67860Re: [bolger] Re: Logical leap to multihulls? (was SketchUp Chebacco)
- May 17, 2012Good post, just want to reinforce the idea... MAKE IT LONGER if you need more room.From: Harry James <welshman@...>
Sent: Wednesday, May 16, 2012 12:13 AM
Subject: Re: [bolger] Re: Logical leap to multihulls? (was SketchUp Chebacco)
Well said John
On 5/15/2012 7:58 PM, John Kohnen wrote:
> Bolger's sharpies are actually pretty narrow, and depend on high freeboard
> and buoyancy up high for secondary stability. A narrow boat, even if
> flat-bottomed, will "give" a bit in waves -- the waterline won't quickly
> conform to the face of a wave, giving a more comfortable and safer ride in
> rough weather. This is completely opposite of the behavior of a fat
> flat-bottom boat, which will roll quickly to the angle of a wave, and will
> be more likely to be rolled over by a large wave. Multihulls are in effect
> very, very fat and have huge initial stability. They don't tip over
> easily, though the ride probably gets pretty rough, until they do...
> Multihulls have proven themselves seaworthy enough for most passages, so
> the choice between them and monohulls is largely personal preference, but
> Bolger's sharpies are really pretty far from multihulls and it's by no
> means a logical progression to get to multihulls from them.
> Modern ocean racers have gotten wider, shallower and squarer in section to
> carry lots of sail and plane along at phenomenal speeds, but this isn't a
> suitable trend to follow for pleasure boats, where comfort and
> seaworthiness should be most important. Increasing the beam of one of
> Bolger's sharpies would actually make it _less_ seaworthy. If one needs
> more room in a Bolger sharpie they should build a longer one.
> On Tue, 15 May 2012 09:59:43 -0700, Stefan T wrote:
>> One of the logics our movement has pushed is toward wider beam and
>> squarer cross sections to get shallower draft for greater speed,
>> comfort, and ultimately less-sinkable safety.
>> Take Phil's sharpies and extend the beam even further to 10 or fifteen
>> feet and what do you have? The beam and draft of a multihull....
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