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Post by Derby Monkey on Feb 6, 2008 8:30:16 GMT -6
This may have already been addressed on this forum but I didn't see it anywhere...
I've been building my cars with drilled axle holes, extended wheel base and the left front wheel off the track. So, the three wheels running on the track are the two rear and the right front.
Does it make sense to put a little more weight on the right side of the car so that more weight is on the running front wheel. It seems like this would assist in alignment.
The first time I heard this, it was referred to as the weight triangle. If you draw an imaginary line between the weight bearing wheels it forms a triangle. Then make sure all of your weights are placed inside that triangle.
Have any of you tried this?
What do you think?
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Post by DrT1010 on Feb 6, 2008 12:25:24 GMT -6
Do a search on WarpSpeedinc. and offset body. A couple years ago he designed his sons district car with offset weight, concentrated but placed more towards right rear. Several advantages if I recall correctly, added stability with weight further in triangle, easier alignment required to RR with less torsional stiffness required to hold that alignment. Lighter front end with more aggressive set ups possible. For pic see: pinewoodp.proboards29.com/index.cgi?board=Pictures&action=display&thread=1141570818 |
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Post by Derby Monkey on Feb 6, 2008 16:12:27 GMT -6
OK.... If we distribute more weight on the right front... aren't we also shifting more weight to the right rear?
And if so, will this create handling problems?
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Post by DrT1010 on Feb 6, 2008 17:03:39 GMT -6
Much to the contrary! It's fundamental design has an inherent ease of alignment and results in better handling! I won't pretend to be well versed in all the physics, but it relies on the weighting of the moment arm. According to Warp it evens the weight across the rear wheels and evens out the rear friction coeficients, thus requiring less adjustment to achieve proper alignment. If he still frequents this board maybe he can explain in more detail than I can relying on memory and some scribbled notes from years past.
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Post by roosclan on Sept 27, 2008 11:51:48 GMT -6
Do a search on WarpSpeedinc. and offset body. A couple years ago he designed his sons district car with offset weight, concentrated but placed more towards right rear. Several advantages if I recall correctly, added stability with weight further in triangle, easier alignment required to RR with less torsional stiffness required to hold that alignment. Lighter front end with more aggressive set ups possible. For pic see: pinewoodp.proboards29.com/index.cgi?board=Pictures&action=display&thread=1141570818Well, his photos are gone, and he hasn't logged on since August. I'm thinking of doing this for the Dad's race next April, and one of my boys wants to do it, too. Does anyone else have pics of their offset body cars? |
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Post by DerbyDoc.com on Sept 27, 2008 14:50:29 GMT -6
Do a search on WarpSpeedinc. and offset body. A couple years ago he designed his sons district car with offset weight, concentrated but placed more towards right rear. Several advantages if I recall correctly, added stability with weight further in triangle, easier alignment required to RR with less torsional stiffness required to hold that alignment. Lighter front end with more aggressive set ups possible. For pic see: pinewoodp.proboards29.com/index.cgi?board=Pictures&action=display&thread=1141570818Well, his photos are gone, and he hasn't logged on since August. I'm thinking of doing this for the Dad's race next April, and one of my boys wants to do it, too. Does anyone else have pics of their offset body cars? I tried to find some pics of Warps cars, but I couldnt find any that were offset. Heres what his cars look like. The offset bodies that he had looked the same except for the thick part of the body was offset to one side. I was able to see them up close a few months ago, and theyre all very cool.    |
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beakerboysracing
Head in the Pine
You can pick your friends, you can pick your nose, but you can't flick your friends across the room.
Posts: 167
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Post by beakerboysracing on Sept 27, 2008 16:28:46 GMT -6
I think these are the pics you are talking about.   See ya Scott Beakerboys |
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Post by roosclan on Sept 28, 2008 9:40:35 GMT -6
I think these are the pics you are talking about. See ya Scott Beakerboys Those would be it! Thank you! Does anyone else have different offset designs they would be willing to share? |
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Post by 3cubdad on Sept 28, 2008 20:19:29 GMT -6
Thought I'd add a couple of items: One correction from above, when trying to offset the weight, you're not trying equal the weight on all three wheels, that would give you a COM a lot more forward than you would want, (ie SLOW), but what your may be interested in is in trying to equalize the weight carried by each rear wheel. It really does not affect friction, or steering, (there's a lot of physics there), but it can and does affect stability. If you want to see a full description and a better understanding of what is happening and how much to move it check this thread: pwdracing.proboards91.com/index.cgi?board=weight&action=display&thread=754&page=1#5576(it's pretty long so I didn't want to copy it all over to this post!) 3CubDad |
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Post by roosclan on Oct 11, 2008 22:11:51 GMT -6
Thought I'd add a couple of items: One correction from above, when trying to offset the weight, you're not trying equal the weight on all three wheels, that would give you a COM a lot more forward than you would want, (ie SLOW), but what your may be interested in is in trying to equalize the weight carried by each rear wheel. It really does not affect friction, or steering, (there's a lot of physics there), but it can and does affect stability. If you want to see a full description and a better understanding of what is happening and how much to move it check this thread: pwdracing.proboards91.com/index.cgi?board=weight&action=display&thread=754&page=1#5576(it's pretty long so I didn't want to copy it all over to this post!) 3CubDad That was very helpful. Thank you! My oldest wants to try a triangle car, but he wants lots of space for painting flames. I've been toying with the idea of building a triangle car as flat as possible and covering the top with a sheet of thin brass that I found at Hobby Lobby. It is strong and thinner and lighter than the basswood I've found, so it shouldn't throw off the weight too much. The problem will be in figuring out how to get the 80/20 balance in the rear and also get it weighted to the right with a very thin, flat design so the brass sheet will lay flat. Hopefully I won't go through too many pine blocks figuring it out before I teach my son how to do it! |
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