Hovercraft B/C

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timothyre
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Re: Hovercraft B/C

Post by timothyre »

Just a very quick question that one of my students asked me. The rules for hovercraft state that "Commercial batters, including rechargeable, not exceeding 9.0 V as labeled, may be used to energize the motors on the vehicle." My student asked me if that was limited to 9.0 V batter PER motor, or 9.0 V to power both motors. I am pretty confident that it is 9.0 V TOTAL for the vehicle, but told him I would check to be 100% certain.

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Re: Hovercraft B/C

Post by LittyWap »

timothyre wrote:Just a very quick question that one of my students asked me. The rules for hovercraft state that "Commercial batters, including rechargeable, not exceeding 9.0 V as labeled, may be used to energize the motors on the vehicle." My student asked me if that was limited to 9.0 V batter PER motor, or 9.0 V to power both motors. I am pretty confident that it is 9.0 V TOTAL for the vehicle, but told him I would check to be 100% certain.

Thanks

The limitation is 9V per motor. At competitions last year, proctors made sure to check if batteries were run in series. It doesn't matter how many batteries per motor, the electromotive potential across the circuit has to be less or equal to 9.0V. There's no limit on amperage.
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Re: Hovercraft B/C

Post by geniusjohn5 »

For the written exam, do sig figs and uncertainties matter?
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Re: Hovercraft B/C

Post by Birdmusic »

geniusjohn5 wrote:For the written exam, do sig figs and uncertainties matter?
I believe the SOInc guidelines say that sig figs only matter for Division C, however, I guess its up to the test writers.
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Re: Hovercraft B/C

Post by gcrewmc3 »

Hello fellow Olympians,
I was wondering if you can have two 8.4 volt batteries on the hovercraft to power the motors? I know the rules say you can’t have more than 9 volts in a battery.

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Re: Hovercraft B/C

Post by retired1 »

Can you stand that amount of weight?
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Re: Hovercraft B/C

Post by Birdmusic »

gcrewmc3 wrote:Hello fellow Olympians,
I was wondering if you can have two 8.4 volt batteries on the hovercraft to power the motors? I know the rules say you can’t have more than 9 volts in a battery.

Thanks!
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Re: Hovercraft B/C

Post by geniusjohn5 »

Just a quick clarification: Is the hovercraft this year(2017-2018) generally going to be a lot bigger than it was last year(2016-2017)?
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The physicist asks, "In the universe, does matter really matter?"
The chemist replies, "I shall find solutions to both questions."
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Re: Hovercraft B/C

Post by Adi1008 »

geniusjohn5 wrote:Just a quick clarification: Is the hovercraft this year(2017-2018) generally going to be a lot bigger than it was last year(2016-2017)?
The increased the maximum dimensions to 40x40cm so it's reasonable to expect bigger devices than last year
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Re: Hovercraft B/C

Post by geniusjohn5 »

This may sound like a really dumb question but I'm an extreme newbie to this event. Does the hovercraft float on the air-contained skirt or is there a little bit of plain open air beneath the skirt?
The biologist speculates, "What's the meaning of life?"
The physicist asks, "In the universe, does matter really matter?"
The chemist replies, "I shall find solutions to both questions."
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