by Guest » December 5, 2016, 12:08 am
Greenshirt wrote:mn brett wrote:So does the Engine also turn the same direction as the Prop?,or does the gear box change the direction ? Thank You!, mn brett
The gear box changes the direction of the opposite shaft
The reduction gear has no ability to "change direction" other than being a torque amplifying device.
On this vessel the port engine has a counterclockwise rotation with respect to the flywheel of the engine, while the starboard engine has an opposite clockwise rotation at the flywheel. The relative high speed revolutions per minute (about ~460 RPM's on the Speer at engine rated speed) are reduced to a lower, higher torque shaft output via the reduction gear at about 90 RPM's when at rated speed.
Camshaft timing and position are how opposing rotation are accomplished, the reduction gear simply takes the engine revolutions and amplifies the torque while reducing the speed to give you output shaft rotation.
So to answer your question after some long-windedness, yes the engine turns the same direction as the propeller, just at a higher speed.
[quote="Greenshirt"][quote="mn brett"]So does the Engine also turn the same direction as the Prop?,or does the gear box change the direction ? Thank You!, mn brett[/quote]
The gear box changes the direction of the opposite shaft[/quote]
The reduction gear has no ability to "change direction" other than being a torque amplifying device.
On this vessel the port engine has a counterclockwise rotation with respect to the flywheel of the engine, while the starboard engine has an opposite clockwise rotation at the flywheel. The relative high speed revolutions per minute (about ~460 RPM's on the Speer at engine rated speed) are reduced to a lower, higher torque shaft output via the reduction gear at about 90 RPM's when at rated speed.
Camshaft timing and position are how opposing rotation are accomplished, the reduction gear simply takes the engine revolutions and amplifies the torque while reducing the speed to give you output shaft rotation.
So to answer your question after some long-windedness, yes the engine turns the same direction as the propeller, just at a higher speed.