on an average run....

[EATMYWAKE]

what batterys should i get if i get the 3 bladed grim racer prop --- http://www3.towerhobbies.com/cgi-bin...?&I=LXVST0&P=Z what run times will i get? and lemme get this streight... if i get a ul-1 after 6/15/09 i dont have to worry about the turnfin area cracking?

thanks