www.pulse-jets.com

Thanks for all of your kind words.... I am very excited to finally be able to pursue my degree (like I haven't been pursuing it already). I will be sure to bring my pulse-jets up to Ga-tech and fire them off, especially during hell week (finals). Anyway I have put some thought into a boiler over the...

WOW.... I got so wrapped up in finishing the engine that I had forgotten about this corner of the forum where I had somewhat detailed my build. Anyway I apologize as the engine has been up and running for a few months now. Because I was able to carefully design and test/prove the design in Autodesk ...

Sounds good in practice...

Well for the hell of me I cannot bend this 203 brass 0.25" OD thin walled pipe. I have even tried annealing it several times (which did soften a good bit) but the stuff still kinks like crazy. Any and All suggestions are welcome!!! I am shooting for a maxium bend radius of 0.5".

Wait you tap the stuff? I have been very skeptical about tapping it. Did you use fine or coarse threads?. In my case I would like to tap it using #8-32, what do you think? I would "think" since it machines so nicely, it will also strip nicely, regardless of how hard the material is...

I don't think its going to be a problem. Although derlin is not the best plastic for high temperature applications, there is a thick wall on my cylinders, and I don't expect them to be getting very hot anyway. I was also considering annealed UHMW (great thermal characteristics), but that stuff is a ...

Time for an update.... I am now at the stage of final assembly, everything has been machined. The valves and cylinders are supported by two machined pieces of white derlin. I machined my pillow blocks from aluminum and then tapped them to simplify mounting. Each one will hold two ball bearings. I am...

This reminded me of my first pulse just I built a few years ago. I too uses a shell for an intake. This was back before I even knew how to roll frustums so I just used some good old coffee mugs brazed together...

What hardware store? I work at Home Depot and have never seen that product, that's why I was curious....

What was the name of the product labeled "caustic soda". Where did you buy it, and how concentrated was the NAOH.

Did you make sure to add some draft into your molds?

With helium being non flammable, I do not see any problem. For extra caution, you may want to do it outside, to vent any remaining helium away. They put that warning on the bottle, because if you were to pierce a pressurized bottle, you would be in some trouble! I have punctured propane cylinders wi...

Is it just me, or did all of the attached pictures and files disappear? The file list is also no longer at the top. Is this just me?

I use the rival to Solidworks, Inventor. In reality I also use Solidworks, as I tend to have to switch between the two frequently. I prefer Inventor though, again pricey, but these 3D programs just do so damn much.... I am on the inventor BETA team, and have just started testing Inventor 2008, they ...