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Thread: Piasecki X-49 SpeedHawk compound helicopter - GIF

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    Supporting Member Altair's Avatar
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    Piasecki X-49 SpeedHawk compound helicopter - GIF


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    Supporting Member Frank S's Avatar
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    Not to mention doing away with an entire rt angle gear box as well.
    Theoretically there should ultimately be a significant increase in range per 100lb. fuel consumed

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