Scrambler C

[Stealther]

Im looking into a automatic stopping brake Is there any ideas out there?'... Me and my partner are making a scrambler that looks like a formula one.

Thanks Stealther

[iwonder]

Look in the wiki, there are a few different designs.

[jacobxc]

Im looking into a automatic stopping brake Is there any ideas out there?'... Me and my partner are making a scrambler that looks like a formula one.

Thanks Stealther

What do you mean by automatic

[JimY]

Really? There's absolutely no need to try and point out hoe you think other people have misread the rules, it can come across as insulting. And for the record, yes, a large number of ramps were second tierd, and those that weren't (mainly those that had the egg at the starting line, I believe) were shown the rules that were in question and told that they should get clarification and watch out in future contests. That decision was made after consultation with various coaches, very through readings of the rules, and the input of tournament officials.

Many apologies iwonder. There is no insult intended. I drew a conclusion without the facts, hence I was wrong (which makes this a good example of bad science).

My only intention is for the students that are planning on using ramps to be uber careful. Different interpretations of the rules are possible. Mine may be more conservative than others, but after coaching SO for 17 seasons, I've learned to be this way.

[superblackcat]

All Breaking Mechs are automatic....


I believe the wingnut one works very well.

[iwonder]

Oh most definitely, people are going to need to be careful with ramps. Personally, I'm avoiding them entirely this year.

Sorry if I seem a bit touchy on the CyFalls subject, the tournament director (my coach) decided that I should deal with all appeals build related... and I spent a lot of time going back and forth with coaches and rules and ES's that day...

On another note... could someone try and explain the exit times listed on the scrambler wiki? I've taken plenty of physics and math, and it seems like the times posted for a spring type scrambler are higher than the conservation of energy would allow them to be. Also the times for hammer and push-rod launchers don't seem to correspond to the masses. Quadrupling the mass should double the speed, but instead it just goes up by 1/3 or so... I understand there may be losses, but the speed should still be proportionate.

[Jdogg]

Oh most definitely, people are going to need to be careful with ramps. Personally, I'm avoiding them entirely this year.

Sorry if I seem a bit touchy on the CyFalls subject, the tournament director (my coach) decided that I should deal with all appeals build related... and I spent a lot of time going back and forth with coaches and rules and ES's that day...

On another note... could someone try and explain the exit times listed on the scrambler wiki? I've taken plenty of physics and math, and it seems like the times posted for a spring type scrambler are higher than the conservation of energy would allow them to be. Also the times for hammer and push-rod launchers don't seem to correspond to the masses. Quadrupling the mass should double the speed, but instead it just goes up by 1/3 or so... I understand there may be losses, but the speed should still be proportionate.

Spring System:
Let's assume the vehicle to weigh 100 grams. This is a very light vehicle and the center of mass of the mass is dropping 2 meters and when it reaches the floor is is at a standstill point. You also have a ideal spring, with the ideal k value such that the mass does have enough force at the end to still pull the spring even when it's not moving.
Now the potential energy of the mass is Mass(weight)*gravity*height it drops. Now that is converted directly into potential energy in the spring or 1/2kx^2. Now since those values are the same, I'm just going to ignore the 1/2kx^2 because I'm assuming that it is already a optimized system. Now that potential energy is converted directly into kinetic energy of the car. Since I'm assuming this is a perfect scenario, let's say the spring is close to mass less. Now our final equation is just M(weight)gh = 1/2m(car)v^2.
Since we can assume the mass is 2kg and the car's weight is only 100grams (very light car, this is basically just the weight of the egg. We get the equation
(2kg * 9.8 m/s^2 * 1m * 2 / .1 kg)^.5 = 19.798 m/s assuming the car weighs 100 grams. This would give us the smallest time of .404 seconds if the distance at the competition was 8.2 meters.
Hope that makes sense. You can use different principals for the other means of propulsion.

[iwonder]

Oh, yes, that makes complete sense, I did the calculations myself and came out with values mirroring yours. I'm not clear on how whoever did the wiki calculations got the numbers they came up with.

[Jdogg]

Oh, yes, that makes complete sense, I did the calculations myself and came out with values mirroring yours. I'm not clear on how whoever did the wiki calculations got the numbers they came up with.

most likely a different mass of the vehicle or less ideal conditions.

[iwonder]

It still doesn't account for the fact that quadrupling the falling mass doesn't even close to double the exit speed.

But meh, I'm just gonna ignore those numbers then.