Again, sorry for context issue. What I meant was: "I've personally never found it easier to write a program for ONE INSTANCE than crunch the numbers for that specific scenario." I do know that creating a program to solve a problem like that multiple times is much worth it.

The schrader valve will not open at all if the pump is not connected, the pin must be pushed down- at least I know this happens up to about 120 psi- and a great way to extend the pin if that's what needs to be done- put a drop of solder on the top of the pin... I've never tried it, but it should wor...

If you're going to do a spray 'n' pray, I'd suggest just going for propane or MAPP if you have any around. I personally powered my first spray 'n' pray with a propane torch, works very well and gives a wide range of results.

The big problem with hairspray and other products is the residue.

Ah, I thought you were referring to altitude, not angle of launch and landing. Yup, numbers are for number crunching, so if you can produce a program in a reasonable amount of time that will be used often, all the better. I've personally never found it easier to write a program than crunch the numbe...

I'm confused by your post, Ragnarok. You mention a quote regarding elevation change, then relate this to drag? A formula for calculating range over different elevations can be derived using basic projectile motion equations, and it is possible to account for drag if you know the numbers... personall...

oooooooooooooooo thanks. I've been wondering where I could find a good phase diagram for things like nitrogen, oxygen, carbon IV oxide, and propane.

I agree, fork calc. And now that I figured out how to do the math for your gun... I should do it for mine and see if it matches my audio chrono estimate.

Chamber volume? The math I gave you is as accurate as most will get, and as accurate as possible without calculus.

Terminology corrected. Thank you very much for reminding me that I am still new to this and heading off much more confusion.

Not a coax, it's a tee piston. Seals against a bushing that the barrel screws into, so it can still actually fire a jet of air without a barrel, so not a true barrel-sealer, in that the front of the piston ends up slightly past the front of the tee in the sealed position. EDIT: And I checked today a...

Assuming that the 70 psi stays constant after you open whatever valve it is (which it doesn't, especially as the spud travels down the barrel, it may be worth it to calculate the jerk because the number I will supply here is greater than actual), the spud experiences an acceleration of 2.51 m/s^2. A...

Converting pneumatic to hybrid. Guess it's time to search the Combustion forum for metering devices...

As always, thanks very much.

Volume of air tank has no effect on force on the internals, just surface area and pressure. What are you trying to find? A certain force on part of the internals? If the materials you are using for your chamber will hold?

I recently (a few days ago) started working on my pneumatic (soon-to-be-hybrid), and modded it so that it is no longer seals directly onto the barrel but uses a very long piston that seals against a bushing on the barrel side, and into a nipple on the back end (using an adapter as stop). When the pi...

... wouldn't that just spin one way for a bit then reverse direction when you pump it again?