"f86sabre" (f86sabre)
01/11/2020 at 18:36 • Filed to: pinewood derby
8
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"f86sabre" (f86sabre)
01/11/2020 at 18:36 • Filed to: pinewood derby | 8
| 8 |
The daughter scout’s car came in second overall. A good run. Ended up .02 seconds behind the winning car. For the minimal amount of time we spent on it that’s pretty good.
ranwhenparked
> f86sabre
01/11/2020 at 19:03 |
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Not a bad showing at all, nearly a tie.
That was always the one Cub event I really didn’t mind losing a weekend for when I worked for them , the overnight ones sucked though.
pip bip - choose Corrour
> f86sabre
01/11/2020 at 23:27 |
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need to do some wind tunnel testing to grab first place
:D
JeepJeremy
> f86sabre
01/12/2020 at 00:01 |
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my daughter’s scout pack has their derby in about a month. Any tips? This is our first
Highlander-Datsuns are Forever
> f86sabre
01/12/2020 at 00:54 |
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These are all about friction, the speeds are not enough for aero to come into play.
just-a-scratch
> JeepJeremy
01/12/2020 at 02:37 |
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Weights should bring the car to the legal limit.
Mounting weights high and toward the rear helps keep cg high to allow just a bit more potential energy stored and turned into speed on track.
Only 3 wheels need to roll on the track. The 4th is best used to get it to follow the track.
If they allow powdered graphite on the axles, use it.
Make sure your axles are smooth. I found a bit of 00 steel wool takes out minor imperfections well.
I never tried skeletonized wheels, but I imagine they could help by decreasing rotational inertia. That would have a bit of risk on wheel strength though.
TheRealBicycleBuck
> JeepJeremy
01/12/2020 at 07:49 |
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If they allow wheel modifications, re-profile them a bit to minimize the amount of surface touching the track. Also, make sure they are aligned so the car rolls straight!
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f86sabre
> JeepJeremy
01/12/2020 at 08:51 |
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Most districts rules now mandate that all 4 wheels touch, so be careful there. Clean up the axles, hit them with graphite, make sure there is about 2 business cards gap between the inside flange of the wheel and the car body and don’t paint the car body where the inside flange of the wheel may rub. We lightly sand those and hit them with graphite as well. Get the weight as close to the max as possible.
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f86sabre
> JeepJeremy
01/12/2020 at 08:52 |
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Most districts rules now mandate that all 4 wheels touch, so be careful there. Clean up the axles, hit them with graphite, make sure there is about 2 business cards gap between the inside flange of the wheel and the car body and don’t paint the car body where the inside flange of the wheel may rub. We lightly sand those and hit them with graphite as well. Get the weight as close to the max as possible.