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).
Blueprint detailing a dropped front section for a J III exhaust system with clearance specifications.
| Identifier | ExFiles\Box 104\2\ scan0027 | |
| Date | 7th June 1932 guessed | |
| J III EXHAUST SYSTEM. HS{Lord Ernest Hives - Chair} 641 THIS LENGTH TO BE DROPPED TO GIVE A MIN: OF 3 3/8" CLCE FROM PIPE TO BRAKE LEVERS FRAME ROPES ETC: CLCE TO GROUND, EMPTY CAR NOT LESS THAN FIVE INCHES. 34" APPROX: NO FLANGE HERE. EXISTING SLIDING JOINT. DROPPED FRONT SECTION OF J III EXHAUST SYSTEM TO ENABLE RESONANCE CHAMBERS TO BE TRIED NEARER THE POWER UNIT. GROUND CLEARANCE IMMATERIAL EXCEPT THAT NORMAL POSITION THERE SHOULD BE NOT LESS THAN FIVE INS: BETWEEN PIPE & AND GROUND. | ||