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From: Doug Lloyd <dalloyd_at_telus.net>
subject: Re:[Paddlewise] drag vs. viscosity
Date: Wed, 19 May 2004 20:00:05 -0700
Matt Asked (snip):
>However, I'm still curious about why Doug wrote that kayaks are sluggish in
fresh water. If you are reading this Doug, please let us know.<

Matt,
I think it must be one of those long-held notions I inherited from the early
eighties, probably derived from comments by self-proclaimed experts and some
personal experience. I certainly haven't noticed much difference these days,
but back when my Nordkapp was still relatively lightweight, I remember
comparing fresh water experiences against saltchuck one's. My Nordkapp
increases considerably in waterline length fully loaded, and I seem to
remember feeling slower in fresh water. I don't recall much difference  when
comparing the two different water types in the kayak, unloaded. This is all
very subjective. With that in mind, plus the fact flat lake water just seems
to be a slower grind, probably contributed to my view point. After my post,
I figured anyone who wanted to correct my notion would speak up. See, we
even got Peter to wade into the discussion after a long dry spell on
Paddlewise, whereupon he just gushered out. ;-)

However, I still hesitate at the thought of heavily loaded kayaking on fresh
water, and can't totally dispel that notion as unscientific as it is. I
guess it's like buying an expensive stereo - why bother if the cheaper one
sounds just as good to your ears. But, if the subtitles are noticeable to
the individual, then do as you wish. I'll take the saltchuck. Maybe Joshua
can set me up paddling the Dead Sea. Might make my heavy Nordkapp feel
buoyant again. :-)

Doug Lloyd
Victoria BC
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From: Michael Daly <mikedaly_at_magma.ca>
subject: Re:[Paddlewise] drag vs. viscosity
Date: Thu, 20 May 2004 17:50:46 -0400
On 19 May 2004 at 20:00, Doug Lloyd wrote:

> plus the fact flat lake water just
> seems to be a slower grind, probably contributed to my view point.


It definitely does if there is no wind and waves.  I always feel 
sluggish in such conditions, even though I know it's an illusion.  I 
always say it's better to paddle in wind and waves just because you 
feel you're getting somewhere (even though you might be going 
slower!)

The worst is flat and calm with high heat and humidity - when you 
don't particularly feel like going fast.

Mike
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From: PeterO <rebyl_kayak_at_iprimus.com.au>
subject: RE: [Paddlewise] drag vs. viscosity
Date: Fri, 21 May 2004 19:56:43 +1000
Michael wrote: -
>It definitely does if there is no wind and waves.
>I always feel sluggish in such conditions, even
>though I know it's an illusion.

G'Day Michael and Paddlewise,

Are you certain its always an illusion?

What is happening to the wave energy in a slightly choppy sea (not a
following sea)? Is it possible that waves of a certain height and period
reduce the drag on a hull?

My reading of the literature can only find descriptions of drag increase due
to energy loss from the prime mover in a boat, i.e. due to the energy
required for the boat to create waves or turbulence.

I hesitate to quote experiences in a kayak as they have no validity in a
technical explanation! But of course I'm going to:~) Anyway I notice in
slightly choppy water I can readily paddle a sit on top, as fast as the
fastest sea kayak we have over here.

The fastest sea kayak we have in Australia is something called a Mirage -
ironic name considering the nature of my question!

All the best, PeterO
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From: Nick Schade <nick_at_guillemot-kayaks.com>
subject: Re: [Paddlewise] drag vs. viscosity
Date: Fri, 21 May 2004 10:52:29 -0400
Peter,
  If there was something about waves that reduced drag on the hull then 
you would expect the same conditions that let you paddle the SOT as 
fast as the other kayaks would also make the other kayaks faster so you 
would then not be able to keep on in the SOT.

  Unless you are going the same direction as the waves (i.e. 
occasionally surfing) the waves are going to increase drag on the boat. 
However, this effect will be more pronounced on some hull shapes than 
others. So it is possible that the SOT is not slowed down as much as 
another boat in certain conditions.

  I suspect the reason boats feel more sluggish on flat water is the 
lack of reference points for speed. In rough water there are always new 
waves approaching so even if you are dead in the water you get the 
illusion of motion. I'm sure many people have spent time paddling 
against a head wind and felt like they are doing OK until the look at a 
landmark only to find it hasn't moved.
Nick

On May 21, 2004, at 5:56 AM, PeterO wrote:

> Michael wrote: -
>> It definitely does if there is no wind and waves.
>> I always feel sluggish in such conditions, even
>> though I know it's an illusion.
> What is happening to the wave energy in a slightly choppy sea (not a
> following sea)? Is it possible that waves of a certain height and 
> period
> reduce the drag on a hull?
> <snip>
> I hesitate to quote experiences in a kayak as they have no validity in 
> a
> technical explanation! But of course I'm going to:~) Anyway I notice in
> slightly choppy water I can readily paddle a sit on top, as fast as the
> fastest sea kayak we have over here.
>
> The fastest sea kayak we have in Australia is something called a 
> Mirage -
> ironic name considering the nature of my question!
Nick Schade

Guillemot Kayaks
824 Thompson St
Glastonbury, CT 06033
USA
Ph/Fx: (860) 659-8847
http://www.guillemot-kayaks.com/
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From: PeterO <rebyl_kayak_at_iprimus.com.au>
subject: RE: [Paddlewise] drag vs. viscosity
Date: Wed, 26 May 2004 18:40:51 +1000
Nick wrote
>I suspect the reason boats feel more sluggish
>on flat water is the lack of reference points
>for speed. In rough water there are always new
>waves approaching so even if you are dead in the
>water you get the illusion of motion.

G'Day Nick and all,

Thanks for the explanation. My thoughts were somewhat influenced by a tour
in a Japanese factory where they had yards of vibrating troughs to transport
and manipulate electronic parts along a production line. Suspect its not a
good analogy and seems like I must consign my wave enhanced speed theory to
the dustbin of many illusions along with: -

- the feeling of paddling down a sloping wall of water when facing a bay
with hills behind it
- the sense that paddling home is safer than paddling away from home
- the illusion that a wet suit and sunglasses with a lens missing are
suitable for five star seaside restaurants
- polishing my boat will make it go faster
- Kleppers are the fastest kayak in Australia provided you have a 30knot
tail wind
- Mirages are the fastest kayak in Australia next to Kleppers in a 30knot
tail wind

All the best, PeterO
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From: Doug Lloyd <dalloyd_at_telus.net>
subject: Re:[Paddlewise] drag vs. viscosity
Date: Mon, 24 May 2004 21:25:58 -0700
Mike said (snip):
>It definitely does if there is no wind and waves.  I always feel sluggish
in such conditions, even though I know it's an illusion.  I
always say it's better to paddle in wind and waves just because you feel
you're getting somewhere (even though you might be going
slower!)<

Can't remember what I posted last week on this subject. I was pretty out of
it there for a week or more.

I did notice on the news a while back a reference to a trawler that capsized
just off the Fraser River delta: something about the boat being overloaded
and when it transited from salt water to fresh water the boat got into
trouble, but I haven't heard any follow up (other than the political fallout
from the fact that the coast guard weren't allowed to send in rescue divers
into the upturned hull due to some Worker's compensation rule - people were
trapped inside, including children).

Fresh or saltwater, I don't care, I'll paddle anything, as long as there are
waves/swell/wind. I just happen to be surrounded by maritime waters. If my
health continues to improve dramatically as it has suddenly this past couple
of days (finger's crossed), I'm gonna be all over it very soon. I may even
paddle on some flat water just to be different; but no lakes, which are
overrun with rowing shell participants, Geese poop, weeds, water skiers,
wobbly mums and dads in canoes, swimmers, training marathon racers,
fisherman, cottage noises, parking lot crime, and nudists. Did I mention I
prefer the saltchuck. :-)

On a different note, there were two marine incidents worth reporting. A
couple of old guys sunk their open boat while pulling up crab traps and
spent a few cold minutes in the water before a private vessel rescued them.
Due to age, they were rushed to hospital with hypothermia. No lifejackets
were being worn. It was the first time the coasties issued a specific
addendum to the news report in recent memory, pleading with small boaters to
wear their PFD's, etc.

The second incident was off Sooke waters, with the hapless boaters drifting
half the night, eventually toward Cape Flattery. They had no spare supplies
aboard and only a CB radio. They made a "Mayday" broadcast on the CB, but
were ridiculed by local radio clubbies as hoax initiators. Finally, a CB
enthusiast on the American side believed they were in distress, and called
in the rescue request. I think the vessel owner now says he will be
investing in a marine VHF.

Doug Lloyd (who prefers it salty and sloppy)
Victoria BC
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