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).
Letter from Autovac Mfg. Co. Ltd. detailing test results for Autovac and Venturi fittings for a Goshawk II engine.
| Identifier | ExFiles\Box 40\4\ Scan033 | |
| Date | 12th August 1921 | |
| Copy. The Autovac Mfg. Co.Ltd. Heaton Norris, Stockport. August 12th, 1921. SR/BC. Messrs Rolls Royce Ltd. Osmaston Road, D E R B Y. A.V. 31 Dear Sirs, Goshawk II. For the attention of Mr.Bailey. ------------------------- We have to-day despatched the Autovac and Venturi fitting for induction pipe as promised in our letter of the 12th ultimo. We have omitted to send the Non Return Valve fitting for the induction pipe as we find on further tests that the best results were obtained with the Non Return Valve assembled in the Autovac. Our tests were conducted upon a stationary engine coupled to water brake and developing full load at 900 revs. with throttle fully opened. The depression in the induction pipe showed ¼ inch of mercury and the static lift was 15" of petrol. We used ¼" bore tubing on the test. When testing the apparatus without the Non Return Valve we could only lift 15" of petrol. After fitting the Non Return Valve to the apparatus the vacuum gauge on same showed 2" and we lifted the petrol 2'6" through 20 ft tubing and delivered 7½ galls. per hour also we lifted the petrol 3ft 4" through 12 ft tubing and delivered 5 galls per hour. The venturi assembled in the induction pipe without the Non Return Valve shows 1¾" vacuum and the lift of petrol was 1'9" through 2 ft tubing and this delivered at the rate of 3 galls per hour, the static lift was 2'3". The venturi fitted with Non Return Valve showed 3¼" of vacuum and lifted petrol 3'6" through 12 ft tubing and delivered 6 galls. per hour. | ||