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Discussion in 'The Lounge' started by cbbr, Apr 10, 2007.
Legal of course. Anyone got any good tips?
I remember that thread from a while back.....good info there.
do you have to use the nail in axles or can you use the kits with the dowels center drilled fro screw in axles?
I can't find a copy of the local rules. My oldest is a Tiger Scout and they just told us to start planning our cars because they were going to announce the race soon. Of course I heard "planning" and my brain immediately translated it into "accumulating parts".
In the derbies I've been involved in, the troop or pack hands out the kits that are to be used. We were not allowed to deviate from the kit that was supplied......which helps keep a more level playing field.
I hate the nail axles deals. the screw into dowel ones you can tighten the wheel precisely to have just the right preload. Then use graphite on the wheel.
Go buy a giant tub of graphite from your local hardware store or home center. Get a heavy ziploc type freezer bag. Put graphite in, put car in, shake it. This will instill the graphite in every nook and cranny on the car. Makes the axles spin better, air flows better over the car. Works very very well, we've got the trophys to prove it.
Only let three of the four wheels touch the track. It is legal and it helps reduce friction. If I think of more Ill post back up.
The heavier the better. Also use lots of powdered graphite, as already stated.
be sure to weigh the car,make it heavy as possible within the rules.I used to drill a hole in the center and fill with lead weight until I had the max. legal weight.As stated above use graphite and smoth out the wheels that come in the kit.Alot of times they are rough cut.I take em and spin them in a drill while holding em up to a piece of sandpaper.
My son and I are working on his right now.
The morrow is weigh-day so we're rushing to get it done.
And yes, this is our first one too.
Good luck .
I'm only going to focus on a longer wheelbase and shape of the car this year.
I'd give you some tips but none of my cars ever made it past the first heat!
Heres a discussion by some smart folks aboot pinewood derby, from the Home Shop Machinist website:
I love the way you guys all say "I" did this, "I" did that, it's supposed to be the kids doing it! I, however, am also guilty of doing most of the building.
Here's pics of my son's winning car--left two things undone--all four wheels touch the track, and should have machined the wheels down to skinnies.
Doesn't the bottom of that catch a lot of drag? (Thinking of a tailgate on a pickup.)
Wow. Pinewood derby. Boy that brings back memories. Nothing clear enough to remember any tips. It was 1986 and I was 9. I didn't win anyway
this is the style I am talking about with rounded solid wheels and axles
http://www.pinewoodderbycars.com/ or do a search for royal ranger pinewood derby, thats who I was part of.
i had really good luck making the car a teardrop shape, making it weigh as much as the rules allow and dab some grease on the wheels
Mine looks like a rock compared to yours !!!
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