Re: A new mower model \"Mow All\" coming soon...
</font><font color="blue" class="small">( Check out " air foils ". Thats basically all a rotary blade is. You could write programs to optimize the blade configuration based on the Froude number of a grass air mixture.
Egon )</font>
Egon, maybe, you don't remember well. It is true that Froude number (ratio of inertia forces to gravitational forces) is used to model an aerofoil, but our this blade of, especially, finish mower can't be modelled using Fr number because its speed is very high (17,000 feet per min.) That is, Reynolds number is high. But This blade can't be modelled by using Reynolds number because the air flow around the blade will like be very turbulent due to the speed of blade and its "irregular augering" the air+grass mixture. As you may remember, modelling turbulent flows are very difficult if you want to make a precious model which will simulate the prototype.
Anyways, since this prototype (mower) isn't so expensive we don't need to make a model. Prototype flow will easily be simulated on a computer screen by directly solving its simplified 2-dimensional equations directly from general flow equations. Its only difficulty in the computer modelling is it is mixture of air-grass and it is turbulent motion which is very difficult to simulate and which may also cause cavities in the flow around the blade.
Anyways, these are technical things you and a few other can understand. I can conclude that finish mower blade can easily be used also as a rotary cutter blade as the finish mower blade is rotating at much higher speed than rotary cutter blade and this high speed of finish mower blade will apply sufficient force to do even very heavy tasks that are being done by rotary cutter blade. The only change to be done in finish mower to be used also as a rotary cutter is to change its deck design of finish mower so that it will also allow the long/heavy grasses enter into the blade area. I am surprised that designers/manufacturers of finish mowers/rotary cutters haven't considered this yet. Maybe, it was because they have respected/been thoughtfull about manufacturers of rotary cutters only. If they made a Mow-All mower, today rotary cutter manufacturers would be disappeared in the field. Anyways, I guess we'll see a Mow-All mower soon in a year or two.
And, don't belittle such items, they don't burn any kind of energy (oil, electricity, etc) when operating. your muscles gain energy. 
