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planecrazydld(at)yahoo.co
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 Posted: Thu Jan 03, 2008 8:17 am Post subject: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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I beleive that I am one of the original "doubters" on the XL wing but even I agree with what has been stated multiple times very succinctly by various posters: the design is good; just build it to print using best aerospace industry practices, don't cut any corners, don't take any shortcuts, and fly it by the numbers. Any certified, production aircraft has questions when any of those areas are compromised as well.
Chris Heintz is no dummy and he has great integrity.
ashontz <ashontz(at)nbme.org> wrote:
[quote]--> Zenith-List message posted by: "ashontz"
Here's an interesting idea, how about mounting a laser light inside the wing that shoots from the wing root near the front on the wing down to the front outboard tip of the wing thought the lightening holes to a 45 degree mirror [quote][b]
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MaxNr(at)aol.com
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| Posted: Fri Jan 04, 2008 2:15 pm Post subject: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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Lasers? I like that. Something like that thingie under the muzzle of the M1 Tank. My son told me that it reflected a laser to measure barrel bending. Never thought that was a problem. Do you want to see wing flutter? I did a YouTube search for "Wing Flutter" and came up with a bunch. Take a look at a few.
http://www.youtube.com/watch?v=kQI3AWpTWhM (Sailplane)
http://www.youtube.com/watch?v=ca4PgyBJAzM&feature=related (B-747)
http://www.youtube.com/watch?v=8D7YCCLGu5Y&feature=related (A-6)
Would it work better mounted externally like the thingie on the M1 tank? How about LED's on the tip at each spar to measure twist also? Many of us sat through those management classes on "brainstorming" where you get 2 minutes to find as many possible uses for a paper clip. The [u]only rule is that no one disparages any idea. Its a wet blanket on problem solving. We seem to be in search of a solution to what may not even be a problem. There are reports out there without a lot of details and many are concerned. The few accidents were reported without much detail. One seemed to me to be improper or non installation of the rear spar attach bolt. Info is thin. Fill me in, please. Another, in the UK appeared to be improper use of the controls. The pilot exceeded limits with an abrupt elevator input at high speed. The scanty report that I saw does not even qualify as a report in my opinion. I have confidence in the design as it is. I did offer my $.02 that if some have doubts, that the structure could be beefed up. Cessna up graded C-150's to aerobatic certification with heavier skins and rivets The V-35 Bonanza has been beefed up a lot since 1947. I did some very hasty calculations that to go up to the next size sheet on the wings would cost 23 pounds of weight. I did not even consider all the scrap and trimming. Its called Monocoque for a reason. Not that I would bother doing it. I'm happy with the design. In fact, it may even pass muster covered in fabric. Just kidding. Also, I have flown many A/C that had repairs made to them using the next size skins. These were in air carrier service and were approved by every one in sight. People, lets get along and dial it back a little, or I'll start asking questions about the spin recovery qualities of the 601 series. Stall/spin is statistically a bigger killer than in flight break up. Any questions? contact me directly.
Bob Dingley
Pace, FL
XL/Lyc Do not archive[/u]
**************
Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489 [quote][b]
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planecrazydld(at)yahoo.co
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| Posted: Fri Jan 04, 2008 3:23 pm Post subject: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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do not archive
When I was a little liaison engineer in structures at the Wallace Division of Cessna (Business twins, jets, and military) we were told that an Aerobat was simply a standard C-150 with zero wing and tail deficiencies. I do not know if that is true or not - but I do know thta we rerely built a twin, jet or military panel without at least one "biggie" that had to be evaluated by stress engineering...
MaxNr(at)aol.com wrote:
| Quote: | ...Cessna up graded C-150's to aerobatic certification with heavier skins and rivets...
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Dave Downey
Harleysville (SE) PA
100 HP Corvair
Be a better friend, newshound, and [quote][b]
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