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photofr wrote: Aurelius:
Surfskis are part of the kayak family: this without a single doubt in mind. Just ask ACA (American Canoe Association) or the FFCK (French Federation of Canoes and Kayaks).
Can we therefore say that a downhill bike isn’t a bike?
How could we possibly claim that a surfski isn’t a kayak?
Calculating a craft’s efficiency cannot be easy. It may actually be very costly. A “solid” test would be to take a human on machine No. 1 to travel say 20k, and then take the same human on machine No. 2 to travel the same distance. Comparing the average speed may tell you a lot more information than 72% efficient.
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photofr wrote: I feel that measuring watercraft efficiency isn't going to be an easy task. I keep telling people that the 560M is super fast, faster than most surfskis in sprints... people try it and agree that it "feels" faster... but it brings questions:
Where's the measuring tool for efficiency?
What is it called?
What does it do?
Does it take into account smaller or larger paddlers?
In the end, we could probably prove that a ski deemed "inefficient" could be faster in huge downwind conditions - even in the case where stability wouldn't be an issue.
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photofr wrote: You make measuring watercraft efficiency quite simple. I must ask: Why haven't I ever seen or heard about a single person measuring the efficiency of a surfski?
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photofr wrote: To determine which human powered watercraft is fastest seems quite simple. To determine which watercraft is most efficient may turn out to be a whole lot harder - with or without a power meter. There are just so many variables to take into account. Coming up with an exact efficiency % for a given watercraft would be so interesting, but so far fetched: there are just so many variables involved.
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