MagLev C

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MagLev C

Postby Jim_R » July 31st, 2013, 8:32 am

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Re: MagLev C

Postby GeoChamp96 » September 9th, 2013, 7:46 am

So, it says in the rules that the vehicle must hit a target time between 5 and 15 seconds for 95cm. This may just be me being relatively inexperienced, but how are you supposed to slow down the run time without changing the mass of the vehicle? That seems kind of impossible...

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Re: MagLev C

Postby chalker » September 9th, 2013, 9:13 am

So, it says in the rules that the vehicle must hit a target time between 5 and 15 seconds for 95cm. This may just be me being relatively inexperienced, but how are you supposed to slow down the run time without changing the mass of the vehicle? That seems kind of impossible...
I don't see anything in the rules prohibiting you from changing the mass of the vehicle....

And there are lots of other ways to approach this problem. A couple ideas off the top of my head (and by no means exhaustive): adjust the speed of the propeller, adjust the pitch of the propeller, change the direction of thrust relative to motion, partially block the intake to the propeller, induce some friction with the siderails.

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Re: MagLev C

Postby twototwenty » September 10th, 2013, 5:40 am

A very easy way to do this: potentiometer. Done and done.

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Re: MagLev C

Postby JTMess » September 10th, 2013, 8:36 am

So, it says in the rules that the vehicle must hit a target time between 5 and 15 seconds for 95cm. This may just be me being relatively inexperienced, but how are you supposed to slow down the run time without changing the mass of the vehicle? That seems kind of impossible...
I must say that I'm very disappointed with this change in the rules. I think going for a target time really takes the "racing" spirit out of the event.
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Re: MagLev C

Postby iwonder » September 10th, 2013, 8:38 am

I think that was the idea :P

Admittedly, it's not as exciting now, but still interesting.
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Re: MagLev C

Postby FawnOnyx » September 10th, 2013, 8:49 am

I in general like the changes they made, such as guards for propellers, and no need to go for the most power or mass. I do think that 5 to 15 seconds is a really slow target time range to move a max 2kg maglev just a meter though.
A very easy way to do this: potentiometer. Done and done.
I'm not sure, but wouldn't this cause heat dissipation problems when you resistively current limit the motor? I think most pots are rated for 1/4-1/2 watts, so even for 15 seconds wouldn't it overheat and blow?
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Re: MagLev C

Postby iwonder » September 10th, 2013, 8:54 am

Most pots don't have the power rating for this event, but some are rated for much high power. Just remember, it's not the power from the motor, it's the power that's lost in the resistor, they're typically a large difference.
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Re: MagLev C

Postby Schrodingerscat » September 10th, 2013, 8:58 am

It seems to me that while precisely meeting the time will be challenging without the danger, the magnetic levitation is now just a formality instead of an advantage when working properly, as I am pretty sure from experience last year that one could make 5 seconds sitting on the floor with a decent motor and prop combo.

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Re: MagLev C

Postby GeoChamp96 » September 10th, 2013, 9:33 am

So, it says in the rules that the vehicle must hit a target time between 5 and 15 seconds for 95cm. This may just be me being relatively inexperienced, but how are you supposed to slow down the run time without changing the mass of the vehicle? That seems kind of impossible...
I must say that I'm very disappointed with this change in the rules. I think going for a target time really takes the "racing" spirit out of the event.
I agree that the event isn't quite as exciting as it was last year, but it was kind of necessary. The rich teams had a huge advantage and the teams with smaller budgets were kind of stuck.

This way, you don't just go and buy the biggest 9V motor you can find and run it with 3000mAh LiPo


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