. Reason: typos/wording
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  #4  
Old 05-17-2018, 09:45 PM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Which section of the plan covers the flap final installation? I have gone thru the Wing section and did not see any specifics for the flap beside the construction of it.
I bought the thumb drive but have found that I am missing many of the parts.
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  #5  
Old 05-18-2018, 07:19 AM
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bkervaski bkervaski is offline
 
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Quote:
Regarding the flap hinges rubbing, have you checked to verify that the hinge bushing is exactly centered?
Yep, even offset them a bit to relieve the clearance a bit, but still not getting enough gap to where paint will stay on over time, rubbing.

I also shimmed the bolt to see if that would help but it didn't affect the top part were the rubbing is.

It looks like the flaps internal ribs' flange radius is the culprit, causing the hinge to be ever so slightly narrower towards the top. Quick build flaps.
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  #6  
Old 05-18-2018, 07:45 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by bkervaski View Post
Hi All,

I read on a -10 post that the reflex position (-3 degrees) is when the flap is lined up with the bottom of the fuselage, is that true for the 14?

I've tried following the book and using the 7 degree offset to get the starting point, could never get less than 8 degrees before the flaps would bottom out on the spar. Called Vans, they said "that's fine, that's your starting point."

What are you guys using for your flap positions between -3 and 30?

Are you getting 30 or more?

If so, how much did you adjust your push rod from the plans?

Any insight into others' setup procedure here would be very much appreciated!

And finally ... All of my flap hinges are rubbing on one side or the other towards the top (quick build wings), is paint rubbing off here a normal accepted thing with an RV? (no frame of reference so not sure)
I have a RV-10, so I can't specifically answer your question. But I would think if you set a level on the wing and aligned the flap with the level, that would be 0. Using a digital level it would be easy to make the other measurements.

Again, on my RV-10, I have -3, 0, 15, 30 or something close. I don't remember the exact travel of the top of my head. It's basically -3,0, half, and full flaps.

Rubbing is a bad thing! You need to resolve that issue by making a mechanical adjustment or filing the offending piece so it clears. Without see your specific issue, I would be hesitant to make a specific recommendation.
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  #7  
Old 05-18-2018, 07:56 AM
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bkervaski bkervaski is offline
 
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Quote:
Rubbing is a bad thing! You need to resolve that issue by making a mechanical adjustment or filing the offending piece so it clears.
Unfortunately, there is no adjustment to the top of the hinge, it's embedded inside the quick build flap between two ribs.

I'm going to try to adjust the bushings again this morning then call Vans, sounds like rubbing here isn't normal.
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  #8  
Old 05-18-2018, 08:06 AM
JDA_BTR JDA_BTR is offline
 
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My hinge does not rub at all. The skin does rub where the flap meets the top skin when the aileron is fully up. It's a feature now because my flaps are being stored on top of the wing in the wing stand and it keeps the flap from moving around. But I think I will have to do a bit of work with the seamer to life that skin up some off the flap before I mount it for real.
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  #9  
Old 05-18-2018, 11:33 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by JDA_BTR View Post
My hinge does not rub at all. The skin does rub where the flap meets the top skin when the aileron is fully up. It's a feature now because my flaps are being stored on top of the wing in the wing stand and it keeps the flap from moving around. But I think I will have to do a bit of work with the seamer to life that skin up some off the flap before I mount it for real.
We had a local builder fabricate a tool for just such a purpose. It came in handy on my RV-10. You could tweak the entire trailing edge at once.

He was an engineer that never found a problem he couldn't build a tool to fix. Unfortunately, he's moved out of state and I've lost contact with him.
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  #10  
Old 05-18-2018, 12:20 PM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by bkervaski View Post
Unfortunately, there is no adjustment to the top of the hinge, it's embedded inside the quick build flap between two ribs.

I'm going to try to adjust the bushings again this morning then call Vans, sounds like rubbing here isn't normal.
Bill,
Please let us know what VANS suggest about this. Mine rubs on one side (inboard side both side) so if I could shift the whole thing about .015, then probably wouldn't rob and it is only the last 3 or 4 degrees that starts rubbing.

I also checked the reflex degree which is about 4.2 degree if I set my reference point to the top of the wing and measure it when the flap hits the rear spar.

Hope this gives you more data point.
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