JP-7, The Fuel That Powered the Blackbirds

The Blackbird uses a vintage 1970 military specification called MIL-T 38219, or Jet Propellant 7. Normally known as JP-7.

JP7 Technical Specifications

Turbine Fuel, Low Volatility, JP-7, commonly known as JP-7, was referred to as Jet Propellant 7, to MIL-DTL-38219[2] is a specific jet fuel that was developed for the United States Air Force (USAF), for use in its supersonic military aircraft that required a jet fuel with a high flash point, and high thermal stability.

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JP-7 Properties

Melting point: −30 °C (−22 °F)

Boiling point (at 1 standard atmosphere (100 kPa)): 282–288 °C (540–550 °F)

Density (at 15 °C (59 °F)): 779–806 kg/m³

Vapor pressure (at 300 °F (149 °C)): 155 millimetres of mercury (3.00 psi) (20.7 kPa)

Flashpoint: 60 °C (140 °F)

Net heat of combustion: min. 43.5 megajoules per kilogram (5.48 kWh/lb)