Aerodynamic Aids - What a drag, What’s your drag? |
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Aerodynamic Aids - What a drag, What’s your drag? |
chris914 |
Nov 1 2007, 05:30 AM
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#1
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Member Group: Members Posts: 489 Joined: 24-July 04 From: San Diego, CA Member No.: 2,393 Region Association: Southern California |
Have you made changes to your 914 body or are you thinking of it?
Here are a number of computer models comparing different body modifications to the 914 and the effects that they have on the cars aerodynamic drag. http://www.cassidy-online.com/porsche914/aerodynamic_aids |
Mikey914 |
Nov 3 2007, 11:48 AM
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#2
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The rubber man Group: Members Posts: 12,711 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
I agree, the wing must be suited for the application. In aircraft design, low speed 45-70mph the chord of the mean camber or thickness of the wing is on a curve that the slower it is effective, the thicker it will need to be. The real problem is that when lift is created (negative lift for this application) you also create Parasitic drag, now decreasing your top end speed.
If you were to use a wing it would have to be tuned specifically for the application for optimum benefit. Hence the $$$$$. The real solution would be to have a variable camber wing that was controlled by air pressure. This would be the easiest way to regulate the mean camber. The Helio courier is an excellent example of simple application of this concept, it is low tech, yet does some really incredible things. This aircraft has slats that drop down below 55 and when the air pressure is greater than 55 they roll back, buy airpressure. This allows the aircraft a minimum speed of about 30 mph, and it can cruse at 165 mph. With the exception of the top end these are the speeds that you would be operating at, and I bet the benefit of the changing geometry at about 55mph would also benefit. http://www.stolaircraft.com/ http://www.bush-planes.com/helio-courier.html For what it's worth. |
chris914 |
Nov 3 2007, 01:03 PM
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#3
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Member Group: Members Posts: 489 Joined: 24-July 04 From: San Diego, CA Member No.: 2,393 Region Association: Southern California |
The real solution would be to have a variable camber wing that was controlled by air pressure. This would be the easiest way to regulate the mean camber. The Helio courier is an excellent example of simple application of this concept, it is low tech, yet does some really incredible things. This aircraft has slats that drop down below 55 and when the air pressure is greater than 55 they roll back, buy airpressure. This allows the aircraft a minimum speed of about 30 mph, and it can cruse at 165 mph. With the exception of the top end these are the speeds that you would be operating at, and I bet the benefit of the changing geometry at about 55mph would also benefit. Hmm, now that might make a good fluids and controls project for the students. |
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