Powered by Le Rhone 9C or Clerget 7Z engines the MBbis was armed with a single machine gun mounted, either in a fixed forward firing mount firing through the propeller fitted with deflector plates, or in angled or elevated mounts firing outside the propeller disc.
22.
Having the two guns firing simultaneously would obviously not have been a satisfactory arrangement; the guns needed to both fire " at the same point on the propeller disc ", which means that one would fire a tiny fraction of a second later than the other.
23.
Fokker's initial answer to this was the fitting of extra " followers " to the " Stangensteuerung's " large cam wheel, to ( theoretically ) produce the " ripple " salvo necessary to ensure that the guns were aimed at the same point on the propeller disc.
24.
:* P-factor refers to the lateral shift of the propulsion vector ( P-vector ) in a rotating propeller disc due to the increase of the angle of attack as the airspeed decreases, resulting in an increased yawing moment, that has to be counteracted by increasing the rudder input for maintaining steady straight flight.
25.
The E . S . 1 first flew in August 1915, Following operational trials in France, it was fitted with a modified cowling to allow fuel to drain away from the engine, and was armed with a forward-firing Vickers machine gun with the Vickers-Challenger gun synchroniser allowing the gun to fire through the propeller disc.
26.
It was a small wood-and-fabric synchronising gear to allow a fixed gun to fire through the propeller disc, a hole was cut in the upper wing above the gunners seat, so the gunner could stand with head and shoulders above the wing, giving him a good allround field of fire for his Lewis gun, including forward over the propeller.
27.
This had a Wright R-1820-78 Cyclone engine, slightly longer main landing-gear legs carrying wheels with low-pressure tires, a tailwheel in place of the tailskid, fabric-covered control surfaces on the tail, and external provision for underwing racks for light bombs as well as an under-fuselage hardpoint for either a 50 gal ( 189 l ) fuel tank or the crutch that would swing a bomb clear of the propeller disc before release in a dive-bombing attack.
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