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garythomas8708(at)yahoo.c
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 Posted: Wed Dec 31, 2008 5:25 am Post subject: flap alignment |
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I got to put my flaps on the plane the other day. The plans say that there should be a 6mm gap between the top of the flap and the rear wing spar. I can see using a straight edge that this gap gets the flap nice and lined up with the wing.
The problem - after a lot of care in lining up all the components, I still don't have the two flaps level. The best I can get is to have one of them off by 4mm and the other off by 8mm.
Has anyone else been through this or talked to Zenith? I'm not sure how close is good enough. Would hate to go corkscrewing through the sky on the first flight
Gary
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed Dec 31, 2008 6:12 am Post subject: Re: flap alignment |
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By 4 & 8mm do you mean a total of 10 & 14mm gap?
If so you need to see which end is stopping the flap from coming up fully the inboard side or the outboard stop.
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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jaybannist(at)cs.com
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| Posted: Wed Dec 31, 2008 6:29 am Post subject: flap alignment |
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Gary,
If the flap control plates (6W1-3) are in identical positions on both flaps, alignment is then determined by the attachment of the flap control arm (6B19-3) on the flap control tubes. My instructions called for this connection to be drilled and bolted during the installation of the flap control system. I now believe that this should be done only after the wings and flaps are installed. There are simply too many critical variables, requiring a close tolerance, to be able to get this right without all the components in place. I misaligned the flap control arm by only a few degrees and did not discover it until I tried to set the flap limit switches. Because of the complex geometry of the system, the error prevents useful placement of the limit switches. At this point in the construction, I would have had to tear the airplane apart to fix it. My "work around" was to design and fabricate an extension to the flap control arm to correct the geometry.
In your case, one of the control tubes is not aligned with the other one. A 4mm difference at the top forward corner of the flap means almost a 1/2" difference at the trailing edge of the flaps. In my estimation, that is too much, and should be corrected. It may be possible to remove the bolt from the inboard side of the flap control arm (because that one is longer and more accessible), rotate the tube for proper flap alignment and drill another bolt hole. In any case, I would check with ZAC to see if that is OK.
Jay in Dallas
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tonyplane(at)bellsouth.ne
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| Posted: Wed Dec 31, 2008 8:16 am Post subject: flap alignment |
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Gary,
Although it has been about 3 1/2 years, since I fitted my flaps, I recall I
also had a slight flap split. I built to the 6W1 02/03 revision which only
had a single 0.025 in hole in the 6W1-3 nylon control plate. I removed the
existing -3 plate on one of the flaps and made a new plate (I think I had to
make two to get it just right) with the 0.025 in. hole relocated so to align
with the other flap's position. I reinstalled the plate picking up the
existing fastener locations (although I had installed a doubler plate in the
area while building to give better load distribution). If you are building
to the latest drawings, which had a 0.025 in.
x 15mm slot, vice a hole, to pick up the flap actuator control arm "rod", I
would think revising the slot as required in a new 6W1-3 control plate would
work, but recommend check with Zenith.
Tony Graziano
XL/Jab; N493TG; 456 hrs
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