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).
Method of construction for a car heater, detailing its components and operation.
| Identifier | ExFiles\Box 147\2\ scan0231 | |
| Date | 20th February 1940 guessed | |
| COPY. R.R. 2. CAR HEATER. METHOD OF CONSTRUCTION. In order to simplify construction of car heaters we utilize one fan only of the centrifugal type (impellor) with either radial or curved blades for delivering air to the interior of the car; said air being either picked up from inside the car as led by ducting from outside the vehicle, the inlet duct being attached at some convenient point on the body or chassis. The motor driving the fan is fixed to the engine side of the dashboard, if the heater is fixed on the dash, or is fixed externally to the heater matrix, if the heater is mounted elsewhere; drive is either direct from the motor or through a flexible rubber or metallic coupling. In order to utilize the fan to it's full capacity internal baffling is arranged to lead air through the matrix to the centre of the impellor, and this ducting is arranged to have a projecting baffle on one side arranged to cover up a proportionate amount of the outlet orifices. This baffle is mounted on a spindle passing through the centre of the matrix, or in any other convenient manner, and is arranged to rotate, allowing the projecting baffle to cut off at will the air to the car interior or the air to the defroster ducts, or any desired combination of air flows to car interior or defrosters. Control of this rotating baffle may be direct from the heater, or by means of a flexible drive or cable with control on the dashboard. The spindle is mounted in plain or ball bearings as may be desired. Defrosting is accomplished by ducting the air from a proportionate part of the heater outlet orofice and leading to defroster ducts in the scuttle rail; these ducts being arranged to throw the air over the screen to give maximum visibility. It is not considered that this object is best obtained by symmetrical ducting. | ||