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).
Technical memorandum detailing tests and proposed modifications for the Goshawk 11 engine components.
| Identifier | ExFiles\Box 180\M1\1\ img063 | |
| Date | 9th September 1921 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Ds. c. to BY.{R.W. Bailey - Chief Engineer} c. to RP. c. to WGT. ORIGINAL X4219 GOSHAWK 11. Oil Pump. We have fitted to a Goshawk 11, Oil Pump & Relief Valve off a 40/50 H.P. Oil Pump. We found that we could, with-out much trouble adapt the cover from a 40/50 pump containing the Relief Valve to the Goshawk Pump. We have proved with this pump, that we can definitely overcome the noise we get from the engine gears due to excess oil when the engine is started up cold. We recommend that we adopt this scheme of relief valve for the Goshawk 11, and to take an oil supply from the main pressure to the Wheelcase. All our records show that the oil pump on the 40/50 H.P. has been very reliable and very efficient. Spring Drive. We have carried out a number of further tests with the Spring Drive on the Goshawk but we have not been successful in being able to overcome the crankshaft periods at all speeds with the present type of friction flywheel. From the results of our further tests we believe that when we have over-come the period at 50 M.P.H. it has been due to the flywheel being locked solid to the crankshaft and therefore considerably reducing the speed at which the period occurred. We have fitted to the Goshawk Car a temporary friction flywheel which operates in the same way as that on the 40/50 H.P. that is, the friction flywheel is a separate unit from the spring drive. We have proved that we can, with this, overcome crankshaft periods effectively without introducing other faults. We recommend that a scheme like this should be got out for the engine. Universal Joint. We have tested the universal joint with the Vent scheme but we find on the Test Bench that we still get the oil leaking out until the joint is dry. Noise from Gear Box. We find that removing the Hyatt Bearing and fixing a plain bush appears to improve it. The gear box is still not satisfactory as regards noise. We are now removing the reverse pinion to prove that is not the cause. Hs.{Lord Ernest Hives - Chair} | ||