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Several former engineers of the failed Franklin Automobile Company formed Air Cooled Motors in 1935. By 1938 a range of flat-4 and 6 aircraft engines was being produced, retaining the Franklin name. This post-war product was the largest model. In 1975, the company disbanded and sold all rights to the Polish government, becoming part of PZL, an association of Polish aero and engine manufacturers. Following the 1989 fall of Communism, the firm became WSK PZL – Rzeszów.

The Aircooled Motors (Franklin) XO-425-3 was a horizontally-opposed airplane engine with a reduction gear propeller shaft and a geared supercharger. Similar to the Aircooled Motors 0-405-9, it was a larger but lighter engine, with higher compression. While the specific airframe application of the experimental XO-425-3 is not known, the O-425-5 model powered the Convair L-13/A/B.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa late 1940s Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Aircooled Motors Corporation (Franklin)
 Physical Description Type: Reciprocating, horizontally-opposed, 6 cylinders, Air-cooled Power rating: 186 kW (250 hp) at 3,200 rpm Displacement: 6.8 L (425 cu. in.) Bore and Stroke: 121 mm (4.75 in) x 102 mm (4.00 in) Weight: 213.2 kg (470 lb) Dimensions Storage (Rehoused on metal pallet and stand): 165.1 × 116.8 × 124.5cm, 371.9kg (5 ft. 5 in. × 3 ft. 10 in. × 4 ft. 1 in., 820lb.)
 Materials HAZMAT: Cadmium Plating
Aluminum
Paint
Steel
Plastic
Copper Alloy
Synthetic Fabric
Paper
Ink
Adhesive
 Inventory Number A19600106000 Credit Line Transferred from the U.S. Air Force Central Museum Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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