On Mon, 22 Nov 2010 21:37:09 -0500, Wayne.B
wrote:

On Mon, 22 Nov 2010 17:49:24 -0800 (PST), Joe
wrote:

Have been on a hundred boats with 25-72 inch props and had to chain
them down many times to prevent damage to the gears. As I said the
power is massive and you had better have heavy chains and binders.

Joe, my trawler has 30 inch, 4 bladed props on 2 1/2 shafts. Can you
suggest a procedure for safely binding/chaining a shaft while
underway? I was thinking about something like 3 or 4 loops of 1 inch
line terminating in a block and tackle lead to an overhead beam.

If you are serious the usual method is to install a shaft brake.
Mechanical or hydraulic disk brake.

Cheers,

Brice