FYI, I have a 5-blade prop running on a single Cummins B6. A couple of
years ago, I had occasion to help take a twin sister ship from Solomons
to Stuart equipped with the NT standard 4 -blade. My subjective
observations: The 5-blade has more initial torque (walks more), is
significantly quieter, loses a knot or so in upper range speed.
Starting from scratch, I'm not sure which I would choose but lean
slightly toward the 4-blade.
Paul Turner Potomac, MD
NT37-35 "Manitou III"
On Jan 4, 2005, at 10:30 AM, John Pounder wrote:
Hi all,
I'm still debating what to do about my prop problem, excessive noise
in the aft stateroom, sounds like water slapping the hull. I'm
currently running 1800 RPM through a 3.83:1 gearbox to a 40x30 four
blade prop. At this shaft speed, all of the prop shops that I've
talked to do not believe the noise is cavitation.
Several shops have recommeded a five blade prop, my question is does
anyone on the list run five blades? and what are your observations as
far as noise and performance?
Thanks,
John Pounder
"OuttaHere"
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FYI, I have a 5-blade prop running on a single Cummins B6. A couple of
years ago, I had occasion to help take a twin sister ship from Solomons
to Stuart equipped with the NT standard 4 -blade. My subjective
observations: The 5-blade has more initial torque (walks more), is
significantly quieter, loses a knot or so in upper range speed.
Starting from scratch, I'm not sure which I would choose but lean
slightly toward the 4-blade.
Paul Turner Potomac, MD
NT37-35 "Manitou III"
On Jan 4, 2005, at 10:30 AM, John Pounder wrote:
> Hi all,
>
> I'm still debating what to do about my prop problem, excessive noise
> in the aft stateroom, sounds like water slapping the hull. I'm
> currently running 1800 RPM through a 3.83:1 gearbox to a 40x30 four
> blade prop. At this shaft speed, all of the prop shops that I've
> talked to do not believe the noise is cavitation.
>
> Several shops have recommeded a five blade prop, my question is does
> anyone on the list run five blades? and what are your observations as
> far as noise and performance?
>
> Thanks,
>
> John Pounder
> "OuttaHere"
>
>
> ---------------------------------
> Do you Yahoo!?
> Take Yahoo! Mail with you! Get it on your mobile phone.
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> http://lists.samurai.com/mailman/listinfo/trawlers-and-trawlering
>
> To unsubscribe send email to
> trawlers-and-trawlering-request@lists.samurai.com with the word
> UNSUBSCRIBE and nothing else in the subject or body of the message.
>
> Trawlers and Trawlering, T and T, Trawlers & Trawlering, and T&T are
> trademarks of Water World International. Unauthorized use is
> prohibited.
>
