[NSRCA-discussion] Cooling/spinners

[brett terry]

power is a function of the cube of RPM in thousands, accd to Bob Boucher
(Astro Flight).

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).



On 2/20/06, Nat Penton <natpenton at centurytel.net> wrote:
>
> 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 ?).
>
> 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
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