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Old 02-01-2008, 06:26 AM   #1
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Default Option to offset lipo pack?

In looking to setup a second car with a lipo pack the amount of weight that has to be added is insane!

Lead and tungsten seem to be the only option but you need to use way to much of it to get it to work.

Does anyone have any info on other possible material choices that are EXTREMELY HEAVY/DENSE for its size.

With modern touring cars space is a premium.

Some other people have some very clever choices on rctech but I am looking for something less complex. Basically weights about the size of a quarter than can be easily attached/bolted to chassis but small enough to move around to balance the car and work with different packs and chassis.

Any super materials available to do this?

Thanks

Jamie
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Old 02-01-2008, 06:31 AM   #2
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I believe tungsten is as dense as you can get that is somewhat affordable. I cant find the chart of heavy metal density right now though...

With Tungsten is really not too bad.
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Old 02-01-2008, 07:02 AM   #3
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Lead is the only way to go. But the heaviest metal on earth is has to be Uranium which is 75% more dense then Lead. But if I would go out and make a few calls asking where I can buy some Uranium a few guys in a Black Chevy Suburban might decide to stop by my house asking me a few questions.

My car short about 215g when I went LiPo. I’m trying to avoid using Lead so my other alternative was a stick of tool steel and glue it on the side of the pack. Tool steel is very low on carbon so it won’t rust easily.

If you must use Lead, I would go to some wheel or tire shop buying the balancing weight from them. Seal it with CA glue or Epoxy to minimize the lead exposure.

Good Luck.
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Old 02-01-2008, 07:24 AM   #4
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Quote:
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Lead is the only way to go.
Tungsten is superior to lead in every way except cost. Its heavier for the size and not as toxic.
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Old 02-01-2008, 09:03 AM   #5
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Quote:
Originally Posted by or8ital View Post
Tungsten is superior to lead in every way except cost. Its heavier for the size and not as toxic.
Other than Tungsten is not as malleable as Lead. Tungsten is as hard as steel, so the little Tungsten bits are better off as small instead of large.

As for needing to offset the battery, what type of car are we dealing with? What type of LiPo battery are you using?

Most LiPo installations I've seen have the Lead stick-on weights attached to the outer edge of the LiPo battery, not the Top or Front/Back edges. This allows less weight to counter balance the chassis.
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Old 02-01-2008, 09:10 AM   #6
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I get small pieces, CA them together then shrink wrap them. Works really well. Ill try to post pictures sometime.
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Old 02-01-2008, 09:27 AM   #7
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A 1" x 1" x 1" piece of stainless steel weighs .283 Lbs
A 1" x 1" x 1" piece of tungsten weighs .6987 Lbs

you do the math..........
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Old 02-01-2008, 09:49 AM   #8
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Forgot to add there are also lots of options for Tungsten. Do a search for Tungsten weights, Pine Derby, etc... and you will find Tungsten of various types:

Tungsten Cubes
Tungsten Plates
Tungsten Blocks
Tungsten Balls
Tungsten Powder
and ....
Tungsten Fishing Weights

Be sure to watch out for Tungsten alloys. While heavier than lead, the alloys are not heavier than a more pure Tungsten.
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Old 02-01-2008, 10:36 AM   #9
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Where can a person purchase tungsten?
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Old 02-01-2008, 10:38 AM   #10
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Quote:
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Where can a person purchase tungsten?
Just about any pinewood derby site:


http://www.google.com/search?q=tungsten+pinewood+derby
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