Hovercraft B/C

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Re: Hovercraft B/C

Post by Adi1008 » April 29th, 2018, 7:34 am

randomperson123 wrote:Is the hovercraft written test self-scheduled at nationals?
Based on the tentative schedule in the rulebook, hovercraft is completely self schedule.
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Re: Hovercraft B/C

Post by Birdmusic » May 1st, 2018, 8:06 pm

BasuSiddha23 wrote:How many rolls of pennies can your hovercrafts hold?

I just want to see our performance compared to other teams.
4 at most with full batteries. (yeah i can't build)
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Re: Hovercraft B/C

Post by jgrischow1 » May 2nd, 2018, 4:43 am

Sorry if something like this has already been posted, but we found a really good way to increase the number of pennies we could hold. When my kids were just randomly poking holes in the bottom of their skirt, they could only get 3-4 pennies on. We created a simple device in which graph paper was taped on to a piece of cardboard. We then poked thumbtacks through the intersections of the graph paper. We must have had hundreds of tacks on it. The kids pierced their skirts with the device, and the even holes really helped, enabling them to get 12-13 penny roles and a 15 second time.

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Re: Hovercraft B/C

Post by LittyWap » May 2nd, 2018, 8:54 pm

jgrischow1 wrote:Sorry if something like this has already been posted, but we found a really good way to increase the number of pennies we could hold. When my kids were just randomly poking holes in the bottom of their skirt, they could only get 3-4 pennies on. We created a simple device in which graph paper was taped on to a piece of cardboard. We then poked thumbtacks through the intersections of the graph paper. We must have had hundreds of tacks on it. The kids pierced their skirts with the device, and the even holes really helped, enabling them to get 12-13 penny roles and a 15 second time.


Seeing as how im not making it to Nats this year and this event is leaving in 2019, I should tell you that this was major to the success of my craft. It's like an air hockey table, where the holes restrict the volumetric flow and increase the static pressure.
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Re: Hovercraft B/C

Post by IvanGe » May 5th, 2018, 1:09 pm

Does anyone know if they will give you credit for an answer being 51.50N when the answer key says 51.52N? Does that small difference affect if you get credit or not?
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Re: Hovercraft B/C

Post by MIScioly1 » May 5th, 2018, 1:32 pm

IvanGe wrote:Does anyone know if they will give you credit for an answer being 51.50N when the answer key says 51.52N? Does that small difference affect if you get credit or not?
100% dependent on the supervisor. If the supervisor is requesting the calculation to be done in a certain way using sig figs, then I suppose that difference could affect credit. That being said, I would give it full credit if I were the supervisor.
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Re: Hovercraft B/C

Post by MIScioly1 » May 5th, 2018, 1:33 pm

MIScioly1 wrote:
IvanGe wrote:Does anyone know if they will give you credit for an answer being 51.50N when the answer key says 51.52N? Does that small difference affect if you get credit or not?
100% dependent on the supervisor. If the supervisor is requesting the calculation to be done in a certain way using sig figs, then I suppose that difference could affect credit. That being said, I would give it full credit if I were the supervisor.
I assume most would have no problem with it, though. (sorry for double post)
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Re: Hovercraft B/C

Post by CMS AC » May 5th, 2018, 2:38 pm

How significant is sig figs though? Like how many points would they take off?(No pun intended)

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Re: Hovercraft B/C

Post by antoine_ego » May 5th, 2018, 2:58 pm

CMS AC wrote:How significant is sig figs though? Like how many points would they take off?(No pun intended)
Depends on the test and test writer. For example, on Optics MIT, you lost half credit if your sig figs were off. I'd read the directions carefully; sometimes they ask for a fixed number (i.e. Astronomy MIT).
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Re: Hovercraft B/C

Post by UTF-8 U+6211 U+662F » May 5th, 2018, 6:40 pm

MIScioly1 wrote:
IvanGe wrote:Does anyone know if they will give you credit for an answer being 51.50N when the answer key says 51.52N? Does that small difference affect if you get credit or not?
100% dependent on the supervisor. If the supervisor is requesting the calculation to be done in a certain way using sig figs, then I suppose that difference could affect credit. That being said, I would give it full credit if I were the supervisor.
Also dependent on the question. If it's a straightforward one-step or two-step calculation, it's harder to deem it creditworthy than, say, if it was five or six calculations.

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