Chris,
It will depends on how fast you are running the motor and the dock you are tied up too, how deep it is, how close you are to the shoreline and to the bottom. I have been doing a lot of system testing by running at the dock. I am right against the shore in a small basin and the propwash actually sets up its own little current. I don't have a tackometer yet but at full throttle I can't quite load the motor as much as when in open water so I think it is safe to say the torque requirment are a little less at the dock at higher speeds but it's pretty negligable, (less than 10%). I would say at lower speeds there is even less difference in the relationship between rpms and torque. I think at the higher speeds the prop can get starved for water to push and there is not as much torque required but at lower speeds, since the boat isn't moving in response to the the trust it might actually require slightly more torque per rpm. But either way, I have observed very little difference between the trottle position and the amp draw on the motor.
Carter
From: ChristopherH <clh5_98@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Saturday, January 19, 2013 8:25 AM
Subject: [Electric Boats] Prop shaft torque
To: electricboats@yahoogroups.com
Sent: Saturday, January 19, 2013 8:25 AM
Subject: [Electric Boats] Prop shaft torque
Same prop, same RPM, will the torque required be different tied to the dock versus at speed? If so, how significant?
Regards,
Chris
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