Specifications and load calculations for springs fitted to a centre point radiator mounting.
| Identifier | ExFiles\Box 18\3\ Scan097 | |
| Date | 6th May 1930 | |
| For Files. x 7960 HB {C. E. Harcombe} /Rn. {Mr Robinson} 6.5.30. X.7250 X.7960 X.7518. CENTRE POINT RADIATOR MOUNTING: Springs actually fitted to 1-WJ and 80-WJ. No. of coils (Total) 7.5 Wire. 12 S.W.G. Mean rad. .292 Free length 1.350 Choc length .780 Rating 13,000 x .000117 21 ---------------- = ---- = 13½ Lbs/1" 6.5 x .0247 .160 Normal load = set up x rating. = .220 x 13½ = 29.5 lbs. 7,700 lbs/sq.in. Max. load = choc a bloc = .570 x 13½ = 76 lbs. = 20,000 lbs/sq.in. stress. Washers fitted to Hs. {Lord Ernest Hives - Chair} 290. Rn. {Mr Robinson} | ||
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).