[MHml] any foil devil's advocates?
tonybull at san.rr.com
Thu Jun 8 06:18:59 EST 2006
At 3:39 PM -0400 6/7/06, Tony Hammer wrote:
>This is also what I have been told by a couple of those who should know
>(aeronautical engineer sailing types) and that an 8-9 % max thickness to
>a section would help reduce airation (water has to make less of an
>excursion laterally when passing by, and less resistance) -even if in
>theory it stalls earlier.
>4-5:1 aspect ratio without any counerbalance works well.
>Apparently concave surfaces aft of the max thickness ("bucket") are
>thought to provide a smoother "exit" for the flow leaving the foil too,
>but not a big deal.
Fluid dynamics fundis don't have to make these foils though! Sure, a
nice thin foil with high AR and some concavity aft sounds fine and
dandy, but Bill wants it to be 64" long with a 12' chord AND still
withstand all Afterburner's rig will demand of it without breaking.
Somewhere the materials scientists need to let us know when we are
pushing the limits.
Rob or Evan care to comment??
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