• MK IXa Course setting Bomb sight. Original in transit case with accessories. 1936


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    Here we have a rather tasty MK IXA Course setting Bomb sight in its original transit case with accessories and importantly a completed log book recording its service and use. Condition is excellent as per the photos. Dated 1936 this is an early example made by R.B. Pullen & Co of Middlesex London. In the past I have had Canadian built versions of this sight but not a UK made version. This is a superb example of a bomb sight which was used in several different types of Allied Aircraft such as the Hampden, Blenheim, Wellington, Whiteley etc. The sight is clearly stamped with the AM mark and several other stamps including the stores reference number and the Wimperis patent numbers. It has a full tray of interchangeable slides along with a strap and a log book. The log book has been completed giving a full history of the bomb sights use. Again I have had sights with log books but never a completed one. Also included yellow pencil as used by the bomb aimer


    This is a museum quality item as shown in the photos


    The Course Setting Bomb Sight (CSBS) is the canonical vector bombsight, the first practical system for properly accounting for the effects of wind when dropping bombs. It is also widely referred to as the Wimperis sight after its inventor, Harry Wimperis, who started work on the sight in 1916. The idea was to put as many of the manual calculations required for aiming into an easy to use device. 

    The bomb aimer dialled in the wind direction on the compass, then wind speed, airspeed and altitude on different knobs. These adjustments carried out all of the adjustments needed to set the range angle properly. These also included a separate adjustment for “trail”, the deceleration of the bomb due to drag. At higher altitudes or forward speeds the bombs would reach terminal velocity long before impact, which had the effect of making the last portion of the flight path more vertical. 

    The CSBS was developed for the Royal Naval Air Service (RNAS) in order to attack submarines and ships. It was introduced in 1917, and was such a great advance over earlier designs that it was quickly adopted by the Royal Flying Corps, and the Independent Air Force. It has been called "the most important bomb sight of the war" 

    This sight was that effective that it went on to see service throughout WWII

    Any inspection welcome. Collection would be preferred due the delicate nature of this item

    Postage costs include Insurance.

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