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).
Design specifications for a mobile winch, detailing power, operational angles, braking, and transport requirements.
| Identifier | ExFiles\Box 175\2\ img070 | |
| Date | 17th February 1941 guessed | |
| Power. 5. The winch is to give a maximum pull of 1000 pounds at a maximum speed of 75 m.p.h. The design should if possible allow for the maximum speed being increased to 85 m.p.h. without extensive reconstruction. There would be a corresponding reduction in the pull. 6. For quick acceleration from the start, a higher maximum pull should be given if possible and should be developed from the standing start. But the power should be delivered continuously, ie. without changing crash type gear. Design. 7. The winch should be designed to allow a range of angles to the cable; a vertical range from 0° to 90°, and a sideways range of 45° each side is suggested. 8. The drum should have a brake to slow it down. Such brakes have been found to be liable to snatch, and a spring assisting its application has been found to prevent this. The brake should have a ratchet so that it can be left on. 9. It may be desirable to brake the cable lightly at the lead-in so that it does not overrun loosely on to the drum. 10. A mechanism to lay the cable on the drum is needed. Transport. 11. The winch is to be mobile. It may be fixed on a standard R.A.F. trailer. | ||