For Earth launch, engines require a thrust to weight ratio of more than one.

Even larger engines might require the use of a barring engine.

The engines require immediate replacement, and she will not be available throughout 2012.

It was expected that the new engine would require a 2,000 lb weight increase and cost 14 mph in top speed.

The engines control only the speed, and require relatively low power compared to the transported weight.

Upon her return, the ship's engines required repairs that lasted until 13 March.

Unfortunately the engine is beyond repair and requires a replacement.

An engine requires large amounts of air when operating at high speeds.

The engine requires a new boiler before it can steam again.

For, as he points out, the engine of modern capitalism, the work contract, requires equality before the law.