Mousetrap Vehicle C

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Re: Mousetrap Vehicle C

Post by robotman » January 31st, 2011, 5:01 pm

lllazar wrote:Hmm i was wondering how can i reduce the friction between the axle and the car frame?
Add ball bearings
or as primate already suggested Lube it
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Re: Mousetrap Vehicle C

Post by potatochip » January 31st, 2011, 6:03 pm

does anyone know what are the good times people have been getting for their mousetrap vehicles?

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Re: Mousetrap Vehicle C

Post by wonderbread » January 31st, 2011, 6:40 pm

Would anyone mind sharing what kinds of string they use? I'm looking for something that will maintain its initial length even after continued testing (as in, it shouldn't stretch, or at the least, very little)

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Re: Mousetrap Vehicle C

Post by bwy » January 31st, 2011, 7:27 pm

Primate wrote:
lllazar wrote:Hmm i was wondering how can i reduce the friction between the axle and the car frame?
Reduce the point of contact, or lubricate it. Try petroleum jelly for metal/plastic, wax for wood.
Yeah, the wiki has some tips like using plastic spacers to hold the axles (apparently, that was "their secret")
When he says to reduce the point of contact, I'm guessing primate means to use a rounded hole, instead of one that's completely flat where the axle touches it, which saves me around 4 seconds.
I'm not sure how much lubricating it really helps...
wonderbread wrote:Would anyone mind sharing what kinds of string they use? I'm looking for something that will maintain its initial length even after continued testing (as in, it shouldn't stretch, or at the least, very little)
I had that problem too, but any kind of fishing line fixes it.
potatochip wrote:does anyone know what are the good times people have been getting for their mousetrap vehicles?
I'm guessing low in the 8 second range? Has anyone gotten under 8?

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Re: Mousetrap Vehicle C

Post by zcshiner » January 31st, 2011, 8:16 pm

Keeping up the theme, does anyone want to share the weight of their vehicle?

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Re: Mousetrap Vehicle C

Post by illusionist » February 1st, 2011, 3:48 am

zcshiner wrote:Keeping up the theme, does anyone want to share the weight of their vehicle?
My vehicle is at 254 grams (.56 pounds), and I am getting around 9.5-10 seconds for my total run time.
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Re: Mousetrap Vehicle C

Post by austinfhs » February 2nd, 2011, 1:10 am

illusionist wrote:
zcshiner wrote:Keeping up the theme, does anyone want to share the weight of their vehicle?
My vehicle is at 254 grams (.56 pounds), and I am getting around 9.5-10 seconds for my total run time.
Ours is about 240 grams as well, with about the same time.

Any tips on creating a sighting mechanism? I'm just worried about ending up in the middle of the lane, because they're measuring the second distance from the middle of the -4m line, instead of the line in general.

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Re: Mousetrap Vehicle C

Post by starpug » February 7th, 2011, 1:42 pm

wonderbread wrote:Would anyone mind sharing what kinds of string they use? I'm looking for something that will maintain its initial length even after continued testing (as in, it shouldn't stretch, or at the least, very little)
Kevlar String.

For people wondering about times, We're getting 13-14 seconds with our (rather heavy) prototype car with no brakes.
Last edited by starpug on February 7th, 2011, 2:55 pm, edited 1 time in total.
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Re: Mousetrap Vehicle C

Post by robotman » February 7th, 2011, 2:36 pm

wonderbread wrote:Would anyone mind sharing what kinds of string they use? I'm looking for something that will maintain its initial length even after continued testing (as in, it shouldn't stretch, or at the least, very little)
I am using a Kevlar type fishing line which works really well. If your string gets "stuck" beeswax as a lubricant works really well
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Re: Mousetrap Vehicle C

Post by illusionist » February 7th, 2011, 3:37 pm

Doesn't fishing line get tangled easily? I also find it hard to see...
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