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Old 01-16-2010, 11:01 AM
sampler sampler is offline
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Blade tip speed

I have seen manufacturers blade tip speed ratings from 18,000 to 19,000 fpm.

Is that significant in how the mower cuts and the lawn looks after mowing?
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Old 01-16-2010, 11:26 AM
topsites topsites is offline
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No, not really, at least not on a new mower, and I say I don't think so because they all say that,
way I see things it's meaningless technical jargon designed to make lookers go 'wow look' which
then that's supposed to make you reach for your wallet and start throwing money at them.

Did it work?

Odd, aren't the nerves of the eyes connected to the hand reaching for the wallet?

And it's not that all specifications are BS but this fps blade tip speed is certainly not one
of the specifications I care a whole lot about, as one might have gathered.

Last edited by topsites; 01-16-2010 at 11:33 AM.
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Old 01-16-2010, 12:03 PM
dbear dbear is offline
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Generally speaking, the faster the blade tip speed, the faster the unit's cutting ground speed. Something that seems to be important in this industry. So BTS is not entirely BS.
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Old 01-16-2010, 12:16 PM
kenneth meals kenneth meals is offline
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Blade tip speed has alot to do with the productivity of the mower and quality of cut. Also helps with to distribute clippings more evenly.
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Old 01-16-2010, 12:27 PM
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jkilov jkilov is offline
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Like the guys said: higher blade tip speed allows acceptable cut quality and discharge at faster mower speed - equals better productivity. BTS is by no means a substitute for deck design.

Drawbacks: louder deck noise and poor fuel economy.
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Old 01-16-2010, 12:37 PM
Lordtimothy Lordtimothy is offline
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Blade tip speed is also a safety thing. ANSI standards require all machines that are certified to be below a certain point. You also have European standards ect ect to follow if you want to sell in other countries.

Faster you spin the blades more chance of something going horribly wrong so that apparently was decided to be the safety threshold. Not just blades and items coming apart from the deck it also affect rocks and any item you hit.

More I think about it there maybe a point of diminishing returns on how fast the blade turns. But all in all one thing you can be certain of it is a safety thing. That is why it is limited to 18-19k. Protects the companies from lawsuits due to the industry accepted standard.

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Old 01-16-2010, 01:08 PM
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Valk Valk is offline
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Then there are certain conditions that require a lower BTS to perform the given task optimally. I've found leaf mulching to sometimes work best at reduced BTS/throttle...and also in certain moist grass situations.

There's only so many variables we have control over (clean deck - blade choice/sharpness - discharging/mulching/bagging - etc) and engine speed->effecting BTS is yet another.

As usual, your mileage WILL vary...but you'll never know if reduced BTS will be a benefit unless actually powering down & trying it.
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Some folks are so contrary that if they fell into a river,
they'd insist on floating upstream.
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Old 01-16-2010, 02:05 PM
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mowerbrad mowerbrad is offline
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Like others have said, the faster blade tip speed, the faster the unit can mow (ground speed wise). But you also need to look at the deck. Certain decks have higher capacities and can handle larger amounts of clippings than others can. Decks are designed with a blade tip speed in mind, so the tip speed and the deck are matched together to have the best performance out of the deck.
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Old 01-16-2010, 02:30 PM
MikeKle MikeKle is offline
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Also not mentioned is the faster the blades are turning, the more suction/vacuum that is created, and that means less non-cut grass left behind.
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Old 01-16-2010, 06:51 PM
Kutz Lawns Kutz Lawns is offline
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You can also put smaller pullies on the spindles for a higher tip speed!

OH NO, not again!
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