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).
Page concluding against the use of the Lentz hydraulic gear due to its operational disadvantages.
| Identifier | ExFiles\Box 136\4\ scan0012 | |
| Date | 15th January 1912 guessed | |
| (3) throw pumps for the purpose of obtaining the speed changes, that is to say, the Lentz gear gives an absolutely steady torque, and this I consider to be of great importance, and a result which has not been obtained by any other hydraulic gear that I am aware of. I do not think the gear is really of any use, owing to the disadvantages above mentioned, the chief of which are undoubtedly the difficulty of obtaining and keeping a really good oil joint between the vanes and the casings, and of keeping the pumps etc free from air. I do not think we should go further into the matter. T B Barrington | ||