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byoungplumbing(at)gmail.c
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 Posted: Sat Mar 31, 2012 10:30 am Post subject: wing stall |
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and then at 2-3 MPH slower, the whole wing has stalled.
somewhere in the back of my mind, there has been a statement that because of the dimensions of the wing cord, aspect ratio of the wing, interaction of the wing with the fuselage, or some other reason, the wing would stall at the inboard ends before the wing tips. I don't know how that was determined, was it tufting and testing, or a aerodynamic text book solution to the situation.
can anyone help with clearing this up in my mind.
boyd young
mkiii
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Sat Mar 31, 2012 4:43 pm Post subject: wing stall |
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A straight rectangular wing, though somewhat less efficient from an induced drag standpoint than a tapered or elliptical wing, still has a more or less elliptical lift distribution. This means that the tips are more lightly loaded than the tips... due to tip effects the local AOA is a bit less, so the root tends to stall first. This is why, for example, the Taylorcraft (which uses the supposedly nasty sharp stalling 23012 airfoil) actually has a rather benign stall. Kolbs, too, have a rather sharp leading edge (sharp leading edge usually means abrupt stall), but because the wing doesn't stall all at once it's not that bad.
The so-called "Kolb quit" is, I suspect, more a function of the planes low mass, so it slows up rapidly as it stalls. Even though many pilots have bent their Kolbs by flaring a bit too high, the center still stalls first and few (as far as I've heard) have had a really bad tipstall related crash while landing.
-Dana
At 02:26 PM 3/31/2012, b young wrote:
| Quote: | --> Kolb-List message posted by: "b young" <byoungplumbing(at)gmail.com>
and then at 2-3 MPH slower, the whole wing has stalled.
>>>>>>>>>
somewhere in the back of my mind, there has been a statement that because of the dimensions of the wing cord, aspect ratio of the wing, interaction of the wing with the fuselage, or some other reason, the wing would stall at the inboard ends before the wing tips. I don't know how that was determined, was it tufting and testing, or a aerodynamic text book solution to the situation.
can anyone help with clearing this up in my mind. |
--
Money does not buy happiness. But poverty really sucks.
[quote][b]
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Mar 31, 2012 6:46 pm Post subject: wing stall |
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somewhere in the back of my mind, there has been a statement that because
of the dimensions of the wing cord, aspect ratio of the wing, interaction
of the wing with the fuselage, or some other reason, the wing would stall at
the inboard ends before the wing tips. I don't know how that was
determined, was it tufting and testing, or a aerodynamic text book solution
to the situation.
can anyone help with clearing this up in my mind.
boyd young
mkiii
Boyd/Kolbers:
The Kolb wing, all models, stalls inboard first. One of the reasons we can
put them into a very controllable mush/stall with roll and pitch control.
john h
mkIII
Titus, Alabama
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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pj.ladd(at)btinternet.com
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| Posted: Sun Apr 01, 2012 5:07 am Post subject: wing stall |
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can anyone help with clearing this up in my mind. >>
Just off the top of my head.
The problem you are talking about is nothing whatever to do with the
dimensions of the wing, ratios or anything else you mentioned.
It is a twist put in the wing called `washout`(which is usually desirable)
or `wash in` which is not.
It merely means that the wing is built with a twist so that the angle of
attack varies along the length of the wing and consequently a wing will
stall bit by bit along its length and not just dump all the lift the wing is
generating in one fell swoop.
There is a case of at least one major airplane type which was rescued from
the wreckers yard as being too dangerous to fly when it was realised that
during the building the `washout` built in by the designer was turned in to
`washout` in error.
Cheers
Pat
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