[NSRCA-discussion] Cooling/spinners

[Nat Penton]

Brett
>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.
                                        Nat
  ----- Original Message ----- 
  From: brett terry 
  To: NSRCA Mailing List 
  Sent: Monday, February 20, 2006 2:19 PM
  Subject: Re: [NSRCA-discussion] Cooling/spinners


  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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