dpfisher(at)scottsbluff.n
Guest
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 Posted: Mon Feb 19, 2007 9:35 pm Post subject: 701 long wing |
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At 12:58 AM 2/17/2007, you wrote:
| Quote: | Does anyone have any information on the construction of the longer
wing??
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Hi John and list,
I don't know how the European long wing for the 701 is made, but I have a
sketch from Chris H in answer to my request to stretch each wing by one
foot. His note says: "To retain full strength the web doubler 7V2-6SP
should be T = .040 ( instead of .032) and longer."
The sketch shows the web doubler made longer by a minimum of 160 mm.( 80
mm inboard and 80 mm outboard.) The top outboard corner has an AN3 bolt
with an AD-4 rivet inboard of it on the 80mm extension. There are also two
AD-4 rivets on each of the other three corners of the new web doubler.
My sketch is several years old and I'm sure that Zenith has done work on
the new CH750 since then so they should have better and more complete
information now. My advice would be to contact Zenith and request approval
and advice on the mod you are considering.
Chris's note doesn't address the details of adding a foot to each wing .
If I do the mod, my plan is to rebuild the wings from the last rib on out
and I'll add a rib.
My situation is that my field elevation is 4000 ft. and I'd like to operate
at altitudes that approach the service ceiling of the 701. My power is an
old A80-8 Continental which is also anemic at high altitudes. I think the
extra wing area will help so I'm seriously considering the mod.
If you've got lots of horses up front or are operating at lower altitudes,
I'm not sure that the mod makes sense as the 701 seems to be a well
balanced airplane as it is.
The down side to any mod , of course , is that you'll add weight and much
time to the project and you'll be the test pilot on the prototype, so you
won't have the safety cushion that you get from a proven design with lots
of safe hours.
Please let me know what you decide to do.
Good Luck!
Dave, 701 with A80-8 Continental
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