Does anyone remember a post on any of the boards that had the charts for Com vs DFW Weight for 5" & 5 1/4" wheelbases.
Com vs DFW Weight Chart
- Thread starter Old Geeezer
- Start date
I think it is on this board...http://forums.derbydad4hire.com/post/COM-vs-Weight-in-ounces-on-front-wheel-5598190?pid=1272726671#post1272726671
Here is this post. Let me know what changes you need and I should be able to add to the post.
Here is this post. Let me know what changes you need and I should be able to add to the post.
Thanks W, Could you run numbers for a 5" & 5,25" wheelbase for eliminator or unlimited class cars. Also any idea why the right rear is about 0.32 oz lighter on all my cars. weight is always equally spaced left to right.
Ken
Ken
I will add those. Does anyone else have anything else they would like to see?
THe diffrence in weight on the rear wheels is as follows:
Simple version:
On the non-DFW side the weight on this wheel is weight of car/2
On the DFW side the weight of the rear is equal ((weight of car)/2) - Weight on DFW.
Less simeple version. (Weight of car and raised wheel) - (weight of three wheels that touch). Use that as the weight of the car and calculate things out and then add in each touching wheel in the proper place.
THe diffrence in weight on the rear wheels is as follows:
Simple version:
On the non-DFW side the weight on this wheel is weight of car/2
On the DFW side the weight of the rear is equal ((weight of car)/2) - Weight on DFW.
Less simeple version. (Weight of car and raised wheel) - (weight of three wheels that touch). Use that as the weight of the car and calculate things out and then add in each touching wheel in the proper place.
- Nov 24, 2011
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I'm going to give my opinion here if anyone wants it or not. It doesn't matter that much. 5 ounces is 5 ounces. A third of an ounce more on one wheel will not make much differance if at all. The friction is the same. If you think that much more friction on one wheel is going to make a difference, keep after it, crunch the numbers, and worry about it. I personally think your wasting your time.
Build the car and adjust the weight around a little until you get your fastest time, it's really not rocket science. Don't make it so. That's just my two cents. I have no idea what my COM on my cars are, nor do I know what weight each wheel holds and the results speak for themselves. Build and tune man. /images/boards/smilies/thumb.gif
Build the car and adjust the weight around a little until you get your fastest time, it's really not rocket science. Don't make it so. That's just my two cents. I have no idea what my COM on my cars are, nor do I know what weight each wheel holds and the results speak for themselves. Build and tune man. /images/boards/smilies/thumb.gif
Thats funny!! I was thinking the same thing, I have no real idea of what my COM is. Just know were I had to place the weight to get her moving.
Kinser Racing said:
It is true once you have a build that works then the cars just seem to work...
This is for geeks that like to calculate things. It also helps if you are going into a new class and are looking for a starting point using what works in the old class. If folks are willing to share a picture of the bottom of their car with weights exposed and the steer over 4 ft it would be helpful for those without a track...
This is for geeks that like to calculate things. It also helps if you are going into a new class and are looking for a starting point using what works in the old class. If folks are willing to share a picture of the bottom of their car with weights exposed and the steer over 4 ft it would be helpful for those without a track...
Kinser Racing said:
Don't get me wrong I am sure there is value in it, unfortunately I am no where near the techie #'s type. There is no doubt in my mind that that a perfectly balanced car will be faster than a unbalance one. As far as a weight placement picture I have no issue with a picture because from what I have learned about this hobby you can try and duplicate all you want but until you can spend some serious time on a track adjusting and trying new things you will always have a disadvantage. Pictures for me most times than not will miss lead and send me in the wrong direction.
W racing said:
There is a lot you can learn from pictures of the fastest cars. It helps to be racing against them. If they beat you it really drives home the various car designs etc... Grabbing a great car design will lesson the learning curve. Also with numbers you can build a car with the correct COM the first time instead of guesing at it...
If the top racers showed you how they built their cars would you take them up on it?
If the top racers showed you how they built their cars would you take them up on it?
[font="times new roman, times, serif"]I guess for me I see both sides of this discussion. On one hand, some say that it is not all that scientific...on the other hand some say it is...I like to tell my students that "everything is easy, once you know how". With that said, if I had the opportunity to have some of the top builders take me by the hand and show me how they built there #1 racecar, would I? Maybe, and maybe not...Just because one person can do something and do it well does not mean that another can duplicate it. For example, I can paint Xtremely well, however, for my car to win it needs to be pink and it needs to have a 40 foot head start. haha! Pictures on the other hand can do just as much harm as they can help...to get the idea of something, yes Definitely...but how to do something, probably not so much. Also, I want the satisfaction of figuring out how to be faster by doing my own R&D and trials and failures and successes...I dont want it just handed to me...That takes all the fun out of the end result! Thank you to those not showing piX of their car!! I do want to see them, But I dont want to see them.
[/font]
This thread has been updated wth two more posts:
http://forums.derbydad4hire.com/post/COM-vs-Weight-in-ounces-on-front-wheel-5598190?pid=1272729698#post1272729698
Let me know if you need anything diffrent.
http://forums.derbydad4hire.com/post/COM-vs-Weight-in-ounces-on-front-wheel-5598190?pid=1272729698#post1272729698
Let me know if you need anything diffrent.
- Nov 24, 2011
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