Our 2012 Cars
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- Master Pine Head
- Posts: 183
- Joined: Wed Jun 13, 2012 12:10 am
- Location: Kirkland, Washington
Our 2012 Cars
This is the car my son, my father, and I built for his Tiger year. Turns out a car that we thought might be competitive was pretty good and won the pack. It's based on a design by David Meade.
This is the car I build for me and other son for the sibling race. It was rushed (the axel/wheel prep weren't very good) and has a design flaw that made it unstable at the district track. The rear spoiler is a 3 oz. weight. The theory was that the higher the weight the farther it had to fall coming down the hill (longer boost), which was true, but when it transitioned to the flat it wobbled a lot and lost speed going back and forth.
I would give my son's car about a 6 out 10 and the blue car about a 5 out of 10 for preparation.
Both were 3 wheelers but neither were set up as rail riders and there was no canting. Also no bore prep (other than graphite). We didn't shave wheels either.
I've bought the rest of the tools I need to do much better prep next year. My son and I didn't like loosing at districts (because of 1 bad run) and are determined to have a more consistent car next year.
A few more pictures of the two cars.
This is the car I build for me and other son for the sibling race. It was rushed (the axel/wheel prep weren't very good) and has a design flaw that made it unstable at the district track. The rear spoiler is a 3 oz. weight. The theory was that the higher the weight the farther it had to fall coming down the hill (longer boost), which was true, but when it transitioned to the flat it wobbled a lot and lost speed going back and forth.
I would give my son's car about a 6 out 10 and the blue car about a 5 out of 10 for preparation.
Both were 3 wheelers but neither were set up as rail riders and there was no canting. Also no bore prep (other than graphite). We didn't shave wheels either.
I've bought the rest of the tools I need to do much better prep next year. My son and I didn't like loosing at districts (because of 1 bad run) and are determined to have a more consistent car next year.
A few more pictures of the two cars.
- whodathunkit
- Pine Head Legend
- Posts: 2477
- Joined: Sat Apr 25, 2009 5:56 pm
- Location: Forgan, OK
Re: Our 2012 Cars
GO GO GO!
But what ever you do.. Watch out for differnt starting pen hights with that blue car.
Good thing for a little duck tape.
But what ever you do.. Watch out for differnt starting pen hights with that blue car.
Good thing for a little duck tape.
What type of automobile can be spelled the same forwards & backwards?
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- Master Pine Head
- Posts: 183
- Joined: Wed Jun 13, 2012 12:10 am
- Location: Kirkland, Washington
Re: Our 2012 Cars
Yep. We race on a wooden track with a manual start at the pack, but at districts they use a pretty nice aluminium track. I sent a few emails to organizers asking about pin heights before I built this car. Didn't want to risk it on the black car (my son's car), but on the sibbling/parent car... I figured we'd try it out.
The blue car is fast of the start due to weight and quick start, but transitions horribly.
The blue car is fast of the start due to weight and quick start, but transitions horribly.
Re: Our 2012 Cars
I think it has been determined "Cheater Bars" are no advantage and may well be a disadvantage. Weight high "on the car" is the reverse of what you stated. The car starts on a hill. Experts put the weight as low in the car as possible which will put the weight as high up the circular arc as you can possibly get it. If you are going for all out speed, "Think thin to win". I think Sporty might have said that. If he didn't say it his cars surely show it. I hope this helps. Good Luck.
Re: Our 2012 Cars
Thanks for sharing the photos and experience
Noskills
Noskills
"Nunchuk skills... bowhunting skills... pinewood derby skills... Girls only want boyfriends who have great skills!"
Napoleon Dynamite
Napoleon Dynamite
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- Master Pine Head
- Posts: 190
- Joined: Wed Jan 25, 2012 7:20 pm
- Location: Monroeville, PA
Re: Our 2012 Cars
Nice car.
Basically, think along the lines of "a lower weight is lifted up higher" when on the starting grid compared to on the flat, and the raised weight is tilted down some at the starting grid. Picture a car with one weight above the car and another below the car. Now, rotate it midway between the two weights about 30 degrees to simulate being on the starting grid. You've just raised the lower weight and lowered the raised weight. When the car gets to the bottom, it has had to raise the higher weight but the lower weight gets lowered even more. The lower weight has more potential energy.
If wanting to make a car with a raised wing, I usually suggest using a craft stick (tongue depressor). They're common and inexpensive. I also suggest to the scout to make it level to minimize wind resistance, instead of angled.
The craft sticks are also good at extending the front of the car after chopping off the rear so the rear axles can be as far back as possible. If designed as a front wing, it looks cool.
Actually, the lower the weight the farther it falls. I created a page with that info in it and have it somewhere at home. I've never posted it online. Maybe after the holidays I'll get a chance to find it and get it posted.Topspin.D wrote:The theory was that the higher the weight the farther it had to fall coming down the hill (longer boost), which was true, ...
Basically, think along the lines of "a lower weight is lifted up higher" when on the starting grid compared to on the flat, and the raised weight is tilted down some at the starting grid. Picture a car with one weight above the car and another below the car. Now, rotate it midway between the two weights about 30 degrees to simulate being on the starting grid. You've just raised the lower weight and lowered the raised weight. When the car gets to the bottom, it has had to raise the higher weight but the lower weight gets lowered even more. The lower weight has more potential energy.
If wanting to make a car with a raised wing, I usually suggest using a craft stick (tongue depressor). They're common and inexpensive. I also suggest to the scout to make it level to minimize wind resistance, instead of angled.
The craft sticks are also good at extending the front of the car after chopping off the rear so the rear axles can be as far back as possible. If designed as a front wing, it looks cool.
Shawn
Re: Our 2012 Cars
Thanks for the stories and lessons learned.
Also on the elevated wing weight, it makes your car top heavy and therefore wobbly.
Good luck on the next batch!
Also on the elevated wing weight, it makes your car top heavy and therefore wobbly.
Good luck on the next batch!
My wife started a new support group... Widows of the Pinewood Derby.