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Maybe because you want a robot with more than 30 minutes' autonomy?

Wheels (if practical) are best. Then legs (or wheel/leg hybrids). Then fixed wing (if you have somewhere you can take off and land). Multirotors are easy and fun but only practical for short missions.

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There aren't fixed wing drones with VTOL? I'd imagine something like an Osprey would do well.

As well as an Osprey, or as well as a motorcycle with a sidecar. They are practical, but far from elegant or efficient.

There are, but I was trying to keep it short. Alphabet's "Project Wing" drones work like this, for example. They seem a bit inelegant though.

Regular old small RC planes can do a heck of a lot more than 30 minutes. Also, the Spot only has 90 minutes of battery life.

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