I think my darts are 72" x 1/2" with target points. I got them from Thunderbird Atlatls, Bob seems to be one of the gurus for the atlatl. I hope to be casting again soon. I am not sure of the spine on the darts but they do flex when cast. The wisdom seems to be your dart should be as tall as you are, but there are exceptions to every " rule"😀👹! I have been able to keep the darts in the target butts most of the time. The problem is I spend a lot of time explaining what I'm doing to the spectators! After all, that new technology has only been around 30, maybe 40 thousand years😂😀. Maybe we can get an atlatl emoji? Hint, hint
Hawkdancer