Winston wrote:

Pete C. wrote:
Winston wrote:

(...)

She should be able to get 10 A at 120 V out of a 14 AWG
extension cord measuring 75' in length. So that's 1200 W
or 1.6 HP. My little 30cc brush cutter does an acceptable
job with only 1.0 HP, so it isn't unreasonable to ask for
an A.C. brush cutter, is it?

Factor in voltage drop and motor efficiency and you'll be lucky to get
even close to 1 real HP.

Electric motors generally exceed 80% efficiency.
Gas motors rarely exceed 25% efficiency.

Figure less than 6 V drop for a 75 foot extension cord
at 15A and less than 4 V drop at 10A.
120 - 6 = 114 V. That'd work great!

--Winston

Good electric motors exceed 80% efficiency, cheap electric motors as
used in electric trimmers - not even close.

Gas motors may not be very efficient fuel wise, but a 1hp gas motor
outputs 1hp as long as it has fuel.