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help bp guys

hillbille
I've got one to scratch your head over, my son is making a pinewood derby car, those little wooden cars boy scouts make, anyway the weight is maxed out at 200 grams. I was going to use 490 round ball I made out of good pure lead for weight. what I really need to know is how many to put in, bottom line how many grams does a 490 round ball weigh?
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7 comments

Date Votes
  • Sky Soldier
    Here ya go.

    http://www.metric-conversions.org/weight/grams-to-grains.htm
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  • hillbille
    just to be sure is a 490 round ball 490 grains or is that cal.?
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  • allen griggs
    That is caliber. It is around 174 grains.
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  • hillbille
    thanks allen
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  • Chief Shaway
    Pound the ball flat. Take your car and some of the flattened balls to the post office. Set the car and the weights on the scale and trim the flat lead till you are at 200. You want your car as close to 200 as you can. Also, get some graphite powder and cover your wheels and axles with it. You will want to trim all of the rough edges off of your axles also. Good luck.
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  • rgerge
    Use pyrodex as your propelent and forget the weights
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  • Odawgp
    quote:Originally posted by rgerge
    Use pyrodex as your propelent and forget the weights


    No, he will need the weight to keep it from flying off the track and killing someone.[^]

    I would think with the weights you should be ok to use pryrodex[8D]
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