Bristol Braemar

The Bristol Braemar was a British heavy bomber aircraft developed at the end of the First World War for the Royal Air Force. Only two prototypes were constructed.
Development.
The prototype Braemar was developed in response to the establishment of the Independent Air Force in October 1917, as a bomber capable of the long-range bombing of Berlin if necessary. A large triplane, it had internal stowage for up to six 250 lb (110 kg) bombs.
The initial design featured a unique engine installation with a central engine room housing all four engines. The engines were to be geared in pairs and power taken from the engines to the four propellers by power shafts. This design was abandoned early in development, and both the completed Braemars had a conventional engine installation, with the engines in inline tandem pairs, driving pusher and tractor propellers. However, the engine-room design was resurrected later in the Braemar's development life, for the proposed steam-powered Tramp.
A contract from the Air Board for three prototypes was awarded to Bristol & Colonial on 26 February 1918. The first prototype Braemar flew on 13 August 1918, with four Siddeley Puma engines. The prototype showed generally good performance with a top speed of , but there were complaints from the test pilots about the view from the cockpit and the controls, and so the next aircraft produced was an improved version designated Braemar Mk.II. The Mk.II received considerably more power from its four Liberty L-12 engines, which gave it an improved speed of .
The Braemar never entered service with the RAF, and the two prototypes were the only Braemars built. The third prototype was completed as a Pullman 14-passenger civil transport.