Ion aircraft drive systems might become two-fer rainmakers. Who knows.
https://spectrum.ieee.org/cars-that-think/transportation/air/an-airplane-with-no-moving-parts
MIT researchers have flown the first airplane that has no moving parts. The aircraft, packed with lithium-ion batteries, used an ion thruster to fly the 60 meters that were available in the indoor flight area.
The plane weighs a little over 2 kilograms (5 pounds), and its engine has a thrust-to-weight ratio roughly comparable to that of a jet engine. Its lithium-ion batteries put out about 500 watts.