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By: professor1212
New: 16-01-2010 23:39
Updated: 16-01-2010 23:39
Views: 2844 times
A cleaner kicker prototype we rigged today. Has a few kinks, less power than the wood prototype. Maybe a heavier head at the bottom? Or perhaps scrapped? If anyone finds a superior way to apply this method please let us know.
Discussion
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17-01-2010 01:29
dlavery
Re: pic: Pneumatic Kicker Rev_1
Three suggestions:
1. Try a smaller diameter cylinder. The reduced cross-section means you need less air to actuate the cylinder. For a given charge of air, you will get a faster response (up to a limit, as the high pressure wave through the tubing approaches supersonic speeds). There will be a transition point where the diameter reduction will result in less power transferred to the ball during the impact, but I think you are nowhere near that point yet.
2. Try a lighter hammer. This may seem counter-intuitive, but it works. Talk with your physics teachers about this.
3. Pre-load the lever arm with surgical tubing to augment the striking force of the cylinder.
-dave
17-01-2010 02:29
professor1212
Re: pic: Pneumatic Kicker Rev_1
|
Originally Posted by dlavery
Three suggestions:
1. Try a smaller diameter cylinder. The reduced cross-section means you need less air to actuate the cylinder. For a given charge of air, you will get a faster response (up to a limit, as the high pressure wave through the tubing approaches supersonic speeds). There will be a transition point where the diameter reduction will result in less power transferred to the ball during the impact, but I think you are nowhere near that point yet. 2. Try a lighter hammer. This may seem counter-intuitive, but it works. Talk with your physics teachers about this. 3. Pre-load the lever arm with surgical tubing to augment the striking force of the cylinder. -dave |
As for your second suggestion regarding the weight of the hammer....I'm rather intrigued. We were under the impression the weight was applying a large portion of the force against the ball...
17-01-2010 02:31
professor1212
Re: pic: Pneumatic Kicker Rev_1
sidenote:
dave lavery!!!
You're quite literally AWESOME.
17-01-2010 04:30
squeaker114
Re: pic: Pneumatic Kicker Rev_1
this seems like something i tried but with a shoe. but mine failed.
17-01-2010 08:32
Neo1699
Re: pic: Pneumatic Kicker Rev_1
Did you assume that the smaller bore cylinder could not pull back the surgical tubing, or was it tested? Yesterday I found a list of bore sizes, PSI, and the force each one can exert. It can be found here:
http://www.usfirst.org/uploadedFiles...%20Rev%20-.pdf
on page 15.
17-01-2010 23:07
rangersteve
Re: pic: Pneumatic Kicker Rev_1
Your power loss on the metal versus wood may have to do with the placement of the cylinder. It appears that on the wood model the cylinder is positioned to pull the hammer back and get a swing on the ball. While in the metal version it appears to start in contact with the ball and just push it.
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