JD,If centrifugal force is the number one thing for rotary threshing, then why don't axial flows use itIJ Their big fat rotor turning at 300 rpm in corn sure as heck ain't going to generate much centrifigal force, yet that machine can thresh and thresh well along with an excellent sample. No hard feelings here, good luck with whatever machine you get. If you and yellow fever think I'm confused, that's okay. You guys need to relax a little. You can have all the c. force in the world, but if you don't keep it full, it's pointless. Case in point, this fall I had 130-140 bushel corn, I have an 8-row head on my 96, if I didn't go a minimum of 5-5.5mph I had a subpar sample (cobs grinding, and corn still on the cob) rotor speed and concave position didn't do much either way. The best solution was to put the pedal to the medal and dump the hydro and go. 18% percent corn and rotors at 550 and sample was beautiful. Concaves full open.