Wind Power B/C

[bonysteak]

Updated score sheet posted on soinc. Does anyone know what "Uncorrect Const. Violation" refer to? Which rule is this pertain to?

Isn't that like when you have a construction violation but either you don't want to or are unable to fix it? So I guess that'd be a bigger penalty than if you took it with you to impound and fixed a problem you had there, before the event happened and you needed to test it.

[chalker]

Updated score sheet posted on soinc. Does anyone know what "Uncorrect Const. Violation" refer to? Which rule is this pertain to?

Isn't that like when you have a construction violation but either you don't want to or are unable to fix it? So I guess that'd be a bigger penalty than if you took it with you to impound and fixed a problem you had there, before the event happened and you needed to test it.

It's rule 4.d.

[soyuppy]

Updated score sheet posted on soinc. Does anyone know what "Uncorrect Const. Violation" refer to? Which rule is this pertain to?

Isn't that like when you have a construction violation but either you don't want to or are unable to fix it? So I guess that'd be a bigger penalty than if you took it with you to impound and fixed a problem you had there, before the event happened and you needed to test it.

It's rule 4.d.

So if there is a construction violation, they don't fix it, then they get 0. Do we allow them to test/run if they don't correct?
And if they correct, then they get deduct 30%. i.e. both voltage reading is multiply by .7?
is this correct understanding?

[chalker]

Isn't that like when you have a construction violation but either you don't want to or are unable to fix it? So I guess that'd be a bigger penalty than if you took it with you to impound and fixed a problem you had there, before the event happened and you needed to test it.

It's rule 4.d.

So if there is a construction violation, they don't fix it, then they get 0. Do we allow them to test/run if they don't correct?
And if they correct, then they get deduct 30%. i.e. both voltage reading is multiply by .7?
is this correct understanding?

Yes. You can let them run, but they automatically get a 0 on that fan speed.

[soyuppy]

I know we don't use load resistance to do calculation anymore, but it would nice to have either the rubric score sheet or checklist capture the resistance. This give some perspective how the blade perform with respect to resistance.

[Ionizer]

I know we don't use load resistance to do calculation anymore

I don't think load resistance was necessary to do any calculations in the first place. Last year when the scoring was the ratio of your power to the best team's power, resistance canceled out from the ratio. (V1^2/R)/(V2^2/R) = (V1^2/V2^2).

[soyuppy]

I know we don't use load resistance to do calculation anymore

I don't think load resistance was necessary to do any calculations in the first place. Last year when the scoring was the ratio of your power to the best team's power, resistance canceled out from the ratio. (V1^2/R)/(V2^2/R) = (V1^2/V2^2).

Yes, if you only care how you stack up against other team. There's more value to knowing how your blade perform given the resistance load and the fan. A 500mV output is meaningful only if we know what the resistance in the circuit is, whether it's 5 Ohm or 10 Ohm, it makes all the difference in knowing it.

[chalker]

I know we don't use load resistance to do calculation anymore

I don't think load resistance was necessary to do any calculations in the first place. Last year when the scoring was the ratio of your power to the best team's power, resistance canceled out from the ratio. (V1^2/R)/(V2^2/R) = (V1^2/V2^2).

Yes, if you only care how you stack up against other team. There's more value to knowing how your blade perform given the resistance load and the fan. A 500mV output is meaningful only if we know what the resistance in the circuit is, whether it's 5 Ohm or 10 Ohm, it makes all the difference in knowing it.

It's not just the resistor that matters, but also the specs on the motor/generator. Regardless, we don't like adding extraneous things to the scoresheets /checklists as that increases the burden on the event supervisor and raises questions about what the purpose of including it is. This is particularly true if the item isn't used in an calculations, since people tend to look at these things closely and will think there is an error in the score sheet.

[jasony123123]

i noticed that nothing can be placed behind,so

1) no tape is allowed behind?
2) while the assembly is rotating it is not allowed to bend behind ?

[Ionizer]

Really? My team just attached our blades to the front of the CD, and I assumed that was what most other teams did too. Is this not the case, or are you referring to backward deflection now being illegal?

Yes really. There were 3 things we noticed: 1. teams would punch holes in the CD to thread string or something through to secure the blades, 2. teams would use tape and wrap the tape around the back edge of the CD, 3. the blades would be designed so that due to their pitch they naturally ended up behind the plane of the CD.

If you didn't do any of these, congrats as your blade meets the new specs.

Regarding backward deflection during operation, that's ok. The rule change refers to 'when initially mounted'.

chalker already answered this @jasony123123