Hovercraft B/C

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Hovercraft B/C

Postby bernard » Fri Jun 17, 2016 5:00 am


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Re: Hovercraft B/C

Postby rvonhof » Mon Sep 12, 2016 6:20 pm

Does anyone know of a good place to buy relatively cheap motors for an event like this, hopefully a place more concrete than ebay auctions?

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Re: Hovercraft B/C

Postby chalker » Tue Sep 13, 2016 1:45 am

rvonhof wrote:Does anyone know of a good place to buy relatively cheap motors for an event like this, hopefully a place more concrete than ebay auctions?

FYI, there is a different Hovercraft thread where we discussed this already. Here's my post, which should help:
http://scioly.org/phpBB3/viewtopic.php? ... &start=75#

Note: The linked thread discusses details from proposed rules. Always consult final rules when preparing for competitions.
Last edited by bernard on Tue Sep 13, 2016 4:32 am, edited 1 time in total.
Reason: See note.

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Re: Hovercraft B/C

Postby chalker » Tue Sep 13, 2016 12:12 pm

FYI, we just posted the Hovercraft clarification about brushless motors:

https://www.soinc.org/official_rules_clarif

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Re: Hovercraft B/C

Postby windu34 » Wed Sep 14, 2016 12:10 am

So I have managed to levitate a craft of the max weight with pretty low friction with the ground, but I cant seem to figure out the propulsion aspect. Of course propelling a craft with relatively low mass (and thus inertia) isn't all that complicated, can someone work out the CFM requirements and/or explain how to calculate the propulsion fan requirements for a 2kg mass?
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Re: Hovercraft B/C

Postby chalker » Wed Sep 14, 2016 3:26 am

windu34 wrote:So I have managed to levitate a craft of the max weight with pretty low friction with the ground, but I cant seem to figure out the propulsion aspect. Of course propelling a craft with relatively low mass (and thus inertia) isn't all that complicated, can someone work out the CFM requirements and/or explain how to calculate the propulsion fan requirements for a 2kg mass?


If you have very low friction, then the most fundamental of Physics equations applies: F=ma. Figure out the acceleration you want based upon the track length and target time, plug in 2kg for mass, and that tells you the force the fan needs to exert. To find out the thrust of a fan, you need to know the mass flow rate (CFM) through it and the velocity. Nasa has a good page explaining that here: http://wright.nasa.gov/airplane/propth.html

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Re: Hovercraft B/C

Postby PHXcoach » Fri Sep 16, 2016 9:00 pm

I am not sure that I follow rule 6.e. where a penalty is applied to the timing score of any run that has a competition violation. All the competition violations that I see result in a failed run (i.e. TS = 0) so what are the competition violations that don't cause a failed run and would trigger this rule ?

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Re: Hovercraft B/C

Postby chalker » Fri Sep 16, 2016 11:50 pm

PHXcoach wrote:I am not sure that I follow rule 6.e. where a penalty is applied to the timing score of any run that has a competition violation. All the competition violations that I see result in a failed run (i.e. TS = 0) so what are the competition violations that don't cause a failed run and would trigger this rule ?


That's kinda our catch all way of ensuring we didn't miss anything. One example might include touching the vehicle during a succesfull run (5.m.)

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Re: Hovercraft B/C

Postby PHXcoach » Sat Sep 17, 2016 8:09 am

chalker wrote:
PHXcoach wrote:I am not sure that I follow rule 6.e. where a penalty is applied to the timing score of any run that has a competition violation. All the competition violations that I see result in a failed run (i.e. TS = 0) so what are the competition violations that don't cause a failed run and would trigger this rule ?


That's kinda our catch all way of ensuring we didn't miss anything. One example might include touching the vehicle during a succesfull run (5.m.)


Ok - catch all makes sense.

BTW I thought that touching the vehicle is an unsuccessful run according to 5.m. so does not hit this catch all.

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Re: Hovercraft B/C

Postby chalker » Sat Sep 17, 2016 1:22 pm

PHXcoach wrote:BTW I thought that touching the vehicle is an unsuccessful run according to 5.m. so does not hit this catch all.


No. You have to parse that sentence carefully. It's saying yo can't touch it until it passes the finish line or is declared a failed run. It's NOT saying that if you touch it the supervisor declares it a failed run.

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Re: Hovercraft B/C

Postby PandaDevs » Sat Sep 17, 2016 3:05 pm

Is this event considered a trial event, and is subject to change at any time?
Simply said, this event can be removed and previous work done will constitute as useless.

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Re: Hovercraft B/C

Postby HandsFreeCookieDunk » Sat Sep 17, 2016 6:00 pm

PandaDevs wrote:Is this event considered a trial event, and is subject to change at any time?
Simply said, this event can be removed and previous work done will constitute as useless.


No, this is not a trial event. That being said, I believe every competition site has the right to remove any event.

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Re: Hovercraft B/C

Postby retired1 » Sat Sep 17, 2016 10:12 pm

While not common at the state level, they may drop an event and substitute another. For some poorly explained reason, Florida is doing it this year.
I do not like it as it puts FL teams behind other states in experience for this event at Nationals.
It is somewhat common for regionals to substitute as they may not be able to support a given event.

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Re: Hovercraft B/C

Postby windu34 » Sat Sep 17, 2016 11:23 pm

So as far as the definition of levitation goes, I feel I may be given a construction violation for what I have. I'm levitating barely .5mm off the ground, but as far as performance goes, its pretty good and very frictionless. Do I need to build a skirt system so that I levitate higher or do you think ES will be okay with it? (I know all competitions are different, etc)
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Re: Hovercraft B/C

Postby chalker » Sat Sep 17, 2016 11:55 pm

windu34 wrote:So as far as the definition of levitation goes, I feel I may be given a construction violation for what I have. I'm levitating barely .5mm off the ground, but as far as performance goes, its pretty good and very frictionless. Do I need to build a skirt system so that I levitate higher or do you think ES will be okay with it? (I know all competitions are different, etc)


The rules clearly define how to demonstrate levitation. Does your device rise when pushed down? Is the rise readily apparent to an objective observer? If so, it meets the criteria.

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