Derby Talk

I hope this works - first time posting pics. Mom and Dad's cars are not started yet and given the variance in the rules, we are likely starting over for our Cub. My little girl's entry, from our pack race. "Layla" build info; DerbyWorx Precision Stock Wheels ~ 2.4 grams Maximum Velocity 40...

Now I know there are many multiple factors in play such as the other cars were faster than test day, we didn't do something properly during the prep process, yada, yada, yada. But what brought the question to mind is I know the other cars axles weren't prepped to the degree, meaning to the fine gri...

xanthrum, Any chance of having an open scouts - graphite only class? (I am pretty sure GPRM would let you do this with a sub group?) My scout wants to run, but I have heard that oil when done right will beats the pants off graphite. No sense in sending the soldier in with 3 flat tires - our council/...

Our pack has a fastest of the pack travelling trophy. There are many name plates on it and the fastest of the pack each year gets it till next year and gets their name engraved on one of the tags on it.

Heat should be fine and that is what my plan is for next time. Just be sure to avoid the fumes. You will not get them hot enough to melt.

My first teardown consisted of two pair of pliers and a knife to scrape them clean.

The thought of short screws in the handles with so much weight scares the heck out of me.....so here was my big upgrade. I used 1/4-20 bolts with T nuts on the inside to hold the handles - don't think there will ever be a problem there...and I can sleep better knowing there will never be a smashed t...

My family is looking forward to sending in some cars. I got a nudge from Sporty and discussed it with my son and he was excited about doing it, so we are planning to be in. It also looks like the other top gear team (Wolf) from our pack is also planning to get in on the action now after a nudge from...

Yes. I think they can. They lack a tuning board and track though. Used a little guided learning with some hypothesis that the times would be faster based on tuning board rolls. I suggested adjusting back wheels first but they wanted to do front. We got it set to about 2.5 in 4' and then we ran it an...

A couple of observations: 1. On a 3-wheel car with well centered CM (which is what I think was described), the off-side wheel (on the side opposite the DFW) will carry 1/2 the car's weight. The other two wheels (the DFW and the wheel behind it) will share the other half. The division will depend on...

I have been lucky enough to get a test track setup with a timer and I am wondering if there is somekind of calculator or information to determine theoretical best time and realistic times and what distance the time equates to. I found this old topic http://www.derbytalk.com/viewtopic.php?f=11&t=...

Whoda,

Math looks good - label looks wrong - maybe it's just the formatting of the post.

600 FPS = 409 MPH (Miles Per Hour)

Wow these Best Tracks sound finicky!

I'm sure glad our pack has a Freedom Aluminum track. We haven't had any of these issues with it.

Would seem that one of these might be readily adapted to work?

Or you could incorporate something similar into your track with 2 sensors.


https://youtu.be/xVrR7ZFBV0o

A Chronograph.

Whoda,

Bravo! Bravo!

I love it!

This looked like a good place to post this instead of starting a new thread. Initial roll test after drilling uncut block. Only 3 wheels on block, with half of an axle press on the back of it for weight. 2 Rears canted 1 to 1.5 degrees / \ 1 Front straight -- Car rolls straight on flat surface. Goin...