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Unread 09-01-2014, 09:02
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Mike Schreiber Mike Schreiber is offline
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FRC #0067 (The HOT Team)
Team Role: Mentor
 
Join Date: Dec 2006
Rookie Year: 2006
Location: Milford, Michigan
Posts: 477
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Re: Ball Flight Model

I've attached a simple to use iterative model that can be edited including comments on how everything is calculated and a FBD. I'm confident the no drag calculation is right because it is simple kinematics, I could use a reality check on the drag included portion because it seemed a little drastic to me, but I checked all my calculations.

I assumed the drag coefficient to be constant, I calculate the Reynolds number but I could not find a look up table online for Re versus Cd of a sphere, if someone knows of one I can easily add it in to recalculate and interpolate to this table on each iteration (probably won't make a significant difference).

I did not include spin because I don't believe many teams will intentionally put spin on the ball (I could be wrong).

Hopefully this can be helpful to someone.
Attached Files
File Type: xlsx Ball Trajectory.xlsx (169.0 KB, 221 views)
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Mike Schreiber

Kettering University ('09-'13) University of Michigan ('14-'18?)
FLL ('01-'02), FRC Team 27 ('06-'09), Team 397 ('10), Team 3450/314 ('11), Team 67 ('14-'??)