Prop Formula

[George Kennie]

Yeah,
And Disc area and multiple-blade drag increases and I don't have a
clue about what I'm talking
about...............................duhhh.

Nat Penton wrote:

>   The formulas that I am aware of do not seem to work for
> selecting props of equal power consumption. One reason for the
> problem may be inaccurate rpm assumptions. A 6% error in rpm would
> account for a 19% change in power ( 1.06 cubed ). Another possible
> reason might be reynolds effects, particularly when going from a
> two to a four blade. Anyway, I will continue to support the
> economy!


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