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).
Specification and performance details for a Clayton S.2.RA. car heater.
| Identifier | ExFiles\Box 137\1\ scan0213 | |
| Date | 15th December 1936 | |
| 15th December, 1936. CLAYTON S.2.RA. CAR HEATER DETAILS. CLAYTON S.2.RA. Trial No. 635 Overall length 4" Overall height 7 1/2" Overall width 7 1/2" Element length 2.3/8" Element height 6.1/2" Element width 6.1/2" Dimensions of motor 2.1/4" dia. 3.7/8" overcasing 4.5/8" overall Fan diameter. 5" Weight of Heater 6 lbs. 9 oz. Weight of Element 2 lbs. 0 3/4 ozs. Weight of casings 2 lbs. 9 3/4 ozs. Weight of motor 1 lb. 14 1/2 ozs. Fitting Parts (less hose) 1 lb. Volts 12 Watts 11.0 Water flow. galls per min. 2.0 Water pressure inches of water 21.7 B.T.Us. per Hour at 120° F.{Mr Friese} T.D. 4540 Air flow cub. ft. per min. 66 MOTOR PERFORMANCE WITH STANDARD 20° ANGLE BUS HEATER FAN R.P.M. 1210 Equiv. B.H.P. .00385 Watts taken 18.6 Motor efficiency % 15.45% | ||