I'm buying a hickory bow that measure 66 inches and it draws 45@28.My question is what would the draw weight be at 29inches.
I think the standard estimate is 2-3 pounds per inch of draw. It depends on if the bow stacks past 28 inches.
+1 what Jake D said. 47-48@28.
Typically ~3#'s per inch, however the actual for your particular bow which is highly dependent on the bow design intent, could be quite different.
Shot an osage self bow in March at 3D event.
The bow drew quite smooth to ~27"s and then hit a major wall. I can comfortably draw to anchor, aim, hold, release and follow thru with a bow 10#'s heavier than the specs for this particular bow. My draw is 28" and beyond 27"s for this bow was not going to happen for me. It felt as if I was pulling against a mechanical stop. I tried it numerous times and was just perplexed.
Taking your own measurement will provide the actual.
Selfbows are normally tillered for a specific length. We always took them an inch beyond the customers draw. So a bow can actually be 66" and tillered for 27" draw. It will not like going longer then that.
Selfbows have to be taught to be a bow and it takes time and effort to do it right.
Mike