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).
Power analysis graph for a B80 No 1 engine unit under various exhaust, silencer, and fan configurations.
| Identifier | ExFiles\Box 109\1\ scan0138 | |
| Date | 14th July 1939 guessed | |
| POWER ANALYSIS OF B80 No 1 UNIT AS REMOVED FROM 30 G VII (S 97) CARB. DUPLEX STROMBERG ADJUSTABLE JETS CAMSHAFT FB 4105 TIMING WITH IO: 1.5° PTDC EO: 42° BRDC .030 CLEARANCE IC: 39° PBDC EC: 3° BTDC ORIGINAL TYPE CYL. HEAD 6.3:1 C.R. EXS 925 IND'N SYSTEM 1.6 BORE MANIFOLD ① OPEN EXHAUST ② WITH BUICK AIR SILENCER ③ WITH FAN STD 6" BLADES + ② ④ WITH ADAPTED BUICK EXHAUST ② + ③ SILENCER TO SUIT 30 G VII ⑤ AS ④ BUT CORRECTED TO 50°C NOT 15°C B.H.P. M.E.P. LBS R.P.M. | ||