mark.f wrote: ↑

Wed Jul 07, 2021 8:22 pm

Weaponize the water heater.
In other news dope wall.

What an absurd suggestion! I love it!

Since posting i believe i have figured out my issues. I noticed that if I leave the gun sit for roughly a minute before firing it goes off reliably. I increased the chamber volume aswell. I am in the process of creating a "venturi" fuel mixing system to mix the gasses as the chamber is filled. With...

To install, you could blutack a piece of padded tape (non-sticky side) on a piece of 1x1 lumber, slide it down the barrel to the right spot, then roll the lumber over so the tape stick at just the right spot... rolling it out again might be a problem though if you overfuel... https://www.uline.com/P...

In my cannon I just used a piece of double sided tape that holds the ball firmly, but I have a bolt action... viewtopic.php?f=27&t=27104

that's a beauty! Can't wait to see it in action!

Wishing you many sharp reports!

Correct, meter pipe volume needs to be approximate, with the fine tuning of moles of propane to moles of oxygen being done by adjusting pressure in the pipe. If you find that you can't get the right load, you can change the length of a nipple on the pipe to add/remove 1/2"+, much as Latke said here....

I think I came to the same conclusion about 10 years ago... I assume you found this... it gives a good clue, but I still wasn't sure... I think he means volume of the propane (meter) is 4% and the volume of the air (chamber) is 100% The pressure regulator proved to be the key element. A mid range ba...

http://www.burntlatke.com/strip.html He is right about the veracity of the data, since his standard deviation from 10 shots is bonkers high due to the russet factor, but his data does bear out what we all know instinctively to be true, more sparks (well distributed down the chamber) = more higher i...

Pickle me grand mother. "big belly laugh". Dunno about ya tech thing variables golf balls. Yeah 750 mtr range... I av golfer, smak em 240 mtrs. When I get onto em , Its "Anzac" on the tee. One minute of silence, that is.... Gahahaha. I'd Rekon I give big red, prob 5 mins of silence after seeing it ...

sgort87 wrote: ↑

Tue Nov 07, 2006 3:23 pm

The fan should be placed on the other side of the spark gap or it is at large risk of being blown apart.

Fan at the back is problematic? Mine is mounted about 2 inches from the rear, never had a problem or had to replace it...

Easiest way to understand C:B ratio is that if the barrel is too short, the projectile is still accelerating when it leaves the barrel (sub optimal), and if the barrel is too long, NEGATIVE pressure behind the projectile will slow it down before it exits the barrel ( if your barrel is very long, and...

uninc4life2010 wrote: ↑

Wed May 27, 2020 9:30 am

Is your C:B ratio in terms of the volume of each?

Yes

Some photos!

https://photos.app.goo.gl/Z5Ko6nDGPsKwTVoRA

Awesome, can't wait to see it in action... 4th of July? Can blank it off in the back yard?