I read that too. Ed Speer's book says to take your height + 2' + 24" (for the knots)+3" for seams.
The only thing that I can come up with is that the 24" includes the length of the tapering from the wide part of the hammock to the knot.
I am measuring 8' knot to knot when I started with 12' of fabric. Taking out the removed material I am using 3.9 sq yards and using the Speer equation I would need 5.9 sq yards. I'm not sure if that is helpful but I think it is telling me that I need to start with more material. I think I need to remake a Speer style one using his dimensions, then remake the asym with the longer dimensions.
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