I already know the answer to this easy question. Just curious what people know on the internet. A 36 volt DC electric motor, model P66SR274 is rated for 1865 watts (2.5 HP) at 2000 RPM, and its output shaft is to be direct coupled to a shaft that is 25mm in diameter. The power supply is 3X, 12 volt car batteries wired in series that are brand new and fully charged. The 25mm shaft will have a rope going through a drilled hole in the shaft and knotted. This rope will lift a mass X as shown in the list: 80Kg 100Kg 135Kg After the testing is done with the electric motor, a Honda GX100 gas engine with clutch to engage at 3600 RPM is rated for 2100 watts (2.8 HP) at 3600 RPM and will be geared down to 1800 RPM to a pulley that is attached to the 25mm diameter shaft and the gas engine will be pulling up the same mass X as the electric motor did. Now the question is: Which prime mover will stall?