The New Scows

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Racing scows are always sailed at an angle of heel upwind which reduces wetted surface a lot and also makes waves less of a problem.

 

Large shoal-draft sailing scows - mostly schooner-rigged - were extensively used on the Great Lakes during the nineteenth century and were adequate sailing vessels. They had flat bottoms and hard bilges, often multi-chined. Clipper style schooners were also common but I believe the scows outnumbered them.

The better sailing scows had quite sophisticated construction and were preferred for their greater cargo capacity and the fact that their shape made for easier stowing - as you point out - rather than cheapness of construction, although the clipper schooners presumably made better blue-water vessels.

Canal scows or “canallers” were also very common, but less seaworthy - their design being constricted by the limitations of the canals.

 

The R/P 90 is designed for a very limited purpose. It is intended to win the Barn Door Trophy in the Transpac. It would be doing virtually all of its racing downswell.

That race has little if any true beating. The emphasis is on reaching for the first few days, and running for the end of the race.

Of course a boat like this pulls the apparent wind forward, so it is often close reaching even with true wind abaft the beam.

 

Hi, AK.

I was referring to a scaled up version of the boat I built. NOT the one in the picture.

 

Super Scow

From the Incredible Scow thread here, the SA front page in 2010 and Tison:

The SCOW 1420 pictured above is a monohull of 14.20m (rule maximum) having a flat bottomed hull inspired by the A scows. The aim is to maximize power for a given efficiency. Scow hull shapes generate up to 30% more power than a standard hull shape for a given beam and displacement. The long overhang forward reduces bow down trim and increases waterline length when beating upwind or reaching.

There is thus no need for aft water ballasts or to increase bow volume. The canting keel can be used to heel the boat to leeward when the boat is under powered in order to reduce wetted surface area. This project was introduced during the 2008 Bol d'Or and both sailors and organizers showed a strong interest. Since then, the boat has been fully developed, a boat builder has been selected and the cost has been reduced. The sailing conditions on lake Geneva tend to create highly powered sailing yachts. The recent LX-TCFX ranking allows all extreme monohulls to race against each other in real time. It is therefore a great place for naval architects to experiment. Recently, there has been a few lightweight multihulls and foilers on lake Geneva. Foilers have still not proven to be the best solution for the conditions of Lake Geneva due to the lack of wind. The LX-TCFX ranking is generally won by one of the Psaros 40 (2nd in 2009, 1st in 2008). VPP studies show that the Scow 1420 is 10 to 15% faster than the Psaros 40.. The next Bol d'Or will start on the 10th of June. - Thomas Tison.

Conceived of and Designed by Thomas Tison


click on image:

 

Interesting development is this boat being built? Or was it just tipping a toe into the water?

 

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A recent Seahorse magazine build log said this thing would be launched in 2012....

a sample digital edition: http://edition.pagesuite-profession...71971b-def3-4f1f-880e-dc969fadb547&skip=&p=48

 

I just looked at my April 2012 issue of Seahorse. No mention. Then I looked at March. Again, no mention.

So I went back and checked other issues. I didn't find any mention of the 14.20 design in any build table going back 2 years.

There was a 12 Meter design from Tilson first mentioned in the July 2011 issue. It was mentioned again in the August and September issues.

In October the mention was changed to "Standing by". That seems to indicate there was some question about the validity of the project. The "Standing by" mention appeared in November and December issues as well.

Then in the January 2012 issue there was no more mention of the project.

 

From Scuttlebutt tonight-(see link below for full article)

SCOW BOW: UGLY - BUT FAST?
By Elaine Bunting, Yachting World

The latest hot trend in ocean racing design is the scow bow. But it's ugly
and it looks as if it'd be brutal upwind

I'm torn when I think about the latest trend for ocean racing, the scow
bow. On the one hand, it's a fascinating development. On the
other...cripes, these new designs are ugly.

Round bowed scows have been well proven; the skimming dish designs have
long been popular in the US, though less so in Europe. Yet the design
principle made no major inroads into offshore design until last year, when
French engineer and solo sailor David Raison won the Mini Transat in his
self-designed mini 6.5m Mini Magnum/Teamwork Evolution.

This round bowed, push-me-pull-you 21-footer beat the 2nd placed prototype
Mini to the finish in Brazil by 130 miles - a huge margin in such an evenly
matched fleet - and recorded an average across the entire Atlantic of 6.8
knots.

He nicknamed his wide-bodied design 'le gros porteur', the jumbo jet, in
reference to its max beam, carried as far forward as possible.

Now there is a proposal from design group Reichel/Pugh for a 90ft scow (see
picture on website) designed to attempt to beat the Transpac record. We've
got a full report on this intriguing design in our May issue.

The basic principle of the scow design is to maximise hull righting moment.
The beam is carried well forward which means that, when heeled, the hull
lines are further outboard than with a conventional bow. This makes the
scow design very powerful when reaching, obviously important on races such
as the Mini Transat or the Transpac, which have a predominance of reaching
conditions.

It has the added advanced advantage of large reserve buoyancy in the bow to
prevent the bow from burying or nose-diving when driven hard off the wind.

Put that together with a canting keel, as is the case on David Raison's
boat, and you have a potentially very powerful yacht indeed.

However there are two snags with this design.... read on:http://www.yachtingworld.com/blogs/elaine-bunting/531437/ugly-but-fast

>Editorial Comment: Raisons boat was ugly when I first saw it. Thats been put aside as I've understood the brilliance of the design. But Bunting includes the new Reichel-Pugh boat as "ugly" I beg to differ-I think it is gorgeous! She also says scows slam upwind no matter how much they heel-thats certainly not my experience sailing as crew on an E-Scow in rough water in Pensacola Bay upwind many moons ago.

 

A scow would make for a very roomy and comfortable yacht. If only I had a few million to spend on something to cruise around

Scows remind me of sports cars



Very broad and powerful. They aren't ugly at all

 

Oh... I just fell in love!

 

Scow Mini

Found this in the Mini forum on SA: http://www.youtube.com/watch?feature=player_embedded&v=n1MmjU6Z3tc#!

website from u-tube vid: www.voiliers-revolution.fr


From the website microsoft translation:

After the victory of David Raison on the Mini-Transat 2011 with his sailboat flat and to bow rounded inspired by the scows Americans, David ROY of the shipyard AFEP Marine specialist construction naval aluminium and Quentin DELOUETTE, creator of the graduate School of Navigation Frenchnetwork officer first class of the school of the Merchant Marine and former skipper sailing, have brought together their skills and their ideas for build the first sailboat pleasure series flat and to bow rounded.

The purpose of this dream : revolutionize the pleasure. The idea is to use the volume offered by keel type scow inspired by the Works Team of David reason to provide a true sailboat cruise simple, comfortable and spacious.
This sailboat will be fun with a surprising keel and a generous canopy, solid because thick aluminum, going everywhere because dinghy, easy to live with materialsinnovatives requiring little maintenance.


At all levels, the Rêvolution 22 will be a surprising sailboat and revolutionary.

click on image:

 

While I think the rounded bow was a brilliant design to beat the rules the mini-transats race under, I just don't see it as a reasonable alternative for the boats not restricted by a LOA maximum.

 

There are other boating areas that are restricted in LOA in addition to racing, car-toppers and towed boats for examplem perhaps even marina-moored boats. These may also benefit from the extra capacity of a scow. The harsher ride wouldn't be a problem for folk not interested in challenging the elements. However, for home-builders there are concepts that are easier to build, such as the garvey.

 

Looks like one of the final steps in the development of the 'Mini'.

The last way to increase initial stability while keeping the hull and rig within the box.

This boat, not being a 'Mini' is an obvious spin off.

If I were ever sentenced to sail an over canvassed boat, I would choose a scow, particularly a high sided, rounded corner one like this.

Less likely to stuff its bow and less likely to pitch pole, more likely to plane instead.