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this post was submitted on 15 Aug 2026
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Technology
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Every time I hear of an all electric aircraft of any size, I always wonder what they're going to do about landing weight.
Every modern transport category jet has a higher takeoff weight than landing weight, because of the simple unavoidable fact that landings are rougher than takeoffs. Taking off, the load gradually comes off of the landing gear, on landing it's suddenly applied. Jets burn tons, literally tons, of fuel enroute, so they're considerably lighter on approach. It's why aircraft have dump valves to jettison fuel overboard in case of forced landing early in the flight.
Batteries don't get lighter as they're discharged, so...?
Fun fact, batteries DO become lighter when they discharge. But obviously not like fuel. But it's still a fun fact.
You mean because of e=mc²? That's true but basically unmeasurable. Air batteries do get mesurable heavier.
FYI 1 kg battery when fully discharged loses about 10⁻¹² kg of its rest mass ...