Data memorandum on the Phantom II engine with balanced crankshafts for use in tanks.
| Identifier | ExFiles\Box 11\1\ 01-page18 | |
| Date | 24th August 1933 | |
| E. {Mr Elliott - Chief Engineer} From Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} 10/MA.24.8.33. 40/50 ENGINES IN TANKS. Replying to your E.8/HP.23.8.33., we send you the following data for the latest type P.II engines with balanced crankshafts. (1) (a) Polar moment of inertia of flywheel and clutch 1.3 slugs ft.² (b) Polar moment of inertia of crankshaft 480 lbs. in.² (c) Polar moment of inertia of Big Ends and pistons 210 lbs. in.² (d) Polar moment of inertia of crank damper hub 20 lbs. in.² (3) Shaft stiffness 90,000 lbs. ft. per radian. (4) Natural frequency of engine alone 200 per sec. or 3 per rev. at 4000 R.P.M. Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} [Handwritten]: V7012 | ||
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).