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Compac 23 Conversion

  • 07 Apr 2026 09:26
    Quote
    Reply # 13617735 on 13480179
    Anonymous member
    Anonymous wrote:

    Tom,
    To get an idea about how tall mast you will need, I have now sketched up a JR for that vessel. That sail is actually a down-scaled version of the sail I have on my own boat, Ingeborg.

    If that Com-Pac were mine, I guess I would look for an aluminium tube with Ø125mm (5”) and with a wall thickness of about 4mm.

    The boom has been drawn in with enough clearance for a tabernacle  -  just. However, if I were to lower the mast only twice a year, I would consider making an A-frame crane from two 6m poles.

    Have a look.
    Arne

    PS: The LAP (above deck level) is 8.26m.

    (Details in Arne's sketches, section 8, photo 33)

    Arne,

    Do you have draft ?

    The boom has been drawn in with enough clearance for a tabernacle  -  just. However, if I were to lower the mast only twice a year, I would consider making an A-frame crane from two 6m poles.

    Jacques 
  • 04 Apr 2026 17:17
    Quote
    Reply # 13617033 on 13480084
    Anonymous member

    Hello Tom - A quick question: do you have a foiled rudder on your CP-23, or the original flat plate? I ask because having the foiled version (aftermark or later model from Hutchins) makes a *huge* difference in how the CP-23 sails and handles in general.

    Back in the early 00's I made my own foiled rudder prototype to check it out, and that turned into what developed into the aftermarket rudder from Joel at IdaSailor, which is pretty much what Hutchins adopted. Joel used my design work to fab it up, and I did the on-water testing.

    Are you a member at the CPYOA website? Good info & people there; I admin/host it.

    Fair winds!
  • 29 Mar 2025 04:49
    Quote
    Reply # 13480496 on 13480084
    Anonymous member

    Thank you, Arne! That helps tremendously. 
  • 28 Mar 2025 13:50
    Quote
    Reply # 13480179 on 13480084
    Anonymous member (Administrator)

    Tom,
    To get an idea about how tall mast you will need, I have now sketched up a JR for that vessel. That sail is actually a down-scaled version of the sail I have on my own boat, Ingeborg.

    If that Com-Pac were mine, I guess I would look for an aluminium tube with Ø125mm (5”) and with a wall thickness of about 4mm.

    The boom has been drawn in with enough clearance for a tabernacle  -  just. However, if I were to lower the mast only twice a year, I would consider making an A-frame crane from two 6m poles.

    Have a look.
    Arne

    PS: The LAP (above deck level) is 8.26m.

    (Details in Arne's sketches, section 8, photo 33)

    Last modified: 28 Mar 2025 17:18 | Anonymous member (Administrator)
  • 28 Mar 2025 06:50
    Quote
    Message # 13480084
    Anonymous member

    The idea of converting my compac 23 mk3 to JR has been on the top of my mind lately. This website has provided invaluable insight. Thank you to everyone who contributes. Here's my questions:

    How far forward should I move my mast for a modern hasler/McLeod rig setup?

    How tall should the mast be above the partners?

    I'd like to follow the 3% rule for mast weight, which would be 90lbs for my boat's displacement of 3000lbs. Is this feasible for a aluminum mast? Hybrid mast? Or hollow sitka spruce mast? 

    For an aluminum mast, what thickness and diameter would I need?

    Would it be feasible to step/unstep the mast by hand or would a tabernacle be needed to avoid needing a crane to accommodate trailering twice per year.


    Thanks,

    Tom 


    Last modified: 28 Mar 2025 07:28 | Anonymous member
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