Nacra 5.8 donor hulls possibly too heavy for Strike 20 trimaran build?

Discussion in 'Multihulls' started by mystrwizard, Nov 16, 2016.

  1. mystrwizard
    Joined: Oct 2009
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    mystrwizard Junior Member

    Ive got a Nacra 5.8 that I can use the hulls for building a Strike 20, I know they are appropriate for the build, but Ive heard that they are a bit on the heavy side for building the Strike 20.

    Would they still be sufficient or should I look for alternative donor hulls?

    Reese
     
  2. Tom.151
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    Tom.151 Senior Member

    Although Richard Woods frequents several building forums, that's nor guaranteed.

    He's excellent about supporting his builders - just send him an email with your Q's. Better to get it from the designer himself.

    If Richard has appropriate plans for a light weight ama for the Strike 20, that would definitely be the way to go.

    You build the boat only once, you sail with the weight penalty of your decisions every time you go out.

    Cheers,
     
  3. Barry
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    Barry Senior Member

  4. patzefran
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    patzefran patzefran

    As builder and sailor of the prototype Strike 20 using Nacra 5.8 hulls I can say they are well suited to the boat. They are strong, have plenty of buoyancy forward (more than a Tornado I think) and beautiful lines. The plus is they use standard 100 x 3 mm spinaker pole tubes. The only draw back is they are a little on the heavy side. My hulls are 1989 and 1990 built and weight around 61 kg each, more recent foam sandwich ones should be lighter. I think one can built Ply hulls around 50 kg (my 20 ft Trem tortured ply outriggers weighted 50 kg each). If you need more data on the Strike20, please ask, you are welcome !
     
  5. patzefran
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    patzefran patzefran

    I forgot to say that when I look at the Pulse 600 weight around 1000 lbs I am glad with the total weight of my Strike 20 around 350 kg, including all gears and motor !
     
  6. basil
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    basil Senior Member

    Would a Nacra 5.2 be acceptable to use, or are they not long enough to do the job? There are also plenty of older "A" class cats available here in Australia. I would expect the "A" class rigs might need strengthining?
     
  7. patzefran
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    patzefran patzefran

    Richard woods designed the Strike 20 for 18' outriggers, I think it is a minimum length. As for the class A they are designed for a 75 kg boat weight and only one crew, I think they are not able to whistand 600 kg, 4.5 m beam and the related righting moment ! I would not use them.
     
  8. basil
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    basil Senior Member

    Thanks for that.
    I did have my doubts about the "A" class. It's just that here in Australia there's plenty of old plywood ones for sale. Fairly easy to sand down and lay a coat of carbon uni over one to strengthen it up.
     

  9. patzefran
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    patzefran patzefran

    For me, it is not only the A cat hull strength that matter, but also the low diplacement. You will get a much lower maximum righting moment than with F18 or a Nacra 5.8. You can live with this, but at the detriment of performance, it is your choice !
     
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