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09-10-2011, 07:28 AM
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Join Date: Jan 2011
Location: Buffalo, NY
Posts: 8
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RV-8 and RV-7 wing interchangeability
All-
I'm currently in the process of setting my budget for an RV-7 slow build. I've got the plans and the practice kit, and I'm excited as all **** to get going.
Anyway, I was speaking with one of my dad's good friends, and he informed me that back around the year 2000, he started an RV-8. Finished the empennage with electric trim, and received the wings which he hasn't started on yet.
My question is whether I can use either or both to cut down on my costs by using some or all of the pieces. I missed Van's tech support window last night, so if there's anybody out there who can give me a real answer (no guesses or "I heard that" answers, please), I'd be very appreciative.
Thanks in advance.
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09-10-2011, 09:44 AM
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Join Date: Dec 2005
Posts: 976
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I believe the spar attachements to/in the fuselage are different. Since Vans supply the spars pre-drilled / assembled, and would assume these form the bulk of the costs of the wing kit, I doubt there would be a huge benefit?
Skins/ribs/tips I am sure are the same, and in theory would save. That's before however you get into Van's pricing of individual parts v complete kits.
Andy & Ellie Hill
RV-8 G-HILZ
RV8tors
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09-10-2011, 09:54 AM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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Why not build an 8 instead? 
__________________
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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09-10-2011, 10:12 AM
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Join Date: Dec 2008
Location: Los Angeles, CA
Posts: 301
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I second that
I would build an 8, and get the friend to help. It will go much quicker and be more fun with more builders/ support. JMO
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09-10-2011, 02:44 PM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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On the slow build 7, the rear spar is a -8 spar until it is trimmed. the lower inboard 8 skin has a Naca vent that is not on the 7. I do not know about interchangeability of the ailerons and flaps.
__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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09-10-2011, 06:07 PM
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Join Date: Jan 2011
Location: Buffalo, NY
Posts: 8
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AltonD - So you think it'd be useable? What's the NACA duct on the -8 for?
Also, I do not want an -8. I want the side by side so that my wife will fly with me. I flew for a couple years with my dad in his Decathlon (tandem seating) and it really wasn't as fun as his Luscombe (side by side) because I couldn't see the instruments, couldn't see what he was doing with his feet, etc etc.
Anybody have any thoughts on the empennage?
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09-10-2011, 06:45 PM
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Join Date: Jul 2009
Location: Petaluma, CA
Posts: 233
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the NACA duct in the -8 wing is...
the NACA duct in the 8 wing bottom skin is for rear passenger ventilation.
It is not present in the 7 because there, well, is no rear passenger. One important difference between the 7 and 8 is the shape of the rear spar stub. If it's not been built or worked on-- it will work in either a 7 or 8.
I'd be most interested in the fact that the wing, when ordered, comes with the center section that has been match drilled at the factory. I've read that this doesn't matter and that wings for the most part are interchangeable because of the precision at the factory, but if the wings started life as a -7 and you are going to an -8 then you'll have to buy the spar carry through.
__________________
Bill Mason
RV7 SB in construction
Avionics, Wiring, FWF, interior, and paint to go.
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09-10-2011, 10:02 PM
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Join Date: Jun 2006
Location: tucson, az
Posts: 104
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Back to the spar attachment question?
I am building an RV-8. A friend gave me his wooden spar spacers that he used on his RV-7A. The spar bolt holes did not line up. I had to turn the blocks around and re-drill the holes. I think this is a show stopper. I would call Van?s, maybe there is a work around. I know they have been asked this question before.
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Bill Finnell
RV-8 Fuselage
Tucson AZ
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