My co2 Car Project

[iPaintball]

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.

[Fnord]

and it weighed like 3.5g.

3.5 grams is the weight of a penny

[pvcmaster]

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.

[iPaintball]

Oh, my bad, I meant 35 grams. I'm retarded.

[Fnord]

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:)

[pvcmaster]

I like the design, but i cannot see how that thing could weigh 80g unless it was made of hardwood and had steel axles.

[Fnord]

It's made of pine, but the axles are steel, and they and the wheels weigh 30 grams alone.

[jackssmirkingrevenge]

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?

[SpudBlaster15]

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[jackssmirkingrevenge]

for an average velocity of 108m/s

I think you meant 108 feet per second

[SpudBlaster15]

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[pvcmaster]

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.

[jackssmirkingrevenge]

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.

[pvcmaster]

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?

[jackssmirkingrevenge]

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

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