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03-15-2005, 02:18 PM
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Join Date: Jan 2005
Location: Calimesa, California
Posts: 33
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Rear Spar Trimming Required? RV7 QB Wings
Just curious.. I haven't seen any posts on this. The rear spar was not trimmed for the wing box on my 7 per DWG 38. Is it an oversight, or is this because the same wings are utilized for the 7 and 8? The 8 doesn't require trimming , so I figure they simply leave that task to the 7 builder. Whats been your experience with QB wings for the 7?
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03-15-2005, 02:30 PM
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Join Date: Jan 2005
Location: Moved from Ketchikan, AK to Pocatello, ID
Posts: 28
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Drawing 38 detail
I had the same question for Van's.
The answer I got from them was kinda strange. The gist was that the detail in drawing 38 is full scale. So measure the drawing and then the rear spar and you will know if it has been trimmed already. My quickbuild wing had not been trimmed. I just was not expecting the drawing to be full scale. Many of Van's drawings are now that I'm clued to notice that detail.
__________________
Steve Ryon
Pocatello, ID / RV-7A
(wings, fuse, emp, finish kit in the garage...back to riveting)
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03-15-2005, 03:59 PM
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Moderator/Tech Counselor
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Join Date: Jan 2005
Location: East Troy, WI
Posts: 1,983
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The wings are used for both 7 and 8s. That piece does need to be trimmed. I actually needed to trim a little more off during wing fitup.
If you have access to a scanner or copier, make copies of the trim drawing and use as a template. Glue it on the spar and grind away.
Roberta
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03-15-2005, 06:30 PM
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Join Date: Jan 2005
Location: Calimesa, California
Posts: 33
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Thanks
Thanks to both of you for the sanity check.... There are no specific instructions for QB builders about this. It's a reminder to study the plans!!!!
Ted 
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03-15-2005, 06:31 PM
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Join Date: Feb 2005
Location: Abilene, TX
Posts: 725
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Like Roberta, I too had to trim a tiny extra off of the rear spar end. There was an interference with a universal rivet head on the fuse. It caused a small amount of forward sweep of the wings that I was not appy with. (It seems to me that the rivet should have been a 426 instead.) My wings & fuse are QB's
Sam
Last edited by TX7A : 03-15-2005 at 06:36 PM.
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03-15-2005, 07:12 PM
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Join Date: Jan 2005
Location: KPYM
Posts: 2,686
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I too, saw that and was puzzled!
So the general concensus is to trim them at fitup?
I was initially going to trim them during assembly, but realized that it could be done more accurately later.
Does everyone concur?
 CJ
__________________
RV-7 Flying - 1,200 Hours in 5 Years!
The experiment works!
TMX-IO-360, G3i ignition & G3X with VP-X
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03-15-2005, 07:29 PM
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Join Date: Feb 2005
Location: Abilene, TX
Posts: 725
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Capt. John,
I think I would go ahead and trim the rear spar per the drawing first. If you try to do it all during the fitup you may be taking the main spar bolts in & out quiet a lot trying to get it "just right". I would try to minimize the number of times the bolts get reinserted into the spar holes.
....Let me edit this now that I've looked at your question again...
If you're doing the standard build wings, it may be easier to trim the spar before assembly...(and I'm just going by Checkoway's comments) It is really no problem to trim at time of fitup.
Sam
Last edited by TX7A : 03-15-2005 at 07:42 PM.
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12-22-2005, 05:04 PM
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Join Date: Feb 2005
Location: Bakersfield ,Calyfornia
Posts: 922
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ah man, why didn't I do a search first.(or almost as good read the plans and prints.) it's all coming back now.
got a royal butt kickin' trying to just get drift 7/16 bolts thru the spar and now i have 1/8 of forward sweep. now to try to get those bolts out. Let me guess; i'm supposed to loosen up on those spar bolts first?
also, wish I remembered what the back on the trim area tab looks like, it looks like I could get it in another 1/8" since I can visually see the taper.
a 2x4 and a hammer didn't seem to make any difference.
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12-22-2005, 08:34 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 807
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After checking sweep we realized the rivet at the top of the spar tab was causing interference to obtain the proper "0" sweep
at the leading edge of the wing. We were able to pull each wing out a bit so I could Dremel the top of the rear spar away in
order to clear the rivet head. After the wings are removed later I will clean this area up a bit. I also had to Dremel a bit away
just under the rivet to clear the skin. This is why I said up front it would have been great to cut the tab about 1/16" shorter
than the plans call for here.
Heres my install experience. http://www.jeffsrv-7a.com/WINGS/05-11-20.htm
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12-23-2005, 09:57 AM
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Join Date: Feb 2005
Location: Bakersfield ,Calyfornia
Posts: 922
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thanks jeff
great picts jeff, just what i needed yesterday. Urggh.
interesting with that brasher head rivet, you're right plenty of room to get edge clearance without staying so close to it.
thanks again.
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