"beryl george" wrote in message
...

The boat weight is around 10 ton with a 50 foot
plus mast and a moderate keel that is level bottom.

All thoughts very much appreciated I have not seen
or done or attempted any thing like this before.


Sounds like extreme folly to me. The mast will bend, the lines will stretch,
the boat will teeter and tip one way or another. Then anything might happen.
And you are going to do this in among a lot of other boats? Think long and
hard about the consequnces of it falling over, then ask yourself how you
could ever have thought it was a good idea.

Tim W