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Aviation History
1954
1954 - 1073.PDF
16 APRIL 1954 FLIGHT (Advertisement) 15 ELECTRICALLY- HEATED RUBBER MATS PREVENT ICE FORMING Mew Thermal Anticing System by Dunlop Latest development by Dunlop in the important field of ice-prevention in aircraft is a thermal anticing system on the electric blanket principle. Suitable for all operating conditions the system consists of electrical heater circuits sandwiched between layers of synthetic rubber. Tailored to fit The sandwiched circuits, tailored to fit individual applications, are attached directly to metal surfaces without impairing aerodynamic efficiency. They are designed to work off the aircraft's normal electrical system. Wattage can be varied as necessary. Can be automatic The circuit can be heated continuously or in cycles—or in a combination of both—by means of a controller. With an ice detector, the installation becomes fully automatic. Many applications In addition to jet engine intakes, shown on the opposite page, this system of protection is suitable for cabin heater intakes, air intakes, radio antennae, spinners and shutters. i i DUNLOP RAMS OPEN THE EYES OF REHEAT JETS Designed to operate the 'eyelids' of jet re-heat nozzles, these Dunlop rams operate at tempera tures exceeding the melting point of tin at 250°C. Actuation is controlled by a simple two-position solenoid operated valve. High temperature air filters and pressure reducing valves have also been developed for use with these rams. THE HEAT IN THE SANDWICH How the Thermal Mats are constructed Above is an illustration of an intake with the top layer of rubber removed to expose the heater element. An electrical circuit in nickel alloy is cut from metal strip less than -010" thick. It is applied to the metal intake between layers of unvulcanised heat resisting chloroprene. Finally the entire assembly is subjected to heat and pressure to embed the circuit securely between the plies and cure the rubber compounds. This curing or vulcanising process produces the required weather resistance and other physical properties necessary to ensure the efficiency of the system. Dunlop makes things better for everyone 4H/607
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