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<DIV><FONT face=Arial size=2>Brett</FONT></DIV>
<DIV><FONT face=Arial size=2>From Boucher's power equation we can determine the
volume ( cu ft / sec ) generated by a propeller. In the case of the
spinner, where centrifugal forces are doing the work, not sure how to handle it.
It is probably in the text books.</FONT></DIV>
<DIV><FONT face=Arial
size=2>
Nat</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=brett.terry@gmail.com href="mailto:brett.terry@gmail.com">brett
terry</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 20, 2006 2:19
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
Cooling/spinners</DIV>
<DIV><BR></DIV>power is a function of the cube of RPM in thousands, accd to
Bob Boucher (Astro Flight).<BR><BR>The equation is this: Power = (Pitch
in inches)*(RPM in thousands)^3*(Diameter in inches)^4*k, where k is a
variable constant usually ranging from about 1.0 to 1.2 (APC = 1.15
IIRC).<BR><BR><BR><BR>
<DIV><SPAN class=gmail_quote>On 2/20/06, <B class=gmail_sendername>Nat
Penton</B> <<A
href="mailto:natpenton@centurytel.net">natpenton@centurytel.net</A>>
wrote:</SPAN>
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style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV><FONT face=Arial size=2>As Matt mentioned, the only way to use the
spinner as an effective air mover is as a cetrifugal blower. This
would call for an open nose, and the need for properly
shaped vanes (as a third part ?).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As I recall, power consumption ( volume ? ) is
a function of the cube of the RPM. I need help here, its only been 60
years.
Nat</FONT></DIV><BR>Internal Virus Database is out-of-date.<BR>Checked by
AVG Free Edition.<BR>Version: 7.1.375 / Virus Database: 267.15.6/257 -
Release Date:
2/10/2006<BR><BR><BR>_______________________________________________<BR>NSRCA-discussion
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<P></P>Internal Virus Database is out-of-date.<BR>Checked by AVG Free
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