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Thread: Prop Size

  1. #1
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    Jul 2014
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    Prop Size

    I purchased a 1988 39' Holiday Mansion Coastal Barracuda a couple of years ago and am unsure if I have the best pitched props for it. It has twin crusader 350 engines with inboards. Love the boat.

    Most of the Holiday Mansions that I come across have I/O so I haven't been able to reference properly what the propeller size should be.

    When I purchased it, the boat had major propeller damage and from what I could tell had 18x18 3 blade propellers on it. Does anyone know where I can reference what the proper size propeller for this?

  2. #2
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    Sep 2012
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    My 1986 Coastal Barracuda has 18" diameter by 16" pitch, 3 blade props. Dual Crusader 270hp 350ci engines with 1:1 Vee Drives. I am thinking about knocking 1/4" of pitch off of the props because I have plenty of WOT, around 4,700 rpms to be exact. If I knock 1/4" - 1/2" off the pitch I might be able to get more top end without over revving the engines. I'd like to keep my WOT around 4,250.

  3. #3
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    Hey stp - I'm no expert, but isn't that backwards? If you want to knock down your WOT, you would want to increase pitch. I looked it up - found this:
    "If you're changing pitch on a recreational boat, remember that each inch of pitch is worth about 200 rpm. Lowering the pitch will increase rpm and vice versa. For example, going from a 23 pitch to a 21 pitch will increase engine rpm by about 400 revolutions."

    BTW, I have a 1986 37' aft cabin with twin Merc 230's (305) and V-drives. 18x16 3 blade props. Not sure about the trani ratio, but guessing it would be a slightly higher ratio due to the lesser HP since we have the same props.

  4. #4
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    Yes, that was a typo. Just curious, what's your WOT? I'd imagine you're right about your tranny ratio. Your boat should also be a bit heavier than mine with the aft cabin.
    Last edited by stp012; 10-29-2014 at 05:40 AM.

  5. #5
    Junior Member
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    Minneapolis
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    WOT is supposed to be 4400. I can only hit that if the boat actually gets on plane, otherwise the drag is too high - so the max I get is about 4100. Yes the boat is very back heavy. We also have a genny back there. My hunch is that HM never intended this hull to carry the aft cabin, twin engines, and a generator in the back. I'm thinking about adding a 2-3' hull extension under the swim platform to compensate. That should make planing easier and the boat should sit in the water more level.

  6. #6
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    Sep 2012
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    That would be an ambitious project. There's one on Boattrader that was converted to outboards with jack plates. Not really a good solution for you since you'd lose the swim platform, but it's a neat modification nonetheless:

    http://www.boattrader.com/listing/19...boat-102299537

    There's another HM that was listed recently with an Awlgrip paint job. I can't imagine what something like this would cost!

    http://www.boattrader.com/listing/19...rracuda-633601

  7. #7
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    Looks like we're scoping out the same stuff. I have that triple outboard link saved as well. The mechanicals and electrical on that boat are fantastic - but totally insane! There's a thread about it here:
    http://www.thehulltruth.com/boating-...at-update.html

    Nice windlass - and of course that's where it wants to go. But it kills the front deck area. If I do it, I'll probably put it off to the port side as inconspicuously as possible. I have a LOA problem in our marina and can't add another foot to the length. I can get away with it under the swim platform because that's already part of the LOA.

  8. #8
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    Here's the craziest HM mod I've seen to date: http://www.powerboatlistings.com/view/13154

  9. #9
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    Sep 2012
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    Interesting idea to put the windlass off to the side. I'm probably going to put mine dead center. I have the sea package so I'll probably mount the windlass right to the deck and run an anchor roller through the sea package. Biggest issue I anticipate is not being able to see the anchor or the roller. I'm going to investigate mounting a camera at the bow and a glare free screen on the bridge so I can see the anchor. Finding a screen that you can read in direct sunlight may be a challenge.

  10. #10
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    Oct 2014
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    Minneapolis
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    Roger that.

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