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austria
Joined: 09 Feb 2007
Posts: 7
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 Posted: Mon May 14, 2007 11:29 am Post subject: just a consideration |
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I am a flight engineer with more than 30 years expierience, and I know that all rudders have to be balanced.
601 XL rudders (rudder, aileron, elevator) are not balanced. You have to attach a lot of weight on the rudders for balancing to avoid shimming.
Maybe it is a reason for the seperaton of the wings in special conditions.
Just a consideration.
FS from AUT
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Kurt.Schumacher(at)schumi
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| Posted: Mon May 14, 2007 1:39 pm Post subject: just a consideration |
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Hallo FS,
Correct by rule of thumb. Then please consider balancing the flaps, new on
the XL, too. Incidentally, any rudder-like add-on can lead to shimmy and
later flutter. Face it - even with adding punctual counterweights to have
statically balanced rudders does not protect from torosional flutter of the
rudders. Once over, the story starts again.
Testing even this (relative simple) and low speed airframe would be much
more complex than just a static wing load. Should be done with and without
the aerodynamic influence...
| Quote: | From all the interesting theories and ideas, we have seen here on the list
these days on design and static testing, I do not intend to go into the
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dynamics of flutter here.
Under the line, every non-factory built aircraft should been taken to a
careful flight test program, including Vne+plus_some, CoG in the extremes...
And factory built aircraft should run over such a process on a regular
interval with the series production.
Grüsse aus der Schweiz!
-Kurt.
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gboothe5(at)comcast.net
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| Posted: Mon May 14, 2007 1:58 pm Post subject: just a consideration |
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Anybody run this by CH? I'm sure we could all come up with a dozen examples
of A/C without balanced control surfaces. My hat off to a 30 year Flight
Engineer, but the antique Pietenpol (1928) has no balanced surfaces. I'm
willing to bet that Vne has something to do with it, but, then, I'm not the
Designer of the aircraft.
Gary Boothe
Cool, CA
601 HDSTD, WW Conversion 90% done,
Tail done, wings done, working on c-section
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amyvega2005(at)earthlink.
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| Posted: Mon May 14, 2007 3:34 pm Post subject: just a consideration |
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i dont recall a j3 cub having balanced surfaces,
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JohnDRead(at)aol.com
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| Posted: Mon May 14, 2007 4:27 pm Post subject: just a consideration |
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Better not tell that to Piper cub fliers.
John Read
See what's free at AOL.com.
[quote][b]
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Matt Ronics
Joined: 30 Apr 2007
Posts: 22
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| Posted: Mon May 14, 2007 6:26 pm Post subject: Re: just a consideration |
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The KR series as designed does not balance the tail and several of the breed have flown over 200mph (listed VNE). Not that I'd do it, but emperic evidence nonetheless.
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Mon May 14, 2007 11:57 pm Post subject: Re: just a consideration |
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Fastback Cessna 150s don't have balance in the tails either, 150 series thru 150C model. Also, the 601 rudder, being similar to my 701, is at least partly aerodynamically and possibly mass balanced due to the position of the hinge axis? I dont see any issues there. I did sit up and take notice of the 'washboarding' wing vibrations reported on this forum a few months back to an XL, dismissed at the time as being likely caused by heat efflux from a powerplant below.
Ralph
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Ralph - CH701 / 2200a |
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badbob
Joined: 07 Jan 2007
Posts: 8
Location: Willamina, Oregon
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| Posted: Tue May 15, 2007 4:01 am Post subject: just a consideration |
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I have had my Cassutt to WELL over 200 knots in a dive. Neither the rudder or elevator is balanced.
Do not archive.
Bob Johnson
badbob0007(at)earthlink.net
[quote][b]
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_________________
Bob Johnson
601XL scratch built.
badbob0007(at)earthlink.net |
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