Re: [AtkinBoats] Re: Propeller shaft layout
- Thank you.
From: vagabandero <pbehnken@...>
Sent: Wednesday, October 24, 2012 6:59 PM
Subject: [AtkinBoats] Re: Propeller shaft layout
Good point, I'm thinking of building a Sergeant Faunce which shows the same type of prop layout. I think the issue is vibration due to shaft flex, which should be the same regardless of whether there's a strut or bearing in the keel. Obviously, power is also a factor. I'd be interested in other input. I wouldn't think that extending the keel would hurt, but water flow to the prop is always a consideration. Keels extending close to the prop are usually scalloped to allow better water flow.
--- In AtkinBoats@yahoogroups.com, "philpadovano@..." <philpadovano@...> wrote:
> Hello all. I am building the Wake Robin and I have a question about the layout of the propeller shaft. The plan shows the shaft extending about 10 inches from the aft edge of the stern bearing housing. The drawing on of the Wake Robin on the Atkins website does not show the scale but you will see what I mean if you look at it. I read in Glen Witt's book that the propeller shaft should not extend from the stern bearing more than a distance equivalent to the diameter of the shaft (In my case 1 inch). He was referring to a bearing in a strut, so I'm not sure whether the same rule applies to a stern bearing attached to the aft end of a fixed keel. I took a quick look at other inboard boats on the Atkins website and they all seem to have the propeller very close. Compare, for example, the Scamp, which has an almost identical hull design. The propeller appears to be about an inch from the stern bearing. I am thinking of extending the keel aft so that the propeller will not extend so far beyond the bearing. Any thoughts? Thank you very much. Phil.