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  #1  
Old 08-21-2011, 09:28 AM
JakeLewis22 JakeLewis22 is offline
 
Join Date: Oct 2007
Location: Mission Viejo, CA
Posts: 212
Default Measuring wing incidence on an RV-6

I'm helping a friend check the wing incidence on his flying RV-6. The plans for my 7 have you place one end of a level at the main spar and the other end on a 3" spacer at the rear spar.

My question for you RV-6 builders is, Is that spacer 3" on an RV-6 or is there a different measurement?
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RV7 - N223J
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  #2  
Old 08-21-2011, 09:55 AM
C-GRVT C-GRVT is offline
 
Join Date: Feb 2006
Posts: 305
Default 3.03 inch spacer

From the RV-6/6A manual:

level the fuselage,
then
"Rest one end of a level on the forward spar at the skin butt joint and the other end on a 3.03" spacer placed directly over the rear spar web....the spacer size has been calculated to provide the desired 1 degree positive incidence angle. Check several points along the span of the wing to verify the level reading."

Bill Brooks
Ottawa, Canada
RV-6a finishing
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  #3  
Old 08-21-2011, 11:07 AM
JakeLewis22 JakeLewis22 is offline
 
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Location: Mission Viejo, CA
Posts: 212
Default Thanks

Thanks Bill, I'll make a .030" shim for my fixture.
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RV7 - N223J
"First Flight September 1, 2012"
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  #4  
Old 08-22-2011, 06:56 AM
yakdriver yakdriver is offline
 
Join Date: Aug 2006
Location: Twin Falls, ID
Posts: 683
Default

If you want an accurate measurement find a machinist level. I found digital levels are not perfectly accurate when you get down to 1 degree or so. Don
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RV 7 N212MD Flying as of 12/22/2007
Backcountry/TCOW Super Cub flying 03/12/2011
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  #5  
Old 08-22-2011, 07:28 AM
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Mel Mel is online now
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
Default Remember....

The accuracy of the incidence measurement is not as critical as getting both wings the same.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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  #6  
Old 08-22-2011, 09:40 AM
yakdriver yakdriver is offline
 
Join Date: Aug 2006
Location: Twin Falls, ID
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Default

When I did my 7 wings I found if I set them 00 with a digital level (tried four levels by the way) then checked with the machinist level they were off up to 3/16". Don
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Backcountry/TCOW Super Cub flying 03/12/2011
Next project?
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