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  #1   IP: 66.190.37.153
Old 05-30-2011, 05:48 PM
Laker Laker is offline
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Why the reduction?

What is the purpose of the 3ish to 1 gear reduction in the A4 reverse gear? There must be a good reason ; to my simple reasoning it seems that when going into reverse - especially in a docking maneuver - one would want all the rpm you could get ...?
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  #2   IP: 24.136.67.99
Old 05-31-2011, 09:23 AM
Dave Neptune Dave Neptune is offline
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Thumbs up Reduction

Laker, the 1.3:1 reduction in reverse does two things for you. First you will have a smooter control of blade speed because of the reduction and you can achieve many more rpm's and power for a short period of time. Keep in mind that the prop is very ineficient in reverse as well so the additional rpm range makes it easier to control.

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  #3   IP: 24.196.125.82
Old 06-10-2011, 07:30 AM
Laker Laker is offline
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Are you saying that it takes more torque ("very ineficient in reverse") to turn the prop in reverse ?
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  #4   IP: 173.166.26.241
Old 06-10-2011, 08:02 AM
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hanleyclifford hanleyclifford is offline
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It isn't so much that it takes more torque to turn the prop as that it takes more torque to move the boat in a direction it doesn't really want to go. This is especially true of full keel configurations. Besides, the reverse is achieved thru a planetary gear which lends itself to reduction.
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