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pc.king(at)comcast.net
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 Posted: Sun Nov 08, 2009 4:57 am Post subject: solid vs fabric leading edge |
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Has anyone built a Kolb with a solid leading edge? The variable airfoil caused by fabric draping between the ribs can't be good for performance. Is the difference significant?
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slyck(at)frontiernet.net
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| Posted: Sun Nov 08, 2009 7:05 am Post subject: solid vs fabric leading edge |
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yes, myself included.and no, the variable airfoil does not diminish the performance. In fact it does reduce the wing thickness (and drag) by a small percentage.
and IMO likely helps retain air attachment.
I have leading edge tin on the top surface only. It does reinforce the ribs without the use of additional L struts.
BB
On 8, Nov 2009, at 7:56 AM, PCKing wrote:
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Has anyone built a Kolb with a solid leading edge? The variable airfoil caused by fabric draping between the ribs can't be good for performance. Is the difference significant?
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sun Nov 08, 2009 8:15 am Post subject: Solid vs fabric leading edge |
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I found NACA TN 428 "CHARACTERISTICS OF AN AIRFOIL AS AFFECTED BY FABRIC SAG" dated 1932. Here's the summary.
"The results of these tests indicate that the usual
sagging of the wing covering between ribs has a very small
effect on the aerodynamic characteristics of an airfoil."
Rick Girard
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon Nov 09, 2009 4:53 am Post subject: Re: solid vs fabric leading edge |
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Rick,
Did the 1932 study indicate the nature of the slight difference in performance? I.E., stall slower/higher, cruise speed slower higher, etc.
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Nov 09, 2009 9:19 am Post subject: solid vs fabric leading edge |
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No, it was a wind tunnel investigation.
Rick
On Mon, Nov 9, 2009 at 6:53 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
| Quote: | --> Kolb-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
Rick,
Did the 1932 study indicate the nature of the slight difference in performance? I.E., stall slower/higher, cruise speed slower higher, etc.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x31
Life is pleasant. Death is peaceful. It's the transition that's troublesome.
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