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Forum: Lagoon Catamarans

25-08-2017, 17:29

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

It would read 20 pounds, but then the scales are not measuring the compression force along the length of the mast, just the weight of the bucket.

Forum: Lagoon Catamarans

25-08-2017, 15:20

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

If you put a spring scale on the ceiling and then a pulley at the bottom of it, then hoist up 5 pounds, what do you think the spring scale will read while you hold the line at ground level.?
Try it...

Forum: Lagoon Catamarans

25-08-2017, 14:11

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

Remember we are talking compression load on the mast. If you think about it, the load from the bucket is 20 lbs sitting there by itself. But to hoist the bucket up will require 20 lbs of weight to...

Forum: Lagoon Catamarans

24-08-2017, 06:35

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

This topic was covered in https://www.cruisersforum.com/forums/f151/42-leopard-do-i-really-need-a-double-halyard-57968-3.html#post823720

Also to test the physical theory I got a boat hook and...

Forum: Lagoon Catamarans

23-08-2017, 13:02

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

Try googling 2:1 halyard v mast compression - consensus seems to be 2:1 reduces compression by 25%. This is reason a lot of high performance dinghy's go for 2:1 or even a halyard lock (which reduces...

Forum: Lagoon Catamarans

23-08-2017, 12:08

Replies: 24

380 S2: Block on top of 380 mainsail or not.

Views: 5,457

Posted By Bean Counter

Re: Block on top of 380 mainsail or not.

I think using a 2:1 halyard lessens the compression load on the mast compared to a 1:1. So less wear and tear on the mast from compression loading I guess.

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