Variable pitch propellers

Propulsion systems, machinery, turbines, boilers, propellers, fuel consumption, etc.
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marcelo_malara
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Variable pitch propellers

Postby marcelo_malara » Sat Jun 16, 2007 3:46 pm

Does anyone know when variable pitch propellers began to be used in warships, and which one was the first?

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Ramius
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Postby Ramius » Tue Mar 11, 2008 12:00 am

My guess is since the early 90's, since some of the Ticonderoga's have them. :think:

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marcelo_malara
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Postby marcelo_malara » Tue Mar 11, 2008 12:11 am

Wow, it seems that new people in the forum is bringing back old topics from the dead!!!! Welcome to the forum and thanks for your answer. Are you sure they hadn´t been used before?

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Ramius
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Postby Ramius » Tue Mar 11, 2008 12:16 am

Im pretty sure the earliest possible ships were the Spruances. Im sure variable pitched propellers can only be so old. :think:

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frontkampfer
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Re: Variable pitch propellers

Postby frontkampfer » Thu Jun 24, 2010 6:13 pm

They used variable pitch propellers on the FFG Perry class in th early 1980's. I know because I worked at Gibbs & Cox who did the design work. In addition, the rudder was offset from the centerline of the hull to negate the effect of the torque from the propeller.
"I will not have my ship shot out from under my ass!"

Ken Thompson
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Re: Variable pitch propellers

Postby Ken Thompson » Fri Nov 11, 2011 12:35 am

I would think that adjustable pitch propellers would be considered subseptable to shock damage so it would have taken a lot of development. The vertical Voith Schneider propellers if you consider that variable pitch were used in WW 2 on German minesweepers.

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Herr Nilsson
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Re: Variable pitch propellers

Postby Herr Nilsson » Tue Nov 15, 2011 5:42 pm

AFAIK Leipzig had a variable pitch propeller on its center shaft.
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delcyros
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Re: Variable pitch propellers

Postby delcyros » Fri Dec 16, 2011 3:46 pm

From the GOODALL report p.3 on former SMS BADEN (dated to 1921, referring to a ship completed 1917):

"Propellers and hull efficiency parameters.

(...)

The wing screws are outward turning, the center screw is left-handed. Each propeller has three detachable blades, and the pitch can be adjusted within certain limits.
"

interesting.

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Herr Nilsson
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Re: Variable pitch propellers

Postby Herr Nilsson » Fri Dec 16, 2011 4:06 pm

But that's not unusual. The pitch could be adjusted in the shipyard between different trial runs until the optimal pitch was found.

In case of Leipzig the blades of the center propeller could be adjusted in service.
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yoda57
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Re: Variable pitch propellers

Postby yoda57 » Mon Jan 13, 2014 2:05 am

The USS Barbey (FF-1088) was a test platform for the variable-pitch propeller during the mid-1970's.

The installation was not an optimum arrangement, and was catastrophic for Barbey in Southern California waters. During testing, the propeller "walked off" the shaft in over 60 fathoms depth. :shock:

The propeller was unrecoverable, and the Barbey was towed into San Diego after nearly a day adrift. :oops:

TMischke (aboard 1977-1980)

Paul L
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Re: Variable pitch propellers

Postby Paul L » Tue Mar 03, 2015 5:38 am

Pretty sure the Germans used variable pitch propellers on their Uboats or at least planned to do so.
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