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Cupped Prop

Discussion in 'Carver Yacht' started by Aimhii, Dec 30, 2014.

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  1. Aimhii, Dec 30, 2014
    #1
    Aimhii

    Aimhii Member

    Joined:
    Sep 22, 2013
    Messages:
    46
    Location:
    Port Severn
    I used to have a Bayliner 3288 - Was a Semi displacement hull. We cupped the props and found an increase in efficiency as well as better cruising when not trawling at low speed.

    We now have a Carver 404 - Planing hull. So as much as we don't want to suck gas at 3200-3400rpm…A planing hull gives us no choice when we have to get there at 20-22mph. However I am considering cupping our 21 X22 props Like we done on the Bayliner.

    Has anyone here cupped their props on a Planing type Cruiser such as our Carver? I would be interested to hear what type of results you found?

    I am expecting to lose 100-200 rpm - however we may have to reduce the pitch by 1" to minimize the added load? I am aiming for better fuel efficiency and slight increase in speed…..But without added load on the engine?

    Thanks in Advance….