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nacra masts 5.7 and 5.8  Bottom

  • rungi

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    Link to this post Posted: Aug 10, 2021 - 10:11 PM
    Hello,

    How do the mast on the nacra 5.7 and 5.8 differ?

    I have a 5.8 mast on my 5.7 boat. Don't want it to fall off the ball.
    I noticed a lot of shedding of the white ball and the ball seems to spin when rotating the mast.

    I hope I can use the 5.7 sail on the 5.8 mast.
    Anyone with experience know?
  • Edchris177
    Edchris177
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    Link to this post Posted: Aug 10, 2021 - 11:01 PM
    How old is the ball?
    Old ones, left in a high UV environment degrade. Buy a new one.
    Secondly, look at the cup on the mast base.
    Is there a sharp edge, or burr, that is cutting into the mast ball?
    Don’t worry about the ball turning. Both my 5.0 & 5.7 do that. As the mast rotates left, it unscrews the ball 1/4 turn, when it rotates the other way, it turns the ball back down.
    There may be other issues, but if your rigging is tight, the mast cannot fall off the ball

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • rungi

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    Link to this post Posted: Aug 11, 2021 - 08:18 AM
    Ok Thanks, I am not sure the age of the ball I just got the boat.
    Do you know if the 5.7 sail work on a 5.8 mast?

    Does a new ball just screw on to the bolt?
  • rch701
    rch701
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    Link to this post Posted: Aug 11, 2021 - 09:06 AM
    The ball just screws on by hand. I was experiencing ball spin on my Nacra 5.2. Last week I polished the mast base. I took 120grit paper and taped it over a phillips screwdriver handle and chucked it up in a drill. I followed that with 220 grit. Now it is smooth and doesn't spin the ball.

    --
    FYC, Nacra 5.2 "Chris's Flyer" & Nacra Playcat
    Previously owned: Trac 14, H14, H16, H18, N5.0, G-cat 5.0
    --
  • shortyfox

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    Link to this post Posted: Aug 11, 2021 - 02:32 PM
    Not sure if it's a good idea to let the ball rotate. A lot of focused pressure on those threads and it certainly wasn't designed for that. Mine started doing it when the ball started to flatten out at the top after a lot of use. I got a new one and hand tightened it as much as possible and then used a channel lock pliers and gave it an extra 1/8th inch, no more!

    --
    Bill Townsend
    G-Cat 5.0
    Sarasota
    --
  • rungi

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    Link to this post Posted: Aug 11, 2021 - 06:14 PM
    no experts on these boats?
    also anyone how the 5.8 and 5.7 mast differ?
  • geepaks
    geepaks
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    Link to this post Posted: Aug 11, 2021 - 06:44 PM
    Recommend you contact BRNwatersport.com. They sell parts for all these older boats. Im sure they can give you a correct answer.
  • geepaks
    geepaks
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    Link to this post Posted: Aug 11, 2021 - 06:52 PM
    found this at below link for Nacra measurement guide
    5.8 mast length = 9156mm
    5.7/5.5 mast length = 8858mm

    https://ausna.com.au/wp-content/uploads/2019/03/2015-NACRA-Measurement-Guide.pdf
  • HULLFLYER

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    Link to this post Posted: Aug 12, 2021 - 07:29 AM
    I have a nacra 5.7 mast for sale, also a tramp and a rear crossbar.
    Located in Delray Beach Fl 33444
  • revintage
    revintage
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    Link to this post Posted: Aug 12, 2021 - 01:23 PM
    Just add a ca 30cm wire strap between head and halyard ring to compensate for the difference in length. Another more radical solution is to cut the mast top 30cm to correct length.

    --
    Brgds
    Lars

    Frankentri 5.8/5.5/Inter20
    Aerow trimaran foiler

    https://www.facebook.com/groups/1192604934176635
    --
  • rungi

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    Link to this post Posted: Aug 16, 2021 - 04:25 PM
    So it the 5.8 mast 30 cm longer than the 5.0?
  • revintage
    revintage
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    Link to this post Posted: Aug 17, 2021 - 02:50 PM
    According to the Australian paper above difference is 30cm. To make the 5.8 mast closer to the 5.7 you should cut 20cm from the base and 10cm from the top, to get the hounds at the correct height.

    --
    Brgds
    Lars

    Frankentri 5.8/5.5/Inter20
    Aerow trimaran foiler

    https://www.facebook.com/groups/1192604934176635
    --

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