Re: (ET) ICE rpm

["RJ Kanary" <rjkanary nauticom net>]

       Not always. The government's continued efforts to keep people from
killing themselves, {Or their neighbors.} have resulted in new safety
standards that specify blade tip speed, instead of RPM.
       The Feet Per Second spec allows that a larger diameter blade has a
higher blade tip speed than a smaller one, so the engine used in a 22 inch
lawn mower has a lower governed speed than an 18 inch mower.
       At the same time, the smaller blades used in a tractor mounted mower
deck are allowed an even higher RPM than those found in a walk behind 
mower.

----- Original Message ----- 
From: "neil" <wombat dssinternet net>
To: <elec-trak cosmos phy tufts edu>
Sent: Monday, June 07, 2004 9:44 AM
Subject: (ET) ICE rpm


> IIRC, the normal speed for the direct drive rotaries is about 3600 RPM.
> I've got a rotary tach, could probably check the neighbors mower if 
> needed
>
> Hump, I've got the drive motor from whatever model I just stripped, it's
> maye 5" dia and 15" long, can check closer.  Don't know what is in other
> one that's next in line.  Dunno what whould be reasonable price, maybe
> $25 plus shipping.
>
> wombat
>
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