Scrambler B

[croman74]

Yeah but It does veer to the left after 9 or so meters any tips straightening it out

How are you attaching the wheels to the axle?
Also you could hope that the stopping distance at the competition was 8 meters or 8.5 meters.

[jweil_buddha]

They are attached with wingnuts and glue and are most likely the problem
but is there any other way of straightening

[croman74]

They are attached with wingnuts and glue and are most likely the problem
but is there any other way of straightening

Try not to use glue. I know you asked for another way, but that's probably the problem.

[Flavorflav]

They are attached with wingnuts and glue and are most likely the problem
but is there any other way of straightening

Yes. You can cut the frame and put in an adjustment. If you lengthen the right side slightly, your car will curve left; shorten it and you'll curve right. You can use a mending plate with a slot cut into it, or a turnbuckle (probably the easiest but least stable) or you can build in screw adjustment (best but hardest).

[bob3443]

are you using any type of bearing(roller blades)?

[captbilly]

Yeah but It does veer to the left after 9 or so meters any tips straightening it out

If it is truely not veering off until 9 meters then it would have to be related to the braking system causing the scrambler to turn when they are applied. Usually when people notice that the vehicle seems to be turning when it gets out to 9-10 meters it turns out that the vehicle is always in a slight turn but it only becomes noticable at longer distances. If you look at the geometry involved you will notice that the vehicle will not diverge linearly if it is in a constant turn. The divergence will be exponential. In other words, if the vehicle diverges 2 mm a 1 meter it will diverge 4mm at 2 meters and 8 at 3 meters 16 at 4 mm and so on. This is not an exact analysis but you get the idea. The point is that the error may only become apparent at longer ranges but it is actually there at all ranges.

The other possibility is that you have some missalignment between you aiming system and the pointer on your scrambler. So at certain distance the aiming system points at the correct aim point while at others it does not. This kind of error is the reason why a properly aimed rifle and scope will have only two distances where the bullet is perfectly aimed, the two places where the trajectory of the bullet crosses the exact aimpoint of the scope. COme to think of it you could have exactly the same issue with scrambler or electric vehicle. The slightly curved path of the vehicle will cross the aimpoint at only two places (one of those spots may be beyond 10 meters so you will never notice it).

But why do you care about the vehicle veering off anyway, in scrambler you don't get penalized for aim point. I guess you could be so far off aim that the scrambler is going off the track, then you need to find a way to change the steering angle.

[jweil_buddha]

thanks I believe it is slowly doing it the whole time like you said
Also this year you do get scored on straightness
Do you know any simple fixes?

[bob3443]

But why do you care about the vehicle veering off anyway, in scrambler you don't get penalized for aim point. I guess you could be so far off aim that the scrambler is going off the track, then you need to find a way to change the steering angle.

this year the distance is measured from the tip of the egg to the CENTER of be wall, so if it goes straight it will be closer.

[croman74]

But why do you care about the vehicle veering off anyway, in scrambler you don't get penalized for aim point. I guess you could be so far off aim that the scrambler is going off the track, then you need to find a way to change the steering angle.

this year the distance is measured from the tip of the egg to the CENTER of be wall, so if it goes straight it will be closer.

That's probably one of the biggest differences in the rules along with not allowing a backstop.

[bob3443]

at my regionals many teams had backstops, and they weren't second tiered. one guy asked the judge and he said something like "the rules doesn't say you need a backstop, but you can have one if you want it" i thought you weren't allowed to have it because you can't see the back tip of the egg.