I saw these chine extensions on Bertram at the yard today, do they really provide extra lift?
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I saw these chine extensions on Bertram at the yard today, do they really provide extra lift?
Here's some on a 41c I saw in a yard. Can't comment on if they work or not.
https://lh3.googleusercontent.com/zo...=w1031-h773-no
https://lh3.googleusercontent.com/V5...=w1031-h773-no
I was told from Sam's think it was Steve I was talking to and he said some times yes and sometimes No.
I did the smart rails which is that first picture and it did nothing for lift or speed. After I repower I cut them off I found in a beam sea they would grab and make the boat a little squirrelly.
I did a bottom job, lift rails, added block to tabs to push bow down and lighten the boat some it was still Slow change the horse power to 33% more and that worked :D
I’ve seen those done on Bayliner‘s. It helps with the rolling motion more than lift.
Some years ago trawlers with soft chines were getting these to reduce roll at anchor.
Bobk
One of my friends installed them on his 1968 38C and he said that the only benefit he had was less
spray.
Walt
As stated, they are usually used for stability at rest. A hard chined boat is inherently more stable but less fuel efficient. The Bayliner motoryachts (4588, 4788) use foam filled chine extensions to convert them to hard chine and also add buoyancy to the stern as they are underpowered and need help getting the bow down.
Bennett now makes cylinders with 3 1/2" travel rams. Standard has always been 2 1/2". You need to retrofit by making your own starboard adapter. Can't wait to install them over the winter.