MagLev Vehicle B/C

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Re: MagLev Vehicle B/C

Postby personasaurus rex » February 10th, 2011, 1:15 pm

do you know those cars' masses?
My guess would be 201g... there's no point in making them any heavier than necessary, right?
yeah, but it's hard to get them down to minimum mass without sacrificing a little speed...
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Re: MagLev Vehicle B/C

Postby Primate » February 11th, 2011, 5:41 pm

The top three run times were 2.07s, 2.25s and 2.37s at WLI regionals - the test was rather easy and didn't really affect the score. Basically, it was the fastest that won.
10th grade, no Physics yet - what should I study?

Propeller: got a good one by dissecting an old computer
Try learning some physics anyway; it was a huge component of our test. It's really not all that complicated; just learn the basic equations for relating magnetic fields to electricity. (Here's a great introduction, and SparkNotes to sum it up.)

Are you sure a computer fan is the best option? They're generally designed to circulate air, not for propulsion.
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Re: MagLev Vehicle B/C

Postby Flavorflav » February 13th, 2011, 7:15 pm

The top three run times were 2.07s, 2.25s and 2.37s at WLI regionals - the test was rather easy and didn't really affect the score. Basically, it was the fastest that won.
10th grade, no Physics yet - what should I study?

Propeller: got a good one by dissecting an old computer
Try learning some physics anyway; it was a huge component of our test. It's really not all that complicated; just learn the basic equations for relating magnetic fields to electricity. (Here's a great introduction, and SparkNotes to sum it up.)

Are you sure a computer fan is the best option? They're generally designed to circulate air, not for propulsion.
Newton's Third - move air out the back and the car will move forward. The real problem is that computer fans are designed to be quiet, which is likely to reduce their efficiency.

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Re: MagLev Vehicle B/C

Postby Primate » February 14th, 2011, 2:14 am

10th grade, no Physics yet - what should I study?

Propeller: got a good one by dissecting an old computer
Try learning some physics anyway; it was a huge component of our test. It's really not all that complicated; just learn the basic equations for relating magnetic fields to electricity. (Here's a great introduction, and SparkNotes to sum it up.)

Are you sure a computer fan is the best option? They're generally designed to circulate air, not for propulsion.
Newton's Third - move air out the back and the car will move forward. The real problem is that computer fans are designed to be quiet, which is likely to reduce their efficiency.
Well, sure, but the shape can drastically effect efficiency as well. You want to minimize drag while maximizing thrust, optimizing pitch, etc, etc.

Of course, prop design isn't consequential until you get down to the three-four second range. The difference between a 45 second run and a 5 second run is all balance.
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Re: MagLev Vehicle B/C

Postby Flavorflav » February 14th, 2011, 2:49 am

Well, sure, but the shape can drastically effect efficiency as well. You want to minimize drag while maximizing thrust, optimizing pitch, etc, etc.
Of course, but a shape that is good for moving air is good for moving air, is what I am saying. It shouldn't really matter whether the assembly is on a fixed platform or not. The big problems are that fans are missing some design considerations (like weight) and have others (like quietness) that are likely to make them suboptimal. I have seen at least one really good maglev with a ducted fan, though.

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Re: MagLev Vehicle B/C

Postby personasaurus rex » February 24th, 2011, 3:06 pm

So since a lot of competitions have passed, I was wondering if people had maglev times to share? What mass was the sled at your competition and what was your time?
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Re: MagLev Vehicle B/C

Postby bchero » February 25th, 2011, 5:43 pm

I was just assigned to this event and I have no idea about the actual construction of the car. I know most of the electricity and magnetism behind the event, but the construction is ticking me off. Anybody have any suggestions? Where should I start?

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Re: MagLev Vehicle B/C

Postby quizbowl » February 25th, 2011, 6:44 pm

Does anyone know what exactly would be on the test?
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Re: MagLev Vehicle B/C

Postby Primate » February 25th, 2011, 7:43 pm

Does anyone know what exactly would be on the test?
Anything remotely related to magnetism is fair game. History, important scientists (know these!), physics (magnetic fields, current through wires, etc), and just plain old common sense about how magnets behave. Know paramagnetism and dimagnetism too.

Sample question from our test--I'm not sure what the answer is:
You're given three rods. One is a permanent magnet, one is brass, and one is steel. How can you determine which is which, using only your hands and the three rods?
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Re: MagLev Vehicle B/C

Postby Flavorflav » February 28th, 2011, 3:00 am

I was just assigned to this event and I have no idea about the actual construction of the car. I know most of the electricity and magnetism behind the event, but the construction is ticking me off. Anybody have any suggestions? Where should I start?
1. Get some motors, propellers and a bunch of nine volt batteries. You are going to suck a lot of them dry doing time trials.
2. Build a very simple platform for them - I like aircraft plywood, myself.
3. Get some velcro strips to attach the magnets to the bottom. These are a lifesaver - a small adjustment of your magnets can produce a huge reduction in friction.

You are going to need to elevate the prop, unless you use a really small one (which I do not recommend).

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Re: MagLev Vehicle B/C

Postby Primate » February 28th, 2011, 1:21 pm

I was just assigned to this event and I have no idea about the actual construction of the car. I know most of the electricity and magnetism behind the event, but the construction is ticking me off. Anybody have any suggestions? Where should I start?
1. Get some motors, propellers and a bunch of nine volt batteries. You are going to suck a lot of them dry doing time trials.
2. Build a very simple platform for them - I like aircraft plywood, myself.
3. Get some velcro strips to attach the magnets to the bottom. These are a lifesaver - a small adjustment of your magnets can produce a huge reduction in friction.

You are going to need to elevate the prop, unless you use a really small one (which I do not recommend).
Also, once you elevate that prop, you need to make sure your balance is spot-on--the motor/prop will have a lot of torque on your vehicle. Any tipping causes a huge increase in friction.
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Re: MagLev Vehicle B/C

Postby seamonkey36 » March 1st, 2011, 1:49 pm

i would use plastic propellers. You should bring your own pencils, but the judge will usually have one just in case.
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Re: MagLev Vehicle B/C

Postby butter side up » March 3rd, 2011, 8:31 am

Does anyone know what exactly would be on the test?
ii. The following topics may be included: Basic information on physics of magnetism, common uses of magnets, medical uses of magnets, superconductors.
I hope that helps- it's what the rules say, even if it's not very specific. The only test I've taken so far was extremely random- our resources didn't help much (basically I printed everything NASA had to say on magnetism the night before the invite) so we just guessed on alot of it. The test was all multiple-choice though, and we got the highest score on that part. unfortunately, we got taken down two tiers and lost our first place because our battery was dieing and we had to remove weight and came in a few grams under.
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Re: MagLev Vehicle B/C

Postby sihT etupmoC » March 7th, 2011, 6:17 pm

Where is a good place to get the magnets? The sources the new york site lists have them listed for $20..
Is there any other type of magnet you could get from Wal Mart or other store? Or somewhere cheap online?
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Re: MagLev Vehicle B/C

Postby Flavorflav » March 8th, 2011, 6:54 am

That's not $20 per magnet, it is $20 for a package of 100. You are not going to do better on a per magnet basis unless you get the Kelvin pack of 250, but you can find smaller quantities. Just be sure to get rectangular magnets - the round ones don't work at all.


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