string length. longbow

[brians306]

I am making a maple board bow. I am just a little concerned on my string length. is it measured from the tips of the bow or the string grooves? thanks

[Jim Davis]

NTN--nock to nock. About three inches shorter than unstrung ntn length.

[brians306]

So if the knock to knock is 66.5 would I round up to 67 or down to 66 for the string length?

[willie]

you are sizing for a premade string?

When figuring out the correct length for your bowstring,you’re likely to come across the acronym “AMO.” This stands for ArcheryManufacturers and Merchants Organization, and it represents a uniform system ofmeasurement for recurve and longbow bowstrings.

Let’s say you have a 68-inch recurve bow. You might think,“Well, I need a 68-inch string.” What you need is a 68-inch AMO string, whichwill actually measure 64 to 65.25 inches long depending on the bow and thestring material.

from the lancaster archery > blog > product info       section
your own could have a loop on one end and a straight on the other for multiple uses (tillering) with a bowyesr knot