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Fnkced up with the mental concept of offset? So was I. Then, like a nail gun to the back of the head, inspiration struck! Offset is indicated by the use of the initials ET. ET is short for Einpresstiefe - a German word meaning 'Insertion Depth'. Let's use it in a sentence: In November 1941, the 4th Panzer Army's maximum Einpresstiefe was 30 km west of Moscow. Now, to visualise offset, it helps to imagine Russia as a giant wheel arch, and the German 4th Panzer Army as a wheel (no, not a tank track). At ET 0, the mounting face of the wheel hub is level with the half-way point between the inner and outer lips of the rim (say, near Minsk). The further IN to the arch the wheel goes, the GREATER the Insertion Depth i.e +30 (Mocbah!) The further OUT of the arch the wheel sits, the LESSER the Insertion Depth i.e -20 (Only as far as East Poland.) Adding a spacer moves the whole wheel further OUT, DECREASING the Insertion Depth (ET) ie. +35 to +25 Machining metal off the wheel hub mounting face moves the whole wheel further IN, INCREASING the Insertion Depth (ET) ie. -10 to -5 Next week, Darkmeat will explain the workings of the float valve, using Nelson's series of consecutive victories at Copenhagen Ushant Nile & Trafalgar to illustrate.
