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Re: Wind Power B/C
Posted: October 6th, 2015, 1:40 pm
by Unome
RontgensWallaby wrote:A CD motor should be provided at the competition, right?
If so, I know that it would still be a good idea to have one for testing purposes.
If your first question is intended as a question, the rules seem to imply no (as usual, this website is not the place for official clarifications, submit a FAQ, etc.)
Also, welcome to Div C! (even though I've barely arrived at Div C myself)
Re: Wind Power B/C
Posted: October 6th, 2015, 4:09 pm
by samlan16
Unome wrote:RontgensWallaby wrote:A CD motor should be provided at the competition, right?
If so, I know that it would still be a good idea to have one for testing purposes.
If your first question is intended as a question, the rules seem to imply no (as usual, this website is not the place for official clarifications, submit a FAQ, etc.)
Also, welcome to Div C! (even though I've barely arrived at Div C myself)
Well, I'll say it. Welcome to Div C!
Re: Wind Power B/C
Posted: October 7th, 2015, 6:26 am
by SPP SciO
Unome wrote:RontgensWallaby wrote:A CD motor should be provided at the competition, right?
If so, I know that it would still be a good idea to have one for testing purposes.
If your first question is intended as a question, the rules seem to imply no (as usual, this website is not the place for official clarifications, submit a FAQ, etc.)
Rule 2.d.iii answers that one ... the whole testing set-up will be provided by the ES. But yeah, it's essential to have your own set-up, to practice!
Until we get a proper CD motor/attachment etc, we will use a small DC motor with a cork stuck upside-down on the shaft. Wedge the CD onto the cork, and, voila! It's a little tricky to get it to sit nice and perpendicular, but it's pretty quick.
Re: Wind Power B/C
Posted: October 7th, 2015, 7:38 pm
by CTMSRoadScholarKING
We are allowed to glue our blades to the Cd right?
Re: Wind Power B/C
Posted: October 8th, 2015, 4:15 am
by JonB
CTMSRoadScholarKING wrote:We are allowed to glue our blades to the Cd right?
Yes.
Re: Wind Power B/C
Posted: October 9th, 2015, 7:25 am
by brayden box
That's good.
Re: Wind Power B/C
Posted: October 11th, 2015, 3:51 pm
by knox_coach
Any suggestions on how to rig a device at home to test this event? New team and I want to make sure my students have a clear idea of what is being tested here. How do we measure the ohms at home?
Re: Wind Power B/C
Posted: October 11th, 2015, 4:47 pm
by samlan16
knox_coach wrote:Any suggestions on how to rig a device at home to test this event? New team and I want to make sure my students have a clear idea of what is being tested here. How do we measure the ohms at home?
It is based on the resistance of the circuit the blades are running. For example, if the total resistance of the wire, voltmeter, and resistor is 550 Ω, then every team's power will be calculated using that value. If a team generated 0.40 V, then its score would be 0.40^2/550 = 2.9 x 10^-4 W.
Re: Wind Power B/C
Posted: October 12th, 2015, 7:35 pm
by Daquan
I was wondering what we will be tested on like specifically. I don't currently have the the rules so I was just wondering.
Re: Wind Power B/C
Posted: October 13th, 2015, 5:48 am
by samlan16
Daquan wrote:I was wondering what we will be tested on like specifically. I don't currently have the the rules so I was just wondering.
We can't post the exact rules for copyright reasons, but the five subjects are rotor/ blade design, power generators, power storage, power transmission, and historical wind power designs. They are very specific and require a minimum of 25 questions per test, 5 per subject.
I would recommend reading plenty of scientific literature.