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Unread 13-01-2017, 10:49
JohnFogarty's Avatar
JohnFogarty JohnFogarty is offline
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FTC #11444 (Garnet Squadron) & FRC#1102 (M'Aiken Magic)
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How Spin Affects Fuel Trajectory

In designing a flywheel shooter with my students I've come across something I'm sure many of you have or will discover. Spin causes some pretty weird things to happen to the fuel as they are in flight to their destination.

What I'm looking to do is increase consistency in my shots and I've already got pretty tight control of the RPM of the flywheel.

This suggestion was mentioned by another mentor that works with my team and I wanted to pass it along for thought and clarification as I work today.

Apparently when you use a flywheel shooter with just a backplate as the arc/curve you lose some of the energy and get less consistent flight paths with the balls because some of the energy you are trying to impart on the ball as kinectic energy is lost as rotational energy....ie spin on the ball. So the idea is instead of having a curve of plastic you instead have a arc made up of a bunch of small wheels, rollers, something of that sort so that you balance out the rotational energy and the ball simply flys up with no backspin....which could be a good thing especially with the fuel balls. The only reference design where I noticed a team had thought of this and were succesfully able to counteract the spin from their flywheel was team 1717 in 2014.

https://www.chiefdelphi.com/media/im...fe76bdff_l.jpg

I'm not an ME so I hope I'm not explaining things too incorrectly, but I thought this was interesting.
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John Fogarty
2010 FTC World Championship Winner & 2013-2014 FRC Orlando Regional Winner
Mentor FRC Team 1102 M'Aiken Magic
"Head Bot Coach" FTC Team 11444 Garnet Squadron
Former Student & Mentor FLL 1102, FTC 1102 & FTC 3864, FRC 1772, FRC 5632, FRC 4901
2013 FTC World Championship Guest Speaker

Last edited by JohnFogarty : 13-01-2017 at 12:11.
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