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Old 01-24-2012, 08:29 PM   #1
dorkpunch OP
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Kub Cars.

Or- Pinewood derby for all you yanks. Everyone looks at me funny when I say Kub Car race, so it must be a Canadian thing. Helping my son build his first car and thought I'd post some pics. He came up with the design all by himself, drew it on the block without any help, and was adamant that it was the way it was going to be. I wasn't real impressed with the shape at first, but I gotta admit, its growing on me. Like a dork (can you blame me?!) I didnt take any pics until we were about half finished and I realized there was an 8 yr old in front of me running a mill... So then I got the camera out.

I got it all set up for him and showed him what to do. Away he went!





Once we had the pocket cut out, we did a little creative arranging with our bar stock weight and he screwed it in.



This was also his first experience with spray paint... There was some "light" sanding involved. He did start to get the hang of it but I did put the final coat on it for him. He showed me where he wanted the racing stripe, I taped it off, and he pushed the button on the can while I moved it.



Looking pretty good in my opinion!



We already polished the wheels and axles, just need to put 'em on tomorrow. He wants to paint some windows on it as well, we'll see how much time we have tomorrow before the race!

More pics to follow. Any tips and tricks? Last Kub Car rally I went to was mine, like 20 years ago.
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Old 01-24-2012, 08:38 PM   #2
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Any tips and tricks? Last Kub Car rally I went to was mine, like 20 years ago.
Pics of the moms at the race.
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Old 01-25-2012, 07:53 AM   #3
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My sons car took second place 2 years ago in his pack.

Make it balance on 3 wheels.

Weight in the back and low.

Polish the shit out of the wheels and axles. Don't use the slots for the axles, drill new holes with your mill so they're exact and straight.

Run it in on a belt sander, to get everything worn in.

Get the weight as close to the max as possible.

If you want to get fancy make some skinny plastic washers where the wheels get up against the body.

If I remember anything else I'll post it.
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Old 01-25-2012, 04:21 PM   #4
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I read about the three wheels and the weight thing... AND the cut your own slots for the axles all a little too late.

There was a bit of a design flaw in that we cut the shapes out too close to the axle slots so some of the wood chipped out and the front wheels dont have much to rub against, so the whole wheel rubs on the side of the car. Oh well, live and learn. He loves it. We've gotten it to coast fairly straight and the wheels and axles have received some special attention, so I think he'll do okay. Got some finished pics I'll post up in a bit and I'll get some at the race later tonight.
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Old 01-25-2012, 05:05 PM   #5
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Painted some windows on...



Attached some wheels...



Glued 'em in...



And ready! Kinda.





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Old 01-25-2012, 06:23 PM   #6
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The low front tends to help, people who undercut the front tend to get some "hop" on the pin which can cause them to come down funny.

Does violate my rules on how the wheels should sit but you noticed that.

Wonder if Kub Cars has a different rule book?
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Old 01-25-2012, 07:58 PM   #7
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I know the blocks we used were different, they had a big notch cut out of the top for some reason. Don't remember anything particular about the rules though. Pics of the race are uploading now!
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Old 01-25-2012, 08:27 PM   #8
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I know y'all are just dying to see the race pics, so here they are...

all lined up and ready to go!



He won some ,



and he lost a few more.



And it wouldnt be racin without some rubbin!



He won second place for his division... Out of 3 boys.

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Old 01-26-2012, 05:43 AM   #9
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He won second place for his division... Out of 3 boys.


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Old 01-26-2012, 05:46 AM   #10
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awesome
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Old 01-26-2012, 06:07 AM   #11
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sweet!

I made one once a LONG time ago... it was the shape of a reverse airfoil... i was into R/C airplanes at the time and wanted to reduce drag.

I can't remember how well it did, but I had fun, and i think I still have the car some 16 years later.
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Old 01-26-2012, 05:31 PM   #12
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I grew up in OK and we had CO2 powered cars. You could pick balsa or bass wood. The wheels were in thekit. That was fun.
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Old 01-26-2012, 06:52 PM   #13
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I love pinewood Derby cars. I still have both of mine. The first one was slow. The second one was the fastest in my pack and 2nd fastest in the regional meet (40-60 kids). Back then we could do just about anything as long as we made it and didn't buy them. I had my wheels lathed. There used to be a book you could get on building fast cars. The previous winner also used similar stuff as my car. There's a lot of little things you an do to get them faster.

I've also got a Co2 racer. Mine had issues with snagging the line it rode on and wasn't that fast. We built these for a wood shop class in JrHS.

Looks like his car was faster going backwards.
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Old 01-26-2012, 07:37 PM   #14
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It WAS faster going backwards.

I've built a CO2 car too, in college, for credit. Some days, I love my job... My CO2 car was the fastest in my class but either I got lucky or some of the other guys over-engineered theres. Mine was pretty simple- I just went for the absolute smallest frontal surface area possible and made everything SMOOOOTHH, and used a couple of tricks on the wheels and axles- chuck 'em up in the drill press and file the wheels round and smooth, and then put the axles in the drill press and smooth them out with steel wool. Guess it worked.
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Old 01-27-2012, 09:37 AM   #15
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got a bunch from when i was a kid. these sit on the shelf over my desk. the black one was well with in the rules and rather slow, but i like how it looks. the gold car was a winner every time it went down the track. they are a bit dusty but they have to be maybe 20 years old at this point.

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