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richard_trickel(at)yahoo.
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PostPosted: Fri Jul 16, 2010 10:41 am    Post subject: flap Reply with quote

Mark
|What is a zap (flap)
Rich
--- On Fri, 7/16/10, Mark Kettering <mantafs(at)earthlink.net> wrote:

[quote]
From: Mark Kettering <mantafs(at)earthlink.net>
Subject: Re: SV: SV: Picture of fillet
To: kis-list(at)matronics.com
Date: Friday, July 16, 2010, 4:01 PM

--> KIS-List message posted by: Mark Kettering <mantafs(at)earthlink.net (mantafs(at)earthlink.net)>

Hello Hans,

I also don't like to fly in the prestall buffeting or wallowing. I think this gives me a warning that helps keep me at a safe margin above stall speed.

I also do not know if better wing root fairings will help reduce this. At times these sort of detail things are very hard to predict. If you do not mind spending the time and effort, give them a try. They do look good! I think they could slightly reduce cruise drag. If they reduce or eliminate the prestall buffeting I think that would not be a good thing but then you can add stall strips if needed.

If you are trying to reduced landing distance I would try some other things first. I think the flaps would be more effective if deflected up to 45 degrees. Not only will this increase the lift but it will also increase drag and slightly lower angle of attack. This should allow slight better approaches at a slightly lower speed. Next I would try to improve the brakes if they are not perfectly effective.

If you are really into changing things a much larger change would be the addition of a belly flap under the fuselage that extends from the flap on one side to the flap on the other side. If you are really up for a big change I would think about replacing the flaps with split flaps. Split flaps actually are more effective providing lift and higher lift to drag than plain (like we have) flaps and single slotted flaps. Split (or maybe even zap) flaps would have been my choice if I designed a plane like this.

Mark

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mantafs(at)earthlink.net
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PostPosted: Sat Jul 17, 2010 5:33 am    Post subject: flap Reply with quote

Hello Rich,

A Zap flap is a split flap where the hinge point also moves aft. Here is a diagram: http://www.answers.com/topic/zap-flaps

A well done slotted flap is about 5% better than a plain flap (like on the TR1), a split flap is about 10% better than a slotted flap and a Zap flap is about 10% better than a split flap. On the TR1 a Zap flap would reduce stall and landing speed about 5+ knots.

A Zap flap is about the same as a well done single slot Fowler flap. Both are about the same complexity to make but the Zap has nothing critical. With a Fowler the slot size and shape is critical and if not done correctly is not as good as a Zap.

Mark


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