Knex "K*bot" competitions (kbotworld.com)


I was bored and decided to google "Knex". What I found was very interesting. Apparently there are competitions for Knex robots that do battle with each other. As I read this I thought about how us Knex gunners at Instructables could easily dominate these competitions; because we are the kings of Knex warfare.
We could have a collaboration group based around K*bots, where we will post ideas and eventually have designs for the ultimate robot. Then when the competitions come around we could find somebody who lives closest to the competition to build the robot and enter on behalf of our collaboration.

But there's a catch: There are rules, an one rule states that projectile weapons are banned. But I believe there are ways around this, as the exact ruling on this goes:

"Projectile weapon systems which can launch a K'NEX part clear off the K*bot are banned due to safety reasons. Any other weapons systems which the organizers deem too dangerous will also not be permitted."

This could easily be avoided by fixing the projectiles to the robot. For example: My cannon could use an extremely long bullet that has rods in the back of it, preventing it from ever leaving the robot while still delivering a deadly impact. But don't forget that weapons NOT based on guns will also be essential.

So what do the rest of you think?

Picture of Knex
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Sketch986 years ago
the way to win is to:
1. Build the robot that is lowest to the ground so others will drive over it.

2. Gear down the motor as much as possible so that it drives very slow so if another robot drives over it then the other will go over the table first. Also if it were a pushing contest the other may be faster but it will not have as much torque and traction as our robot, therefore the wheels of the other robot will spin out and not take it anywhere.
crestind9 years ago
So basically you just push the other robot off... Well projectile weapons would be pointless anyway... Obviously you just build something that protects the wheels, preventing it from flipping over. On the front, you just build a big shovel thing that flips the other guy over... I don't think a your cannon could deliver a deadly impact to a Knex robot. At most it might punch out a snowflake piece or simply snap the bullet. Plus if the bullet stayed on it would be unwieldy.
OR, do any of you watch Robot Wars....cuz do a design like TORNADO, then, if it flips, it carries on driving, just in the opposite direction
oodalumps (author)  crestind9 years ago
You underestimate the cannon. If you look at the majority of the robots, even a rod-shooting gun could do some damage. The cannon would completely impale most of them; and if it doesn't, it should send it flying off the table. And with some good engineering, I could get one motor to pull it back in and release it. And lets stray away from our guns for a second. A rubber band powered flipper would work good too. If it doesn't have enough power to flip the opponent, it would lift their tires up while pressing ours harder to the table, it'll have more traction and win.
Well these aren't like real robots where much of the inside is packed with vital electronics. Even if it gets impaled, it's unlikely it will have any effect. The only thing that's important would be the motor box, and I doubt any Knex gun can damage that since it's covered by a solid layer of plastic. Also, a bullet can't send it flying off the table. It does not have enough momentum (assuming it is a rod). And for that to be possible, it would need to be very heavy and big, which would thus negatively impact the robot's mobility. If the bullet is physically connected to your robot, you would have to ensure that your robot is heavier than the opponent's; otherwise your robot would go flying off the table. Projectile weapons are out of the question. The only way to win would be through power and maneuverability.
oodalumps (author)  crestind9 years ago
I said cannon didn't I? I said extremely long bullet didn't I? I'm not so naive as to think that a rod could send a robot flying. And it's not a projectile when it's on the robot, it's a powerful ram. A cannon bullet that's a foot+ long will have a lot of momentum behind it.

And the weight issue can be overcome by your own robots velocity. It would be easy to make a robot that has a mechanical timer that starts the robot moving with rubber bands as it's means of movement. This will give it some awesome speed (well, for a Kbot). A switch could be mounted to the front of the robot so the cannon could be activated on impact with the switch (this is assuming it's in the 1-motor division). Then the combined speed of the robot an the ram will hit the opposition. Shortly after the robot switches to the motor for movement (if it hasn't won already).
I know, I was simply saying regardless of size, projectiles are out of the question anyway. The ram method you described may work if your robot is heavier than the opponent's.
Or have one that is designed to pierce the opponent and jam their drive mechanism.
Hmm, brilliant! We'll just add an EMP to the robot, turn ours off, set off the EMP, then turn ours back on, It will work!
Electromagnetic pulse!? Hmmmm.. I think we would get disqualified and we might blow some stuff up-like the venue!
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