2 doors "clamshell" opening, hinged at sides.

The servo pulls a pin and that allows the doors to open. You can optionally also have the servo push the doors open... but the weight of the candy will do that for you.

Rubber band "springs" connected to the doors with eye bolts to hold the doors closed. (don't need much tension... the common daily paper size rubber band is plenty) Adjust the tension such that 2 pieces of candy will deflect the doors enough for the candy to drop out.

You can optionally add a second rubber band on a string-pull from the servo to add tension when you flip the TX switch back to the closed position.

Do NOT have the servo push the locking pin back in. That just asks for the servo to be bound up. The locking pin is just to keep the candy from dropping before you want it to. Pull the pin with a string.

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The candy drop plane is still bound by the AMA rule that you can not be overflying the spectators... Make a pass over the runway... drop the candy and immediately turn away from the flight line ... as the other club members open the gates to tlet the kids go after the candy, the safety line is moved from the spectator fence line to the far side of the runway. If you ned to land... use the grass 50 ft out from the nearest kids.