www.pulse-jets.com

Hollow stainless (304) balls in 1.5 to 6" If you get the catalog, they show up to 12" diameter. http://www.thomasregister.com/olc/SmartCat.aspx?&az=73226961&type=list_order&show=part_number+part_name+Dia+unit_price&number=7&showdiscounts=no&template=http://www.sharpeproducts.com/temp.htm&ptno=S150-S...

I never even heard of 'em, must be because everyone locally heats with electric or propane. I'll have to check 'em out.

Thanks for the tip!

Went to a local farm supply store and looked at a great many different spray tips. Unfortuneatly everything that looked good was either brass or plastic. Neither of which will take the heat. There's a much bigger place about 30 miles north of here, I'll have to try it soon and see if I can find some...

I'm going to fuel it with a stinger / wand. I expect this will be simple brake line with either a pinched end and cross drilled holes, or an attached fitting with holes drilled radially. Kind of a K.I.S.S. excercise. I figure the more exotic I go on my first attempt the less likely it is to even run...

Everything is mild steel. The ends are weld-on pipe caps, commonly used to finish off the top of posts. Kinda like the safety posts you'll see across the front of a wal-mart to prevent car / pedestrian impacts. Though wal-mart usually just caps them with a little concrete.

I'm finally getting back around to pursuing a pulse-jet project. I've had the itch for awhile now, but just not the time/money to scratch it. Have a look at the drawing and pictures below and tell me what you think of the design will you? Note, that I had to take the combustion chamber diameter up t...

Looks like an adapter to me. The fan blows through the cone into the hose. Why, I have no idea.

You can do that with an old points style automotive coil and just about any normally closed relay. Power the relay though itself and it will pulse very rapidly. Use that pulsing power to run the coil and don't forget the points style capacitor hooked to the pos side of the coil. I have used the blow...

What Larry said about wanting the fuel/air to stop just inside the chamber got me to thinking. While it isn't practical to stop the a/f you could almost completely halt it's forward motion. What I'm thinking of is taking an automotive exhaust valve and sticking it in the intake, with the intake not ...

mk- I kinda figured I'd build one with all the straight sections removable with flanged joints. Getting a perfect seal may be tough, but then I could fool around with the lengths till it works best. Nothing I make ever works right the first time- ever. Then again that's the fun of it. Oh and thanks ...

Most of the cheap round mufflers used in tractor / industrial applications have a perforated tube that runs right through it surrounded by fiberglass matting. I had planned to cut the tube free from both ends and pull out the stuffing. Just haven't found the right size yet. I was unable to find any ...

I feel that it would be an excellent idea if a lockwood were designed to be assembled from a grocery list of items which would be easily obtained by those without the means to fabricate them themselves. Such a design would of necessity contain some compromises in the name of using non-optimal parts ...

They're commonly called AN fittings, but there are slightly different designs that are extremely similar as well. Read here if you want to know more. http://www.parker.com/tfd/fittingsoluti ... TTINGS.pdf

Is that copper?!

I kinda figured the propane would cool it some, but also figured mild steel would be pushing it.

Has anyone considered making a propane "wand" long enough to reach down the intake and a fair ways into the combustion chamber? If you were running off of that, moving it in and out, couldn't you locate the sweet spot fairly easily. Seems like a low hassle way to test various nozzle designs until yo...