Talk:United States Navy in Exile/@comment-32964013-20160301232233/@comment-26482266-20160302065802

"a) omnidirectional electromagnetic pulse, expanding in a spherelike radius from the outside of the ship

b) point-defense x-ray synchotron beams on wide-spread, shutting down the engines of all your missiles"

Conservation of Energy. A EMP cannot change a 0.2c ballistic missile other than destroying the missile's propulsion before it even launches. Same with with the synchotron beams (And either way, why would you bother wasting synchotron beams on the engines of missiles when you can, I don't know...disable the whole ship?)

"c) Tesla arc guns, which will arc to your missiles, frying their internal systems and perhaps even destroying them"

Depends on what they are made out of (I assume that they are mostly solid tungsten, due to how they managed to penetrate an Athens-class carrier reliably).

"d) sufficently advanced and numerous laser guns"

Turret rotation time. Something going at 0.2c would be near impossible to turn quickly enough to intercept.

"e) destroy your arsenal ships before you even launch any missiles"

Idek.

The main issue with the impeller drive is the speed of the round. Something going at 0.2c would be going fast enough in the atmosphere that it would slam into other atoms at near sublight speed, thus creating nuclear fusion reactions.