The disappointing bump test results for Firths springs on the Goshawk 11.
| Identifier | ExFiles\Box 52\2\ Scan026 | |
| Date | 17th January 1922 | |
| X4429 To H. {Arthur M. Hanbury - Head Complaints} from Hs. {Lord Ernest Hives - Chair} c. to CJ. c. to R. {Sir Henry Royce} c. to De. c. to BY. {R.W. Bailey - Chief Engineer} c. to EP. {G. Eric Platford - Chief Quality Engineer} c. to Wor. {Arthur Wormald - General Works Manager} c. to Wd. {Mr Wood / Mr Whitehead} Hs {Lord Ernest Hives - Chair} 1/LG17.1.22. FIRTHS SPRINGS FOR GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. X2628 (crossed out) X4429 X4219 Under pressure from us, Messrs. Firths have recently supplied us with a number of top leaves for the front and rear springs of Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. We have tested these springs on the Bump test - the results are disappointing. So far we have broken four top leaves - they have run for - 15 1/4 hours. 11 1/4 " 8 1/2 " 2 1/4 " The average life of the Woodhead spring is approx. 12 1/2 hours - it varies between 9 1/4 and 16 hours. It will be seen that we are much worse off with Firths springs. BY. {R.W. Bailey - Chief Engineer} is taking up the question of material and treatment with the makers. Hs. {Lord Ernest Hives - Chair} | ||
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).