raumzeit's latest activity

That's nonsense. Helicopters work by simple Newtonian physics, they continually throw money at the ground until the weight of the money...

Closer vehicle's propellant exhaust velocity is to vehicle's actual velocity closer it is to ideal where momentum sums to zero. Always...

Lithium batteries at current state-of-the-art can easily keep a tank of diesel warm enough for a long time without needing giant piles...

In R-C world, there's really high-discharge graphene-substrate batteries for sale now. Power-density not much different than regular...

They could make an order of magnitude reduction in vehicle complexity and COST for the whole urban air mobility thing, by accepting...