Subject: Re: baidarka bow/prow design of a kayak
From: James Mitchell (mariner@seanet.com)
Date: Fri Feb 16 2001 - 23:52:07 EST
Greatly. It also increases the load that must be lifted in order to climb
that bow wave.
----- Original Message -----
From: "wolfgang brinck" <nativewater@yahoo.com>
To: <baidarka@lists.intelenet.net>
Sent: Friday, February 16, 2001 2:37 PM
Subject: Re: baidarka bow/prow design of a kayak
> Wouldn't pushing the bow wave further back also reduce
> the effective water line length of the boat and limit
> top theoretical speed?
>
> Wolfgang
> --- Douglas Ingram <redcanoe@pangea.ca> wrote:
> > In general, keeping the entry waterlines clean and
> > gentle is a pretty sure
> > way to go. If you make them too sharp, you are only
> > delaying the widening
> > of them to further back in the boat, making a
> > blunter shape. If you wish to
> > make concave entry watelines, I would suggest
> > keeping them to a modest
> > amount of concavity. I feel that the biggest
> > advantage of fine entry lines
> > has less to do with simply parting the waterflow
> > around the hull, and more
> > to do with reducing the bouyancy of the bow that is
> > trying to climb the bow
> > wave, theryby maintaining a more level trim.
> >
> > Douglas Ingram
> > Red River Canoe & Paddle
> > Lorette, Manitoba
> > ----- Original Message -----
> > From: Douglas and Leticia <huftdecruz@earthlink.net>
> > To: <baidarka@lists.intelenet.net>
> > Sent: Thursday, February 15, 2001 2:21 AM
> > Subject: Re: baidarka bow/prow design of a kayak
> >
> >
> > > I am trying to spend more time really surfing and
> > or building my new boat
> > so
> > > I will keep it short.
> > > I have not kept up with commercial boat trends
> > very well, however I cant
> > > help but to notice the boats built by Necky that
> > appear to have a concave
> > > shape to their bow resulting in a fine entry at
> > the waterline and a fuller
> > > buoyant planing sort of shape up at the top (near
> > the gunwales). This
> > shape
> > > is not entirely unlike the bow of a typical Aleut
> > baidarka if you imagine
> > > the split being filled in(on the baidarka). Have
> > you ever tried to
> > stretch
> > > a material into a concave shape? I think that is a
> > pretty good excuse for
> > a
> > > bifurcated bow. Others might point out the
> > similarities to the bows of
> > > super tankers and the concept of canceling out a
> > bow wave with your other
> > > bow wave.
> > > As far as Greenland boats are concerned, It seems
> > to me that the cross
> > > section of a Greenland bow would look like a
> > triangle, now just gradually
> > > stretch out the point at the bottom of the
> > triangle on a diagonal
> > trajectory
> > > upward(making the most out of the skinny/pointy
> > part of the triangle/keel)
> > > till you create a point and you will also end op
> > with a fine entry and
> > some
> > > volume up top. Unfortunately you will have a
> > longer boat with a relatively
> > > shorter waterline compared with the Aleut design.
> > > My new boat in the works should offend or appeal
> > to purists who favor
> > > either design. Its only 14 ft long so that it will
> > be more fun to
> > > surf/rockgarden paddle with all those folks who
> > paddle Coasters into those
> > > tight spaces or big waves on the open coast here.
> > It has an upturned lower
> > > jaw with a fat(wide) upper lip and a typical Aleut
> > stern shape. The
> > > departure from the typical Aleut craft is in its
> > extra full bow, tubby 22"
> > > beam, short 14' length, low flat back deck/raked
> > cockpit to facilitate
> > > rolling and such and last but not least a very
> > pronounced single hard
> > chine
> > > for carving a turn whether on a wave face or windy
> > crossing(absolutely NO
> > > rudder thanks). The main problem with it is that
> > it will be slow, but not
> > as
> > > slow as a coaster. I am not too concerned since I
> > already have a 18' long
> > > 19" wide straight jawed baidarka.
> > > Incidentally my first boat was a "sleek" Greenland
> > style boat and the
> > first
> > > time I saw an Aleut type boat I thought it was
> > quite ugly but somehow they
> > > grew on me . Check out some of the bifurcated
> > Aleut boats that have a
> > > straight lower jaw that doesn't curve up, you
> > might like that design even
> > > though you have to be careful not to plow too big
> > a furrow into the beach
> > > when landing straight-on in surf.
> > >
> > > Doug(who has only built aluminum frame baidarkas
> > to date but is looking
> > > forward to building a wood framed boat in the
> > future.
> > >
> > > -
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