Thanks Greenlake!
I see you added an extra full turn between the apex and the boom. Much shorter than from centerboard to boom. I think the defacto setup is to go through single block at CB trunk, then single block at mid-boom, and then single block at end of boom, then triangle. That is 3 half turns. 1.5:1 ?
If I read correctly your triangle is affixed separate, adjustable, and terminates at the apex with a block. Your sheet goes through blocks at CB, Mid-boom, end-boom, apex block, and back to end-boom becket. The turns are half, half, half, whole. What does that give you? 2.5:1 ?
Also, considering...
Only that the purchase will let him or trade distance for force.
I have a mid-boom 3:1 (well, it is whole, whole, half turn, so is it really 2.5:1?). Let's round length out here for simplicity. Lets say one full turn of my sheeting system presumably has roughly the same distance you have from CB to apex (which does not exactly, you will have a tad more sheet). Then let's say I have roughly twice the length of sheet on the second turn, compared to the turn you have between end-boom and apex block.
When sheeted in your setup seems like it would have near the same holding power. However, as soon as we start sheeting out, I presumably have to let twice the length of sheet out. The length between CB and end-boom is static for you. The turns between end-boom and apex are much shorter than the distance of my second turn. The length between all my turns is dynamic in length, in some exponential form increasing as the sheet is let out.
So, considering that the statements I have made are accurate (looking for a little reassurance here
), then I would presume 2 things...
1. The length of sheet that the 3:1 mid-boom setup requires is more? (Due to both turns being dynamic in length as the sheet is let out, and the second turn inherently starting at a lengthier position)
2. Based on trading "length for power", the 3:1 mid-boom purchase gets increasingly "stronger" the more it is sheeted out?
Now let me try and prove myself wrong (or at least profess my insecurity based off the info I found... lol)
Based on D&R Marine's site:
The 3:1 mid-boom should have 25ft of sheet
The end-boom traveler setup should have 40ft
Reference:
http://www.drmarine.com/products.asp?cat=122However... That 40 ft of sheet considered by D&R will continue to follow past the apex and continue to form (and be a part) of the triangle. You have made the triangle separate, so that length should be subtracted from presumed 40ft. At any rate, with the traditional traveler setup, (I think) the triangle length is still static, and should be subtracted if you are trying to compare how much sheet will be puddled in the boat. So for comparison's sake, if we wanted to find out which required less extra sheet puddled in the boat, mid-boom vs end-boom (either traveler or split-tail), I believe we need to know the length of sheet used up until the end-boom block on your boat?
So, in the least perverse way I can think of to ask this question... "How long is your sheet?" lol.