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).
Test report from Autovac Manufacturing Company comparing venturi performance with and without exhaust coupling.
| Identifier | ExFiles\Box 40\4\ Scan031 | |
| Date | 15th August 1921 guessed | |
| THE AUTOVAC MANUFACTURING COMPANY Ltd. Stockport. No. VENTURI COUPLED WITH EXHAUST. Engine Speed. 900 Revs. Full Load. Depression on Induction pipe. 1/2" of Mercury. AUTOVAC WORKING. STATIC. 3 1/2" Vacuum. 5 1/2" Vacuum. The Autovac functioned 5 times in 28 seconds. = 8 Gallons per hour delivery. VENTURI WITHOUT EXHAUST. Engine Speed. 900 Revs. Full load. Depression on Induction pipe 1/2" of Mercury. AUTOVAC WORKING. STATIC. 3" of Vacuum. 4 1/2" The Autovac functioned once in 11 seconds. = 4 Gallons per hour delivery. --------------------- | ||