calculating bow speed

PSEsniper · 12-02-2002, 02:38 PM

I saw a post a while back on calculating the number of inches the arrow drops from 20 yards to forty yards to figure out the speed. Does anybody know the numbers for that.

NewYorkHunter · 12-02-2002, 02:50 PM

Spread between 20 & 40 yard groups using 20 yard pin at both yardages:
220 fps (28.7&quot

240 fps (24.2&quot

260 fps (20.6&quot

280 fps (17.7&quot

300 fps (15.5&quot

320 fps (13.6&quot

330 fps (12.8&quot

BGfisher · 12-02-2002, 05:11 PM

Yeh, that chart comes from edersbow and it doesn't work. I tried it and it was 34fps faster than my bow chrono's. According to the chart my bow shoots 294fps. From 20 to 40 yards there was right as 16" drop (2" groups at 40). That computes to 294fps. Too many chrono's said 260 + or - a couple.