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Well, they usually don't have variable pitch. But there are a few rare examples of variable pitch quadcopters, for instance this monster from Curtis Youngblood:

http://www.curtisyoungblood.com/legacy-product-support-curti...

For most applications you don’t need variable pitch blades on a quadcopter, they’re also very delicate and break easily on drones.

I used to fly r/c helicopters before drones became popular. The pitch mechanism was routinely a source of problems for me. It’s pretty amazing to watch it work though.

neat! but (speaking of the pendulum fallacy) if the fuel tank was attached with cables instead of a fixed structure, wouldn't that actually work?