hello, i really need help on.........................?
549498
Depends on what kind of track you intend to use it on; straight, incline, etc. I doubt that aerodynamics will make a whole lot of difference, but you can try something aerodynamic. I've seen a number of pinewood derbies and I can't say the wedge always has the advantage. If it really made a difference nearly all would tend to win, but they don't. I tend to believe that other factors are more significant. Things like weight and friction. Make the wheels as 'slippery' as possible about the axles. Maybe you can use Teflon bushings for axle sleeves, or Teflon axles  as well as Teflon bushings unless there are restrictions of such things.\n\nAt one time I started to crunch some math to find the optimum design, but I was always derailed on some other endeavor and never finished. It's not a trivial problem actually if I remember correctly. Anyway, I'd say that the weight should be evenly distributed. So balance any added weight with the weight distribution of your body style so the mass is effectively centered width-wise and length-wise.\n\nA light car will leave the gate faster, but the heavier car will not be as affected by undulations and so on on the track, and it will tend to want to continue longer than the light car. How much heavier?........sorry.....dunno. That was part of what I wanted to find out.\n\nIf the cars start on an incline then I'd say the weight distribution should be slightly forward. If the cars are propelled on a level track, depending on the nature of the launching mechanism on the car the weight should be centered as I mentioned above. If the cars are propelled on a straight track from behind, then you'd also want a bit of excess weight slightly forward. If the car is propelled by a sling mounted on the front of the car, then the weight should be situated slightly toward the rear.\n\nThe wheels should have NO slop in them, but completely FREE to turn. The mounting of the axles should also be done just so as well. I'd say this is more in line with how you distribute the weight of the car as a whole. You don't want weight 'hanging' over beyond the outer perimeter of the wheel-base. And don't have it shifted more to one side than another. I doubt you'd do that, but I've seen some pretty crazy designs.\n\nSince you mention motors, I guess you'll be launching from a level surface. Make cavities in the car to lower the motor into to keep it from being too bulky. Selecting the motor is up to you. Find one that has a good power:weight ratio. Meaning.....high power against low weight (that's obvious ---- right?). Power it with good batteries. Don't get the cheap crap from Giant Eagle. Go to a hobby store and get good ones. Measure their voltage and make sure they are at or above their rating, and if you use more than one that they are as closely matched as you can get. Mount the motor as closely to the driven axle as possible. Avoid linkages. This will add weight...unless you have to. maybe consider driving all 4 wheels at once? BUT...they will have to be synced VERY well to pull this off, otherwise the car will fight itself and slow you down. If you need to do any wiring....use very fine gauge wire. Enough to handle the amps needed, but just barely! The finer the wire the less weight you have to haul. Ideally try and engineer the motor so you don't even need wires.\n\nIf you have to connect the motor to the axle with some kind of gearing....I'll come over and bi+ch-slap you for even thinking it......don't do that! Try and use a motor/axle assembly. Otherwise you run a terribly high risk of driving the axle out-of-center and wasting power by unnecessarily torqueing the axle. Meaning as well as turning the axle it will tend to want to rotate....no no no no no....got it?\n\nMake sure any motor you use doesn't have a wild magnetic field. Check it by seeing how many paper clips you can 'stick' to it, and how far away this
491913
im sooo sorry but i cant help u with that.. sorry
434557
Try these.\n\nHope that helps.\n\nGood Luck.
657309
yea man i would need help with this too. hope you get some help from others, good luck
1176943
I am there to help you. You can send me IM or can email me at psbhowmick@yahoo.com. I shall try to solve your questions simply because of my helping nature.
188326
Help with what?????????????
595704
frum de way u rite i think u need a lot of help
364942
Try this.\nHope that helps.\n\nGood Luck.
444282
I need that also...sorry for answring this...but it helped me too. Thanks!
673960
Please visit:\nhttp://www.askmehelpdesk.com/advice/t-17336.html
503988
There you go.\n\nHope this helps.\n\nGood Luck.
957208
Try this link it may be of help
286129
Maybe I can help.\n\nmahc_u00@yahoo.com
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check http://forums.helpmeoutsource.com
1016328
Please get some help!
640127
Try this.\n\nHope it helps.\n\nGood Luck.
285788
call someone smart and ask them for help on it