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@goatsarah You are 100% correct about the issue of dead battery weight, hydrogen tanks have the same problem to a lesser extent, but lack the flexibility batteries have in form factor-you can wedge those bastards in all sorts of convenient places.

As for gliding? Well, most powered aircraft, particularly all jets that I know of, are *terrible* gliders. The aerodynamic rules that make them efficient at high speed also dictate that they float like rocks, so that's not a major consideration. 2/2