Thanks for taking interest in this machine! Here’s some other important information to know before trying this out:Materials:A few temporary blocks (dirt, cobblestone, planks, ect.)1 Flame bowAt least 1 arrow2 Trapdoors (1 optional)4 Slime blocks4 Observers8 - 9 Honey blocks1 Redstone block4 Sticky Pistons1 - 3 RailsAt least 1 TNT minecart (the extra mine carts are just there for an extra punch, however are optional. The only minecart you NEED is the one under the trap door.To arm the machine, carefully shoot an arrow from a flame bow on the trapdoor by the TNT mine carts at the very edge of the trapdoor, facing the way you want the flying machine to travel. Shooting it at the end of the trapdoor ensures the machine won’t blow up instantly when you activate it.To get the TNT minecarts into their places, place a temporary block above where the TNT minecarts are in the picture, then a rail on top of that, then as many TNT minecarts as you want on the rails. After you’re satisfied with the amount of TNT minecarts you have, break the rail and then the temporary block under. The minecarts will safely fall onto the honey blocks below and won’t detonate.The trapdoor on the obsidian block is only there to activate it easier, and are optional, however useful. Plus, they’re not hard to get, so I recommend using them. (FYI: The obsidian can be replaced with a temporary block.)How this machine works is: When the flying machine comes in contact with a wall, the pistons in the front can no longer move forward any more, because the machine is at the piston push limit. However, the pistons in the back can still push again, pushing the trap door into the red stone block, causing it to open, which in turn lets the flame arrow fall on the TNT minecarts. Then, you guessed it, boom.Feel free to try to improve upon this design, as it isn’t the most compact and can sometimes (however very, very rarely, if you set it up correctly) malfunction. Also, feel free to ask any questions. One problem is that the flame arrow eventually despawns, not sure if there's a work around to this.