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by sachleen
March 10th, 2014, 10:52 pm
Forum: 2014 Build Events
Topic: Scrambler C
Replies: 459
Views: 46270

Re: Scrambler C

What times are people looking at right now? Our current car is about 4.6 ish seconds
Fastest I've seen was around 2.5
by sachleen
March 3rd, 2012, 4:39 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

can everyone post their scores? our total score for regionals was 220, and we got 3rd place.
Lets get the scores in the score tracker instead. You can post them here too, if you want, but that's really where they should go.
by sachleen
February 27th, 2012, 12:01 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

You could also use the release mechanism to hold the car straight and in the same position every time. Maybe have the flat rear of the car against the mechanism so you really just have to push it up against it and it'll get lined up. Has anyone tried anything like that? Edit: Also, don't you think ...
by sachleen
February 25th, 2012, 6:56 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

That wouldn't necessarily ensure that the vehicle leaves the ramp at the same angle/direction each time though. It's definitely better than nothing, but I still think a guide rail system would be better (however, there is a large amount of friction that comes with a rail system unless the proper ma...
by sachleen
February 25th, 2012, 9:13 am
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

Agreed with Balsa Man; I've only seen a few teams without a "guide rail" system of some sort. Some use tape, others have the guide rails as part of the ramp, etc. Can you explain what you mean by "tape"? I currently do not have guide rail system and I'm looking for a method that is very simple. The...
by sachleen
February 23rd, 2012, 8:10 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

Here's something that SJ posted a while back: On another note, I was thinking about whether a long car or a short car would be better, and while getting the longer car to go straight is easier, a shorter car can have a higher center of mass. My basis for these assertions are that if the mass of the...
by sachleen
February 21st, 2012, 10:44 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

Wow, thanks for the info! =] Do you mean neoprene O-rings as in like... sort of a roller blade wheel, but softer? Like this- http://goo.gl/d4Rgu BalsaMan- How hard do you think it'd be to put a groove on the circumference of a 1/4" thick circle of aluminum on a lathe? Oh wow I didn't know you could...
by sachleen
February 21st, 2012, 11:27 am
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

What type of tires is everyone using? You don't have to say if you want to keep a secret.... Just wondering ;)
I've seen quite a few CDs/mini CDs with balloons wrapped around them.
by sachleen
February 20th, 2012, 3:10 pm
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

When trying to account skid, does it increase the further you go, or does it remain constant at any distance?
Intuitively, I think it would decrease as distance increases but I have no math to back that up.
by sachleen
February 20th, 2012, 9:37 am
Forum: 2012 Build Events
Topic: Gravity Vehicle C
Replies: 805
Views: 79367

Re: Gravity Vehicle C

From what I heard, they decided to make the "rule" about not testing the morning of competition (this was Regionals). They said that we were "potentially getting an advantage", but isn't testing on the same surface similar to taking a practice test for an event? Interesting, without hearing from th...

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