Search found 506 matches

by MaxV
Fri Aug 29, 2003 10:11 am
Forum: Planning, Preps & Running the Race
Topic: Inspection - Lubricant limitations
Replies: 28
Views: 18316

Re: Inspection - Lubricant limitations

In our race, we just state that excess lubricant must be removed before check-in. So whether liquid is leaking out of the wheels, or the car is covered in graphite dust (this is more typical), the owner must clean off the excess first. By the way, when looking at our track it is obvious that the mai...
by MaxV
Thu Aug 28, 2003 4:38 pm
Forum: Car & Semi-Truck Construction
Topic: Speed impact of various types of lubrication
Replies: 34
Views: 15088

Re: Speed impact of various types of lubrication

Just to clarify, silicon will last much longer than 10 heats. In my tests, even after 20 heats it was still performing better than graphite. However, the effectiveness drops off a tiny bit with each run. So if you are in a race where others are using specialty lubes, I wouldn't recommend it if a win...
by MaxV
Thu Aug 28, 2003 4:18 pm
Forum: Car & Semi-Truck Construction
Topic: Speed impact of various types of lubrication
Replies: 34
Views: 15088

Re: Speed impact of various types of lubrication

Silicon would be used instead of graphite.

Technically it is not a dry lube, as it goes on wet. However, it you apply it per my earlier post, it will certainly not foul the track, and in fact will be much less messy than graphite.
by MaxV
Thu Aug 28, 2003 1:57 pm
Forum: Car & Semi-Truck Construction
Topic: Speed impact of various types of lubrication
Replies: 34
Views: 15088

Re: Speed impact of various types of lubrication

With silicon oil, there does not appear to be a break-in period, but it seems to wear off in an almost linear way. So, the best times occur right away, with a slower time at each subsequent run. For a race with few heats (less than 10), this would be okay. Another liquid lube I tested was just the o...
by MaxV
Thu Aug 28, 2003 11:57 am
Forum: Car & Semi-Truck Construction
Topic: Speed impact of various types of lubrication
Replies: 34
Views: 15088

Re: Speed impact of various types of lubrication

My tests indicate that - all other things being equal - a good thin film lube can outperform graphite by over a car length. As indicated, Gunk-brand silicon spray works well. I imagine the only real difference between this commercial brand and a medical brand is that the medical brand is sterile and...
by MaxV
Sat Aug 16, 2003 11:28 am
Forum: Derby Products and Services
Topic: Lead Weights
Replies: 2
Views: 2769

Re: Lead Weights

If you don't find the Prather lead weight locally, we have the weight at Maximum Velocity. http://www.maximum-velocity.com/segleadsmall.jpg We also have solid lead weight formed as a 3/8" wire, http://www.maximum-velocity.com/leadwiresmall.jpg and tungsten weights formed as cylinders, cubes, beads, ...
by MaxV
Mon Aug 11, 2003 6:27 pm
Forum: Derby Products and Services
Topic: Pro-Body Tool From Maximum Velocity
Replies: 3
Views: 3414

Pro-Body Tool From Maximum Velocity

Pro-Body Tool http://www.maximum-velocity.com/pro-bodysmall.jpg The Pro-Body Tool will improve the performance of pinewood derby cars by: Axle Slot Preparation - Ensuring accurate axle positioning by allowing you to drill accurate axle pilot holes into the existing axle slots with a hand drill. The...
by MaxV
Mon Aug 11, 2003 6:21 pm
Forum: Derby Products and Services
Topic: Pro-Axle Press From Maximum Velocity
Replies: 0
Views: 2613

Pro-Axle Press From Maximum Velocity

Pro-Axle Press http://www.maximum-velocity.com/pro-axlesmall.jpg The Pro-Axle Press will improve the performance of pinewood derby cars by performing three important procedures on nail type axles: Axle Straightening - Ensures accurate wheel tracking by creating absolutely straight axles. Axle Round...
by MaxV
Mon Aug 11, 2003 6:06 pm
Forum: Derby Products and Services
Topic: Pro-Hub Tool From Maximum Velocity
Replies: 4
Views: 2717

Pro-Hub Tool From Maximum Velocity

Pro-Hub Tool http://www.maximum-velocity.com/pro-hub-email.jpg The Pro-Hub Tool is a precision machined device that improves the performance of pinewood derby cars by performing three wheel preparation procedures: Hub Squaring - Ensures accurate rotation by squaring the wheel hub to the wheel bore ...
by MaxV
Mon Aug 11, 2003 5:38 pm
Forum: Car & Semi-Truck Construction
Topic: Inertial and Vibration Losses?
Replies: 37
Views: 21022

Re: Inertial and Vibration Losses?

On a smooth track, I don't believe the suspended weight will provide any benefit. In fact, it could detract, as some energy in the system will go into moving the suspended weight. However, on a rough track the suspended weight may help the car track better (won't get jolted around as much), just lik...
by MaxV
Mon Aug 11, 2003 9:45 am
Forum: Car & Semi-Truck Construction
Topic: A Hub-Axle Treatment Evaluation Protocol
Replies: 33
Views: 11444

Re: A Hub-Axle Treatment Evaluation Protocol

I completed a set of experiments over the summer which I will publishing in the Pinewood Derby Times newsletter over the course of the coming season. Not everyone will agree with the methodology I used, but I believe it provides reasonably accurate results while still being practical to implement. I...
by MaxV
Mon Aug 11, 2003 9:35 am
Forum: Tracks
Topic: BestTrack Review
Replies: 12
Views: 9752

Re: BestTrack Review

Regarding alignment on BestTrack, the pins do make it easy to align. It takes quite a bit of time and effort to get it put together the first time, but after that, it goes together quickly.
by MaxV
Wed Aug 06, 2003 10:28 am
Forum: Car & Semi-Truck Construction
Topic: Axel Diameter: Is smaller really better?
Replies: 29
Views: 16622

Re: Axel Diameter: Is smaller really better?

Hugh's axles are between one and two thousandths smaller in diameter than standard axles. After preparing the standard axles (filing, sanding, polishing), they will be reduced a few thousandths as well. So there really isn't that much difference. The key to remember is that reducing the surface area...
by MaxV
Tue Aug 05, 2003 9:49 am
Forum: Car & Semi-Truck Construction
Topic: How do I drill straight axle holes?
Replies: 17
Views: 10063

Re: How do I drill straight axle holes?

The problem with drilling all the way through the car is that the drill bit is virtually guaranteed to flex, creating a non-straight hole. At the size of a #44 bit, no material will always go straight. That is why I recommend drilling holes only half way through - much less flexing of the bit, and u...
by MaxV
Mon Aug 04, 2003 2:22 pm
Forum: Car & Semi-Truck Construction
Topic: How do I drill straight axle holes?
Replies: 17
Views: 10063

Re: How do I drill straight axle holes?

I don't know exactly how you are using the mill, but many people make the mistake of: - referencing the right side holes to the left side of the block, and - referencing the left side holes to the right side of the block. This only works if the sides of the block are perfectly parallel. Most of the ...