Brian Nystrom ) writes:
William R. Watt wrote:

That may not be a
problem for knocking about on your own but if you are on a trip with a
group and their hulls are smooth you are easily paddling 10% more to keep
up.

Exactly where did that figure come from? The tests I've seen indicate
that scratched hulls have ~2-5% more drag smooth hulls, with badly
scarred plastic hulls with lots of "hairies" being at the high end. The
difference with fiberglass boats is minuscule.

the reference is long gone. it said one season's scratches add 5% to
hull resistance.


That's like paddling 11 hours to their 10.

No, it's not like that at all. Even if your 10% figure is correct, it
pertains only to surface friction on the hull. That's only one component
of the total drag that must be overcome by the paddler. Wind resistance
and especially wave making resistance can be very substantial components
of total drag, depending on boat speed and weather conditions.
Realistically, a scratched hull will require you to paddle ~1-2% harder
than a smooth one. Unless you're racing, you'll never notice the difference.

where does that 1-2% figure come from?

at sustained (cruising) paddling speeds hull resistance is still the
biggest component of total hull drag when comparing identical boats. there
are some numbers in a file on my website under "Boats" on average hull,
wind, and wave resistance, and energy consumption. a paddler can't put out
the power needed to maintain high wave making resistance speeds for any
length of time. it's a concern for racers. your point about wind and wave
resistance is well taken. however, considering the money spent on paddles
to reduce effort, the scratches on the hull matter. I don't think 10% is
out of order in anything less than rough conditions. I was trying to be
conservative. I don't have figures for paddlers but cruising sailors
experince moderate conditions most of the time. Rough conditions most of
the time would pretty well eliminate such passtimes as paddling and
sailing.




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(William R. Watt) wrote in message ...
Alex Horvath ) writes:

Anyone else do something similar? This may seem somewhat extreme but a
loaded glass boat on rocks in the surf zone will take quite a beating.

Yes. It's always better to load and unload the boat in the water. It's
also better if you can get in and out of a small boat with the hull afloat
parallel to the shore.

I've been to a couple of used boat sales, beat up rentals being sold by a
canoe manufacturer. The hulls are badly scratched up. That may not be a
problem for knocking about on your own but if you are on a trip with a
group and their hulls are smooth you are easily paddling 10% more to keep
up. That's like paddling 11 hours to their 10.

BW the boat rental business looks like quite a racket. The boats are
rented and get really beat up, then they are sold for half the original
purchase price. It's not just the renters who beat the boats up. I've
seen employees tossing them about like fire wood. The bottoms of the
hulls I've seen at the sales are criss-crossed with deep gouges - more
than a 10% difference in paddling effort there.

10 % on a glass boat would indicate a lot of scratches.
There remains the ugly fact , you are going to have to bring that boat
ashore and sometimes a host of issues will make you follow the wave
ashore and land on a beach. Most rocks will be rounded but it is
still a bump.
10 % I think remains a little high for scratches, Gouges and haugs in
a plastic boat though may excede that .

I buy boats to use , all my boats have a nick , ding, scratch and my
NDK had a large star crack. I deserve every ding and scratch but the
star crack is a mystery to me.
Glass can be fixed, so can plastic but it is not as easy and not as
likely.
Glass is a nicer boat to paddle.

Alex McGruer ) writes:

There remains the ugly fact , you are going to have to bring that boat
ashore and sometimes a host of issues will make you follow the wave
ashore and land on a beach. Most rocks will be rounded but it is
still a bump.

Got me there. All my paddling is on lakes and rivers with no swells
or surf, and in open boats which are easier to get in and out of.
I can see where Kayaks would present special problems.

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