Re: (ET) Inverter for Electric Chainsaw

["David Roden (Akron OH USA)" <roden ald net>]

On 13 Apr 2003 at 21:34, Herb Crary wrote:

> I have an electric chainsaw rated at 2.5 hp;
> the rating plate says 120v 10.5 amps. This must be one of those bogus 
> rating
> systems, because this is only 1260 watts or about 1.7 hp (746 watts = 1 
> hp).

Bogus it is indeed.  Maybe that's the peak hp the motor can sustain for 
about 500 milliseconds, but you can't do any real work with it; those 
horses 
tire out too fast.  <g>  

I don't think there's any law regulating what manufacturers can claim for 
motor output, so for a lot of consumer products they just just plain make 
things up.  

GE did it too, with the bizarre claims for the E-15 that "peak torque 
exceeds 15hp," as if torque were measured in horsepower.  I suppose they 
were trying to claim that the peak torque was higher than that of a 15hp 
gas 
tractor, but that's not what they said.


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea 36vdc
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