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Old 07-18-2017, 05:53 PM   #41 (permalink)
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As a note, 200 cubic inch pounds of energy is the rule of thumb used by most people doign design work.

Automag - .55 cubic inch dump chamber @ ~400 psi. This does NOT mean 400 psi at the ball, but 400 psi in the dump chamber.

Ion/Vibe/eNMEy - ~ 1 cubic inch dump chamber @ ~200 psi.

I am sure that there are others, but those are the two I can remember off the top of my head.

If you wish to use Boyle's Law ( P1 * V1 = P2 * V2 ) and assume there are no losses and no extra volume in the valving mechanism, you can assume the velocity will be somewhere around 300 fps.

In your longer barrel calculations, you must also take into account the additional friction in the system. (Actually it is a constant friction, simply applied over time, as the pressure drops due to increased volume. At some point, the amount of pressure will no longer overcome the friction, and the ball will begin slowing down. You also need to take into account air friction.)

Ty
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Old 07-18-2017, 07:00 PM   #42 (permalink)
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Quote:
Originally Posted by tymcneer View Post
If you wish to use Boyle's Law ( P1 * V1 = P2 * V2 )
Ty
Hah, I didn't notice the states (or operators) were mixed up in LT's post. I'm just used to batting it around to find the missing part. It's good to get it straight.
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Old 07-18-2017, 10:00 PM   #43 (permalink)
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I hadn't either... I just restated the formula so it was in a programmers language.

Ty
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Brass Monkey Customs

Brass Freak, Freak XL compatible and Equation inserts in .670, .678, and .685 (As I no longer have access to the machine to make certain sizes, I will not be replacing any which go out of stock.)

Still selling brass tubing, with .678 barrel stock now available!

My feedback: MCB - eBay - AO

Follow Brass Monkey Customs on Instagram and Facebook (work in progress)
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