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zsmith3rd(at)earthlink.ne
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 Posted: Wed Feb 25, 2009 2:41 pm Post subject: More Extended Wings |
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do not archive
No, I was just wonderig if you had the one-piece factory struts.
If you had,and extended the wings inboard of the standard attach points you'd have a bit of a dihedral problem.
Not my project, but I'd give serious thought to building as CH drew it.....adding inboard changes the angle of the struts, and might be a reason to re-calculate the wing loading....and that may not be the proper terminology.
Possibly some other List member with a slide rule can offer advice.
Otherwise, enjoy pulling rivets.
Zed
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stepinwolf
Joined: 21 Jan 2008
Posts: 133
Location: Canada
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| Posted: Wed Feb 25, 2009 3:21 pm Post subject: More Extended Wings |
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Zed,
The reason I decided to extend it inboard, rather then at the wing tip, is just for the safety factor. Once the modification is completed, I will have the exact same wing surface area as the regular wing, outboard of the struts. As for the dihedral, once the wings are installed, it will be adjusted to the exact same angle, as a regular wing.
I also reinforced a few of the major parts that make up the wing, so my guess is that the extended wing, will most certainly be stronger then the basic 701 wing.
Here are just a few of the changes.
Spar web is cut in .032 rather then the .025
Spar caps are 3/4 x 3/4 x .125 radiused on the inside
Web and root doublers, have both been made in .040
All the covering top/bottom, is being done in .020 rather then the required .016
There will be a slight weight penalty with the above, but the additional surface area, will more then compensate for the extra weight.
There will however be some additional angle work to do to both the strut attachment points, but nothing that would cause any stress to the parts themselves, just a slightly different mounting angle.
If you search around the web, you will see that there are dozens of 701's that have had their the wings extended, and all of them are flying with no ill effect, or anomalies what so ever.
During a phone call to Calibe at the factory a few weeks ago, I informed him of my intentions to extend wing, and here was his response.
He said that it would not be a problem to build in an extension to the 701 wing, or I could just build it initially to the extended length.
Always happy to exchange a few ideas, and pull some rivets, which BTW is what I will be doing this evening.
Regards
Robert Pelland
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