I'm with you on not having a drone in the logo. Everybody and his nephew has a drone these days so it's not exactly notable. Plus if you ever branch out into using balloons, kites, rockets, or antigravity sleds it'll kind of date you.
I like Caterpillar's logo. It doesn't have caterpillar tracks, wheels, buckets, blades, or anything that reflects their equipment other than the name. (Granted, it's a name that already has worldwide recognition.) It has a mound of dirt. Nobody cares how a Cat product works, they just care that it'll move that mound of dirt.