Outside he could hear the drone of a powerful motor.

And all of that is obscured by a powerful motor.

Look for one with the most powerful motor among models in the same price range.

Even models with powerful motors use about the same amount of energy as a 100-watt light bulb.

They also require more powerful motors due to their weight.

It was a deep, powerful motor of a car driving fast.

It takes a powerful motor to spin a cold engine.

It was built to carry two, and had a very powerful motor.

This design allows larger and more powerful motors to be used.

X21 is the other original series, and built as ten two car sets, with a less powerful motor.