[PUP] PPM- propellor efficiency

[Ross Anderson]

After reading the link that John provided I agree with the writers
observation on the need vs. cost of a Controllable pitch prop. My
experience with it on the 48' duck is similar. Save the money and you
can buy an additional 30 to 40K of fuel!! @ $3/gal that is
conservatively 10,000 gals and at 3 gals/hr translate into over 3000
hrs of cruising @ 7 kts and you can see the results of the savings!
God Bless - Ross 10&2

On Mon, Nov 24, 2008 at 7:18 AM,  <Truelove39 at aol.com> wrote:
> I  agree that a VPP is a luxury on a passagemaker. Unless  your lifestyle is
> to live aboard and cruise very long distances, I don't believe  you will ever
> recoup, in fuel savings, the cost of a VPP. OTOH,  if you cruise very long
> distances with a conventional setup you will likely  run at the most
> economical/practical speed 99% of the time and therefore  will not need a VPP. We find
> that operating at a reasonable speed results in the  best economy despite where
> we are on the BSFC curve. And, that curve  is very flat now, at normal
> continuous speed on newer turbo engines with  EFI.
>
> BTW,  it's interesting that Nordhavn has a VPP on their new 56' motorsailer.
> I have to  wonder why they chose to do this when most of us blow-boaters use a
> simple  feathering Martec or Max-prop, which works just fine whether sailing
> or motorsailing. Nordhavn touts their VPPs benefit compared to a fixed  prop,
> but not to a feathering one. Curious.
>
> Those interested  in one man's experience with a VPP may want to see:
>
> http://tinyurl.com/386r8v
>
> Regards,
>
> John
> "Seahorse"
>
>
>>  Regardless of what engine you have, ringing the optimum mpg from it is of
> the
> utmost importance. That or carry WAY more fuel on a passage.A vpp can get  all
> your engine can produce, power wise, at any rpm, reducing the amount of  fuel
> required to make your passage, and gives you the ability to increase  your
> ballast, which increases your chances of actually making the passage.
>
>
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