In looking at my post I am sure few if any people understood what I waa asking for. Here is a better description of my problem.
I have an O Day Daysailer 3 for drysail at the Nyack boat club. We have several 1000lb hoists for Lightnings, Thistles, etc and 5000 lb and a 10, 000 lb hoist for larger boats. There is only a bulkhead so all drysail launches must be by one of the hoists. A Daysailer weights about 600 lb so it goes on the small hoist. However this requires a lifting bridle to connect (2) lifting eyes just to the rear of the shrouds, (2) lifting eyes just forward of the transom and the hook from the hoist. It will form a large X with the front legs of the X of one length and the rear legs of 2nd length. The length of the legs should be such as to allow a four point lift and balance the boat while it is in the air. I have been on a trial and error binge with many trials and all errors. I was hoping that someone else had solved the problem and could give me dimensions so I could just "do it"
Hope that makes my dilemma clearer.