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My co2 Car Project

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Unread postAuthor: iPaintball » Sun Oct 14, 2007 5:58 pm

Sweet car, but it's gonna go slow as hell. My car I made in 8th grade Tech Ed won every race we had, and it weighed like 3.5g.
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Unread postAuthor: Fnord » Sun Oct 14, 2007 6:00 pm

and it weighed like 3.5g.


3.5 grams is the weight of a penny :?
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Unread postAuthor: pvcmaster » Sun Oct 14, 2007 6:00 pm

Wow you guys didnt have any regulations did you? 3.5g is less than one of my wheels, what was your car made of? I assume/hope that you meant 35g.
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Unread postAuthor: iPaintball » Sun Oct 14, 2007 6:12 pm

Oh, my bad, I meant 35 grams. I'm retarded.
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Last edited by iPaintball on Sun Oct 14, 2007 6:34 pm, edited 1 time in total.
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Unread postAuthor: Fnord » Sun Oct 14, 2007 6:28 pm

While I'm still online, I guess I'll show off the one I made in 7th grade.
It weighs about 80 grams, and I ended up coming in third (Mine was not the third lightest, but in the end I won 3rd by reaction time).

I guess I should have dusted it off first:)
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Unread postAuthor: pvcmaster » Sun Oct 14, 2007 6:40 pm

I like the design, but i cannot see how that thing could weigh 80g unless it was made of hardwood and had steel axles.
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Unread postAuthor: Fnord » Sun Oct 14, 2007 6:51 pm

It's made of pine, but the axles are steel, and they and the wheels weigh 30 grams alone.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 14, 2007 11:36 pm

_Fnord wrote:While I'm still online, I guess I'll show off the one I made in 7th grade.
It weighs about 80 grams, and I ended up coming in third (Mine was not the third lightest, but in the end I won 3rd by reaction time)


Do the regulations specifically ask for wooden construction? If now, why not carve it out of blue foam? Or have a simple carbon fibre or aluminium tube construction as per the attached concept?
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Unread postAuthor: SpudBlaster15 » Mon Oct 15, 2007 12:02 am

The CO2 car that I built in grade 7 for my Mechanics 10 class was literally a stick with wheels. I made it down the 70 foot track in 0.65 seconds for an average velocity of 108ft/s. I'm not sure where it went, but if I find it, I will snag a picture and post it here.
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Last edited by SpudBlaster15 on Mon Oct 15, 2007 1:36 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 15, 2007 1:02 am

for an average velocity of 108m/s


:shock:

I think you meant 108 feet per second ;)
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Unread postAuthor: SpudBlaster15 » Mon Oct 15, 2007 1:35 am

Yes, I of course wasn't thinking when I listed the units. :?
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Unread postAuthor: pvcmaster » Mon Oct 15, 2007 8:07 pm

I am going to start painting soon. Any tips? I was planning on applying two coats of sanding sealer, and then painting directly on top of that, and finishing with a clear coat. what do yall think. I need to keep it light, im already at 62g.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 15, 2007 11:37 pm

Before you paint it, i think you can afford to "add more lightness", that body can afford to be hollowed out more, even if you just flip it over and go crazy with a drill to create a honeycomb like structure, then sheet the bottom over with 1/32" balsa or similar.
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Unread postAuthor: pvcmaster » Tue Oct 16, 2007 5:01 am

I've milled it out a lot more since the pictures, but there is only so far that I can go. My car weighs 62g right now, so i can only take off a couple more grams considering the weight of the paint before I get disqualified. I cant add any wood to the bottom either, but that would reduce drag. Thanks for the tips though.

so my painting plan sounds good?
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 16, 2007 5:16 am

The body of the model shall be one piece all-wood and no parts such as body strengtheners, plastic canopies, exhausts, or air foils may be glued or attached to OR enclosed within the dragsters. Air foils, fenders and other appearance are designed and engineered into the original body blank. Bearings and "dry" lubricants may be used in the construction.


I didn't realise the rules were so restrictive :shock:

Your painting plan sounds good, make sure the final effect is highly polished to cut down on drag.
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