Quote:
Originally Posted by Ether
I did a rough calculation to check this.
21.63 work done on load, joules
272 velocity of load at end of kick, inches/sec
If vamfun or MattH are reading this thread I welcome your criticism.
* http://forums.usfirst.org/showthread.php?t=14218
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I did a quick check against my excel dynamic piston model and I get
23 joules and 231 in/sec so you are in the ball park with me.
I have the valves and a piping modeled and some approx to the dead volumes of the pistons. If I add a piping factor of .5 *Cv these drop to
22 joules and 219 in/sec.
Hmmmm: I must fess up to the 20in/s that I reported in this post:
http://www.chiefdelphi.com/forums/sh...90&postcount=1
Piston hammering was my concern and I'm in the camp that requires hard stops to prevent it for safety concerns. Foot speeds of over 300 in/s are required for long kicks and teams with pistons stopping the foot (even with a 10 to 1 lever arm are still reaching over 30 in/s).
As for rationale: I think LaFleur was spot on here.
http://www.chiefdelphi.com/forums/sh...7&postcount=31