List of camshaft part numbers and prices for Kestrel, Buzzard, and Goshawk engines.
| Identifier | ExFiles\Box 174\5\ img233 | |
| Date | 27th June 1921 guessed | |
| Camshafts. Kestrel(Aero Engine) Engines. Kestrel(Aero Engine) VI, VIIa, IX, XI, XII, XVI. Camshafts. R.H. Trac. Part No. 67540 [...] Camshaft Issue No. 1 [...] Price £25. E2263 [...] Price £25. Buzzard(Aero Engine) Engines. Part No. 69623 R.H. Trac. " " 69624 L.H. Trac. Price each £26.10.0d (Stamp: Interchangeable) Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) Engines. Part No. 69470 R.H. Trac. " " 69471 L.H. Trac. " " 69472 " " 69473 | ||
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).