Hi Jared,

Upon further review I would like to modify my previous  email for Paragon ratings.

If we use a 500 lbs limit that Jared proposed we need a minimum rating of 1.75 times ( 46cfr189.35 wet weight handling gear uses 1.5  ) so 875 lbs pounds is what the structure should be rated for.

This falls  within  Farleys  rating of 800- 1000lbs SWL for the boom/mast structure .

At 875 lbs the wire or rope should be a minimum safety factor of  5 , so 4375 lbs. Since turning blocks have moving components they should be
  considered running rigging so a 2 ton rating would be appropriate.

500 desired x 1.75 (dynamic) = 875 (well within the 800 -1000 lb rating of boom structure from farley shane.  As such we are outfitting the rigging with gear safe to 5 times that (5:1).  Chris' conversation with a Carpenter rigging specialist indicated that rigging hardware is already rated 5:1.  Therefore outfitting the boom with 1000 pound hardware is adequate so long as it is initially 5:1 rated.

As for the winch.  A 1000 Warn hoist can pull much more, but it will never be excessively loaded, so no need for a load restrictor.  It should be adequate for our intent to lift 500 (875 dynamic) loads.  The rigging in rigged as gun tackle so the line pull required for a 500 lb load is only 250 (437.5 lb dynamic).  This winch should not have trouble with that.  I am using a 2250 SWR pulley on the boom since it will see less loading and a 3350 swr pully on the load.

Unclear whether Farley's rating includes the safety factors.  Would be nice to know what we can pick and not restrict ourselves to 500 lbs.

From Chris (Phone) on 2/13/14

He spoke with carpenter rigging.  they clarified that all rigging is rated at a 5:1 safety margin.  He has revised our requirements such that all running rigging need only be 1/2 ton (1000lb). 

I spoke with Warn winches.  We should only use a hoist.  Different braking system.  They are de-rated so a 1000lb winch will pull more.  Sales rep thought the 1000 pound would pull out load no problem.  All hoists are derated 5:1 for safety so in theory the 1000 lb rated winch is more likely a 4000 lb winch.  For 500 lb loads we will be fine.