It's not water, but if I pass a cotton ball through the inside of the barrel, it comes out quite wet. Putting some water in a sound suppressor to enhance the effect is a well-known trick for firearms, the fluid helps to cool the hot gasses and thus lowers the pressure. I would not be surprised if i...

Excellent, that's a lot of cans perforated!

Gamification of social interaction, it fucking sucks. To be honest a little way of showing appreciation for a post without necessarily replying isn't such a bad thing in my estimation, the issue comes when posts are ranked according to likes/dislikes and there is an algorithm that sorts them accord...

hectmarr wrote: ↑

Thu Oct 20, 2022 7:04 pm

the tests at 20 meters, out of 4 shots, were only in 1 cans...

I hope the backstop was secure

the web is certainly in a dark place right now with perhaps darker times ahead. It's true, and it doesn't seem like it's going to get any better, your points about gaming neurochemistry are very accurate and it does not seem reversible. I suppose it's typical to bemoan the younger generations, but ...

Besides, my opinion is that the coefficient of friction should increase a lot, because the water deposited in the bore of the barrel That's a good point too, any water in the barrel ahead of the projectile is mass that has to be accelerated and would decrease performance. Perhaps a tank cannon styl...

perhaps going down the path of COOPERATION and not COMPETITION is more profitable. A simple project or a series of projects and not so much is the way to encourage participation. I mean, do it together. A chimera? perhaps, but surely it is trying to give it shape and viability. :) We did a bit of b...

hectmarr wrote: ↑

Mon Nov 07, 2022 4:45 pm

Why can't a compressed air-propane mixture burn at more than 28X? I didn't know this, and I don't understand why...

It will burn at much higher mixes but if you are fueling with the propane at atmospheric pressure, then 28x is the highest mix you can achieve.

Finally found some time to think about this and I'm happier with this design: https://i.imgur.com/lTrSFY0.jpg Started to work on it this morning and the lathe motor decided to misbehave... https://www.youtube.com/watch?v=SQBKHBAlLGM Looks like a capacitor/centrifugal switch issue, to be investigated...

If in a closed chamber I manage to introduce propane and compressed air within the range of stoichiometric proportions, at 100 bar, with a proper ignition, will it explode? :? With the right ignition it should, and we have proof :) I don't know if you're aware of this example that was shooting at u...

I don't know if anyone has made a specific side by side comparison, but while the ratio of oxygen to propane is the same in both cases, there are important differences. Working with pure oxygen is a lot more dangerous so it is less practical, and there is a danger of DDT especially at higher mixes. ...

Firearms generate tens of thousands of psi of chamber pressure, so if you keep the same caliber and projectile weight, achieving similar power is impractical with a hybrid. https://i.imgur.com/32QQPsG.jpg Using a 50x mix and a 30 inch barrel with approximately 2:1 chamber:barrel volume ratio, I got ...

I hope it is something simple the problem of your machine. It looks like it :) It's a doubIe capacitor motor, I took it apart to look at the centrifugal switch and nothing seems to be broken or dirty: https://i.imgur.com/Kr3p9NZ.jpg https://i.imgur.com/nWkxZTf.jpg Of the two capacitors however, acc...

Looking good! I assume that in the interest of safety you've made sure that all the pipes and fittings are rated for the expected pressures after ignition ;) I note that while the paper you shared concluded that "When the volume of the initiation end is larger than that of the booster end, you can g...

yyt wrote: ↑

Fri Nov 11, 2022 9:54 am

Your love for this hobby is admirable!

Many things have come and gone, but the pleasure of blasting holes in things is difficult to beat

It's a shame that this sort of practical hobby seems to be in decline with modern generations.