Well Cornfed, if you can give me a formula or something to figure the arrow speed,I will be happy to give you that info since I dont have a chrono. But what I can tell you is that I use 100 gr. heads that have 11.0-11.25 FOC. And getting that arrow straight as possible is why I am asking as well as the accuarcy, I totally agree with you on that! Thanks again, and hope what I did provide helps more, and hopefully i can figure that arrrow speed.