Search found 25 matches

by ironband
Tue Feb 06, 2018 11:57 am
Forum: General Car/Truck Racer Topics
Topic: Fastest Pinewood Derby Car Designs and Pinewood Derby Rules
Replies: 3
Views: 1010

Re: Fastest Pinewood Derby Car Designs and Pinewood Derby Rules

I can’t believe they’re still touting a quick start front as being a speed secret these days! I thought those went out of style when the spring loaded start gates came on the scene? You'd be surprised how many packs are still running a manual start on an older track. We got beat by one of these thi...
by ironband
Fri Jan 26, 2018 12:09 am
Forum: Car & Semi-Truck Construction
Topic: Rear Wheel Camber
Replies: 2
Views: 880

Rear Wheel Camber

Hi all, After our second place finish last weekend, my son and I are already plotting our reven...er...comeback next year. One question I had was with regard to the camber angle on the rear wheel. A lot of the tools out there seem to be set at 2.5 degrees negative camber, and that's approximately wh...
by ironband
Mon Jan 22, 2018 5:54 pm
Forum: General Car/Truck Racer Topics
Topic: Year 3 in the books - excitement, mystery, technology
Replies: 1
Views: 870

Year 3 in the books - excitement, mystery, technology

We had our Pack Pinewood Derby this past Saturday. I was rolling out the new instant replay system as well as my computer integration. There were a few glitches, but for the most part, everything went pretty solidly. My son wanted to focus on getting a shiny finish this year, so we applied multiple ...
by ironband
Mon Jan 22, 2018 1:44 pm
Forum: Electronics
Topic: Raspberry Pi based Instant Replay system
Replies: 4
Views: 2153

Re: Raspberry Pi based Instant Replay system

Hi Ben in SD, Certainly - my code is in the description of this youtube demo: https://youtu.be/-QyMxKfBaAE Here is some video of it in action on an actual track: https://www.youtube.com/watch?v=B3lcQHWGq88&feature=youtu.be Note to get clear video you do have to focus the camera for this distance and...
by ironband
Wed Jan 17, 2018 12:50 am
Forum: Car & Semi-Truck Construction
Topic: Advise me on using slots. :)
Replies: 10
Views: 1765

Re: Advise me on using slots. :)

I've never had great luck with the slots. For the longest time our pack required us to use the slots. I was so glad when we came back and found that the rules had changed. I think that the best way to use the slots is to actually drill holes into the slots. The jig I currently have allows you to ali...
by ironband
Sun Jan 14, 2018 12:28 pm
Forum: Car & Semi-Truck Construction
Topic: Rail Riding - relationship between COM and drift
Replies: 10
Views: 1467

Re: Rail Riding - relationship between COM and drift

It is a nice track. I spent the better part of yesterday with our cubmaster extending the stopping area - over the years the original foam rubber compacted in the box, and previous years' attempts at adding grip tape, sandpaper, and who-knows-what else on top have been ineffective. We built an exten...
by ironband
Sat Jan 13, 2018 9:59 pm
Forum: Car & Semi-Truck Construction
Topic: Rail Riding - relationship between COM and drift
Replies: 10
Views: 1467

Re: Rail Riding - relationship between COM and drift

Ah, that makes sense - thanks for the clarification! We're on a wood track (20 year old Piantadosi, but in pretty good shape).

My daughter's name is Emma - so we'll be rooting for you!

Andre
by ironband
Sat Jan 13, 2018 7:16 pm
Forum: Car & Semi-Truck Construction
Topic: Rail Riding - relationship between COM and drift
Replies: 10
Views: 1467

Re: Rail Riding - relationship between COM and drift

Speedster wrote:
Sat Jan 13, 2018 7:06 am
Always, and I mean Always, the car will drift to somewhere close to 36".
Thanks for the info Speedster - but do you mean 36", as in 3 feet of drift over 4 feet of running? My tuning board isn't that wide...Is this a typo?

Regards,

Andre
by ironband
Fri Jan 12, 2018 8:43 pm
Forum: Car & Semi-Truck Construction
Topic: Rail Riding - relationship between COM and drift
Replies: 10
Views: 1467

Re: Rail Riding - relationship between COM and drift

As you make the COG more aggressive, you need to increase the drift so that there is more pressure on the guide rail to help keep the car going straight. (since there is less pressure on the track itself) OK, I can get behind that. So if at 1.5" we had success with 2" of drift over 4 feet, do you h...
by ironband
Fri Jan 12, 2018 12:48 am
Forum: Car & Semi-Truck Construction
Topic: Rail Riding Question - indenting RR wheel
Replies: 9
Views: 1451

Re: Rail Riding Question - indenting RR wheel

Last year we had a similar situation - 2.5 deg rear axles, 1.5 deg front axle, and no thinning of the front end, though that was just due to poor planning rather than rules concerns. We solved the problem by gapping the rear wheels with a credit card (about 0.030") and gapping the fdw with the kit b...
by ironband
Fri Jan 12, 2018 12:40 am
Forum: Car & Semi-Truck Construction
Topic: Rail Riding - relationship between COM and drift
Replies: 10
Views: 1467

Rail Riding - relationship between COM and drift

Hi all, 'Tis the season! And my cub and I are hard at work on our cars for next weekend's pinewood derby. Last year he wound up with a 1.5" COM on an extended wheelbase 3 wheel rail rider set to about 2" of drift over 4 feet. Racing on a wood track in pretty good condition. He took first in the pack...
by ironband
Sat Mar 18, 2017 9:15 am
Forum: Electronics
Topic: Lasers as better finish-line emitters?
Replies: 3
Views: 1690

Re: Lasers as better finish-line emitters?

I think part of the appeal of infrared or visible light is that it doesn't have to be *precisely* aligned, just aligned enough to get enough light in the hole to keep the phototransistor activated. With the laser approach, you would need to keep precise alignment throughout the race. I'm not saying ...
by ironband
Sat Mar 11, 2017 11:01 pm
Forum: Electronics
Topic: Raspberry Pi based Instant Replay system
Replies: 4
Views: 2153

Re: Raspberry Pi based Instant Replay system

I like the view from the end of the track, looking up towards the start line. I like to see the whole drama of the race, not just the finish, as some cars get a fast start but then get passed in the flat. I like the idea of that, but it makes it hard to see the finish clearly if you aren't a little...
by ironband
Mon Mar 06, 2017 8:37 pm
Forum: Electronics
Topic: Raspberry Pi based Instant Replay system
Replies: 4
Views: 2153

Raspberry Pi based Instant Replay system

Hi all, As some of you know, I've been working on retrofitting my Microwizard P2XL with an Arduino timer for serial communication as well as timing. As an adjunct to that project, I picked up an old Raspberry Pi B+ as well as a V2 PiCamera, and thought it would be cool to interface them with the Ard...
by ironband
Thu Mar 02, 2017 12:08 pm
Forum: Electronics
Topic: Arduino upgrade of Microwizard P2XL
Replies: 15
Views: 3517

Re: Arduino upgrade of Microwizard P2XL

http://www.youtube.com/watch?v=P9TFidUFHKw As promised - electronics and code are working well! Unfortunately the camera module for my Raspberry Pi broke when I tried to put it in an ill-fitting case, so I'm waiting for a new one to come in before I do development on the instant replay. In the mean...