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  #11  
Old 03-10-2018, 12:37 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
Posts: 178
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I initially used the yardstick method and that's what got me into trouble it seems. Maybe it was too flexible. I thought I had it right, but no.

I bought the full size template from Van's, cut it out with scissors, and traced it onto a piece of plywood. I cut it out with a jigsaw, going slow to try and be accurate. I spliced a couple of vertical strips of ply across it ahead of the leading edge and aft of the trailing edge with 4 bolts in each strip. Then I removed the strips and split the template at the leading and trailing edges. Once the strips were bolted back on, I had a template that I could place at any location spanwise on the wing. Yes, there was a bit of estimating involved, but it did show up pretty clearly where I had an alignment problem that wasn't obvious without the template. I moved the hinges to get the aileron where it needed to be and, with the ailerons clamped in trail, re-adjusted the push/pull tubes to get the stick vertical. I don't think I spent more than about a day's worth of work on the whole project and it made a big difference in how she flies.

Ed Holyoke



Quote:
Originally Posted by az_gila View Post
I could never get any of the templates cut accurately enough to get good alignment on my -6A.

Instead I used two flexible yardsticks laid chord-wise, one on each surface of the wing, and flexed them to meet at the trailing edge. Just envision the flexible rulers as the airflow and get an idea of the top and bottom surface 'smoothness' to this airflow.

As Scott says the aileron is a little 'fatter' than the aft end of the wing so these yard sticks can see if the 'bulge' is equal on the top and bottom surfaces. This method will also check for a top surface skin 'ski-jump'.
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  #12  
Old 03-10-2018, 12:41 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
Posts: 178
Default Template from Van's

Search Term: DOC AIRFOIL TEMPLATE
Parts Matching Your Search

WING TEMPLATE 4/6/7/8
DOC AIRFOIL TEMPLATE

$5.00

This is full scale.

Ed Holyoke

Quote:
Originally Posted by Bob Martin View Post
Ed,
Would you describe your process of building an airfoil plywood template?
Obviously the plans are not full scale.
Do you or I just use the actual finished wing as a male side and extend the top and bottom skin lines back to an intersection point?
Thanks
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  #13  
Old 06-02-2018, 06:15 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,558
Thumbs up Near final resolution - balanced flight

Quote:
Originally Posted by BillL View Post
I have a heavy wing as well and working through the document with some assistance from Eric at Vans. The final solution has not been reached, but in hearing about the aileron "height" made this to understand what it is supposed to be.

The aero guys could help here too. The B zone on mine droops a little due to the installation of that brace (aileron fairing). The A point seems like it should be exactly in line with the extended (straight) line of zones B and C. I am assuming aileron height is relative to that line? Suppose that A is in line but the zone B is drooped by a mm, what effect would that have?

I'm going to quote myself.

My heavy wing is resolved. I shimmed so the zone B was raised by .040". Then I had 3 low hinge points and one nearly even. After remeasuring the "height" it confirmed the three had to be raised. The left outboard was raised 1/16" initially, but lowered 1/32" for improvement. The right inboard 1/16", right outboard .050", final was increased to 1/16". It now seems to fly balanced. I squeezed the right (light) aileron so will raise the outer hinge another tiny bit to get a little heaviness on the right side. Then after transferring all the new hole locations to new hinges, I can squeeze the left aileron to balance if needed.

I was at the end of my rope making changes I did not understand, so contacted a couple of our most experienced VAF members, both quite knowledgeable. A series of email discussions and them sharing some measurements too, solidified the final plan. They gave me confidence in the fundamentals of the plan and I just carried it out. VAF members to the rescue . . . again. Very satisfying to have this resolved as it had to be dealt with each flight.

This experience leads me to say, check everything then move the hinges to effect real change. Squeeze last.
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Bill

RV-7
1st Flight 1-27-18
Phase II 8-3-18
Repairman 11-15-18
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  #14  
Old 06-02-2018, 07:31 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,878
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Quote:
Originally Posted by BillL View Post
I'm going to quote myself.

My heavy wing is resolved. I shimmed so the zone B was raised by .040". Then I had 3 low hinge points and one nearly even. After remeasuring the "height" it confirmed the three had to be raised. The left outboard was raised 1/16" initially, but lowered 1/32" for improvement. The right inboard 1/16", right outboard .050", final was increased to 1/16". It now seems to fly balanced. I squeezed the right (light) aileron so will raise the outer hinge another tiny bit to get a little heaviness on the right side. Then after transferring all the new hole locations to new hinges, I can squeeze the left aileron to balance if needed.

I was at the end of my rope making changes I did not understand, so contacted a couple of our most experienced VAF members, both quite knowledgeable. A series of email discussions and them sharing some measurements too, solidified the final plan. They gave me confidence in the fundamentals of the plan and I just carried it out. VAF members to the rescue . . . again. Very satisfying to have this resolved as it had to be dealt with each flight.

This experience leads me to say, check everything then move the hinges to effect real change. Squeeze last.
Did the experienced VAF members mention that by design the aileron is slightly thicker than the profile of the wing, so the top should be above the skin of the wing slightly (like you have depicted with your red line)?
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Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #15  
Old 06-02-2018, 08:10 PM
cardinalflier cardinalflier is online now
 
Join Date: Jul 2015
Location: Granite Bay, Ca
Posts: 92
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I just solved my heavy wing issue by raising the inboard end of the right aileron by about 1/16-3/32. The amount was so small i did not expect any change. But, I was pleasantly surprised that my manual aileron trim now is centered instead of being offset a lot to the left. Bruce Estes. RV6.
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  #16  
Old 06-02-2018, 08:53 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,558
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Quote:
Originally Posted by rvbuilder2002 View Post
Did the experienced VAF members mention that by design the aileron is slightly thicker than the profile of the wing, so the top should be above the skin of the wing slightly (like you have depicted with your red line)?
No, but you did in the post above, and all my measurements had both of them way too low. So their suggestion to raise them was very consistent with your information. Now that I understand this geometry a tiny bit better, your implied suggestion comes through, but honestly, it didn't at the time.

Email sent to you, Scott.
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Bill

RV-7
1st Flight 1-27-18
Phase II 8-3-18
Repairman 11-15-18

Last edited by BillL : 06-03-2018 at 07:21 AM.
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