Search found 1072 matches

by Vitamin K
Tue Mar 20, 2018 6:42 am
Forum: Car & Semi-Truck Construction
Topic: Aggressive COG limits
Replies: 11
Views: 856

Re: Aggressive COG limits

Hi Vitamin K. Thank U for your input and valuable insights! Let's say we are on a best track. Decently set up with good seams. Rear is balanced left-right and aligned properly. 130.5g in rear and 12.5g on DFW with 4.5" of drift in 4', theoretically. Is that pushing limits for BSA stock materials? W...
by Vitamin K
Mon Mar 19, 2018 6:31 pm
Forum: Car & Semi-Truck Construction
Topic: Aggressive COG limits
Replies: 11
Views: 856

Re: Aggressive COG limits

The track matters too. Not only aluminum vs wood (the smoother the track, the more aggressive your CoG can be), but also the shape of the curve. The curve of a Besttrack is a lot more brutal than that of a Microwizard. A lot of cars come out of the transition with some serious waggles on the former.
by Vitamin K
Fri Mar 16, 2018 2:01 pm
Forum: Electronics
Topic: Cheap (still unpolished) timer
Replies: 1
Views: 384

Re: Cheap (still unpolished) timer

This is pretty cool! Where in the docs would I see the assembly schematic?
by Vitamin K
Fri Mar 16, 2018 12:56 pm
Forum: Software
Topic: GPRM v17, UX suggestion
Replies: 1
Views: 323

GPRM v17, UX suggestion

This is minor, since I think most people probably just import from spreadsheets, but... In the registration screen, when you're entering a racer, it would be nice if, in addition to just a "Save" button, there was a "Save and Add Another" or maybe just an "Add Another" checkbox to tick, so that it w...
by Vitamin K
Fri Mar 16, 2018 10:58 am
Forum: Software
Topic: GPRM on Linux?
Replies: 2
Views: 295

Re: GPRM on Linux?

Ah well, bummer that. Thought I'd ask.

I find Wine to be so fiddly, it's usually easier just to pop open a VM. :)
by Vitamin K
Fri Mar 16, 2018 9:53 am
Forum: Software
Topic: GPRM on Linux?
Replies: 2
Views: 295

GPRM on Linux?

So, it looks like the latest version of GPRM is built on PyGTK?

Would it be possible to create a build that runs on Linux? Even an unsupported version?

Would be nice to be able to view/edit race files without needing to spark up my VM.
by Vitamin K
Tue Mar 13, 2018 12:02 pm
Forum: Car & Semi-Truck Construction
Topic: Brand new to forum and pinewood derby
Replies: 15
Views: 1155

Re: Brand new to forum and pinewood derby

Hi Sloroller, welcome to Derby Talk! It really sounds like you've done a lot of homework, prior to your son's first build! Congratulations on your wins! I don't know that anyone could guarantee you a 3.0 or less, since tracks vary a lot. That said, I'm sure we could offer advice. Maybe a good starti...
by Vitamin K
Mon Mar 12, 2018 8:09 am
Forum: General Car/Truck Racer Topics
Topic: Starting position for rail riding.
Replies: 7
Views: 628

Re: Starting position for rail riding.

Good question, and I don't have a good answer. This might be a good one for some of the league racers who stage 100's of cars a day for a race.
by Vitamin K
Sun Mar 11, 2018 6:54 am
Forum: Car & Semi-Truck Construction
Topic: One half inch Center of Gravity
Replies: 3
Views: 433

Re: One half inch Center of Gravity

On a smooth track with a good rail-riding alignment, 1/2" CoG is pretty standard these days, I'd say.
by Vitamin K
Sat Mar 10, 2018 5:46 am
Forum: Car & Semi-Truck Construction
Topic: Graphite on wheel tread
Replies: 4
Views: 456

Re: Graphite on wheel tread

The only time I'd want a slippery tread is if I were building a 4-wheel-touching rail rider, and I wanted minimize the traction of the 4th wheel as much as possible.
by Vitamin K
Tue Mar 06, 2018 1:10 pm
Forum: Car & Semi-Truck Construction
Topic: ZEP DRY GRAPHITE???
Replies: 8
Views: 808

Re: ZEP DRY GRAPHITE???

Anything liquid combined with graphite I have read will alter the way graphite slides in microscopic plates over itself. Liquid anything will seemingly alter graphite's effectiveness. Stick with Derby Dad for Hire graphite ranked #1, or Hob-e-lube with Molybdenum added to it ranked #2. Ranked #1 by...
by Vitamin K
Mon Mar 05, 2018 9:15 am
Forum: Car & Semi-Truck Construction
Topic: Burnishing wheel bores with graphite
Replies: 6
Views: 1203

Re: Burnishing wheel bores with graphite

When we have to use graphite (not as often these days, thank goodness), we burnish with a metal rod (one of those straight axles from the Pinecar kits works well). In order to keep from distorting the wheel bore, I get a foam rubber pad that we use to press the wheel into as we roll it.
by Vitamin K
Fri Mar 02, 2018 5:08 pm
Forum: General Car/Truck Racer Topics
Topic: First pinewood derby experience!! And now a few questions...
Replies: 25
Views: 1688

Re: First pinewood derby experience!! And now a few questions...

If you're getting migration to the axle head both forward and back, you're probably pretty good.
by Vitamin K
Fri Mar 02, 2018 1:32 pm
Forum: General Car/Truck Racer Topics
Topic: First pinewood derby experience!! And now a few questions...
Replies: 25
Views: 1688

Re: First pinewood derby experience!! And now a few questions...

Since you're running bent rear axles, there's a lot of speed to be either lost or gained depending on how well you've eliminated any potential toe-in or toe-out in the rear. Have you done any testing for that? I didn't read much on how to check toe in or out, so that is something I would really lik...
by Vitamin K
Fri Mar 02, 2018 11:59 am
Forum: General Car/Truck Racer Topics
Topic: First pinewood derby experience!! And now a few questions...
Replies: 25
Views: 1688

Re: First pinewood derby experience!! And now a few questions...

Sounds like you've done your due diligence with prep on the cars.

Since you're running bent rear axles, there's a lot of speed to be either lost or gained depending on how well you've eliminated any potential toe-in or toe-out in the rear. Have you done any testing for that?