wrote: Has there been a compilation of data from folks spinning various = sizes of fence posts with known HP engines? Results corrected to sea = level standard day and all of that? Where did this come from? Thank you. Lynn E. Hanover -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_001F_01CB62D5.634F7960 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Andrew,

I like Lynn's "spinning fence posts" = analogy, goes=20 with "looking for apex seals in the exhaust "statement.

Anyhow I digress, I believe this = calculation is=20 helpful for a information you are seeking, however it's dependent = on good=20 information going into the process - you know what they say, sh.. in=20 sh..out.

I do believe your 190 hp is a bit = ambitious, from a=20 conservative stand point I would look at entering 180 hp ( might not be = much=20 difference, but worth a look-see.) Also I believe 6,800 rpm might be too = high=20 for static rpm, if your max rpm is 7,000 - I would put in 6,000 rpm into = that=20 slot and see how the numbers fall.

From memory I believe your running a = smaller 3=20 blade prop, I don't know how that compares to a 2 blade "fence post", = certainly=20 the Prop rpm would be higher, however it might be better to keep the = inputs to a=20 projected 2 blade configuration for the calculations and then compare = the 3=20 blade performance numbers against your results.

George (down under)

Probably=20 not, I guess this method died out with the introduction of modern = dyno=92s as=20 they measure over a range of rpm=92s.

french engineer Alexandre-Gustave Eiffel apparently figured = it out=20 100 years ago.

google just found part of the spreadsheet without copyright, so = posted it=20 here.

Andrew

On Sat, Oct 2, 2010 at 8:36 PM, <Lehanover@aol.com> = wrote:

Has there been a compilation of data from folks spinning = various sizes=20 of fence posts with known HP engines? Results corrected to sea level = standard day and all of that?

Where did this come from?

Thank you.

Lynn E. = Hanover

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