RE: [Paddlewise] Bad Forward Sweep

Mike said
> Strictly speaking, the hull can be seen as pivoting around any point.
> Rotation is rotation and the rotation is the same regardless of
> inertial reference frame chosen.

G'Day,

Mike, You put forward an intriguing proposition and I'll try hard not to
misinterpret but looking at Matt and John's explanations I don't think they
are saying the same thing with different frames of reference. Their use of
phrases such as rotating around various points (John) and "pivot point"
(Matt) were fairly specific and I think in the context of the discussion
could be taken as synonymous. Surely also they are both using a common frame
of reference (latitude and longitude)?

John discussed the boat rotating around the center of flotation (COF) rather
than the bow which I interpret as meaning that the COF was a pivot point,
while Matt was saying that the center of lateral resistance was the pivot
point and didn't necessarily correspond with the COF. If the frame of
reference were latitude and longitude in both cases then the physical
ramifications of each interpretation would be quite different.

I found Matt's explanation of center of lateral resistance (the pivot point)
very clear.
John's points about effective arm extension differences in moving vs
stationary boats were compelling.
Much appreciated your historical references which I hadn't heard before.

All the best, PeterO

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