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Post by krubcire on Jan 31, 2008 12:24:18 GMT -6
in are troop we have to use the pre slotted block with the short end as the front. there is enought room in the back to add anouther set of wheels. by doing this i would be able to move the weight back further on the car but have more wheels touching. i have to use the 4 stock wheels but the extra wheels can be what ever i want. do you thing my car will go faster with the more wheels but the weight further back?
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Post by ProQuest on Jan 31, 2008 14:38:23 GMT -6
That is a great question!!!!!
The answer: It depends. Do all 4 of the original wheels have to touch? If not you could have the 2 wheels that are farthest back touching and the 2 wheels in the back slots raised. Also, are you allowed to use lightened wheels?
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Post by krubcire on Jan 31, 2008 19:19:42 GMT -6
you have to have 3 of the original wheels touching. the 2 i add can be what ever i want.if i do this i think all 4 in the back would touch just so i do not have a problem with the judges. the ones in the front could not touch. or maybe just add one extra wheel in the back?
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Post by pack459 on Feb 5, 2008 19:08:09 GMT -6
This sounds counterintuitive to what I've heard. I hear that the idea is to have less fricton so adding more wheels that touch the track would increase the friction rather than reduce it. I think that's why three wheels are so popular.
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Post by ProQuest on Feb 5, 2008 23:54:34 GMT -6
Pack459:
You are right that the more wheels that touch the track the more friction there will be. But it is also true that the farther back you move the weight the more momentum the car will have when it hits the flat and therefore the longer it will sustain its speed. I calculate that having a second set of wheels moved as far back as you can get them would allow you to move the cog back approximately 1.15". So the question is whether the speed gains from moving the cog back 1.15" be greater or less than the speed lost caused by having an extra wheel or two touching the track. The question gets particularly interesting if you consider using RSN wheels (s with needle axles) as the second set of rear wheels.
Krubcire,
My guess is that you don't come out a head with the second set of wheels. In addition to the additional friction, you will have an alignment nightmare. Aligning a car is hard enough with three wheels. I can't imagine trying to get it right with five. But having said that, there is only one real way to find out for sure, and that is to try it.
Let us know what you decide, and how it goes.
ProQuest/Steve H.
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