Originally Posted by Ridin' Green
I'm not an engineer or mathmatician, but I do know/can hear when my engine "bogs" down, and I can say for sure that heavier blades require a lot more resistance from the grass to slow them down than lighter blades do, and the lighter ones will recover more quickly. The difference in slow down, and thus recovery time never seems to equal the amount of extra drag required to slow them down over the lighter sets in the first place. Another point that needs to be made is that once the baldes are spinning full RPM, it doesn't take any more HP (if even as much) to keep them spinning due to their extra mass/inertia. Also, a lighter blade wil slip on the belt quicker than a heavy blade will since it is more easily held back by thick grass all other things being equal.
All the theortetical/opinion stuff aside for the moment, the G6's for my machine are the same width, and thickness as the stock blades, and the lift isn't any more pronounced than the OEM high lifts has, so spinning them won't be a problem (for me anyways).
I'm no engineer either but there's a much bigger overall picture here being that you have to in vision theses mowers of ours as automobiles and that frictional Hp loses are going to occur through the drive train,(these loses simple aren't unavoidable),which in our case would be the belts,deck and the blades would represent the differential. Having dragged raced for several years,I can tell you for a fact that going from a 8 3/4 rear end to 9 3/4 ,that gained masses from the drive gear and pinion gear required more HP to turn at all given RPMs over the lighter 8 3/4 unit. You simply can't have you cake and eat it to when converting over to the G6 blades,you're going to lose something regardless what HP your mowers packing.You just need more HP to sustain the same or higher blade speeds with the G6s on smaller engine displacements is what I'm trying to say.
If you'll do a search on the Meg Mo system,members who tried converting over notice a drop in power to sustain the exact blade speed. I'm in no way knocking the G6s and I just want a lighter blade