Reading up on bump steer, and suspension geometry.....
Holy sh*t.![]()
Too bad Willyswanter isn't around to help you with the calcs. He read everything out there while designing his stuff.
RIP Jason.
Reading up on bump steer, and suspension geometry.....
Holy sh*t.![]()

Bumpsteer isnt too hard to figure in. The biggest is camber travel over the suspension cycle, and akerman angle.
Just make the arms pivot on the same plane as the draglink and it all works out. It would be easiest to just model it right off of you quad.

I don't have any kids yet, but I want one now just so I have an excuse to build something like this!! Keep up the good work!

Mike,
You might be missing a golden opportunity here.....
DON'T build your kid a vehicle with perfect suspension geometry right off the bat. It would be much more educational to let him drive it for a while and experience bumpsteer, or understeer, etc. Take some time to explain the phenomenon with him.... How to identify what it is, etc. only THEN do you sit down with him and redesign and rebuild it.
Imagine how much more meaningful it could be as a father/son project to actually work through a problem, and arrive at a new solution.... One that works better and that he can "feel" working better. That sort of problem solving exercise would be priceless, and could encourage him to think creatively and critically about finding and resolving mechanical issues.
Just a thought.
-G

Mike,
You might be missing a golden opportunity here.....
DON'T build your kid a vehicle with perfect suspension geometry right off the bat. It would be much more educational to let him drive it for a while and experience bumpsteer, or understeer, etc. Take some time to explain the phenomenon with him.... How to identify what it is, etc. only THEN do you sit down with him and redesign and rebuild it.
Imagine how much more meaningful it could be as a father/son project to actually work through a problem, and arrive at a new solution.... One that works better and that he can "feel" working better. That sort of problem solving exercise would be priceless, and could encourage him to think creatively and critically about finding and resolving mechanical issues.
Just a thought.
-G



This probably couldnt be said much better. Involving them at a young age really helps with their future design and problem solving techniques. Rather than taking it to a mechanic for a broken oil dipstick like some teens I meet these days. You know the ones, they give you that horrifying look when they find out you replaced your own clutch, or installed brakes on your wives car.....
Furthermore, its actions like that that improve their lives and abilities in all aspects of life, not just building Tool Man Tim Taylor type rides for their future kids. That being said, I pray my children build something ridiculous for my grandchildren one day. Something so bad that I say what a danger it is to them, while secretly smiling and being proud of my kids for doing it.

Greg.... I don't think we give you enough credit, around here...
That idea is GENIUS.
Totally gonna do that.
Congrats bro, you just helped teach a kid "how to fish."
Not to mention, helped a dad be better.
Thanks...![]()

AND, gave you an out for when you F-up the design
Get after it!
looking good.
so true....

Problem was, I just got involved with the wrong people, ended up a pretty bad drug addict and major alcoholic for awhile. Having my daughter is what finally got me out of that nonsense. But it took alot, friends getting locked up, people getting killed, guns being pulled on me and losing over 50lbs due to, well pretty much due to not eating cuz rock star lifestyle has no time for food and Im covered in tattoos that are considered "undesirable" to my much older close relatives. Craziness. Unfortunately alcohol can still get to me sometimes, but thats another demon. All in all, you seem to be doing an excellent job with yours, and your personal early life problems make it easier to spot and correct potential problems in your child before they become major things. Now, looking back at my mistakes, I hope they can help me become a better person and hopefully a better parent to my two little animals. I honestly believe that was my father/mothers major flaw if you will, is that they never got involved with anything as deep as I managed to, so they couldnt figure out what to do until it was to late, and I left when I was 17 and there wasnt anything they could do. 




all this squaking and no pics![]()
