There are no four in my world. How to build tnt bombers?

1, required materials: piston X 1, viscous piston X 1, observer X 1, ruby X 1, emitter X 1, and slime block X3.

Step 1, prevent the plane from being blown up and stuck far from the ground. Place two mucus blocks vertically.

3. Step 2: Facing the plane direction, place an observer and a viscous piston on the right side of the mucus block.

4. Step 3, put a sticky block 3 in front of the sticky piston, and put the piston next to the sticky block 3, with the back of the piston facing itself.

5. The last step is to put a transmitter and TNT on the mucus block 3. Next, we just need to put the red stone on the ordinary piston to start the plane.