It was an alternate technology to the heavier caliber 140 mm gun by using the dual-caliber approach. The XM-291 is the best existing example of a working electrothermal-chemical gun.
Tests of this gun have been performed using “precision ignition” technology, which may refer to ETC ignition.
The United States’ XM360 (cancelled in 2009) was reportedly based on the XM291 and may include ETC technology, or portions of ETC technology. These include the United States, Germany and the United Kingdom, amongst others. Several countries have already determined that ETC technology is viable for the future and have funded indigenous projects considerably.
Electrothermal-chemical (ETC) technology is an attempt to increase accuracy and muzzle energy of future tank, artillery, and close-in weapon system guns by improving the predictability and rate of expansion of propellants inside the barrel.
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