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These fuel grade kerosenes meet specifications for smoke points and freeze points. In the mid-20th century, kerosene or "TVO" (Tractor Vaporising Oil) was used as a cheap fuel for tractors. The engine would start on gasoline, then switch over to kerosene once the engine warmed up. A "heat valve" on the manifold would route the exhaust gases around the intake pipe, heating the kerosene to the point where it can be ignited by an electric spark.
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On paper, any petroleum can produce some RP-1 with enough processing. In practice, the fuel is sourced from a small number of oil fields with high-quality base stock. This, coupled with small demand in a niche market compared to other petroleum users, drives the price. Military specifications of RP-1 are covered in MIL-R-25576, and the chemical and physical properties of RP-1 are described in NISTIR 6646. Soviet and Russian rocket-grade kerosenes are very similar to RP-1 and are designated T-1 and RG-1.
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The pamphlet outlined the numerous uses for kerosene oils and noted that Gesner was the company's chief chemist, hired on for a "moderate salary." On June 27, 1854, Gesner obtained U.S patents 11,203, 11,204, and 11,205 for "Improvement in kerosene burning fluids," but he transferred patent rights to the North American Kerosene Company. In the patents, Gesner described three distinct types of kerosene, which he labelled kerosenes A, B and C. Kerosene A was the most volatile fraction, known today as gasoline. Kerosene B was slightly less volatile and was intended mainly for mixing with the other grades.
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These fuel grade kerosenes meet specifications for smoke points and freeze points. The combustion reaction can be approximated as follows, with the molecular formula C12H26 (dodecane): 2 C12H26(l) + 37 O2(g) → 24 CO2(g) \+ 26 H2O(g); ∆H˚ = -7513 kJ In the initial phase of liftoff, the Saturn V launch vehicle was powered by the reaction of liquid oxygen with RP-1. For the five 6.4 meganewton sea-level thrust F-1 rocket engines of the Saturn V, burning together, the reaction generated roughly 1.62 × 1011 watts (J/s) (162 gigawatt) or 217 million horsepower.
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