For this project volume is more important than pressure. I would like to evacuate 55 gal drums with rusty sediment. The water pressure at the garden hose spigot measures about 40 psi I think. I can’t visualize the easier to build pump you described. Is it the classic venture shaped flow meter type o...

I want to machine a jet pump eductor out of bar stock. The main problem is coming up with a venturi shape. I don’t have any bar stock so I was thinking about making some by casting a material in pvc. I looking for something that is easy to machine Here is what it looks like http://sti.srs.gov/fullte...

Thanks for the help everyone, I thought about some of the suggestions and Technician and jacks were right. Here is what I found 1) The marbles are so snug in the test tube that they are practically water tight. 2) The test tube is overheating because the syringe has too much friction. Thermal expans...

Greetings, I am a immigrant from the old spudtech forum. I came here looking for some troubleshooting help with my latest project; a test tube sterling engine. The air in the test tube is definitely expanding, the problem is that the syringe is not retracting or the air isn’t cooling. I can’t figure...