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  #1  
Old 02-13-2017, 07:09 AM
Jon E Jon E is offline
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Design proposal - help needed

Design proposal - help needed

I would like to build a "high speed" (15 knot cruise) low power displacement boat who can transport me from A to B - in "safety" (it is relative, i know:-)) - in quite rough sea. I do not need liveaboard facilities, other than a comfortable slim cockpit to steer from.

Is the scetch below a possibility (or something similar), or is the idea plain stupid?

If possible at all, i am willing to discuss payment for help designing this boat.

Design proposal - help needed-boat_proposal.gif
  • Displacement
  • Self-righting
  • Strong and seaworthy
  • Confortable in rough sea
  • Design weight below 1000 kg?
  • Length: <15 meter
  • Width: 1 meter (waterline) ???
  • Material: Aluminium
  • Cruise: 15 knots?
  • Innboard or outboard?
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  #2  
Old 02-13-2017, 07:17 AM
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daiquiri daiquiri is offline
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Have you tried to check how the others have taken on the challenge?
https://www.google.it/search?newwind...k1.s-Y4HGRQlK4
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  #3  
Old 02-13-2017, 07:20 AM
Jon E Jon E is offline
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Quote:
Originally Posted by daiquiri View Post
Have you tried to check how the others have taken on the challenge?
https://www.google.it/search?newwind...k1.s-Y4HGRQlK4
Yes, but that type of boats are very expensive. I would like a "low" cost build with a low power engine.
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  #4  
Old 02-13-2017, 07:42 AM
HJS HJS is offline
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Semi-planing boat

It is, in my initial calculations entirely possible to design such a boat. The dimensions you specify indicates that the boat is not a displacement hull. It is a semi-planing boat and must be designed as such. That means it should have a customized transom and not be pointed. Then either the speed or length can be customized to create an optimal boat. But your sketch is a good start.
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  #5  
Old 02-13-2017, 07:49 AM
UpOnStands UpOnStands is offline
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your first post said high speed. but now its a low power engine?
high speed at low power suggests a hydrofoil surface skimmer for perfectly flat lakes, certainly not a rough open-water boat with perfect safety.
your sketch shows a submarine in rough weather, and a very unstable one at that.
Frankly, total safety at sea and low costs cannot be reconciled. Good enough safety can be achieved a reasonable cost but of course you can never exceed the design (weather) envelop and expect to remain safe. Your decision.
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  #6  
Old 02-13-2017, 08:23 AM
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Richard Woods Richard Woods is offline
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Maybe you need to rethink it. Something like this is a proven rough water boat, 15hp outboard, 15 knots. seen here mid way across the Juan de Fuca

Richard Woods of Woods Designs

www.sailingcatamarans.com
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Design proposal - help needed-brownpowercat.jpg  
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  #7  
Old 02-13-2017, 08:55 AM
Barry Barry is online now
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Looks like this would not be comfortable in a beam sea at 1 meter width and you would not be able to satisfy at least ABYC's guidelines for helm visibility?. I would expect in Norway there would be similar standards
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  #8  
Old 02-13-2017, 09:06 AM
Stumble Stumble is offline
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You would have to ask a designer, but a very long thin hull with a low power engine may hit the speeds you want, but it would be painfully uncomfortable inside. With no form stability thanks to the extremely narrow hull trying to keep it upright would be a major issue.

You would almost certainly be forced to move to a prop or Catamaran design instead of a monohull.
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  #9  
Old 02-13-2017, 12:04 PM
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fredrosse fredrosse is offline
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29 feet, (8.8 M), 15 Knots, 15 horsepower

Just for information, here is a steamboat, 29 x 5 (8.8M x 1.5M) Hull, that has demonstrated 15 Knots as a displacement hull, well streamlined compared to the typical wide beam planing hulls. While not exactly what you are looking for, I think this hull form may be close.

Have a look at 2 minutes into the video. While not a rough water boat in its present configuration, she does get up and go with only 15 horsepower. Click on the link below, and have a look.

https://www.youtube.com/watch?v=BgzSazdIy5s

Oberon cuttin some rougher water, look at 20 seconds in:

https://www.youtube.com/watch?v=6ff9BT3nltU
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  #10  
Old 02-13-2017, 12:05 PM
HJS HJS is offline
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For the proposed speed and demands for a smooth ride, I would choose a twelve-meter long stabilized monohull, a trimaran.
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  #11  
Old 02-13-2017, 12:10 PM
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Richard Woods Richard Woods is offline
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Quote:
Originally Posted by HJS View Post
For the proposed speed and demands for a smooth ride, I would choose a twelve-meter long stabilized monohull, a trimaran.
But only if you know how it will be docked. Coming alongside and boarding from a pier in a trimaran with small outriggers set low down can be challenging! Pretty much every other boat type allows a crew member to run to the bow to fend off. But then maybe other people are much more skilled sailors than me and always come alongside perfectly

RW
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Old 02-13-2017, 12:16 PM
Rurudyne Rurudyne is offline
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Look up William Gardner's Tlingit, a comparable low power craft.
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  #13  
Old 02-13-2017, 12:17 PM
Rurudyne Rurudyne is offline
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Quote:
Originally Posted by Richard Woods View Post
But only if you know how it will be docked. Coming alongside and boarding from a pier in a trimaran with small outriggers set low down can be challenging! Pretty much every other boat type allows a crew member to run to the bow to fend off. But then maybe other people are much more skilled sailors than me and always come alongside perfectly

RW
Wouldn't swing wings work well with the small amas of a stabalized monohull too?
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  #14  
Old 02-13-2017, 01:01 PM
HJS HJS is offline
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My choice a trimaran 12,0 x 2,0

js
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Design proposal - help needed-tri-12-m-jon.jpg  
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  #15  
Old 02-13-2017, 06:08 PM
UpOnStands UpOnStands is offline
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buy used to stay totally safe
http://www.seaboats.net/10.5m-fast-p...dp1355799.html
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