Hey, sorry it took a while to come but here it is! The first ever knex exploding RC-XD.I built it a year ago and I still have it today. It used to be remote controlled but my rc car broke one day when it went off a high hill accidently. That is why it has a strange looking body, but anyway, it works by using a time bomb mechanism I designed and built, then equipping it on a knex car body. I designed it so you can adjust the time bomb fuse by just letting out more string. To operate it in THIS CONDITION you would start the engine on the time bomb mechanism and you would send into battle. I designed it so a grenade would explode ontop of the car instead of the whole entire car exploding so you can reset it quicker, good thing if you want to use it in battle. I did design it so that after the string comes to an end and the ignitor goes off, the part of the blocker that the string is connected to and is facing the engine, will brake off so you do not have to run after the rc-xd and turn off the engine before it almosts brakes itself due to the engine trying to pull the string in more, even though it cannot so it will start to do that clicking and it would also brake the whole entire RC-XD. I did add the spikes just for fun, just warning you. It has a good blast radius, it really depends on the rubber band placement. Rate and I do not really think I have to post an instructable since it is easy.
Pic 1: Overall veiw fully armed
Pic 2: Closer veiw fully armed
Pic 3: Close up on the string mechanism, you can see where you can adjust the fuse
Pic 4: Close up on the grenade
Pic 5: Side view of the rc-xd, unarmed
Pic 6: Front view of the rc-xd, fully armed
Pic 7: Back angle view, fully armed
Pic 8: Side view, fully armed
Hope you enjoy it and rate!