Wind Power B/C

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Wind Power B/C

Postby robotman » August 22nd, 2015, 2:44 pm


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Re: Wind Power B/C

Postby chalker » September 2nd, 2015, 4:47 pm

Since I posted something in Air Trajectory, might as well give a high level overview of changes for Wind Power compared to the rules from several years ago. As always, you need to read the actual rules though to understand all the details:

-Used language similar to the robot events regarding commercial kits / designs requiring functional modifications
-Reduced testing time to 3 minutes total per station
-Students indicate to supervisor when to start the voltage measurement period (with fan already on and blade spinning)
-Max voltage during testing period used for scoring
-Written test topics revised to 5 general areas
-Penalty for stopping turning is now only a 0.8 multiplication factor

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Re: Wind Power B/C

Postby joiemoie » September 4th, 2015, 3:56 pm

If this is using max voltage rather than max power, this will definitely be a big game changer. Once again, the focus will be on speed then.

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Re: Wind Power B/C

Postby retired1 » September 4th, 2015, 5:18 pm

Yes and no. it is (max voltage in the 30 seconds measured) squared and that value divided by the load which is to be between5 and 7.5 ohms. Which is in parallel. Seems to me that it should be series.
There is one run at low wind and one at high wind.
The sum of the high wind value plus the low wind value is divided by the highest overall value which means that it is less than 1.0 for everyone but the best score. This is multiplied by 50
Then there is 50 points from the test to be added. So, the best score will be a bit under 100 points. High score wins.
It is true, that the faster you can get it to rotate, thee higher the voltage will be

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Re: Wind Power B/C

Postby chalker » September 4th, 2015, 5:48 pm

joiemoie wrote:If this is using max voltage rather than max power, this will definitely be a big game changer. Once again, the focus will be on speed then.


Not really. There is still a resistor in the circuit, and keep in mind the P=V*V/R, thus max power should pretty much occur at the same relative level as max voltage.

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Re: Wind Power B/C

Postby JonB » September 9th, 2015, 3:03 pm

In the rules this year (3B) it states that teams cannot modify the CD. Last time this event ran teams could trim down the CD so just the center of the CD is left to attach to the motor and the blades. Does it have to be a FULL, unmodified CD this year? Seems strange to me.

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Re: Wind Power B/C

Postby retired1 » September 9th, 2015, 6:21 pm

Struck me as a bit unusual, but it does tend to make the teams a bit more even since the wind can not blow thru the CD. We cut it out last time also. Ours looked like an old fashioned windmill.
Oh well, another obstacle to overcome.

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Re: Wind Power B/C

Postby JonB » September 10th, 2015, 4:25 am

retired1 wrote:Struck me as a bit unusual, but it does tend to make the teams a bit more even since the wind can not blow thru the CD. We cut it out last time also. Ours looked like an old fashioned windmill.
Oh well, another obstacle to overcome.


A rather strange obstacle, in my opinion. I think most teams (well, basically all of them) cut down the CD last time. If I remember correctly, the rules last time specifically stated that it could be cut down, but I could be wrong. But hey, something new and different if we are reading the rules correctly.

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Re: Wind Power B/C

Postby chalker » September 11th, 2015, 6:18 am

Yes, that is a change from previous years. It's primarily a safety issue. We had reports / concerns about teams shattering cd's and the resulting shards of plastic causing cuts and such.

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Re: Wind Power B/C

Postby CTMSRoadScholarKING » September 14th, 2015, 3:33 pm

So, I was making the Wind Power tutorial thing on soinc.org under the Wind Power section by KidWind, and the PVC in the nacelle says it is supposed to be 3" long, but it won't make a solid piece like it says. So, would it be a typo so that it isn't a 3" piece or did I do something wrong? Thanks for your help and sorry for the long sentence.
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Re: Wind Power B/C

Postby retired1 » September 14th, 2015, 5:38 pm

It is a piece of pipe so that you can put your motor inside of it by wrapping the motor with tape as required for a snug fit.

Notice that none of this applies to the event as you will be using a stripped down CD player for the motor. The last time that I saw this, they clamped aa case to a ring stand from the chem lab.

Interesting article.

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Re: Wind Power B/C

Postby CTMSRoadScholarKING » September 15th, 2015, 5:32 am

retired1 wrote:It is a piece of pipe so that you can put your motor inside of it by wrapping the motor with tape as required for a snug fit.

Notice that none of this applies to the event as you will be using a stripped down CD player for the motor. The last time that I saw this, they clamped aa case to a ring stand from the chem lab.

Interesting article.

So just making sure because I don't know if I understood the rules right, we are not allowed to use a motor?
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Re: Wind Power B/C

Postby samlan16 » September 15th, 2015, 6:05 am

CTMSRoadScholarKING wrote:
retired1 wrote:It is a piece of pipe so that you can put your motor inside of it by wrapping the motor with tape as required for a snug fit.

Notice that none of this applies to the event as you will be using a stripped down CD player for the motor. The last time that I saw this, they clamped aa case to a ring stand from the chem lab.

Interesting article.

So just making sure because I don't know if I understood the rules right, we are not allowed to use a motor?

If I understand correctly, we cannot. We will attach our rotors to a CD drive provided.
Remember, we are proud of every team that participated and you are all winners.

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Re: Wind Power B/C

Postby JonB » September 15th, 2015, 8:13 am

samlan16 wrote:
CTMSRoadScholarKING wrote:
retired1 wrote:It is a piece of pipe so that you can put your motor inside of it by wrapping the motor with tape as required for a snug fit.

Notice that none of this applies to the event as you will be using a stripped down CD player for the motor. The last time that I saw this, they clamped aa case to a ring stand from the chem lab.

Interesting article.

So just making sure because I don't know if I understood the rules right, we are not allowed to use a motor?

If I understand correctly, we cannot. We will attach our rotors to a CD drive provided.


This is correct. They will provide the testing apparatus which includes the CD mount with the motor already connected to it. You just make it spin.

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Re: Wind Power B/C

Postby theoriginalweevil » September 18th, 2015, 2:04 pm

Hi everyone, the last time I checked the wiki, it mentioned (recommended) modifying the cd's size so that it has less drag. On the Wind Power page, "alteration of the CD is a good idea..." But the rules states "modification of the CD Is not allowed, except to affix the blades". This outdated?

Also, any recommended reading for this event?

Many thanks.
:D


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