| 摘要 |
For quiet and efficient operation of a propeller (13) driven aircraft, a prime mover (29) is mounted rigidly to a shroud (26) which fits closely around the propeller (13), the propeller (13) is mounted rigidly to the prime mover (29) and the shroud (26) is provided with resilient mounting means (25) for making fast in its operative position the power unit so formed and for isolating vibrations of the prime mover (29) in the power unit.
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