Unlimited Experiment.

[BulldogRacing]

This class has me clueless. I'm trying to learn it and figure best way to learn is build, so here is the first attempt at a speedster. I remember wrestling in High school as a Heavy weight. When I was lucky enough to win a tournament I distinctly remember thinking " I won the gold in the Biggest class." I see unlimited s as the fastest of the fast, if you win this no other car in the whole adjournment is faster. Maybe this is why I have had nightmares about this class. It's defiantly a fun build though and hey someones gotta bring in the rear!

 

[GravityX]

Way to step out of the comfort zone. I'm sure you'll be fine. Looks good so far.

 

[cycrunner]

This class has me clueless. I'm trying to learn it and figure best way to learn is build, so here is the first attempt at a speedster. I remember wrestling in High school as a Heavy weight. When I was lucky enough to win a tournament I distinctly remember thinking " I won the gold in the Biggest class." I see unlimited s as the fastest of the fast, if you win this no other car in the whole adjournment is faster. Maybe this is why I have had nightmares about this class. It's defiantly a fun build though and hey someones gotta bring in the rear!

I'm with you Bulldog - I always run poorly in this class and I can't figure it out! I have around two dozen bearings and have sorted them out by the spin test. I ultrasonic clean them - no lube or course, and have used them with my homemade razor wheels and with a set of razors I bought from John to compare to my own, and see no difference at all. My wheels perform just as good as John's I am sure. I get no benefit from his on my cars compared to my own razors so I am puzzled with this whole scenario! This class has the least variables - no prep of axels or bores. It is very important to have a nice light press fit of the two bearings in the wheel bore on both sides. One other BIG important issue in my experience is how the outside bearing plastic retainers fits against the bearings. My experience shows that if the retainer is against the inner race of the bearing it slows down the car - a spin test will show this. So I try to set that plastic retainer just barely off the bearing. Under magnification I try to just see a tiny bit of space between the inner race and the retainer. I have run individual and single axels from John, and check to see if my rears are vertical and are parallel to each other. I run the dominant front 3 to 4 degrees positive cant like in the other classes. I set my COM at 0.5" to 0.7". I have varied the drift on my tuning board and see that around 3 inches at 4 feet works OK and produces he fastest times on my track. So there is something I am missing in my build process - just haven't been able to identify the problem or problems! Like you say I do like to make cars for this class - just disappointed and frustrated!

 

[Kinser Racing]

When you're at the wall, build another car and make a change. It's all that remains.

 

[PushcartDerby]

Good advice Kinser! It's pushing through that makes us better at whatever we do.

 

[Maglev]

CYC - keep the car body weight below 10 grams around 7-8 grams and drop the COM to below 0.25" and see if you pickup speed! Good luck.

 

[Kinser Racing]

Great job Bulldog!

 

[BlewBYu]

Bulldogs should ALWAYS be red and black! Love the colors, man!

 

[cycrunner]

CYC - keep the car body weight below 10 grams around 7-8 grams and drop the COM to below 0.25" and see if you pickup speed! Good luck.

I have never achieved that weight and COM - I will push in that direction!