I think you both have good points, i think the problem might be the access to smart phones etc from early age. Kids learn that that is where fun comes from and it results in them not eating mud or doing anything practical to build up their creativity and curiosity. I think future generations is goin...

I remember a few years ago, this forum was booming.. A thread could have ten-twenty replies by different people each day. Something must have happened. Maybe teenagers today are to caught up in drinking and partying, atleast that is the case in Norway. Thank you for your input, I will consider it es...

Double post so someone may look. Is it just me or have the forum lost alot of activity over the last years? If so, does anyone have a good explanation as to why? It's a shame.. I am now done drawing the plans, and would like to share the chamber design for your input. I am thankful for any improveme...

Methane as you say is a more suited fuel for this kind of gun, but as I said I dont know of any way to get my hands on it over here. I think I conclude that propane burns even as a liquid when sufficent oxygen is present. The dieseling issues is not really a concern to me, I cant imagine alot of hea...

Good points Ragnarok. I have decided to go with the hydraulic method as this would enable me to do fueling remotely, and the compression will happen very slowly so I doubt dieseling should be an issue. I do not want to involve pure oxygen, so I will simply try and see if it works. I would think that...

Hello Jimmy! Yes you are missing something, if you have a chamber with a volume of 100cc and you pressurize it up to 0.84 atm you have 84cc of gas in the chamber, that would equate to a 20x mix. When you are adding 836ml you are actually putting in eight times the chamber volume, hence you will get ...

As Ladra made it to 190x mix (i dont recall if he used pure oxygen for that shot though) it should be possible as his mixes did not liquify. I do think I have shot mixes with a higher preignition pressure then the vapor pressure of propane in the past, but I am not sure of this. To long out of the g...

Hello again Spudfiles, I don't know if any of you can remember me as I have not been active on these forums for years! However I am lurking from time to time, but not nearly enough to catch up. Now I am back with a question for you to answer. Presuming you would like to build a high mix hybrid that ...

Bump

I do like your design Fnord, looks like it will work and perform as a dream..
The design is also pretty simple and could easily be made by most in this forum.

Now get crackin!

Good job on your project! I always wanted to try making a hybrid rocket to but I never got around to it. One question, how does not the combustion pressure press the oxygen back in the regulator or destroy any of your gear? Might be a silly question.. Next step for your is to make the gasses do work...

11.77 mm is the dimension quoted for the long army so allowing for barrel compression it would seem this is the one. Amazing to find it outside your house! Yepp, I am pretty sure about it now as I asked on a Norwegian black powder forum. It is very likely a 1860-1867 bullet as just about all of the...

Were do you hunt, i never find stuff All those where found within 200m of my house. The coin was found on a very old road. possibly this type of gun? My first thought but it would never get to Norway. Fascinating! Indeed! Sounds like quite a rare find in any case! There can`t be too many around, no...

Hello, I got my metal detector two days ago and needless to say I went right out and tried it. I found a lot of .22 bullets so I decided to go somewhere I know I haven`t shot and... I found a hexagonal bullet and what appears to be a musket ball. I remember the hexagonal one being deep, around 8-9" ...

Atleast I think your doing good. You dare to try the (Almost) untried, and that`s what progress is made of.
Also think you have very good build quality, seems like you take your time.

Good luck, if it works as expected, try the highest mix you can
You might actually be able to impress DYI with a 200x BB shot, and he`s hard to rival with in that playfield!