use propulsive in a sentence.
They are going to test the propulsive return profile by doing a retro burn and then slowing down with another burn before hitting the water.
So is it conceptually possible to imagine some kind of propulsive device being built using the reverse Casimir effect described in the article?
The other complication for an m2 radiation shield is that it would be slightly propulsive, which would slightly complicate planning trajectory planning (though not badly so).
More modern spacecraft use non-propulsive systems such as momentum wheels and gyrodines to maintain 3-axis attitude control and use thrusters to reset only when those systems become saturated.
One problem i see with spacex is their propulsive landing feature.
The human body is a gigantic chemical engine, but it operates in a different way from a (jet/propulsive) engine.
They'll probably still be landing in depopulated areas --- you want to minimize damage on the ground if the propulsive landing system fails.
More info: "The relatively low-deployment altitude means drag from Earth's atmosphere may dominate any propulsive power it gains from the sun, but the project represents a small first step toward eventually deploying solar sails at much higher altitudes...
Now, compare this to propulsive landings.
First off, if the goal is to save fuel from having to do a propulsive return to the launch site then that's not going to happen (except for the 2nd stage and capsule).
The key is to understand that the longer a vessel in the water is relative to its width, the faster it can go in a straight line with the same propulsive input.