Comparison of piston distances from Top Dead Centre (T.D.C.) for Goshawk 11 and Swashplate pistons at various crank angles.
| Identifier | ExFiles\Box 77\3\ scan0272 | |
| Date | 19th July 1923 | |
| X4224 DISTANCE FROM T.D.C. POSITION OF GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. AND SWASH PISTONS FOR VARIOUS CRANK ANGLES. Handwritten: X4224 X.4369 Crank Angle. Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. Stroke 4 1/2" Swashplate. Stroke 4 1/8" 10º .044" .031" 20º .173" .125" 30º .382" .277" 40º .659" .482" 50º .980" + .737" 60º 1.366" + 1.032" 70º 1.767" + 1.358" 80º 2.173" + 1.705" 90º 2.575" 2.063" 100º 2.95" + 2.421" 110º 3.3" + 2.768" 120º 3.615" + 3.094" 130º 3.88" + 3.389" 140º 4.105" 3.644" 150º 4.278" 3.849" 160º 4.401" 4.001" 170º 4.475" 4.095" 180º 4.5" 4.125" + Denotes correct to two decimal places only. Hs {Lord Ernest Hives - Chair} /Rn. {Mr Robinson} | ||
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).