'Typical' Halyard Diameter?

[UnlikelyVoyager]

Originally Posted by Pblais

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Good idea to inspect the sheaves on the mast when changing rigging anyway. Get a look and make sure it's still smooth and secure up top. Blowing out a sheave under sail could be bad.

For really traditional boats they make a nylon that has the look of old ropes. It's modern and strong but looks more in character. I don't recall who makes it though I'm sure someone here can tell you. You need to check the blocks for the max sizer they can handle. 7 times rope diameter is the standard for modern blocks. Not sure about old fashioned blocks. Too big a rope and the rope won't run smooth.

Maybe you are thinking about Spunflex?

Quality rope for ships of wood

You must have read my mind. I'm going to use this to replace the missing jib halyard, and gradually replace all the other lines. I volunteer on a 100 year old gaff-rigged sloop that uses Oceanus sails and Spunflex lines. A very good look, and the lines feel like the real thing.