H-15
In September 1948, Bell was selected to develop the Bell 54 for the Air Force as the XH-15. This used a scaled-up Model 47 rotor powered by a 550 hp P&W R-1340 engine. Neither the H-12 nor the H-15 were produced in large numbers.
The Kellett H-15 was an experimental helicopter that first flew in 1954. The rotor was driven by Reaction Motors XLR-32 rocket engines on the tips.
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