MagLev Vehicle B/C

Locked
personasaurus rex
Member
Member
Posts: 358
Joined: July 7th, 2010, 9:39 pm
Division: C
State: NY
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

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

Primate wrote:
personasaurus rex wrote: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...
2012: Forensics, Dynamic Planet, Sounds of Music, Water Quality, Write It Do It

User avatar
Primate
Member
Member
Posts: 409
Joined: January 15th, 2009, 4:34 pm
Division: C
State: NY
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by Primate » February 11th, 2011, 5:41 pm

Tinkerer wrote:
quizbowl wrote: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.
events 2012 gravity vehicle, robot arm, thermodynamics, tps

Flavorflav
Member
Member
Posts: 1376
Joined: February 5th, 2006, 7:06 am
Division: Grad
State: NY
Has thanked: 0
Been thanked: 1 time

Re: MagLev Vehicle B/C

Post by Flavorflav » February 13th, 2011, 7:15 pm

Primate wrote:
Tinkerer wrote:
quizbowl wrote: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.

User avatar
Primate
Member
Member
Posts: 409
Joined: January 15th, 2009, 4:34 pm
Division: C
State: NY
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by Primate » February 14th, 2011, 2:14 am

Flavorflav wrote:
Primate wrote:
Tinkerer wrote: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.
events 2012 gravity vehicle, robot arm, thermodynamics, tps

Flavorflav
Member
Member
Posts: 1376
Joined: February 5th, 2006, 7:06 am
Division: Grad
State: NY
Has thanked: 0
Been thanked: 1 time

Re: MagLev Vehicle B/C

Post by Flavorflav » February 14th, 2011, 2:49 am

Primate wrote: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.

personasaurus rex
Member
Member
Posts: 358
Joined: July 7th, 2010, 9:39 pm
Division: C
State: NY
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by 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?
2012: Forensics, Dynamic Planet, Sounds of Music, Water Quality, Write It Do It

bchero
Member
Member
Posts: 22
Joined: January 25th, 2010, 12:49 pm
Division: C
State: NY
Location: Vestal
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by 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?

User avatar
quizbowl
Member
Member
Posts: 1044
Joined: April 10th, 2010, 3:48 pm
Division: Grad
State: NY
Location: Syosset High, WLI, NY --> UChicago '16
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by quizbowl » February 25th, 2011, 6:44 pm

Does anyone know what exactly would be on the test?
2010: 5th in NYS
2011: 4th in NYS
2012: 3rd in NYS
<quizbowl> ey kid ya want some shortbread
<EASTstroudsburg13> I don't know why, but I just can't bring myself to delete this post.

User avatar
Primate
Member
Member
Posts: 409
Joined: January 15th, 2009, 4:34 pm
Division: C
State: NY
Has thanked: 0
Been thanked: 0

Re: MagLev Vehicle B/C

Post by Primate » February 25th, 2011, 7:43 pm

quizbowl wrote: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?
events 2012 gravity vehicle, robot arm, thermodynamics, tps

Flavorflav
Member
Member
Posts: 1376
Joined: February 5th, 2006, 7:06 am
Division: Grad
State: NY
Has thanked: 0
Been thanked: 1 time

Re: MagLev Vehicle B/C

Post by Flavorflav » February 28th, 2011, 3:00 am

bchero wrote: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).

Locked

Return to “2011 Build Events”

Who is online

Users browsing this forum: No registered users and 1 guest