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reinagreaves(at)comcast.n
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 Posted: Mon Jun 11, 2007 4:47 pm Post subject: Warped tanks? |
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I am in the process of installing my fuel tanks on my 7. I trimmed them down to clear the reinforcement strips. The washout and dihedral are all set. When I put the tanks on the spars, they don't go down flush with the ribcaps on either side of each and the outer trailing edge corner of each tank sticks up about 1/4". They are only touching the rear spar on the inboard corner. Is this a bit abnormal? Am I supposed to not get them down flush with the rib caps? I was assuming they should drop right down evenly on the spars and be flush with the ribs.
Thanks,
Wade Greaves
[quote][b]
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eskflyer
Joined: 24 May 2007
Posts: 44
Location: AK
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| Posted: Mon Jun 11, 2007 6:21 pm Post subject: Re: Warped tanks? |
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Can you post a pic of it and then we miught be able to see and help some more on what the problem may be .
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_________________
FLY FUN FLY LOW FLY SLOW
John Perry
Kitfox 2 N718PD
582 cbox 2:62-1 IVO IFA
1220 Full Lotus |
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N81JG(at)AOL.COM
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| Posted: Mon Jun 11, 2007 9:34 pm Post subject: Warped tanks? |
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Hi Wade,
I talked to Rex today about your tanks. He suggested setting them down on the floor or table and laying the Smart level in the spare grooves front and rear. They should have some angle up at the rear from root outward to allow for the washout in the wings. However when they are placed on the spars with the correct washout set they should lay down and be even with the top of the ribstrips inboard and outboard as we spoke about. He asked about the left and right switch, but I told him the drains are inboard. I wonder if Skystar drilled the drains at the wrong ends and left and right are switched. Worth a try on changing sides to see. Are you sure the washout is set correctly? Though I cannot see how the washout could have that much effect at the roots. John McBean will probably have an answer for you before I get there. If the tanks are warped (unlikely since they are cured glass and both would not warp exactly the same) or drilled opposite McBean should replace them. Regardless, we will solve the problem.
Saw Ryan Denham last week and he asked me to say hello to you. He has two kids now and seems very happy with his managerial job at the auto dealership. He would like to see you next time you are here. Maybe we can have he and his wife out to dinner when you and Jenn are here.
Rex and I are sanding the fiberglass fairing around the front of the canopy. It brings back memories of the fiberglass dust with the VariEze. I haven't lost my touch with fiberglass work. The fairing is turning out nice.
We will fill the weave tomorrow and sand it out for priming, then on to the wiring. I talked to Jennifer Hickman at AFS today and I will be able to pick up my AF3500 this week at their new facility in the industrial area behind Mervyns in Canby. They have 5 times the space they had at Deitz Airpark. Vans has really started a thriving industry in aircraft and all the related systems such as avionics, upholstery, painting and even engines. Lycoming has discovered that there is a complete new industry in homebuilt engines primarily due to the growth of RV's. 450 RV's coming out of garages each year is a huge business for engine companies, etc.
David Carter passed his crucial stockbroker exam last week. He has two smaller exams in the next month before he is certified. I know he will do well, he has a talent for working with people.
Enjoy the flying.
Love, Dad
See what's free at AOL.com.
[quote][b]
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N81JG(at)aol.com
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| Posted: Mon Jun 11, 2007 9:38 pm Post subject: Warped tanks? |
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Hi Wade,
Just noted an e-mail from John McBean to Lowell Fitt at Cameron Airpark. The annual Kitfox flyin was this past weekend. John was at the flyin may have been tied up and not able to answer your e-mail till this week.
Dad
See what's free at AOL.com.
[quote][b]
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N81JG(at)aol.com
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| Posted: Mon Jun 11, 2007 9:38 pm Post subject: Warped tanks? |
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See what's free at AOL.com.
[quote][b]
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N81JG(at)aol.com
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| Posted: Mon Jun 11, 2007 9:39 pm Post subject: Warped tanks? |
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See what's free at AOL.com.
[quote][b]
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Tue Jun 12, 2007 9:38 am Post subject: Warped tanks? |
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At 05:47 PM 6/11/2007, you wrote:
| Quote: | | When I put the tanks on the spars, they don't go down flush with the ribcaps on either side of each and the outer trailing edge corner of each tank sticks up about 1/4". They are only touching the rear spar on the inboard corner. Is this a bit abnormal? Am I supposed to not get them down flush with the rib caps? I was assuming they should drop right down evenly on the spars and be flush with the ribs. |
You're right, they're supposed to be even or below the rip caps on each end and from what I understand will lay close to each spar front and rear. (In the IV there were gaps between the spar and tank viewed from the bottom, but the tank flange laid on the spars along their entire length.) It is possible you've got incorrectly assembled tanks. This would be possible if the tank tops were bonded on with a twist in the tank. It's odd, though, that both tanks are the same. It's also interesting that there should be nearly 0.11" of wash-out at the end of the tank, based on 1/2" of washout at 156" per the manual. If you built the wings with wash-in instead of wash-out the error would be 0.22" at the corner of the tank, very close to the 1/4" you're seeing. I suppose it is also possible they assembled the tanks reversed in the jigs.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar. [quote][b]
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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lcfitt(at)sbcglobal.net
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| Posted: Tue Jun 12, 2007 10:36 am Post subject: Warped tanks? |
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Guy's response is similar to my thoughts. When I built, I had two tanks
built for the left wing with enough twist to accommodate the wing twist.
The problem arose when they positioned the filler neck. It suggested that
one tank was a right wing tank. It rocked severely on the right wing. I
had to have it exchanged. The replacement fit fine.
As I read the original post, I tried to visualize the rocking and it seems
that the tank is twisted in the proper direction, but excessive. I may be
wrong in that, but when the tanks are mated up and top and bottom are
bonded, they must be jigged during curing to get the desired shape as the
two pieces are not sufficiently stiff to arrive at a predictable final
twist.
Lowell Fitt
Cameron Park, CA
Model IV-1200 R-912 UL Warp
1998 870 hrs.
---
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jdmcbean(at)kitfoxaircraf
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| Posted: Tue Jun 12, 2007 2:25 pm Post subject: Warped tanks? |
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OK… Just to clarify.. It is not uncommon for the tanks to sit above the capstrips.. Sometimes one either builds the capstrips up or just leaves it alone… some have gone to the length of installing another capstrip on top and sanding it down to match the tank flange. If the tanks are placed in the wing and they do not rock from corner to corner then the twist is pretty close.. about an 1/8” rock is not uncommon. At the leading edge there is an allowance for the spar reinforcement bracket that sits up high as well.
<![if !supportEmptyParas]> <![endif]>
Just a few pics of one.
<![if !supportEmptyParas]> <![endif]>
<![if !supportEmptyParas]> <![endif]>
AUTOTEXTLIST \s "E-mail Signature" <![endif]-->Fly Safe !!
John & Debra McBean
208.337.5111
www.kitfoxaircraft.com
"It's not how Fast... It's how Fun!"
<![endif]--><![if !supportEmptyParas]> <![endif]>
-----Original Message-----
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com]On Behalf Of Greaves
Sent: Monday, June 11, 2007 6:47 PM
To: kitfox-list(at)matronics.com
Subject: Warped tanks?
<![if !supportEmptyParas]> <![endif]>
I am in the process of installing my fuel tanks on my 7. I trimmed them down to clear the reinforcement strips. The washout and dihedral are all set. When I put the tanks on the spars, they don't go down flush with the ribcaps on either side of each and the outer trailing edge corner of each tank sticks up about 1/4". They are only touching the rear spar on the inboard corner. Is this a bit abnormal? Am I supposed to not get them down flush with the rib caps? I was assuming they should drop right down evenly on the spars and be flush with the ribs.
Thanks,
Wade Greaves
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