Acoustics Vibration Signal Processing August 2011 Newsletter Republic XF-84H Aircraft Sound & Vibration prototypes, but the aircraft never went into by Tom Irvine production. The XF-84H was from a modified F84F airframe with a 5,850 hp Allison Figure 1. XF-84H Prototype turboprop engine. The T40 was a pair of T38 engines inside a common case. Introduction The propellers had variable pitch for thrust control. The U.S. Navy had a short-lived requirement in the 1950s for a carrier fighter that could take off under The XF-84H was also the airplane to carry a its own power, without catapult assistance. ram air turbine, which automatically deployed from a compartment in the dorsal fin and pinwheeled in Note that the turbojet aircraft of the time were the airstream to provide extra electrical and underpowered and had high fuel consumption hydraulic power. rates. Thus there was interest in a turboprop aircraft as an alternative. Supersonic Blade Tips The USAF Wright Air Development Center took Note that standard propellers have subsonic blade over the development of the prototype after the US tip speeds. But the XF-84H had supersonic Navy abandoned the project. The UASF built two propellers, which had a tip velocity of 901 mph or Mach 1.18, even when the aircraft was idling on
Acoustics Vibration Signal Processing August 2011 Newsletter Republic XF-84H Aircraft Sound & Vibration by Tom Irvine Figure 1. XF-84H Prototype Introduction The U.S. Navy had a short-lived requirement in the 1950s for a carrier fighter that could take off under its own power, without catapult assistance. Note that the turbojet aircraft of the time were underpowered and had high fuel consumption rates. Thus there was interest in a turboprop aircraft as an alternative. The USAF Wright Air Development Center took over the development of the prototype after the US Navy abandoned the project. The UASF built two prototypes, but the aircraft never went into production. The XF-84H was from a modified F84F airframe with a 5,850 hp Allison turboprop engine. The T40 was a pair of T38 engines inside a common case. The propellers had variable pitch for thrust control. The XF-84H was also the airplane to carry a ram air turbine, which automatically deployed from a compartment in the dorsal fin and pinwheeled in the airstream to provide extra electrical and hydraulic power. Supersonic Blade Tips Note that standard propellers have subsonic blade tip speeds. But the XF-84H had supersonic propellers, which had a tip velocity of 901 mph or Mach 1.18, even when the aircraft was idling on