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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Military/History Related Hobbies > Alternate Timelines > Xtreme Alternate History

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Xtreme Alternate History Alternatives to History with No Holds Barred!

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  #1  
Old 26 Dec 15, 17:26
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Dracoco Dracoco is offline
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Dracoco has a little shameless behaviour in the past [-1 to -99]
Using the Boundary Layer to Gain Effective Wing & Propeller Blade Area.

During WW I Ludwig Prandtl identified the boundary layer and discovered that wires and struts produce much more drag than would be expected from their small frontal areas, making a strong case for wireless monoplanes (however, with modern materials and wingtip tanks, cantilever biplanes or triplanes without wires or struts can be made very aerodynamic). A small wire produces more drag than expected, because some air adheres to it, increasing the effective diameter (boundary layer), around which the air has to flow. Accordinly, the Fokker D.VII eliminated the wire stays between the wings with welded steel tubing N struts.

Because most current private plane wings are large, the boundary layer has a negligible effect on wing area. However, if a higher wing loading & multiple, narrow, tandem wings are used instead of a single large wing, the greater effect of the boundary layer will result in a larger effective wing area than the actual wing area. Moreover, since in laminar flow the boundary layer is thicker at low speed & sea level than at high speed & 11,000 ft, the plane has a very slightly larger effective wing area during TO than at cruising speed.

By extension, since a propeller blade is just a rotating wing, a prop with 4 fold the number of blades (each blade 1/4 as wide as in the original prop) will have the same total area but a higher effective area, owing to the greater effect of the boundary layer.
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  #2  
Old 26 Dec 15, 20:01
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johns624 johns624 is offline
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So, who cares? Take your theories to Cessna and Beech. I'm sure that they will be as entertained as we are by your military scenarios.
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  #3  
Old 26 Dec 15, 20:53
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Dracoco Dracoco is offline
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Dracoco has a little shameless behaviour in the past [-1 to -99]
If You don't care bugger off. I wasted time repeating that the plane was pressurized after You claimed to have been waiting for months for the answer. I don't waste time telling people how uninteresting their threads are & suggest You do the same.

BTW the companies You mention are much more concerned about coping with frivolous law suits than about coping with the laws of physics (innovation). Strangely, they did invest an enormous amount developing an expensive & completely impractical Rutan design, which didn't sell.

Last edited by Dracoco; 26 Dec 15 at 21:05..
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  #4  
Old 29 Dec 15, 02:06
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Tyramon Tyramon is offline
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Tyramon is on the path to success [1-99]
What is your flawed point?
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  #5  
Old 29 Dec 15, 09:58
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johns624 johns624 is offline
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Originally Posted by Tyramon View Post
What is your flawed point?
Drano doesn't have points. He just spews written diarrhea.
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  #6  
Old 31 Dec 15, 11:34
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Karri Karri is online now
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No need for such hostility. But I do agree; what is your point?
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  #7  
Old 31 Dec 15, 15:57
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No need for such hostility. But I do agree; what is your point?
You're obviously not aware of Draco/Dracoco's history...
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