Advice on 20ft beachcat design and build

Discussion in 'Multihulls' started by Philippe Lapere, Apr 29, 2021.

  1. Philippe Lapere
    Joined: Aug 2018
    Posts: 16
    Likes: 7, Points: 3
    Location: South Africa

    Philippe Lapere Junior Member

    Update pics:
    upload_2021-10-5_15-13-34.png

    upload_2021-10-5_15-14-19.png

    Question: when I laminate the 1 layer of 160 gsm fibreglass onto the PVC sheets (pic below), I get a resin:fibreglass ratio of between 2:1, and 2.3:1, no matter how frugally I use the resin - there are even some underwetted areas on the sheet - should I be using more resin, or is there something else I should do? thanks
    upload_2021-10-5_15-25-9.png
     
  2. redreuben
    Joined: Jan 2009
    Posts: 1,840
    Likes: 152, Points: 63, Legacy Rep: 349
    Location: South Lake Western Australia

    redreuben redreuben

    You should not have underwetted areas that is no good, I’m assuming your worrying about going above 1:1 ?
    Don’t be, lots of resin is used wetting out the foam pores.
    Hand laying will never get close to infusion type ratios, keeping it lean is desirable but dry at the cost of resin use is false economy.
     
  3. trip the light fandango
    Joined: Apr 2018
    Posts: 471
    Likes: 94, Points: 28
    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    If you use a mixture of microballoons and work it into the surface of the PVC first, you can cut down on the absorption rate of the resin .
     
  4. upchurchmr
    Joined: Feb 2011
    Posts: 3,249
    Likes: 234, Points: 63, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    Works, but don't make the microballons too thick.
     
  5. Philippe Lapere
    Joined: Aug 2018
    Posts: 16
    Likes: 7, Points: 3
    Location: South Africa

    Philippe Lapere Junior Member

    Ok thanks, I'll ignore the ratio and wet out correctly - I'll get myself a vaccuum machine in future, for the actual 20ft cat where the strength will be more critical
     
  6. Philippe Lapere
    Joined: Aug 2018
    Posts: 16
    Likes: 7, Points: 3
    Location: South Africa

    Philippe Lapere Junior Member

    Interestingly (to me at least lol), I recently discovered that a Solcat 18's rudder crossbar is ahead of the mainsheet, so there's no need to swing the extension around the back each time you tack or gybe (which I don't enjoy doing on my hobie 16) - do you reckon it'll be a handful to swing around the front, maybe requiring a telescopic extension to get the required length when trapezing? That might negate some of the convenience then
    upload_2021-10-26_16-28-51.png

     

  7. upchurchmr
    Joined: Feb 2011
    Posts: 3,249
    Likes: 234, Points: 63, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    On my Tornado, I always wanted 2 tillers, one for each side so I didn't have to swing the tiller.
    Never did it for lack of funds.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.