Search found 51 matches

by mossk
Tue Apr 24, 2007 11:47 am
Forum: General Car/Truck Racer Topics
Topic: New Tool Suggestion
Replies: 32
Views: 11483

Re: New Tool Suggestion

I am pleased that people like the photo, however, the photo is copyrighted and cannot be used without permission. Generally, I grant permission for non-commercial use as long as the copyright and website information is maintained.
My apologies as well, I should have check with MaxV first.
by mossk
Mon Apr 23, 2007 7:34 pm
Forum: General Car/Truck Racer Topics
Topic: New Tool Suggestion
Replies: 32
Views: 11483

Re: New Tool Suggestion

The problem we had is we had five cars with the Pro Ultra Light Speed Wheels (1.0 grams) and at least one car with the Ultralight speed wheels (2.2 grams). It was very easy to see the 1.0 grams wheels and easy to me to see the 2.2 gram wheels. I cannot visually tell the difference between 3.6 and 3....
by mossk
Mon Apr 23, 2007 12:49 pm
Forum: General Car/Truck Racer Topics
Topic: New Tool Suggestion
Replies: 32
Views: 11483

Re: New Tool Suggestion

Stan, I guess you could come up with some sort of jig that would hold the car off the scales while letting the wheels hang since there is a little slack between the wheels and the axles. But since everyone has puts the axles in the slots (we have to use the slots) at a different hight it would have ...
by mossk
Mon Apr 23, 2007 12:24 pm
Forum: General Car/Truck Racer Topics
Topic: A few bad apples at the district
Replies: 31
Views: 12858

Re: A few bad apples at the district

Our district it good about communicating with the packs with the rules ahead of time. The district rules also say it is up to each pack to come up with a set of rules but if they advance anyone to the district then they must abide by the district rules. So they strongly suggest each pack adopts the ...
by mossk
Mon Apr 23, 2007 12:15 pm
Forum: General Car/Truck Racer Topics
Topic: New Tool Suggestion
Replies: 32
Views: 11483

Re: New Tool Suggestion

I was thinking of a more definitive tool. Either pass or no-pass. You obviously can’t weigh the wheels once they are put on the car. A caliper would be fine but a good one would cost a lot of money – but a simple piece of metal (maybe aluminum) with a pre-cut slot in it could be sold very inexpensiv...
by mossk
Mon Apr 23, 2007 11:36 am
Forum: General Car/Truck Racer Topics
Topic: New Tool Suggestion
Replies: 32
Views: 11483

New Tool Suggestion

Our rules are very specific when it comes to wheel modification. I’ve seen several vendors have 3.3 gram wheels, 2.2 and 1.0 gram wheels (the standard BSA wheels are 3.6 grams). Our rules state you can do some light sanding to remove the mold mark but you may not remove any significant amount of mat...
by mossk
Mon Apr 23, 2007 11:24 am
Forum: General Car/Truck Racer Topics
Topic: A few bad apples at the district
Replies: 31
Views: 12858

A few bad apples at the district

We had our district race this past weekend. I was disappointed in how many parents tried to cheat to get their son to win. By my estimation 10-15% or more tried to violate the rules. I can understand being over the weight limit since a lot of scales are different and I’m not talking about the five o...
by mossk
Thu Apr 12, 2007 9:55 am
Forum: General Car/Truck Racer Topics
Topic: Our first Pinewood Derby
Replies: 10
Views: 4324

Re: Our first Pinewood Derby

The thing I noticed was there were several boys jumping over the track just before the cars were released.
by mossk
Fri Feb 16, 2007 7:53 am
Forum: Tracks
Topic: How to tell if you have a "Slow" Lane
Replies: 16
Views: 13019

Re: How to tell if you have a "Slow" Lane

Noted that at least the t-test required assumption that the populations had "normal distribution". Does limiting the sampling to "faster cars" provide such a distribution. My observations of car times is that they do not satisfy the definition. Is there a test that can be applied to justify the ass...
by mossk
Fri Feb 16, 2007 7:41 am
Forum: Tracks
Topic: How to tell if you have a "Slow" Lane
Replies: 16
Views: 13019

Re: How to tell if you have a "Slow" Lane

The way to do this assuming normality is to put the data in a regression model along with a variable that would identify each car. Using all the data available should increase the accuracy (power) of your model. But you have to realize different cars my act different in each lane. For example, you m...
by mossk
Wed Feb 07, 2007 10:00 am
Forum: Car & Semi-Truck Construction
Topic: Wheels
Replies: 10
Views: 2918

Re: Wheels

I understand about rolling vs sliding down the track...But would you want to polish the inside edge of each wheel or at least the dominate wheel if you have a 3-wheel rail rider? This would be the part that touches the guide strip.
by mossk
Thu Jan 25, 2007 12:23 pm
Forum: Car & Semi-Truck Construction
Topic: Wheel Wobble
Replies: 30
Views: 10152

Re: Wheel Wobble

I use the other end of a drill bit. I have a dedicated drill bit that I prepared the same way I prepare the axles all the way down to polishing with Mothers. I touch up the drill bit between reaming with mothers so nothing accumulates on it. You want to be sure you don't introduce scratches to the b...
by mossk
Thu Jan 25, 2007 8:33 am
Forum: Car & Semi-Truck Construction
Topic: Rail riding compromise
Replies: 16
Views: 6218

Re: Rail riding compromise

Our rules state "The car must have 1 ¾” clearance between the wheels". So I think as long as you have enough play in the wheels a 1/16 of an inch would pass. The confusion might be that rules don't say where the clearance is measured at (between the hubs or edges of the wheels). I know they use the ...
by mossk
Wed Jan 17, 2007 9:48 am
Forum: Car & Semi-Truck Construction
Topic: COG in relation to CM
Replies: 16
Views: 4719

Re: COG in relation to CM

I wonder if placing weights below the axle plane moves the COM below the axle plane. You have to consider the rest of the car. The only way to test this is to balance the car on the side (the same way you would balance car to determine the COM in relation from front to back of the car). I haven’t se...
by mossk
Fri Jan 12, 2007 12:33 pm
Forum: Derby Products and Services
Topic: New BSA wheels - Siren
Replies: 2
Views: 2224

New BSA wheels - Siren

Hi, I noticed a new wheel in the BSA catalogue. This one makes a siren noise when a button is pressed. Can these wheels be used as a normal wheel or are they only ornamentation that can be added to the car as a fifth wheel? http://www.scoutstuff.org/BSASupply/ItemDetail.aspx?ctlg=05NDC&ctgy=PRODUCTS...