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matt_unique
Joined: 27 Feb 2007
Posts: 1881
City/Region: Boston
State or Province: MA
C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: Napoleon
Photos: Napoleon
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 Posted: Wed Mar 19, 2008 9:44 am Post subject: Re: Placement of counter-rotating engine on Tomcat? |
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| Alok wrote: | Matt- a minor point:
In my single engine trawler with a large fixed prop and no rudder effect while in reverse in low speed, prop walk was a significant and useful tool while docking.
With outboards, I have the ability to swivel the motors, so I don't need to even think about prop walk to make the stern go in to the dock. Also, with twin counter-rotating engines, if I really wanted to use the prop walk to move the stern in either direction, I could just put the appropriate motor in gear. It should not matter which motor is on which side.
What do you think? |
I agree. On the single inboards the prop walk is unreal...without touching the wheel I can move the stern perpendicular about 18". On the twin outboards (non-counter rotating) the prop walk is negligible, I too turn into the dock as I'm reversing engines to walk the stern then hard over in the opposite direction to null this movement before shifting to neutral. The twin outboard vessels I'm referring to run Merc 90's. My 150's will be running much larger props and if there was to be any prop walk at all I wanted it heading toward the dock. I learned after that the CR engine placed to starboard would also provide some stern lift. So from my research the real benefit was in the stern lift.
_________________
Captain Matt
Former owner of Napoleon (Tomcat) Hull #65 w/Counter Rotating Suzuki 150's. |
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