Anyone can cut at that speed, but getting the QPC that is required to make a consistant living is another thing. Some simple math when you know the circumference of your drive tires, the length of your blade, and the RPM's you're actually running will show that you simply don't get enough blade strikes per inch of forwards travel at those speeds to get a smooth, cleab cut like that required for nice lawns.
I will also add that even with a suspension system to smooth out your ride, the cut suffers from the deck bouncing around more than it needs to, or would at a more reasonable speed. It sure doesn't do anything good for the longevity of the machine IMO.
One other thing, you may be able to double cut at those speeds and still end up getting done faster, but why use the extra fuel?
Last edited by Ridin' Green; 09-29-2012 at 08:42 PM.