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).
Diesel engine performance, hydrogenated fuel, and a comparative analysis of engine cooling system drag.
| Identifier | ExFiles\Box 173\2\ img209 | |
| Date | 12th March 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KW.12.3.34. Their main interest lay in an exactly similar unit running as a diesel where they were getting similar M.E.P's up to 2000 R.P.M. with max pressures not exceeding 1000 lbs/sq.in. and 1" Hg. boost, with consumptions down to .45 pints. They exhaust valves here gave them little or no trouble. They have a high opinion of the Junkers opposed piston unit which they think fundamentally should be slightly better than they can do. They still insist that the latest hydrogenated fuel has an octane valve of 92.5 and a flash point of 125. Say it has been on the secret list and that is why we didn't get any from Aldrin. Shall try again when I get to New York. I find from the Air Attache that some was sent off in July last, perhaps it went straight to the Ministry as I heard nothing of it. DRAG OF GLYCOL RADS. They have no definite comparisons of a water cooled against a Glycol rad. but have compared the latest Conqueror installation with oil cooler with the latest single row radial with the best known cowl, also the water cooled installation with no radiator and the water cooled in the wing sections with a shaft drive. These were all done in the wind tunnel. They did a further test with the latest double row radial and best cowling and this came out at practically the same drag figure as the water cooled with Glycol rad. Nacelle Set-up. H.P. required to drive at 200 M.P.H. for a 600-HP.Engine. % of Total Engine H.P. absorbed by propelling itself & Cooling installation. 1. Single row radial, Best N.A.A.C. Cowl. 63 H.P. 10-1/2% 2. Conqueror with Oil Rad. & Glycol Rad. 42 H.P. 6.3% (true also for double row radial) 3. As 2 but with no rad. 31 H.P. 5.15% 4. Water-cooled engine in wing. No rad. shaft drive to prop. 12 H.P. 2% | ||