Nice job!!!

It doesn't take much of a web presence to host online code. But if you don't already have a web server of some kind then it is definitely a barrier, plus cost $20/year forever.

Perhaps SpudFiles could be the long term host?

Go for it.

But how will you measure the diesel?

The MOST critical thing is the correct amount of fuel. If you are off by 10% the gun won't ignite, let alone fire. The correct amount of fuel is much more important than what the fuel is.

What is it that you would like to know?

It will most likely to decrease performance. Mostly because of how hard it would be to accurately measure. In general, hydrocarbon fuels have nearly identical energy contents per unit air. http://www.inpharmix.com/jps/Combustion_fuels.html The only outliers are Hydrogen (not a hydrocarbon) and acety...

A mesh screen would kick up turbulence but also suck up a lot of heat. We have discussed before if running the chamber fan during firing might increase the burn speed. Way back when I measured burn speed in a closed chamber at 1x with/without the fan running and with one or three sparks gaps. There ...

The point is to know how to solve problems (not just this problem) without resorting to magical numbers specific to only one problem, like 22/15. Dimensional analysis is based on the most fundamental mathematical fact: you can multiply anything by "1" without changing the underlying amount . If you ...

300 meters is a long way. Remember that a pneumatic is probably going to be operating at less than 150 PSI, which is the max pressure of a typical shop compressor. Compare that to a typical 0.22 rifle that has an effective range of about 150 yards. That low power rifle operates at twenty thousand PS...

1. Yes, fueling with a syringe is reproducible. 2. Shot to shot variation should be less than 10% in muzzle velocity, if you are using consistent ammo. Spuds are generally not very consistent. :) 3. Depends on what you mean by "long range". For anything powered by gases with a smooth bore and non-ae...

getgray wrote: ↑

Wed Oct 12, 2022 11:09 am

Fun fact. PVC shrapnel does not show in an X-ray. That should answer the question if the data sheets from the manufacturers weren't enough.

yes it does
http://news.bbc.co.uk/2/hi/americas/6064692.stm

what you are describing makes no sense at all. Simply squirting in from a torch with a mixing head is a terrible way to fuel. Makes zero sense.

It's simple. You use a propane Torch to ignite ? Use it for fueling ! Propane torches make the perfect mix by using the Venturi effect. The Problem is: A Venturi mix has to flow without resistance, so it can't be used with a loaded barrel....normally. But if I use a "over pressure" valve (we use ch...

Gaseous fuels are usually pretty picky on the ratio being correct. For propane the combustion limits is about 3% to about 8% propane to air by volume. Outside that range the fuel-air wont ignite regardless of your ignition source. A meter pipe is perhaps the most elegant approach but overly complica...

Lower barrel friction might actually lower cannon performance. For combustion cannons the friction (especially the static friction) contributes a lot to performance by holding the ammo in position long enough for combustion to proceed and pressure to build. Combustion is actually a pretty close proc...

I tip my hat to the Mythbusters, but I have to say I believe it is entirely possible. The Mythbuster ice bullet was brittle because they did not deaerate the water. A very cold, deaerated bullet would be hard, and not melt when fired. Speaking as a formulation chemist, Any problems with the ice bul...