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Just how powerful are they?
I have run into a guy who says B-tech lasers can not be very powerful due to various real world reasons like the energy needed in some of the older numbers would burn through feet of iron plating (to melt ~60kg of B-tech armor would require around 200 megajoules),
BT armor is usually millimeters to centimeters thick. Since the materials and their densities are pretty well known, it's easy to guess at armor tonnage vs 'Mech armor, and it ain't feet thick.
However, the 200MJ per armor point figure should tell you that BT lasers are very, very powerful. The USAF's Airborne Laser would need 200 seconds to deliver 200MJ.
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or cook the pilot if assumed the armor spreads the heat
Whatever. Thermal conduction is a slow process. When you dump enough energy into armor plate to destroy 60kg (per point of damage) in less than 10 seconds, there's no melting or widespread conduction. There's localized ablation and surface explosions.
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He even said that jump jets are garbage as the reactors should have enough thrust to allow a mech to fly at these out puts...
Sure, the jump jets have plenty of thrust to support flight. Once you have the thrust to get a 'Mech off the ground, you've got plenty of thrust to keep them in the air and propel them. However, jump jets don't have the endurance to support flight, which Tech Manual spells out.