a bloke had his chrono at a shoot last weekend and quite a few people were having a go of the "lie detector".
anyway here are the numbers i was getting with 2 of my bows for those who are interested:
RER vortex 51lb@30", 545gr arrow (10.7gr/lb) = 176fps average.
Centaur 53lb@30", 560gr arrow (10.6gr/lb) = 180fps average.
and gee you loose a lot with a poor release - i think a chrono can be used to tell you more than just how fast your bow is.
i like these arrows around the 10-11gr/lb mark for my hunting bows. and they are going quick enough for my eye - how good are these numbers though - i don't know...?