David Gerr's book: Boat Mechanical Systems Handbook is excellent, and contains a lot of discussion about designing rudders of various types. Highly recommended.
- Bart
Minimum/Optimal Rudder sizing
- barts
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Re: Minimum/Optimal Rudder sizing
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Bart Smaalders http://smaalders.net/barts Lopez Island, WA
Bart Smaalders http://smaalders.net/barts Lopez Island, WA
- cyberbadger
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Re: Minimum/Optimal Rudder sizing
Well Locktite Tite Foam maybe an ok product, but I cannot recommend it for a rudder like this and am disappointed in it. Great stuff would work, those familiar with bondo should go with that.
Left 24 hours the enclosed end was still a mess of unset chemical stickiness:
I made due. I just capped the ends with QuikSteel. - Sort of like JB weld, can set underwater and can be put to good use in a marine environment.
Here you can clearly see the warp or twist I introduced. At this stage there is white primer on the rudder. The picture is looking at what would be the stern of Nyitra with the rudder at "center".
i don't think it will be very noticeable unless you look at it right at this angle. I wouldn't be surprised if it generates a small artifact into the wake or slipstream behind the boat.
-CB
Left 24 hours the enclosed end was still a mess of unset chemical stickiness:
I made due. I just capped the ends with QuikSteel. - Sort of like JB weld, can set underwater and can be put to good use in a marine environment.
Here you can clearly see the warp or twist I introduced. At this stage there is white primer on the rudder. The picture is looking at what would be the stern of Nyitra with the rudder at "center".
i don't think it will be very noticeable unless you look at it right at this angle. I wouldn't be surprised if it generates a small artifact into the wake or slipstream behind the boat.
-CB
Last edited by cyberbadger on Mon Sep 12, 2016 6:12 am, edited 1 time in total.
- cyberbadger
- Full Steam Ahead
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Re: Minimum/Optimal Rudder sizing
Oh - and how close can it be to the stern of the prop?
Is 2" ok? 4"?
-CB
Is 2" ok? 4"?
-CB
- barts
- Full Steam Ahead
- Posts: 1070
- Joined: Wed Nov 18, 2009 6:08 am
- Boat Name: Otter, Rainbow
- Location: Lopez Island, WA and sometimes Menlo Park, CA
- Contact:
Re: Minimum/Optimal Rudder sizing
So long as it doesn't contact the prop you're ok; an inch or two should work fine. Sailboat rudders often surround the prop. Remember to make it possible to remove the rudder w/o too many difficulties. On our small boats, you can often drop the front of the trailer enough to get clearance to pull the rudder + shaft.
- Bart
- Bart
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Bart Smaalders http://smaalders.net/barts Lopez Island, WA
Bart Smaalders http://smaalders.net/barts Lopez Island, WA