Chain Jamming in Windlass

[Capitain Mike]

Originally Posted by savoir

Nah, don't bother with the humble bit just check the numbers.

Even if the figures are accepted at face value the figure of 164.592lbs should be kgs. Small error but big difference. Despite that, the calculations themselves are incorrect.

You are reading numbers for the wrong size of chain which seems to be 8mm. 3/8" = 9.5mm so you may be thinking of 5/16" chain with your calculations. The boat is American so lets take an American brand of chain. Euro chain does have slightly different sized links and hence weights. Based on Acco G4 chain the system including anchor would weigh 685lbs. If the chain is BBB the total weight will be 665lbs. Acco quote the weight of 1ft of 3/8" G4 at 1.6lbs and BBB at 1.55lbs.
http://www.peerlesschain.com/downloa...10.pdf#page=16

svHyLyte was pretty much right with his estimate. It would be like sailing around with four large crew standing in the pulpit. Not good.

Even heavier than my quoted figures right or wrong.

[svcambria]

So 100 foot out 90lbs
So 150 foot out 135lbs
So 200 foot out 180lbs
So 250 foot out 225lbs
So 300 foot out 270lbs
So 350 foot out 315lbs
So 400 foot out 405lbs

Um, 100 feet of chain plus anchor would be 135 lbs
150 feet plus anchor is 180 lbs
etc etc to
400 feet of chain plus anchor is 405 lbs

Michael