Governor weight added! Results

[Quicktimederby]

So before I took my track down I decided to run my governor car a few times to see what it would do with some weight. Here are the results I'll post the videos up once I can get them to up load to photobucket. The car was not tuned at each weight, I just added weight and ran it down.
2 ounces 3.138
http://youtu.be/g6oPd9xIL98
3 ounces 3.057
http://youtu.be/WMka7kwGqNI
4 ounces 3.010
http://youtu.be/nAlv_unqIS0
5 ounces 2.981
http://youtu.be/DnXbZgSNejM
HUGE jump from 2 to 3 ounces. My track I a little slower than the league track. The results almost makes me want to turn this car into a BASX.

 

[GravityX]

That certainly is a large jump in time from 2 oz. to 3 oz. ~ .080 seconds, then .048 and .029, respectively.

Where is the point of diminishing returns, 6 plus ounces...?

 

[Skippy Kicky]

That is some cool data. Thank you for sharing. I remember when I made my dad an outlaw bearing car (weight limit 10 oz) it was not much faster than one of my 5 oz cars. I think after 6, 6.5 the return in speed was very minimal.
I'm thinking of converting my Governer as well.

 

[Chief]

I too will be converting my Governor car but not to BSAX...but rather to the wood pile for the fireplace...or maybe not, it did win me a bearing car WOOHOO!!!!! ThanX QT!

 

[Quicktimederby]

All videos now up.

 

[GravityX]

Joel, thanks for sharing!

 

[txchemist]

Super instructive QT. I include your data and models of two cars, one with the low friction you typically achieve, and the other is the high friction of the Gov class.{ I originally est. 3.065 and after looking at heavy wheels with fenders revised to 3.08}
.
Recall, I said "IF- friction and COM could remain the same, and that is all the hints I will give.

 

[txchemist]

I have turned the data into a friction vs. weight of car ( which is a big oversimplification, but useful anyway) also added typical CUB friction with good axle drilled alignment, but no lube or polish.

This curious change in friction is just like the drop in friction of a rail car when loaded vs. empty Oddly enough, Engineer can get the train moving much easier with a full load than with empty cars.
http://mechanik.tu-berlin.de/popov/publications/PopovKnotheErtzBucher.pdf

Friction coefficient in rail wheel-contacts

as a function of material and loading parameters

 

[txchemist]

Super instructive QT. I include your data and models of two cars, one with the low friction you typically achieve, and the other is the high friction of the Gov class.{ I originally est. 3.065 and after looking at heavy wheels with fenders revised to 3.08}
.
Recall, I said "IF- friction and COM could remain the same, and that is all the hints I will give.

So last year I predicted someone could run a 3.08 and hats off to Down4Derby who nailed the prediction.

Place	Avg Time	Racer	Car#	Car Name
1	Governor	1	3.0808	Down4Derby Racing