<20' Offshore Speedboat - Already exist, or plans?

Discussion in 'Powerboats' started by Crawford, Jun 6, 2006.

  1. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    Hi folks,

    I recently serisously considered the purchase of a 1966 Glastron Jetflite 144 with 100HP period Mercury outboard. It needed some work, but my real reason for walking away was that i was unsure of its useability for my interests.

    An american Glastron forum suggested that these speedboats were only really suitable for inshore lakes, which must be close to flat. If there were many such lakes in the south of the UK i would be happy with this, but their scarcity leads me instead to think i will be using it mainly along the bristol channel. Thus, the Glastron would be unsuitable for this.

    I've searched to find speedboats suitable for UK (almost) offshore waters, but only really come across the Fairey brand. These seem kinda big.

    Other designs i've looked at include those of Donzi and Formula, but whilst these may be seaworthy i find them unattractive and expensive in both initial and running costs.

    Aesthetically, i like the Chris Craft designs and things of this ilk - however, these seem also unsuitable for offshore use.

    Key Question:

    Do boats (or plans) exist for classicly styled (30s-70s eras) offshore power/speed boats that are traillerable (<20') and reasonably seaworthy?

    I am seriously considering making something wooden myself - should be reasonably feasable as my family are cabinet makers.......

    Any suggestions welcome!

    Cheers

    Crawf

    P.S - Sorry for the rambling background!
     
  2. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    I know i ramble a little in my post, but surely someone has some suggestions!?
     
  3. antonfourie
    Joined: Oct 2005
    Posts: 170
    Likes: 2, Points: 0, Legacy Rep: 13
    Location: London

    antonfourie Senior Member

    Crawford, the problem with speedboats is that they tend to have too little V to be able to handle any size wave without slamming, if you are looking to build yourself then perhaps look at a sportfisher hull with your own deck design.
     
  4. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    Certainly true of the Glastron and Chris-Craft lake boats, but Forumula, Riva and Donzi have fairly deep V don't they?

    How deep a V is nessecery for "safety" in >8' waves?
     
  5. mmd
    Joined: Mar 2002
    Posts: 378
    Likes: 16, Points: 0, Legacy Rep: 309
    Location: Bridgewater NS Canada

    mmd Senior Member

    What do you want to use the boat for? This will affect the type of hull to have rather considerably. Do you want to just go joyriding when the weather is pleasant, or do you want to do a bit of fishing? Will it be used as a commuter of sorts to take family and gear to a holiday spot on a nearby island? How much speed do you want? Do you want to go leaping from wave crest to wave crest like the racers do, or merely maintain a comfortably fast pace adjusted to the current conditions?

    With a better understanding of the conditions of use, us designer types can better suggest what type of boat is best for your situation. I suspect that, for most features at least price, a home-built boat may be in your future, but be prepared for that to be relatively expensive too.
     
  6. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    Hi,

    The boat would be used for joy-riding in pleasent conditions, but would ideally also be useable (in an enjoyable rather than just survivable way!) in lesser conditions.

    It might be used to commute down the coast of Wales, and i would think a cruising speed of ~30knots would be fine. Picking up speed to 40-50knots would be great if available for short blasts. I appreciate that 50 would require substantially more power, so perhaps the lower estimate is more realistic.

    It would not be used for fishing, but sufficient stability to swim from would be highly desirable.

    Hopefully the costs would not be too high - we have a fair selection of automotive engines in the family, and probably sufficient timber lying around not to have to buy further.

    Cheers
     
  7. antonfourie
    Joined: Oct 2005
    Posts: 170
    Likes: 2, Points: 0, Legacy Rep: 13
    Location: London

    antonfourie Senior Member

    Crawford, every hull shape is a compromise, as MMD ask what would your intended use for this be ? Are you going to use it on nice days with the ability to handle a bit of chop when the weather turns, or is this a serious work boat that needs to be able to cope in a gale.

    A basic assumption is that you will use it for nice days and be able to cope with some North Sea chop, in that case a V of between 18 - 20 degrees should do the job.
     
  8. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    I am somewhat limited in my ability to answer as i don't know what sort of conditions are typical of the english channel, southern part of the north sea or the Bristol channel.

    The boat should be useable in whatever is typical here, at its best in good conditions for these regions, are safe to some extent beyond typical. However, this is a pleasure craft, not for work giving flexibility as to its launch conditions.

    I was suprised to read that the Riva Aquarama (or however that is spelt) is suitable for conditions of <8' swell. Is this the case? I did not think these were of particularly deep V design.

    Cheers

    Crawford
     
  9. stonebreaker
    Joined: May 2006
    Posts: 438
    Likes: 11, Points: 0, Legacy Rep: 42
    Location: Shiloh, IL

    stonebreaker Senior Member

    http://www.rbbi.com/links/pbl.htm#power

    This is a list of North American powerboat builders. I realize you're in the UK, but maybe this list could give you some ideas? Check out the Hydra-Sports fishing boats - they're made for offshore fishing, which I know you said you don't do, but the smallest one is 18 feet and they have a very nice deep vee hull. Maybe you could have one refitted to suit?
     
  10. Crawford
    Joined: Aug 2004
    Posts: 8
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bristol, UK

    Crawford Junior Member

    I'm rather interested in building my own, in either marine ply or hardwood. This seems the best way to get the classic look im interested in.

    These all look very impressive, but not really my taste!

    Cheers though!
     
  11. stonebreaker
    Joined: May 2006
    Posts: 438
    Likes: 11, Points: 0, Legacy Rep: 42
    Location: Shiloh, IL

    stonebreaker Senior Member

    I understand about having the bug to build your own - I have it myself.
     
  12. sportcruiser
    Joined: Jun 2006
    Posts: 157
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Netherlands

    sportcruiser VanderWood

    Hi Crawford,

    You may want to check my design at www.bootbouw.blog2blog.nl. I also intend to use my boat for short holiday trips, a bit of cruising and even skiing. It inclused a bow sleeping cabin, sun deck, etc on a retro 50-60ies look. My design is 30ft, a bit larger than you intend. Sizing it down is an option but that would mean elimating the bow cabin and sun deck. It has a 22deg deep V.

    Greetz,

    Klaas van der Woude
     
  13. rustnrot
    Joined: Aug 2002
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Augusta, GA

    rustnrot Junior Member


  14. Adam Younger
    Joined: May 2006
    Posts: 40
    Likes: 1, Points: 0, Legacy Rep: 30
    Location: UK

    Adam Younger www.adamyoungerdesign.com

    We could certainly supply suitable lines / build details for what you are looking for. Most of our work is for high speed planing and I believe our offshore race hulls and their handling are excellent for UK conditions.

    more info at our website

    Adam
     
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.