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4hv.org :: Forums :: General Chatting
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Boats/Submarines and the HP of the motor to speed of the craft

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Ash Small
Wed Dec 24 2014, 11:38AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
The 'XFOIL' program we're looking at in the 'copter thread also works with NACA hydrofoil profiles, etc. as well, apparently.

The hydrofoil sections are basically the shape you want for a sub wink
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Andy
Wed Dec 24 2014, 09:55PM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi Ash

Is the Xfoil program from a .edu site? . Been thinking and looking at large fish and stuff, they all seem to have a flat bottom and rounded top, like that cigar boat, but upside down, might be a interesting thing to model.
Got a Reed engineering book out that has alot of mathematical formulas with data on visority and flow/pressure/cavitation etc.

Just working on the motor at the moment and know and again bouncing back to this thread. Link2

Cheers
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Ash Small
Wed Dec 24 2014, 10:37PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
The XFOIL program is open source, as far as I can tell, and is supported by MIT and the US Navy, as far as I can tell. It's been under development for ~30 years, and they've 'got rid of the bugs'. You can google for yourself that it's proven to be accurate, within parameters.

I'll post some relevant links when I have some free time wink

EDIT: Link2
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