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The first two are twin-engine and the last three single-engine machines. Opinions differ as to the relative advantages of the twin and single-engine type. The first and running costs of the single engine are lower, but the twin has greater power and carrying capacity, while most pilots prefer to have a surplus of power over and above that required for normal flight.
All these things Sapper Duffy saw out of the tail of his eye, and without stopping or slacking the pace of his digging. He fell unconsciously to timing his movements to those of the other man, and for a time the machine became a twin-engine working beat for beat thrust, stoop, straighten, heave; thrust, stoop, straighten, heave.
In the afternoon, the boys somewhat reluctantly got into what they referred to as "shore-going clothes." These consisted of slacks, sport shirts, light casual jackets, and loafers. Steve had a bag packed. They got into his car, a late-model convertible, and headed for Cambridge. The plane, a small twin-engine craft, was late coming from Norfolk.
On the other hand, where extra power is not required, the twin-engine is not safer than the single-engine machine; no existing twin-engine commercial aeroplane can maintain its height and land safely with only one engine running.
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