The Germans were again the ones to produce the most capable gun-fired HEAT rounds, using a driving band on bearings to allow it to fly unspun from their existing rifled tank guns.
32.
Ships were therefore issued with " augmenting strips ", which were long strips of copper that were hammered partially into the recessed ring around the projectile ( cannelure ) that held the driving band.
33.
Once a gun had fired about 100-110 rounds with full ( brown powder ) charges, the rifling became worn near the breech, such that it was necessary to augment the width of the driving bands.
34.
The other distinguishing characteristics of a " Keith-style " SWC are a double radius ogive, beveled crimp groove, three equal width driving bands, wide square bottomed grease groove, and a plain base with sharp corners.
35.
Normally artillery shells are sealed into the rifling by a driving band of soft metal like copper, which demands that the shell be shaped so that it balances at its widest point, where the band is located.
36.
The new "'FH Gr Fern "'long-range shell was about longer than the normal shells used by the leFH 18 guns, but had a shorter streamlined section behind the driving band to accommodate the larger powder charge required.
37.
Due to a difference in the size of the whorls ( the round pieces or pulleys around which the drive band runs ) the bobbin whorl, which has a smaller radius than the flyer whorl, turns slightly faster.
38.
It is caused by imperfect bearings, uneven motor windings, vibrations in driving bands in some turntables, room vibrations ( e . g ., from traffic ) that is transmitted by the turntable mounting and so to the phono cartridge.
39.
The hot expanding gas from the propellant is forced through vents in the base of the grenade that move the grenade along the barrel, and at the same time force the driving band to engage with the twelve rifling grooves.
40.
Gerald Bull worked extensively on ways to eliminate the driving band, leading to the development of his Extended Range, Full Bore ammunition using an inversion of the pre-cut rifling for his GC-45 howitzer, which is now rapidly replacing older artillery worldwide.
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