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It had a speed of 121 miles an hour at 10,000 feet, to which height it could climb in under 10-1/2 minutes, and a ceiling of 23,000 feet. The Martinsyde F.4, embodying further improvements, was not ready in time for active service. In 1916 the "pusher" type was superseded by the Sopwith "1-1/2 Strutter" armed with a synchronized Vickers gun, which for its 130 horse-power was never surpassed.
Day-bombing squadrons had to fight their way to objectives in close formation, and the problems connected with navigation, calculation of petrol supply, action of wind and ceiling, were all accentuated. Casualties were heavy, with the result that a squadron of Fighters, composed of Sopwith "Camels," was incorporated for the purpose of protection.
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