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).
Potential causes and solutions for intake noise in the 'Goshawk II' engine.
| Identifier | Morton\M1.1\ img092 | |
| Date | 27th October 1921 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} Copy to CJ. " " WOR.{Arthur Wormald - General Works Manager} " " BY.{R.W. Bailey - Chief Engineer} " " E.{Mr Elliott - Chief Engineer} " " DA.{Bernard Day - Chassis Design} " " EP.{G. Eric Platford - Chief Quality Engineer} " " HY.{Tom Haldenby - Plant Engineer} RE "GOSHAWK II". XLP219 X3481 It occurred to me that the noise of the intake might possibly be due to the whirling of the air within the cylinder during the descent of the pistons. To prove whether the noise emanates from the air actually in the cylinder, we suggest that you replace the gasket with a plate or gauze covering all over the cylinders, which is perforated, or cut away diametrically for half the bore, Of course not intended for giving power, but motor driven. A great difference between "Goshawk I" and "Goshawk II" is that "Goshawk I" valve being inclined the intake goes straight for the middle of the cylinder, whereas "Goshawk II" the valve being vertical at one side of the cylinder, the air descends quickly down that one side and forms a whirl, which may in some way result in an intermittent flow like the inside of a whistle. If, however, the noise is due to the velocity of the gas in the passage setting up some vibration, this might be considerably modified by drilling a hole on the opposite side to the passage near the sparking plug. Could you do this in the scrap head? I have, as you know, suggested you try many other things such as lengthening the air passage, altering the timing of the inlet, both of the opening and the closing. I am very anxious that we use great energy to get the shock dampers on. Care should be taken that every part of the engine and clutch should be accurately balanced, motoring round the engine at all speeds up to 3500 revs. on the chassis and putting (Contd.) | ||