Grading 60" Mower Blade Tip Speed.

marrt · Jun 1, 2003

60\" Mower Blade Tip Speed.

I remember a conversation several months ago about the hypothetical blade tip speed of the Power-Trac 60" mower. As part of the belt post, I looked up the speed of the Gresen motor at 8 rpm. I believe this speed to be 3187 RPMs based on 1000 RPMs for each 2.51 GPMs flow. The length of the Power-Trac blade is about 20.5 inches. Therefore the circumference of the blade turning one complete revolution is 20.5" X 3.1459, or 64.49". Multipling 64.49" X 3187 and dividing by 12 yields 17,128 Feet per Minute blade tip speed. Correct?

Anonymous Poster · Jun 1, 2003

Re: 60\" Mower Blade Tip Speed.

that would seem correct to me - also that is not that bad
- the fastest commercial ones are 18500 fpm but that is for the larger decks with 25inch blades

Schultz · Jun 2, 2003

Re: 60\" Mower Blade Tip Speed.

Everything looks good to me.

Now why didn't PT know this specification. Last fall I called them about the 425's 60" deck, they weren't able to answer this. Since 17k'/min is pretty good, you think they would include this in there specifications.

Thanks, you answered a I've been wanting to know.