@Tweedle_Aerospace I test my engines in my own way so... Don't bother these tests it's my rocket not yours (Me not being a meany)

@EggySPACE Elon himself said that he doesn’t ever recommend firing the Vacuum engines in atmospheric conditions

@EggySPACE yes and both of those both weren’t full power and they would not be able to be used again. Here is a vacuum engine test chamber and both of those engines did not go to full thrust and did not have full length nozzles. Neither were the finished product and were designed to be able to fire in atmospheric conditions without breaking apart. While the vacRaptor will be able to fire at sea level, it will break apart and blow the inside of the nozzle apart and then break apart, leaving it with no engines. It can for very short times. Not even long enough to propel the vehicle into orbit.

@Tweedle_Aerospace Click this links Raptor

Merlin

@EggySPACE no they don’t. Unless they bring them into space and then fire them up than yes technically they do.

@Tweedle_Aerospace they test vacuum engines OUTDOOR.

@EggySPACE what are you talking about? They test in vacuums all the time. If they didn’t a vacuum engine would explode in the atmospheric conditions if it was operating at full capacity.

@Tweedle_Aerospace that's unrealistic lol maybe in the far future we'll get to see one. (in real life of course 😂)

@Tweedle_Aerospace I wanna make it realistic as possible... If it is in a vacuum chamber it'll burn the chamber or melt it.

@EggySPACE inside a vacuum chamber

@Tweedle_Aerospace Spacex does that as well with their RVac or raptor vacuum they test it on McGregor Texas.

Why would you fire a vacuum engine in a non vacuum environment? That doesn’t give you any accurate results.