RV8-List Digest Archive

Mon 07/13/09


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 05:24 AM - Re: Wing Tip Installation - Droopy Right... (Kopp, Kenneth G CDR HSM-70, N0 Exec Staff)
     2. 07:08 AM - Re: Re: Wing Tip Installation - Droopy Right (Glenn Bell)
 
 
 


Message 1


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    Time: 05:24:41 AM PST US
    Subject: Wing Tip Installation - Droopy Right...
    From: "Kopp, Kenneth G CDR HSM-70, N0 Exec Staff" <kenneth.kopp@navy.mil>
    Matt - Same exact problem with mine as well. The left side was perfect without any fussing. The right side is about 3/8" low at the T/E corner. The two tips are certainly different (not just mirror images)...when I was making my lighting back plates I trimmed them to match the exact contour of the inside faces of the each tip. When I compare the left plates to the corresponding plates of the right tip they are significantly different shape and size...you cant notice this because you'll never be able to see both close together but it does make you wonder about the quality of the molds used to fabricate the tips. I have not yet decided if I'll try to fix this or not. Aerodynamically it will be insignificant. Aesthetically, I doubt you will ever notice since on the ground the T/E is so low you'll never be able to see the line from flap-to-aileron-tip. I thought about slitting the trailing edge but with all the holes drilled this isn't going to work. Something has to move. Another options would be to fab an aluminum backing plate for the lower holes...realign the tip and redrill the lower holes through the backing plate...the #6 dimples are too small to worry about.. IMHO Best of luck, Ken -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Jim Gray Sent: Friday, July 10, 2009 19:55 Subject: Re: RV8-List: Wing Tip Installation - Droopy Right... Matt, I ran into the same problem, and slitting the trailing edge worked like a champ. The difference may be that I slit the trailing edge before I had drilled the holes all the way around the tip that attach it to the wing. You might try putting clecos in just the top section of the wingtip, leave the bottom free, and see if that allows you to move the wing tip into alignment. I gather all of the holes have been drilled, so it may be too late, but it may give you an idea how to attack it. Good luck, Jim Gray N747JG RV-8 100 hours On Jul 10, 2009, at 3:26 PM, Matt Dralle wrote: > > Dear Listers, > > I installed the wing tips on the -8 last week and they came out > perfect. I was really pleased and relieved. They each took about 8 > hours including cutting the plastic lens. > > That's the good news. The bad news is that the right tip at the > trailing edge came out about 1/2" low. The left one is exactly the > correct height. I measured this by making the short aileron push > rod the exact length stated on the plans (27 5/8" I think it was) > and then using that W-730 jig to center the bellcrank and I assume > the aileron. > > Installation of the left wing tip, which I did first, went really > smoothly and I had little trouble fitting or aligning. The right > one, however, really fought me and in my zest to make sure that the > lap joint between the metal skin and the fiberglass was perfect, I > kind of neglected to triple check the height of the trailing edge of > the tip as it related to the aileron. I focused more on the > alignment of length of the two and that they were correct. > > Anyway, I was rigging the ailerons this week and connecting to the > control stick and that's when I noticed that the right tip was > drooping about 1/2" lower than the aileron. I tried removing the > tip RIB and fusing around a bit, but this didn't help, and then I > tried slitting the trailing edge of the tip. This allowed me to > align the tip to the aileron at the inboard side of the tip, but it > didn't allow me to raise the outboard edge of the tip (without a > whole bunch of extra fiberglass work). > > I'm not opposed to getting a new wing tip and just starting over > again, but I was wondering if anyone else had this same trouble, > i.e. left tip fit great, right tip didn't fit very well and was low > at the trailing edge. I'm wondering if its just a problem with the > fiberglass layup. > > Now that all of the holes in the skin for the wing tip mounting are > dimpled (I used #6 screws), fitting a new tip is going to be a real > tough job because I won't be able to get the tip flat against the > skin. Arg... > > Any feedback would be appreciated. > > Matt Dralle > RV-8 #82880 N998RV > Wing-to-Fuselage Fairings (oh, and redoing the right wing > tip)...<2009.07.02 - RV-8 - Right Wing Tip Installation A > (42).jpg><2009.06.28 - RV-8 - Left Wing Tip Installation > (39).jpg><2009.07.02 - RV-8 - Right Wing Tip Installation A > (40).jpg><2009.06.28 - RV-8 - Left Wing Tip Installation (42).jpg>


    Message 2


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    Time: 07:08:55 AM PST US
    From: "Glenn Bell" <glennbell@cablelynx.com>
    Subject: Re: Wing Tip Installation - Droopy Right
    For what its worth=85I used the alignment jigs exactly as called for in aligning the ailerons=85when I then lined up the flaps it seemed that they were a little low at the fuse intersection=85I temp installed the tips and noticed that the ailerons were a little low in relation to the tips=85I looked at the the transition of the ailerons and how they subjectively looked in the transition of the upper and lower surfaces of the wings..the lower surface should have looked almost flat but it wasn=92t..so=85I aligned the aileron to what I felt was the appropriate trail position without regard to the jig..when I did that the flap nestled up to the fuse perfectly and the tip matched the aileron like it should=85I put a couple bolts in the rib alignment holes and ran a string out to the rear edge of the aileron=85it was off by =BD inch or so=85so=85.i think , in my case , the alignment hole(s) were not in the proper place to be used as reference points=85 Had I proceded as instructed , both ailerons would hav been deflected, the tips wouldn=92t fit and the flap intersection would have looked pretty bad..also, our kit is qb and the tips are epoxy resin.. From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Speedy11@aol.com Sent: Saturday, July 11, 2009 11:13 AM Subject: RV8-List: Re: Wing Tip Installation - Droopy Right Matt, I have a similar problem except that mine are both off my about 1/2 inch. But my tip are the old style and about 8 years old. I decided to go ahead a fly it and see how it handles and then attack the problem once I've talked to others. It flies great! I'm not sure I'll change anything. Let us know on the forum if you find an answer. Stan Sutterfield 1.0 Hrs I installed the wing tips on the -8 last week and they came out perfect. I was really pleased and relieved. They each took about 8 hours including cutting the plastic lens. That's the good news. The bad news is that the right tip at the trailing edge came out about 1/2" low. The left one is exactly the correct height. I measured this by making the short aileron push rod the exact length stated on the plans (27 5/8" I think it was) and then using that W-730 jig to center the bellcrank and I assume the aileron. Installation of the left wing tip, which I did first, went really smoothly and I had little trouble fitting or aligning. The right one, however, really fought me and in my zest to make sure that the lap joint between the metal skin and the fiberglass was perfect, I kind of neglected to triple check the height of the trailing edge of the tip as it related to the aileron. I focused more on the alignment of length of the two and that they were correct. Anyway, I was rigging the ailerons this week and connecting to the control stick and that's when I noticed that the right tip was drooping about 1/2" lower than the aileron. I tried removing the tip RIB and fusing around a bit, but this didn't help, and then I tried slitting the trailing edge of the tip. This allowed me to align the tip to the aileron at the inboard side of the tip, but it didn't allow me to raise the outboard edge of the tip (without a whole bunch of extra fiberglass work). I'm not opposed to getting a new wing tip and just starting over again, but I was wondering if anyone else had this same trouble, i.e. left tip fit great, right tip didn't fit very well and was low at the trailing edge. I'm wondering if its just a problem with the fiberglass layup. Now that all of the holes in the skin for the wing tip mounting are dimpled (I used #6 screws), fitting a new tip is going to be a real tough job because I won't be able to get the tip flat against the skin. Arg... Any feedback would be appreciated. _____ Summer concert season is here! Find your favorite <http://www.tourtracker.com/?ncid=emlcntusmusi00000006> artists on tour at TourTracker.com.




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