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Wayne.B

Wayne.B is offline

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First recorded activity by BoatBanter: Jul 2006

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Got my prop wrench (boating post)

On Mon, 16 Feb 2009 20:23:53 -0500, wrote:

Variable pitch in a propeller does not mean adjustable. It means the
pitch varies from the hub outward. Fixed pitch means the pitch is the
same at the hub as at the outside end of the blade.

Nope. Try again.

First look up the definition of pitch and then you can post your apology.

Why would I apologoze? You are WRONG, ****forbrains.

Look it up, asshole.

I looked it up. You are still wrong, ****forbrains. And your mother
does squat thrusts on fire hydrants. You can look that up, too.

What an enlightened discourse.

In the interest of ending this exchange I have gone to the trouble of
checking one of the definitive sources on all things propeller, Dave
Gerr's "Propeller Handbook".

Sorry Dan, the dog wins.

Page 23, 3rd paragraph: "The majority of propellers have blades with
essentially constant pitch, but a few specialized propellers have
blades with pitch that changes substantially from root to tip. This
means that the blade angles do not vary in such a way as to keep pitch
constant. The principal reason for these *variable-pitch propelers*
is to take advantage of varying speeds of water flow to the propeller
- as measured radially out from the hub - due to the interference of
the hull ahead."

Gerr then goes on to talk about *Controllable-Pitch Propellers* where
the pitch can be changed while underway with a mechanical or hydraulic
mechanism.

http://www.amazon.com/gp/product/B000OG7VH0

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