Search found 89 matches

by HandsFreeCookieDunk
March 1st, 2017, 6:39 pm
Forum: 2017 Question Marathons
Topic: Hovercraft B/C
Replies: 38
Views: 6543

Re: Hovercraft B/C

Do I show work?|From Bernoulli's principle, I get a velocity of 4.427 m/s. Let's say that's horizontal velocity, so initial vertical velocity is 0 m/s. So it'll take 1.01015 s to hit the ground. No horizontal velocity --> 4.6047 m. Uhhh, 1 sigfig? So ~5m. Yeah, sorry about the sigfigs, I was just t...
by HandsFreeCookieDunk
February 27th, 2017, 8:08 am
Forum: 2017 Question Marathons
Topic: Hovercraft B/C
Replies: 38
Views: 6543

Re: Hovercraft B/C

I guess I'll go to the physics side. A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the...
by HandsFreeCookieDunk
February 27th, 2017, 6:13 am
Forum: 2017 Question Marathons
Topic: Hovercraft B/C
Replies: 38
Views: 6543

Re: Hovercraft B/C

I guess I'll go to the physics side. A cylindrical water tank has a small hole in its side through which water is spurting. The hole is 5m above the ground and 1m below the surface of the water. For simplicity's sake, assume the water level in the tank is not dropping. How far horizontally does the ...
by HandsFreeCookieDunk
February 26th, 2017, 9:26 pm
Forum: 2017 Question Marathons
Topic: Hovercraft B/C
Replies: 38
Views: 6543

Re: Hovercraft B/C

sciduck wrote:What are the world's largest hovercrafts used for?
I believe that would be the Zubr class, which is used for military transport.
by HandsFreeCookieDunk
February 14th, 2017, 7:20 pm
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136747

Re: Hovercraft B/C

Where did you get that number from? Does it say that in the specs or did you calculate it from static pressure? If you're sure it's right, it might be because the fan is meant to run at a higher voltage than you're giving it. It could also be a problem with your skirt, but I doubt that's what's cau...
by HandsFreeCookieDunk
February 14th, 2017, 5:54 pm
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136747

Re: Hovercraft B/C

Hello guys, I need help as to how you can make your HoverCraft heavier. I got these 500g calibration weights, but the HC doesn't seem to lift it. By terms of pressure output on the bottom fan, it can apparently lift 2.2 Kg's, Please help. Where did you get that number from? Does it say that in the ...
by HandsFreeCookieDunk
February 14th, 2017, 9:53 am
Forum: Helicopters C
Topic: Helicopters C
Replies: 209
Views: 37788

Re: Helicopters C

I guess I'll bring this up since we're talking about the kits. Did anyone else experience crazy turnaround times for the FF kit? We ordered ours before the new year and it still hasn't arrived. I'm starting to panic because the competition is only a month away.
by HandsFreeCookieDunk
February 7th, 2017, 9:02 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136747

Re: Hovercraft B/C

In regards to "vehicles must have an electric switch to permit safe starting"... If you are using two motors can they each be turned on with a separate switch or do they have to be linked to a single switch to turn it on? Disclaimer: This is one man's opinion and is in no way an official rules clar...
by HandsFreeCookieDunk
January 27th, 2017, 3:47 am
Forum: 2017 Lab Events
Topic: Hydrogeology C
Replies: 22
Views: 5098

Re: Hydrogeology C

Does anyone know how you are intended to solve the "Determine the distance Y" in the gradient step of the challenge? I see a series of calculations involving a system of equations and the law of cosines that will lead to the answer, but that seems really complicated compared to the simple calculati...
by HandsFreeCookieDunk
January 26th, 2017, 10:56 am
Forum: 2017 Lab Events
Topic: Wind Power B/C
Replies: 338
Views: 42168

Re: Wind Power B/C

Would anyone say that making the blade assembly using paper is helpful? I want to try... Our blades last year were a built from a paper product and did very, very well at the National Tournament. Well this has me interested. You don't mean standard printer paper, right? I feel that would be far too...

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