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(ET) Mower blade speed



Does anyone know what the minimum blade tip speed should be before the blade tears the grass versus cutting it clean?
 
I found the following links that calculate this speed.  It looks like our Elec-Trak blades max out at 155 mph.
 
Should a person rewire the motor for 24 volts and run it at 36 volts to raise the rpm?  Maybe run 2 blades per motor in a +?
 
Any thoughts?
 
http://www.hoverhawk.com/propspd.html
 
http://www.pponk.com/HTML%20PAGES/propcalc.html