I did the math, but did not have the exact size of the PTO pulley (I used 6") or outside spindle pulleys (I used 5"), so this is not true RPM numbers but a representation of what is going on.
Before:
PTO- 1000 RPM, deck drive pulley - 857 RPM, outside spindles - 1114 RPM
After
PTO- 1000 RPM, deck drive pulley - 1200 RPM, outside spindles - 1080 RPM
So based on that, the middle spindle gains 343 RPM, or 5.71 RPS, or 70%!, the outside spindles spin 34 RPM, or .6 RPS slower, or 3%.
I will try again with the real PTO and spindle pulley sizes, but the percentage should be close.
I doubt the two little blades will be overly effected, but that large blade will be humming!
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