The third, and largest of the engines yet announced is the Her-criles, which was shown in public ior the fist time at the Paris aeronautical exhibition "last November. It is the most powerful engine yet to pass the severe British official po tests, and has been ordered in quantity by the Air Ministry I may reveal to-day that the medium supercharge Hercules which is a double-bank, 14-cylinder, radial unit, with total cylindrical capacity 38.7 litres, has international rating 100/1150 h.p. at 5,000 ft, and attains maximum power output of 1325/1975 h.p. at 4000 ít. Other versions of the Hercules are also in development.
The structural weight is relatively low and fuel consumption is small while the Hercules is planned to take full advantage of the impending
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