Real weight to wood weight

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T-Rex Racing PURE STOCK T-Rex doesn't wanna be fed, it wants to hunt!!! [Mo0:4] Posts: 19	Real weight to wood weight Jun 20, 2010 11:05:01 GMT -7 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by T-Rex Racing on Jun 20, 2010 11:05:01 GMT -7 I was wondering what the ideal amount of "solid" weight a car should have compared to wood weight.
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birel33 Guest	Real weight to wood weight Jun 20, 2010 16:46:52 GMT -7 Quote Select Post Deselect Post Link to Post Back to Top Post by birel33 on Jun 20, 2010 16:46:52 GMT -7 Most of my cars after all body work is complete weigh in around 12-13 grams. I have had a few that are less and a few more but most are in that range. I hope this helps.
	Last Edit: Jun 21, 2010 6:27:44 GMT -7 by birel33

W Racing
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W Racing [Mo0:12]

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Real weight to wood weight Jun 21, 2010 0:26:47 GMT -7

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Post by W Racing on Jun 21, 2010 0:26:47 GMT -7

As long as you have 3.5 ounces of added weight or more you are fine. that being said most of my cars are closer to 4 ounces added weight.

I like to use a 5/16" thick slab for the body to keep it stiff and light. Anything thicker is not needed. Also cars thicker than this can run into problems if the rears are canted...

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T-Rex doesn't wanna be fed, it wants to hunt!!! [Mo0:4]

Posts: 19

Real weight to wood weight Jun 21, 2010 13:55:50 GMT -7

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Post by T-Rex Racing on Jun 21, 2010 13:55:50 GMT -7

Thanks, really excellent advice. I was at about 3.1 ounces so I need to shave a touch off my car. Now having said that what are preferences for weighting, I've used tungsten and melted in lead. Whats the easiest way to get that much weight into such thin cars?

Last Edit: Jun 21, 2010 13:57:34 GMT -7 by T-Rex Racing

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W Racing
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Real weight to wood weight Jun 21, 2010 14:09:26 GMT -7

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Post by W Racing on Jun 21, 2010 14:09:26 GMT -7

Easiest is a tungsten disc. Just drill a one inch hole. I like to drill through the bottom of the car about 1/2" through and then cut the car out. To prevent breaking the car body. lined up between axles is the farthest back you would ever want to go. 1/4" forward the furthest out...

Sweet Spot is my weight of choice. I drill a 1" hole 1/2" through the body. Cut the car and then saw out a square shape. or even drill two holes cut the car and then saw/chisle a rectangular shape for making an adjustable COM weight. Add tungsten putty to get weight correct.

This assumes you can drill axle holes and cut axles PDDR style rules. If you are making a car for something else then let us know.

Cubes also work OK if you group them tight. Not my favorite.

I really do not like the small cylinder weights. They do not make a very good car.

I also like the cars to be slabs with no holes in the middle. If there are holes cover with packing tape...

If Mod the bone shape works ok but I still prefer the slab style...

Best Wishes - W

Last Edit: Jun 21, 2010 14:12:25 GMT -7 by W Racing

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Post Quick Questions and Comments

Vitamin K: pony I'd love to see a video of your putty technique, if you were so inclined. Feb 23, 2018 8:35:34 GMT -7

pony: Don't over heat the axle. I did that once too and I had to resand the axle. Two seconds of the flame is all I did. I hold the axle in the drill chuck, heat it then immediately spin it against the silly putty. I then wipe the axle down by hand. Feb 23, 2018 22:02:58 GMT -7

pony: I do the same technique with the hard ski waxes which I use a lot. You can heat the axle or if you don't want to use the heat just hold the hard ski wax against the spinning axle. Use high speed. The ski wax transfers by friction and the heat of the spin. Feb 23, 2018 22:06:02 GMT -7

pony: Remember though you still need some form of silicone on the axle after the ski wax. Plastics on steel always needs silicone. I don't have the technical know how to do a video and post it. It's the same process as polishing compounds and polishing wheels. Feb 23, 2018 22:09:47 GMT -7

pony: In everyday Cub scout races the Jig or the Max-Pro is good enough. The Silly Putty was only .001 faster. If the Silly Putty feels old and dried out I'd try to get some more and just use the heat of the spinning axle to get it to transfer over to the axle. Feb 23, 2018 23:45:42 GMT -7

corvid: Thanks for clarifying and the additional great info and best of luck racing today! Feb 24, 2018 9:53:58 GMT -7

pony: Has anyone had trouble with their timers? Mine seems to have lost .015 or all my cars are dogs. Feb 28, 2018 7:19:58 GMT -7

Zeebzob: Pony, I would check the gate first. I have found the gate to be a cause of a sudden time discrepancy. Mar 1, 2018 7:54:43 GMT -7

pony: Thanks, Zeeb. I did work on the gate prior to this loss of speed or time. It's the way of the world, you try to fix something and you screw up something else. Mar 1, 2018 8:40:34 GMT -7

pony: Glenn's razor wheels ruled the track at nationals again. Apr 28, 2018 19:14:24 GMT -7

hacksaw: Where is the 2018 race schedule? May 19, 2018 19:08:08 GMT -7

Gone Racing: I agree with Pony. Hard to beat Glenn's razor wheels. Aug 31, 2018 6:33:18 GMT -7

cherokeechuck: Hey al just saying hi and hoping to have a series here soon.... Nov 29, 2018 21:05:36 GMT -7

Gone Racing: Hey Pony! Where you been? Dec 30, 2018 17:58:25 GMT -7

pony: Been working on some writing projects. My sons and I attempt to write screenplays, but haven't sold any yet. No agent. It's tough. Jan 1, 2019 16:32:57 GMT -7

2FAST4U: keep trying eric...

Feb 8, 2019 16:36:43 GMT -7

Vitamin K: Write a screenplay about a big Pinewood Derby race.