Search found 29 matches

by ironband
Mon Feb 11, 2019 7:48 pm
Forum: Car & Semi-Truck Construction
Topic: Advice on modifying car for districts please
Replies: 6
Views: 343

Re: Advice on modifying car for districts please

That's a good point - in my experience using a 1.5 degree bend will allow for migration and steer while the wheels still "ride flat". If the rule prohibition is against bent axles, then you might not go this way, but if the rules just say that the wheels have to "be flat" then that might be a way to...
by ironband
Mon Feb 11, 2019 9:57 am
Forum: Car & Semi-Truck Construction
Topic: Advice on modifying car for districts please
Replies: 6
Views: 343

Re: Advice on modifying car for districts please

A few things here: 1. Revell wheels are heavier than their BSA counterparts, and therefore slower on a normal sized track. 2. Revell axles, while having a better surface finish, are smaller than their BSA counterparts, and therefore slower than a properly prepped BSA axle. 3. Most BSA axles have a s...
by ironband
Mon Feb 11, 2019 9:42 am
Forum: General Car/Truck Racer Topics
Topic: Prepping for districts
Replies: 6
Views: 215

Re: Prepping for districts

Hi DCDAD, Awesome - I wish we had a district race to go to here...I might have to see about putting one on. It is absolutely worth it to sort through wheels and find the ones with the least runout. I did the same with my son this last race, and had him sort our wheel collection into good (less than ...
by ironband
Fri Feb 08, 2019 4:28 pm
Forum: General Car/Truck Racer Topics
Topic: Changed axles cant get 4 wheels on ground
Replies: 8
Views: 217

Re: Changed axles cant get 4 wheels on ground

Usually 4 wheels touching means 4 wheels touching on a flat surface (granite or sheet of glass or equivalent). Axles aren't always perfectly straight. I'd try rotating the offending axle about 15 degrees at a time and see if I could get it to touch. Hopefully that does it. If it doesn't, you might p...
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: 1338

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: 1160

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: 1146

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: Other
Topic: Raspberry Pi based Instant Replay system
Replies: 4
Views: 2654

Re: Raspberry Pi based Instant Replay system

Hi Ben in SD, Certainly - my code is in the description of this youtube demo: https://www.youtube.com/watch?v=-QyMxKfBaAE Here is some video of it in action on an actual track: https://www.youtube.com/watch?v=B3lcQHWGq88 Note to get clear video you do have to focus the camera for this distance and m...
by ironband
Wed Jan 17, 2018 12:50 am
Forum: Car & Semi-Truck Construction
Topic: Advise me on using slots. :)
Replies: 10
Views: 2223

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: 1980

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: 1980

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: 1980

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: 1980

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: 1877

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: 1980

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...