Design decisions on components for the Buzzard model, armoured cars, and other vehicles.
| Identifier | ExFiles\Box 183\M22\ img130 | |
| Date | 1st October 1920 | |
| Contd. -4 E1/GS.10.20. and displacements per ton mile are. Mr. Hives should send to West Wittering(Henry Royce's home town) blue prints of charts showing power required to climb hills of various gradients. Mr. Royce thought that the crown wheel on our new axles should not be less than 13" in diameter for the larger ratios. The present Buzzard(Aero Engine) axle should be allowed to go on as started, but it should be kept in mind that we want 1" on the big wheel for covered cars. BUZZARD(Aero Engine) FRONT AXLE. X.4045/6. This should be as 40/50 H.P. for wire wheels, not Michelin with the exception that the front springs may be wider, as specified on the LeC. drawing dealing with this part. BUZZARD(Aero Engine) GEARBOX. X.3826. Regarding the question of having four speeds. Mr. Royce thinks we should go ahead and make a three speed on the lines of the Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) model and do the four speed later on when we have time. The first speed on the three speed box should be made low enough for an emergency gear to enable the car to climb out of awkward places, and with best back axle ratios carry the full load up 1 in 4 = 25% grade. BUZZARD(Aero Engine) CHASSIS. X.3786. The position of the Buzzard(Aero Engine) chassis as regards progress was gone into, and Mr. Royce said he thought Mr. Day should deal with the whole of the rear of the chassis, the front axle, and front springs, and the steering box and dash, the remainder had been or was being dealt with at West Wittering(Henry Royce's home town) ARMOURED CARS. X.4195. Impulse Starter Versus Hand Magneto. Regarding the above point Mr. Royce stated that the War Department could have whichever they liked, but that he advised the hand magneto. He thought our policy should be to demonstrate starting by each method to them on a car, and then placing our advice before them, let them decide. The hand magneto is what we have used for a long time on aero work, and it does not interfere with the reliability of the main magneto. It was decided that Mr. Royce's advice should in all cases be definitely communicated to the persons responsible for departure from our standard practice. AIR PUMP FOR TYRES. X.4197. The question of fitting an efficient tyre pump is somewhat complicated by the compact conditions for the Contd. | ||
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).