Good info, Jim.
to make it easier for people to compare the data sets, Here's James' data in the same format: Catalina 30, 25' LWL, 10,200lb displacement
Speed - Drag - Watts - HP
3 - 35 - 663 - 0.88
4 - 60 - 1485 - 1.98
5 - 100 - 3200 - 4.27
6 - 180 - 6000 - 8.0
The numbers are a bit higher as we would expect for a boat that has twice the displacement with a small advantage of waterline length.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "luv2bsailin" <luv2bsailin@...> wrote:
>
> Hi Guys,
> These numbers for my Albin 25 fit fairly closely with what Eric is saying. This is a 5000lb boat with a waterline of 22.2 ft.
> Speed Drag Watts HP
> 3 32 490 0.7
> 4 60 980 1.3
> 5 128 1960 2.6
> 6 193 4300 5.8
> I didn't get a lot of data points on the drag numbers so had to do some rough interpolating, but you can see the trend. You'll notice the drag builds up more at the higher end compared to the 30-footer, due to shorter waterline length. It's interesting to see how the power just about doubles for each knot. I've seen similar results on other boats and I think it's pretty typical....
>
> Jim
>
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