According to the Cummins guys and the prop shop who did the calculation it should top at 20/21kts and cruise at 17/18kts
This is why I ve been careful with weight since deciding to get bigger engine I ve removed a lot of weight from the boat. I m going to replace the ER floors with foam core glass as well as the ER hatches that weight a ton. Well, not a real ton... one concern is the drag from the new stabs which are twice as big as the Vospers I m pulling up out. Working on the trim tabs too. Bennett suggested adding tips to the existing tabs to better channel the water. They re about 2" deep and installed on the bottom edges of the tabs,
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Thread: 53 MY Repower, started!
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Re: 53 MY Repower, started!
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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12-01-2017 05:38 PM #42Senior Member
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Re: 53 MY Repower, started!
Thanks. It s not much deeper than the one I have now. I want to go to a full 36" deep
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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12-04-2017 12:40 PM #46
Re: 53 MY Repower, started!
17/18 kts cruise is a very practical speed for these boats. Are keeping the same size of shafts and reduction ratio (2:1) on the transmission ?
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Re: 53 MY Repower, started!
Yes same shaft size and same ratio. Putting in new shafts and new props though
We pulled the old trim tabs and I m having the recess filled so we can install new 54x12 tabs which should help provide lift. I know that most of the time we ll run at hull speed but I want and hope to balance the boat to easily hop on plane if needed
The old Vosper mini fins put out a fight but they re out. I m hoping that they ll have everything clean and painted by the end of this week so the first engine can go in. They re also working on the steering system, exhaust etc.
Got a $4600 quote for a new 36" platform which isn't too bad I guess. Divinicel cored to keep aft weight down with ply inserts where it bolts to supports to avoid crushing the core
Heading out to the Exumas for a charter so we ll be gone for a couple of weeks but will try to get pictures of the progress thru a friendPascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: 53 MY Repower, started!
Try Swim Platforms. Inc. in Phoenix Az. They made my 48 inch deep swim platform and included new Stainless Steel struts and all bolts, even gelcoated it to match my paint, shipping was pretty steep, like $400.00 but the unit was $4400.00 included a pull out swimm ladder. John
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.
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Re: 53 MY Repower, started!
Rusty, not yet but I saw a 61 here with a sideways stair way that I really liked. It is on the list to do someday, I think 2018 is already full with projects. What I did change is the angle of the ladder is more do to the new swim platform being higher so the bottom of the ladder is out further which does make it a little easier to use. John
Mahalo V
1974 53 Motoryacht
Hull Number 406
San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.