From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Table comparing the characteristics of various 100 octane aircraft engine fuels.
| Identifier | ExFiles\Box 150\1\ scan0216 | |
| Date | 30th January 1936 guessed | |
| Table III Characteristics of 100 Octane Aircraft Engine Fuels Requirements for Grade 100* U.S. Navy Requirements British Air Ministry Requirements Pratt & Whitney Wright Aero. New 100 Octane Fuel (40% Isopropyl Ether in Aviation Gasoline) 100 Octane Fuel (45% Iso-Octane in Aviation Gasoline) Typical Aviation Gasoline Typical Inspection Commercial 100 Octane Aviation Gasoline Octane Number, Army Method 100 - - - - 100 100 74 (ASTM) 100 Ml. Tetraethyl Lead per U.S. gal. 3 max. 3.27 max. 3.33 max. - - 3 3 0 3 Copper Dish Corrosion Test Must pass Must pass - Must pass Must pass Passes Passes Passes Passes Gum after Accelerated Ageing test, mgs./100 ml. 10 max. 10 max. 20 max. 10 max. 10 max. 9.8 5.0 2.0 2.0 Sulfur per cent 0.10 * 0.10 * 0.15 * 0.10 * 0.10 * 0.02 0.02 0.026 0.02 Distillation Test Percent condensed at 150°F - - - 5 min. - 8.5 5.0 9.0 9.0 Percent evaporated at 158°F - - - 10 * - 22.0 8.0 19.0 15.0 Percent condensed at 167°F 10 min. 10 min. 10 min. - 10 min. 47.5 14.0 32.0 21.5 Percent evaporated at 212°F 50 min. - 50 min. - 50 min. 90.0 64.0 83.5 68.0 Percent condensed at 212°F - 50 min. - - - - - 82.5 - Percent evaporated at 275°F 90 min. - - - 90 min. 99.0 - - - Percent condensed at 275°F - 90 min. - - - - - 98.0 - Percent evaporated at 302°F - - 90 min. - - - - - - Sum of 10 & 50% Evap. Points °F 307 min. - - - - 319 364 353 354 Percent Residue 2 max. 2 max. 2 max. 2 max. 2 max. 1.0 1.0 1.0 1.0 Reid Vapor Pres. lbs./sq.in. 7 max. 7 max. 7 max. 7 max. 7 max. 6.0 6.6 7.0 6.7 Freezing Point, °F. {Mr Friese} -76 max. -76 max. -76 max. -76 max. -76 max. below -148 below -148 below -76 below -76 Water Tolerance: (ml. change in volume of 20 ml. aqueous layer after shaking with 80 ml. gasoline at 75°F. {Mr Friese} ) 2 max. - - - - 0 0 0 - Product of High Value of Heat of Combustion (B.T.U./lb.) by specific gravity 13,700 - - - - 14,310 14,350 14,400 - Gravity °A.P.I. - - - - - 64 70 70.0 70.8 High Heat of Combus. BTU/lb. - - - - - 19,360 20,820 21,000 - Low Heat of Combus. BTU/lb. - - - - - 17,990 19,410 19,580 - Low Heat of Combustion plus Latent Heat of Vaporization: BTU/Lb. - - - - - 18,120 19,550 19,720 - BTU/Gallon - - - - - 109,400 114,500 115,100 - Percentage loss in Calorific Value as compared with Typical Avia.Gaso. On pound basis - - - - - 8.1 0.9 0 0 On gallon basis - - - - - 5.0 0.5 0 0 * - Compare U.S. Army Specification No. 2-92 for Aircraft Engine Fuel, Grade 100. | ||