"Bill McKee" wrote in message
ink.net...

And your motor is not propelling machinery?


No, Bill, a motor is not propelling machinery, nor is a propeller,
propelling machinery, but used together,
they become propelling machinery.
Just for kicks, let's get a bit more complicated.
The only way you can be certain (reasonably) under the Rules, that a sail
vessel is also being powered by some mechanical means
other than the sails, is, in daylight, a cone, apex down; at night, she's
lit as a power driven vessel; or radio communications.
Barring any of those (excluding some sailboat making 10k in a 1k breeze...
possible exceptions noted) you should consider the sailboat
just that ..... a sailboat, and I send you back to rule 2.

otn