www.pulse-jets.com

That is assuming that you can make a valve system 1.3 mm in diameter. Just make sure you make the valve holes big enough to fit the O2 molecules through ;)

Well it appears to be the basic design of a craft jet engine, except the tailpipe was drastically shortened. The valve system is the same, the combustion chamber is a little shorter, but other than that I would say it is the same design family. I therefore would conclude that it most likely will not...

Do you mean how did I enter the data in the program, or how did I come up with the equation? Well anyway you could just use excel's goal seek to have the program vary one thing to achieve another. Just put the length of the tailpipe in and have the computer vary thrust and you will get it.

Eric

The frequency range would be about 850 to 900 hertz. It would have to be made very well with very precise fuel control, but it is possible, in theory. The smallest engine i have ever heard that supposedly runs is 7.5".

Eric

Yes it can calculate the weight based on what thickness and type of metal you plan on using. I could not give a estimated weight of the entire engine including valve head since the volumes of the different types would be so different and different sizes would tend to lead to differnt types of constr...

Well I tried to reply earlier but my computer crashed after writing up a nice big post... So here it is in the shortest possible way. The diamter of the combustion chamber is not equal to its lenght. It is goverened by the dimensions of the valve system you make. Three recomended dimensions are give...

Well I may be a little partial on the matter, but i reccomend using my calculator. Bruces calculator does not tend to produce engine dimensions that are even close to what real world engines should be. Plus my excel program has a bit more to offer. What matters most in designing a pulsejet is the ta...

Well the website has been "temporary" for quite a while, I havent had time to finish up coding the new site or to update the old one. Im afraid until I learn JAVA I wont be truly happy with it. Im not sure what you would call the valveless dynajet, I just want to do it to see if it can be done, plus...

Hey everyone, Havent had time to do much PJ research lately, The other day I decided to try to turn my old dynajet test engine into a fully valveless linear lockwood variant. Im using about a 5" intake tube, I think if i use a smaller diameter it will run on its own without forced air. As of right n...

I agree that building a 200 pound thrust engine is not a good idea for your first engine. I would go for a 100 pound thrust engine and if that works well then maybe make a second one if you want your gokart to launch like a v-1... Remember that the V-1 engine only produces about 800 pounds thrust an...

Wow that sucks. Really cant invent anything new these days. I better stick to nuclear fusion propulsion systems, not too many of those are around yet. Maybe if I just jump right to warp drive, but im sure someone has patented it already. The great thing about a patent is that the object doesnt reall...

I finally got around to working on the new engine design that I posted around a year ago. Hopefully it will work well. Should have it done sometime this spring, depending on wether or not the weather stays abnormally nice. The valve mass should not be an issue since the force on one side will help o...

I started the engine with all the petals, one was pretty damaged and I knew it was not going to last. After the engine got orange the damaged petal flew out the back at about 600 mph! It kept on running. I was trying to get it to run until the valve failed completely but I never got that far, about ...

It is Eric Beck's calculator! ;) If you have access to CNC equipment then you shouldnt have a problem getting the wedge shaped intakes accurate. I am assuming that you are going to use the "high efficiency" petal valve system, for an engine producing 25 pounds thrust I probably would of picked a val...

I dont want to spend a lot of money for a tig, and from what I have seen by an very competant professional welder even tig doesnt really work well with anything above 20 gauge stainless... If you can stick weld stuff that thin without burning through please teach me how! I have tried large gas torch...