Blade tip speeds for 52" 60" 72"

[webdrifter]

I went to the Hustler web sight and printed out the specs on the Super Z. They are as follows for blade tip speeds.

52 in: 18,900 fpm
60 in: 18,350 fpm
72 in: 18,800 fpm

I can understand why the 60 " would be less than the 52" , but why is the 72" faster than the 60"? I,m considering a Super Z with the 60" deck, but I also want maximum blade tip speed for the better cut.

Which engine is used to figure these speeds?

[mowerconsultant]

Does not matter what engine is used, the blade tip speed is the same no matter what engine is installed on a particular unit.
As to the question on the blade tip speed difference on the 60", I will have to get a answer on that one, I will e-mail the department and find out and post an answer for you as soon as I have it.

Pj