Variable pitch propellers
- marcelo_malara
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Variable pitch propellers
Does anyone know when variable pitch propellers began to be used in warships, and which one was the first?
Regards
Regards
- marcelo_malara
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- frontkampfer
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Re: Variable pitch propellers
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!"
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Re: Variable pitch propellers
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.
- Herr Nilsson
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Re: Variable pitch propellers
AFAIK Leipzig had a variable pitch propeller on its center shaft.
Regards
Marc
"Thank God we blow up and sink more easily." (unknown officer from HMS Norfolk)
Marc
"Thank God we blow up and sink more easily." (unknown officer from HMS Norfolk)
Re: Variable pitch propellers
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.
"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.
- Herr Nilsson
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Re: Variable pitch propellers
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.
In case of Leipzig the blades of the center propeller could be adjusted in service.
Regards
Marc
"Thank God we blow up and sink more easily." (unknown officer from HMS Norfolk)
Marc
"Thank God we blow up and sink more easily." (unknown officer from HMS Norfolk)
Re: Variable pitch propellers
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.
The propeller was unrecoverable, and the Barbey was towed into San Diego after nearly a day adrift.
TMischke (aboard 1977-1980)
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.
The propeller was unrecoverable, and the Barbey was towed into San Diego after nearly a day adrift.
TMischke (aboard 1977-1980)
Re: Variable pitch propellers
Pretty sure the Germans used variable pitch propellers on their Uboats or at least planned to do so.
"Eine mal is kein mal"