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).
Test report comparing the durability and leak performance of various radiator designs under bumping tests.
| Identifier | ExFiles\Box 78\3\ scan0111 | |
| Date | 30th April 1915 guessed | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}2/L22415. Bumping tests on various Radiators all on 2" alternate bumps at 105 revs. per minute. No. | Radiator. | Suspension. | Commenced to leak after running hrs. mins. | Test stopped after running hrs. mins. | Number of leaks at endof test ---|---|---|---|---|--- 1. | 22" X 5" Orme Evans crinkled tube. | Plates back and front on trunnion with bearing pin E.3316 bolted to frame. | 2 - 10 | 8 - 10 | 6 2. | 20" X 5" Orme Evans crinkled tube. | Ball well underneath (1½") | 11 - 35 | 11 - 35 | 1 3. | 20" X 5" Orme Evans square honeycomb not bonded to tank. | Same as No.1 | No leaks. | 15 - 0 | 0 4. | 20" X 5" Orme Evans square honeycomb bonded to tank | Same as No.2 | No leaks | 20 - 0 | 0 5. | 20" X 4¾" Marston Zimmerman round tube. | Same as No.2 | No leaks. | 30 - 0 | 0 | ||