How to Make an RC Plane That Drops Bombs

Written by sarah terry
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Radio-controlled model aeroplanes can be made to carry and release flour bombs, water bombs, parachutes, candy or just about anything else that is small and lightweight. You can also build a bomb bay as an integral part of the aircraft, with a servo-activated mechanism to open the bomb-bay doors. You can strap on an external, enclosed bomb bay, with a door that will open upon release, directly to the fuselage. In a few steps, you can make a simple, removable, servo-activated bomb release without having to modify your RC aeroplane.

Skill level:
Moderately Easy

Things you need

  • Free channel on the transmitter
  • Free channel on the receiver
  • Micro servo
  • Single-sided servo horn
  • Servo extension harness
  • Zip ties
  • Rubber bands

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  1. 1

    Secure the micro servo while it's lying on its side onto the belly of the fuselage, using a zip tie. Position the servo forward from the leading edge of the wing and keep it as close to the centre of gravity as possible. You can also attach the micro servo permanently to the bottom of the fuselage, if you like. This should not dramatically affect the aircraft's centre of gravity if you're using a 4-gram micro servo.

  2. 2

    Plug the micro servo into the on-board receiver, using the servo extension harness, if necessary. Check to make sure the proper channel is used to activate the servo.

  3. 3

    Attach the single-sided servo horn at a 90-degree angle from the fuselage, pointing straight down. Check the horn for proper operation. When activated, the servo horn should move 90 degrees toward the rear of the fuselage and be flush with the fuselage. If not, turn the servo around or use the reversing switch on the transmitter.

  4. 4

    Find a strong rubber band that will be about the same length as the distance from just in the front of the servo to the rear of the wing. Insert the zip tie through the rubber band behind the trailing edge of the wing and secure the rubber band around the fuselage.

  5. 5

    Pull the rubber band over the servo horn so that it's snug but not too tight. Remember that the rubber band will stretch more when you're securing a payload under the fuselage. Check for proper release when the servo is activated.

  6. 6

    Place an Easter egg talcum-powder bomb, small water balloon, parachute or other "bomb" under the belly of the plane. Pull the rubber band over the bomb and slip the rubber band on top of the micro servo arm. When activated, the rubber band should release and the payload will drop.

Tips and warnings

  • Keep the payload light and balanced under the plane's centre of gravity as much as possible. If it is too heavy, your RC plane will not fly, and if the centre of gravity is off, the aircraft could become uncontrollable.
  • Small falling objects can achieve great speeds and cause damage or injury. Never fly over a crowd, vehicles or buildings. Use only inert, non-flammable materials for your plane's bomb.

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