The Bell XV-15 was an American tiltrotor VTOL aircraft. It was the second successful experimental tiltrotor aircraft and the first to demonstrate the concept's high speed performance relative to conventional helicopters.
Read more about Bell XV-15: Flight Testing, Specifications (XV-15)
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“His are the quiet steeps of dreamland,
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His ram’s bell rings ‘neath an arch of stars,
“Rest, rest, and rest again.””
—Walter De La Mare (1873–1956)