View Single Post
  #21   Spotlight this post!  
Unread 11-01-2012, 22:19
EricLeifermann's Avatar
EricLeifermann EricLeifermann is offline
That was a short break
FRC #2826 (Wave Robotics)
Team Role: Engineer
 
Join Date: Jan 2007
Rookie Year: 2001
Location: Wisconsin
Posts: 1,063
EricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond reputeEricLeifermann has a reputation beyond repute
Re: "Pitching Machine" motors

Quote:
Originally Posted by Ninja_Bait View Post
It's time for a free-body diagram explanation.

Bottom roller + hood:
Two forces: the force from the wheel and the force of friction from the hood. both work together to create backspin; friction works against the wheel to create forward acceleration.

Top and Bottom roller:
Two forces: The wheels work against each other, with the bottom wheel applying more torque to create backspin; the wheels work together to create forward acceleration.

So yes, there is a backspin consideration involved here - more backspin would be easier to get out of a hooded shooter. However, the wheel is forced to do more work, so you lose more momentum between shots, and can't shoot as far.
Have you seen some of the shooters from 2006 with only 1 wheel? They could shoot pretty far, the only thing keeping them from shooting as far as they could was the speed limit the had that year...
__________________
2002-2005 Appleton East High School: Team 93
2005-2011 Michigan Technological University: Team 857
2012-2016 Wave Robotics Team 2826