Hello Uwe,
I do have double blocks, however, I find that the scale seems too crowded and most all the cannons I am rigging are on the second deck and most will not be seen.
you are 100% correct in all regards. In my study, I find several variations of single, double, etc. I also find a carriage that does not employ the rear pulley set.
Another situation is that the Block(s) that I am using has "two" holes. In my observation, a single sheave block should only have one hole and that is where the line passes through via the single pulley. However, these single sheave blocks have as you notice two holes. One on each end of the block. Therefore, I decided to be creative and use that extra hole to pass the line to make the fixed point. If you look at these two images, you will see the path that the line takes. It begins at the Carriage Block, then proceeds to Deck Block, then the line passes back to the Carriage Block, then after which the line terminates on the deck.
However, yes, I wish I should rig as you suggested, but I am thinking about the constraints I am working with. The two images show the block with two holes of that I have. The other image shows the block as supposed to with only one hole.
I hope that perhaps I explain the problem that I currently have - and yes, I wish I could find another better method.
I will consider the opportunity to change out the carriage side block with a DOUBLE BLOCK.
NOTICE THE TWO HOLES ON THESE BLOCKS
IN MY OPINION, THESE BLOCKS SHOULD ONLY HAVE ONE HOLE. HOWEVER, THIS IS NOT A MAJOR PROBLEM. NOTE THAT I REMOVED THE
EXTRA HOLE IN THE DRAWING BELOW.