Wind Power B/C

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Re: Wind Power B/C

Post by wzhang5460 » May 13th, 2017, 6:49 pm

wzhang5460 wrote:
daydreamer0023 wrote:
wzhang5460 wrote:
Do you happen to know what the resistance was?
It's changed since last year (since now the resistance can be much more), but I suppose it was at 7.5ish ohms because our blade performed better at Nats than at my home setup.
Oh I see. Our turbine got about 300 mV at States but i don't know what the resistance was.
I'm guessing 10 ohms?
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Re: Wind Power B/C

Post by Alex-RCHS » May 13th, 2017, 9:02 pm

Knowing the resistance is nice but there are other factors at play as well. The motor itself has an internal resistance, and not every fan is the same.
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Re: Wind Power B/C

Post by daydreamer0023 » May 14th, 2017, 8:08 am

Alex-RCHS wrote:Knowing the resistance is nice but there are other factors at play as well. The motor itself has an internal resistance, and not every fan is the same.
Based off of that, if you want a slightly more accurate comparison, you might want to grab a tachometer and try finding the rpm of your blade - that could give you a sort of guesstimate of performance.
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Re: Wind Power B/C

Post by Ionizer » May 14th, 2017, 9:40 am

daydreamer0023 wrote:
Alex-RCHS wrote:Knowing the resistance is nice but there are other factors at play as well. The motor itself has an internal resistance, and not every fan is the same.
Based off of that, if you want a slightly more accurate comparison, you might want to grab a tachometer and try finding the rpm of your blade - that could give you a sort of guesstimate of performance.
I don't think this will help either. Different fans will still have different strengths. Different motors will have different frictions. Also rpm should depend on resistance as well. Electrical resistance adds a physical component that makes the motor harder to turn.
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Re: Wind Power B/C

Post by chozillla » May 15th, 2017, 8:51 pm

This is a question from an invitational and I still do not understand all parts of question 1. Can someone explain the answers for me? In return I will send you the full invitational test :)
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Re: Wind Power B/C

Post by BigBrown » May 20th, 2017, 11:29 pm

Hey anyone know wind power scores for the top at nats?

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Re: Wind Power B/C

Post by vjindal » May 21st, 2017, 7:25 am

Does anyone know what the best blades at nats looked like?
Were they lift-based?
Were they 3d printed?
What material were they made of?
Did they extend to the center of the CD or only near the outside?
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Re: Wind Power B/C

Post by Alex-RCHS » May 21st, 2017, 12:34 pm

vjindal wrote:Does anyone know what the best blades at nats looked like?
Were they lift-based?
Were they 3d printed?
What material were they made of?
Did they extend to the center of the CD or only near the outside?
I'm also curious to know this. Also, anyone know the top voltage scores?
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Re: Wind Power B/C

Post by RestingDoll » May 23rd, 2017, 8:44 am

Alex-RCHS wrote:
vjindal wrote:Does anyone know what the best blades at nats looked like?
Were they lift-based?
Were they 3d printed?
What material were they made of?
Did they extend to the center of the CD or only near the outside?
I'm also curious to know this. Also, anyone know the top voltage scores?
We came in 8th with 335 on low and 593 on high. Test was also ok (@ shadow flicker lol).

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Re: Wind Power B/C

Post by soyuppy » May 23rd, 2017, 5:09 pm

RestingDoll wrote:
Alex-RCHS wrote:
vjindal wrote:Does anyone know what the best blades at nats looked like?
Were they lift-based?
Were they 3d printed?
What material were they made of?
Did they extend to the center of the CD or only near the outside?
I'm also curious to know this. Also, anyone know the top voltage scores?
We came in 8th with 335 on low and 593 on high. Test was also ok (@ shadow flicker lol).
Can't assume that the blade performance alone earn 8th place. There's also the testing part. The combine blade+test exam score = 8th place. No way to know how blade score stack up without seeing raw score...which is somewhat protected from public info.

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