"toad" wrote in message
s.com...
On 14 Oct, 15:16, (Steve Firth) wrote:

Nor in the case of the motorsailer will the apparent wind be from
dead
ahead.

Oh yes it will!


If only these ******s could learn to draw a simple vector diagram. They
would soon see there are no other vectors than one from the rear (motor
power) and one from the front (apparent wind drag). Duh!

The vector from the rear will be longer than the one from the front. But
the one from the front will effectively shorten the vector from the
rear. The result is a slower forward speed than if the boat was powering
forward in a vacuum where there would be no vector from the forward
(from the apparent wind, at least.)

Only when there is some wind other than apparent wind can you add any
sort of sideways vector to the diagram. The advert is WRONG! It
demonstrates a common ignorance that many sailor harbour.

Wilbur Hubbard