Pocket cruisers

where is the hellipad?

 

Oh c'mon guys - this is a shining example of how the superyacht crowd are going green....

 

if you made it big enough, you could harvest algae and process it into alcohol for fuel

 

Here a clever small waterballasted sailing boat, performing several features I really like. Among them what they call Asymmetric Capsize Buoyancy (ACB) and a boarding permanent step in the trailing edge of the rudder.

http://www.swallowboats.co.uk/content/view/115/110/

From the site:

"Once fully inverted another big safety feature automatically kicks in. Her Asymmetric Capsize Buoyancy (ACB) is a real life saver. Boats that will self right from 90 degrees are usually also very stable upside down. Two or more crew have enough weight to right her from a full inversion, but ACB makes this possible even for one relatively small crew member. It works by flooding one side buoyancy tank when inverted, which destablizes the boat and in about 60 seconds, gives her a noticeable upside down heel angle. The skipper should wait on top of the up turned hull and right the boat by leaning on the centreboard, helping the boat heel to the same side as that induced by the ACB. Once righted, the water in the buoyancy tank floods out though the outboard well via the self draining cockpit floor.

........

We have talked a lot about capsizing, and righting, but getting back in can be a real problem for all but the young and fit. BayRaider has plenty of positive buoyancy so floats quite high even when swamped. Our solution has been to fit the rudder blade with a permanent step in the trailing edge, rather like a winglet at the end of an airplane wing, it sits about 12 inches below the surface and acts as a step for re boarding. The mizzen mast is within easy reach to grab hold of as is the stocky mizzen mast partners."


Cheers.

 

thats pretty dam cool G

 

Pericles brought my attention to this contest:

PBB's DESIGN CHALLENGE II

Design Parameters:
Must be trailerable for affordable launching, over the road transportation, and storage.
Max beam 8 ; max length 40 (legal trailerable dimensions in many states)
Minimum length 24 , stem to transom
Trailerable weight (with engine) should not exceed 3,500 pounds
Must burn less than 2 gallons per hour (7.6 l/hr), maintaining a 10 knot cruising speed in a 2′ (0.6m) chop and 15-knot breeze while carrying 800 lbs/362 kg (family of four). Favorable consideration will be given for continued efficient fuel consumption and good seakeeping abilities at speeds in excess of 10 knots
Must include at least Spartan overnight accommodations (berths, head, galley) for two adults and two children
Must be a new design
Submissions should be the designer’s original, previously unpublished work, and include lines, profiles, sections, table of offsets, accurate weight study, cost calculations, and performance predictions. (All designs will remain the property of their designers.)


More at: http://proboat.com/design-challenge2

Thanks, Perry.

Cheers.

 

Now that's starting to look interesting! Designing a 40' x 8' boat that can sleep 4 and weighs less than 3500lbs should result in some interesting boats....

 

Lol!!!

 

I'm just now reading thru this subject thread, having developed a new interest in powerboat hull shapes (I'll explain later).

I wanted to post this quote so that I might return to it for further comment. One thing I do seem to be understanding is there have been numerous attempts at making these single-hulled boats go faster than their 'hull speed' limitations,....isn't that known as 'planning' ??

To my knowledge most single hull boats have a theoretical hull speed that is their upper limit, until they supply enough power to climb over that bow crest and plane. A boat displaces water, there are no semi-displacement boats. Their are displacement boats that plane, or go faster than their hull speed when enough power is provided. But they are incorrectly described as semi-displacement......isn't that true?

Long slender hulls, like many multihulls use, may be the only ones that skirt pass this law of hull speed.

That's my observation at this moment in this subject thread.

I would really like to find a single-hull design shape that would be most efficient for a coastal cruiser project I'm working on, but I'm not yet convinced that these multiple new hull shapes for the single hull design make that much sense in terms of speed. Perhaps that do make sense in terms of shallow draft, prop protection, ease of motion,....I don't know yet.

 

Interesting Guillermo. and hello again
Brian

 

Well I just found myself on this subject thread
So somewhere along the line I participated

 

Nice posting Guillermo, nice summation

 

Chris White's powercat

Nice boat Tad

Reminds me of this......
http://www.boatdesign.net/forums/powerboats/weekender-picnic-powercat-33751.html

Chris White powercat & Bertram 31

This 'style' vessel reminds me of the open saloon/cockpit style of this Chris White powercat ....that further reminded me of the original Bertram 31 design

 

How about that single centered helm as on the initial Chris White cats, with that open ended cabin somewhat akin to the Bertram 31's ??

And like you said the entire cabin and deck could be made with Plascore honeycomb cored panels.

 

You need a bigger boat !!!