Author Topic: AERO  (Read 11156 times)

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Offline yarp

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Re: AERO
« Reply #15 on: April 18, 2014, 09:01:32 PM »
They couldn't go any faster than 88 mph because whenever they did, they went back in time...

Jeff

ha!

Blue

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Re: AERO
« Reply #16 on: May 13, 2014, 01:09:34 PM »
This shape was optimized analytically for the velocity/pressure distributions at the chosen speed range of 80~85 mph. [Laminar flow thingy!] Add 100, 200 or 300 mph and it all changes.
Actually, until we get to much higher Rn the lowest drag shape will be a natural laminar flow design very close to a NACA 66xxx to 67xxx.  Above 100 million Rn, there's a small advantage to moving the max thickness point a little more forward.  Anyone building for up to 400 mph is well below this.

Above 500 mph, we're getting into transonics and that leads to super-critical airfoils with less laminar flow and flatter velocity profiles.  Supersonic, we go towards "bi-convex" airfoils to minimize wave drag.  In all of this, the separation drag at the rear and under the vehicle is the biggest area of improvement available for LSR. 

Offline tauruck

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Re: AERO
« Reply #17 on: May 16, 2014, 01:14:29 AM »
... I'm guessing 1,000+ watts average...
Maybe. I don't know if a human can apply about 1.5 HP or not.

Maybe for 8 furlongs...  :-D

Bob,  :-D :-D :-D