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EcoDyne wrote:Quick question about the chart score: Do a chart and a graph containing the same data count as two separate charts/graphs out of the four chosen by the event supervisor?

According to the ES for the Solon Invitational 2018, Charts and Graphs must contain different data to be scored separately. For example, for one chart, you must change one variable (ex. mass) to see its effect on the dependent variables. For another chart, you must change a different variable spanning the range of the data (Ex. voltage) in order for it to be scored separately. Creating a chart and then a graph of the same data of the chart will not count as two separate charts/graphs.

Our team learned this the hard way when we found that out at the invite

IvanGe wrote:I just 3D print my entire body and then add the motors and stuff

Have you tried styrofoam or wood? like is there a significant advantage to 3D printing??

Wel you know the mass is perfectly distributed (or atleast as close as anyone is ever gonna get) , and it just looks really cool (or intimidating if you want to )

It also would speed up the reconstruction of hovers of the same model using the same file. With good initial designing, it saves a LOT of time when creating backups/ new prototypes.

shrewdPanther46 wrote:Wel you know the mass is perfectly distributed (or atleast as close as anyone is ever gonna get) , and it just looks really cool (or intimidating if you want to )

It also would speed up the reconstruction of hovers of the same model using the same file. With good initial designing, it saves a LOT of time when creating backups/ new prototypes.

LOL our current hover has like negative intimidation (yikes)! I’m not able to find a 3D printer w a large enough print area though :/ would printing the base in parts be too sketchy/unreliable?

shrewdPanther46 wrote:Wel you know the mass is perfectly distributed (or atleast as close as anyone is ever gonna get) , and it just looks really cool (or intimidating if you want to )

It also would speed up the reconstruction of hovers of the same model using the same file. With good initial designing, it saves a LOT of time when creating backups/ new prototypes.

The one thing to consider about reconstruction time is that printing (at least for us) takes quite a bit of time to do. We've found it easier just to fabricate our bases by hand, and even if we have to start from scratch it ends up being quicker than waiting for a large print job.

pancakecat wrote:LOL our current hover has like negative intimidation (yikes)! I’m not able to find a 3D printer w a large enough print area though :/ would printing the base in parts be too sketchy/unreliable?

I'd say that while printing the base as 1 piece may work better for some teams, printing the base in parts is probably not the way to go. You can probably find lighter materials for the main part of the base and print out some of the structures and attachments, which would again be more efficient than just 3D printing.

Does anyone have any thoughts about the following problem from an invitational last Saturday? Neither I nor my physics teacher had any idea:

22. The mass flow rate through a cylindrical pipe of cross sectional area A =0.500 m2 is 1500. kg/sec. What is the pressure drop over a distance of 10.0 m?

dmis wrote:Does anyone have any thoughts about the following problem from an invitational last Saturday? Neither I nor my physics teacher had any idea:

22. The mass flow rate through a cylindrical pipe of cross sectional area A =0.500 m2 is 1500. kg/sec. What is the pressure drop over a distance of 10.0 m?

I said 0 Kpa and it was marked incorrect lol

Ashernoel wrote:

dmis wrote:Does anyone have any thoughts about the following problem from an invitational last Saturday? Neither I nor my physics teacher had any idea:

22. The mass flow rate through a cylindrical pipe of cross sectional area A =0.500 m2 is 1500. kg/sec. What is the pressure drop over a distance of 10.0 m?

I said 0 Kpa and it was marked incorrect lol

I can tell you the correct answer from the key was 10.0 Pa. If you don't have any luck solving it, I can email the event supervisor and ask for a more detailed solution.

dmis wrote:Does anyone have any thoughts about the following problem from an invitational last Saturday? Neither I nor my physics teacher had any idea:

22. The mass flow rate through a cylindrical pipe of cross sectional area A =0.500 m2 is 1500. kg/sec. What is the pressure drop over a distance of 10.0 m?

It should be 0. It's basically a Bernoulli equation problem, with no change in area/velocity or height, so there should not be a change in pressure. I assume the question was incorrectly worded.

That was my thought also. The answer of 10Pa also does not seem to make sense if you assume the 10m distance was vertical.

If you are going to ask the ES, My physics teacher and I were also unsure about question 23:

Suppose two pipes are made out of an identical material and have the same
length and the same fluid flowing through them. If pipe A has a cross-sectional
diameter that is twice as great as pipe B, how does the flow rate in pipe A differ
from the flow rate in pipe B?

...Which seems to be missing information.