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08-24-2013, 03:33 PM
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Join Date: Feb 2011
Location: Brandon, FL
Posts: 68
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Tail Offset
My buddy and I have been looking at an RV-8 that is for sale but is currently stored with it's wings and tail removed. I noticed that where it appears the (lower rudder bracket?) bolts to the rear of the fuselage the holes are offset slightly to the left (looking from the rear). I know it is fairly common to offset the vertical stabilizer to offset the p-factor but I couldn't make sense of why it appears that the rudder and/or vertical stabilizer are offset to the LEFT. Would this be something that the builder would drill per the plans? It seems that if it produces a vert. stab. that is angled to the right that would create a tendency to turn left.
We are satisfied with the build quality but this has us puzzled.
Any input would be greatly appreciated.
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08-24-2013, 04:02 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Leading edge of the vertical stabilizer is offset to the left, producing a right turn tendency, thereby counteracting "P"-factor.
__________________
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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08-24-2013, 04:13 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!
Dave, welcome aboard the good ship VAF 
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-24-2013, 06:20 PM
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Join Date: Feb 2011
Location: Brandon, FL
Posts: 68
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Mel,
Thanks for the response. That was what I was thinking too but it appears that the REAR of the vertical stabilizer and/or rudder is offset to the left on this -8. Does Van's specify in the plans that the front and/or rear attach points have offsets? I'm assuming that it would be similar on all models.
Would that be a factory made piece that was possibly installed backwards?
I should have taken a picture 
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08-24-2013, 07:21 PM
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Join Date: Sep 2005
Location: 1T7, Kestrel Airpark , Texas
Posts: 773
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no offset
Unless something has changed there should be no offset on the tail. The engine mount is offset on the -8.
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Wade Lively
-8, Flying!
N100WL
IO-360A3B6D, WW 200RV
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08-24-2013, 07:29 PM
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Join Date: Jul 2007
Location: Pembrokeshire, UK
Posts: 224
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Hi Dave. I am at work so don't have access to the plans but as far as I recall all the measurements for the tailplane are equal ie no offset.
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Bob Ellis
www.rv-8.co.uk
G-JBTR Having a ball flying this wonderful machine
Donation July 2016
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08-25-2013, 05:24 AM
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Join Date: Jan 2005
Location: Hicks Airfield, Fort Worth,Texas
Posts: 1,728
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no offset
The RV8 does not call out any offset in the VS
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Jay Pratt VAF #2
RV Central - Builder Assistance
Paul Revere, Borrowed Horse, & Shooter
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08-25-2013, 06:43 AM
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Join Date: Feb 2011
Location: Brandon, FL
Posts: 68
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Thanks guys!
It sounds like it is unanimous that the mount holes at the rear should all be centered....and these aren't. Since this plane is disassembled we were going to have to violate our "fly it before you buy it" rule which was made to avoid these issues.
Thanks again for your input.
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08-25-2013, 07:41 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by SuperDave
Thanks guys!
It sounds like it is unanimous that the mount holes at the rear should all be centered....and these aren't. Since this plane is disassembled we were going to have to violate our "fly it before you buy it" rule which was made to avoid these issues.
Thanks again for your input.
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Nobody says you can't offset the tail, although it appears this one is opposite of the normal function. The RV6's (at least the short tails) are not offset either, but most require a trim tab or wedge instead. If they don't, then something else could be crooked... 
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08-25-2013, 08:25 AM
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Join Date: Nov 2010
Location: lake charles, La.
Posts: 699
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Well maybe the builder was planning on using a motor that turns the "other" way.
Bird
__________________
Bird
rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
"to fly is a privilege that I am so thankful to God for"
http://www.mykitlog.com/tcb328/
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