and just how long, in the sort of weather where you are going to need this, are you going to spend on deck rigging all this to ensure proper load sharing of all these points? That prospect is a real horror.[QUOTE
My own solution would be to rig a bridle starting at my samson post (which passes through the grp deck reinforced with 4" of ply and then down through the keel with a stainless plate below) round both bow cleats, round four midships cleats and round both stern cleats. The bridle would be nylon.
I will trust the horizontal chain plates I fitted (500x50x6) on my own wee boatie and have the drogue attached in a couple of minutes.[/QUOTE]
This is the sort of arrangement that can be rigged with no impact on running the ship before the dreaded strikes. The use of nylon allows just a quick hitch on the cleats and middle eye needs to be dropped over the samson post. The bridle would, of course, be pre-prepared. Time? Even in a sea, a couple of minutes.
I have seen so called samson posts ripped out of a foredeck during a tow. The thought of the stern being gradually demolished terrifies me! It just does not seem seamanlike to put such shear loads on a hull. If you must secure to the hull, surely you should spread the load sideways as well as longitudinally.