So, I'm not discounting the value of a test like this, but since there are so many factors involved with lubrications, I really think I would like to see results from actual cars.
I think what I'd do would be, if I had 3 different lubes to test, build four cars, try to get them as identical as possible (though this is never entirely possible). Use BSA wheels and axles that are machined without crimp marks.
Run each car a number of times without any lube, get the average speed of each.
Lube three of the cars, each with a different lubricant, leave the fourth car as a control. Re-run the same amount of runs with each car again.
I'd want to look for:
- Average speed change from each lubricant.
- Maximum speed change from each lubricant.
- The change in effectiveness of the lubricant over a number of runs.
If you wanted to test with lube + wax, as opposed to just lube, you'd need three more cars.
Now you see the kind of thing I'd do if I didn't have a day job and had the time/money to play with Pinewood stuff all day. /images/boards/smilies/smile.gif
txchemist said:
You might look at different ways to test the ""lubes"
A. Wheel rub to body or axle head, balance wheel on bore and test friction.
B. Wheel rub on inside edge to wood or aluminum track, tape nickle to get wheel to tilt and drag back edge. Aluminum tape is a good sub for the aluminum track- be sure and Pledge the aluminum to get lowest friction. ( unless you know they will never clean the track.)
C. Wheel bore to Axle, coat the mirror in a zone with jjg if that is your last axle coat , polish lip edge and apply your wax or ZAP or wax + Zap or Grizzwald's magic ski wax and then by adding nickles (each is 5 grams close to a 1/4th" cube of tungsten) you can get friction on a light front wheel, and friction on a loaded back wheel.