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What Hump?
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1,107 Posts
Discussion Starter · #1 ·
I was hooking up all of our pneumatic props tonight and I ran into an issue:

On one of my props, with a four-bar lifter mechanism, I'm using speed control mufflers, from Fright Props, on both exhaust ports.

On the B exhaust port, the one that exhausts the air on the prop's way back down...it will occasionally continue to leak air after the cylinder has fully retracted. If I loosen up the speed control muffler to let more air pass, it will stop.

I don't think it's a problem with the muffler, I think it might be that, with the airflow attenuated on that exhaust port, there's not enough airflow for the port to close completely. But I'm no expert, yet.

Has anyone experienced this?

How do I correct the issue?

I hope I've explained it clearly enough to understand.
 

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BAD INFLUENCE
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11,483 Posts
What is the pressure you are operating the cylinder ? It may be a little bit on the low side and not fully shifting the spool in the solenoid. Try increasing the air pressure a bit.
 
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