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).
Technical document detailing the method of construction for a car heater.
| Identifier | ExFiles\Box 147\2\ scan0229 | |
| Date | 20th February 1940 guessed | |
| R-R 2 - CAR HEATER. METHOD OF CONSTRUCTION. In order to simplify construction of car heaters we utilise 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 or, 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 internally 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 utlise the fan to its full capacity internal baffling is arranged to lead air through the matrix to the centre of the impeller, 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 orifice, 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. Alternatively no duct at all need be employed, the air being lead by means of flexible tubes to its inlet connections fixed to the scuttle rail, This is then arranged to allow the air to flow out - continued - | ||