Kal-P-Dal wrote: This may be a little of topic but I am very interested in these speed definitions. (JUST TURBOFINS!) Thomas, I think everyone else is done with the subject by now so it's probably safe to wander off topic at this point. 
You could consider these as speed ranges rather than definitions. More correctly they should be called "40 CPM" cruise and "60 CPM" cruise. To make the tests repeatable, it was desirable to work with a constant cadence. Forty CPM because it felt like a leisurely pace that a typical user might use as a practical matter so this was arbitrarily called a slow cruise. It could have just as easily been 35 or 45 CPM.
Not knowing if the fin performance relationship was constant, I picked a second speed to compare the fins at. It takes a lot of concentration to maintain a specific cadence from run to run, so I used 60 CPM or one cycle per second -- easy to stay on pace with a stop watch. Again it seemed like a reasonable pace to sustain for awhile for somebody who was more in a hurry to arrive at a destination -- hence "fast cruise".
for anyone who cares, all these tests were done with a flying start on a 100 meter course, alternating East and West for a minimum of 4 runs, with any spurious runs being rejected. The results were reasonably constant for any given day.
Sprints consisted of 20 cycles at maximum effort with a running start of over 5 MPH in smooth water, no tide or current, minimal wind, alternating directions. Variartion was about =/- .2 MPH.
For exercise I usually run a "one hour cruise" (also called a "fast cruise") with the objective of going the maximum distance within one hour. In the Adventure with factory Drive (Turbofins), speed ranges between 5.3 MPH and 5.6 MPH; with a modified Drive I usually can get another .1 MPH. So it's a virtual race of sorts. I also like to use this to compare different hulls.
Not being particularly strong, I rely very heavily on Drive and fin tuning to get the most out of my limited resources -- minimum Drive friction and maximum fin efficiency are huge in achieving the most thrust for the effort!
Everybody has their own pace, stroke length, etc. etc., so for most, the useful significance of this data is the comparison of relative performance -- how much difference is there between the fins, and is it worth the cost. For crazy speed demons such as yourself, I think the next step is to experiment with your Drive set-up to make sure it's giving you its full potential.
We're definitely fortunate to have someone like you to document the unique potential of the Mirage Drive over a variety of distances, as shown in your race series:
1km - 0,621miles - 00h-06m-09s - 9,756km/h - 6,062Mph
5km - 3,107miles - 00h-32m-27s - 9,245km/h - 5,745Mph
10km - 6,214miles - 01h-07m-29s - 8,891km/h - 5,525Mph
25km - 15,534miles - 03h-10m-19s - 7,882km/h - 4,897Mph
100km - 62,137miles - 15h-33m-00s - 6,501km/h - 4,039Mph
122,2km - 75,932miles - 24h-00m-00s - 5,092km/h - 3,164Mph
Great stuff! 
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maybe I have and I just found out 