www.pulse-jets.com

...Plus as the engine heats up, the ceramic will expand faster than the steel, putting pressure against the shell and eliminating any kind of structural problems. I thought steels had a far higher coefficient of thermal expansion than ceramics, by several orders of magnitude (particularly Al2O3)? M...

Are you SURE aboout Tungsten Carbide heat shield tiles covering the space shuttle?!? It's incredibly heavy (S.G. = 15.63). That's a lot of mass on a space shuttle. This doesn't seem quite right for aerospace vehicle, where every lb counts...If it's true I'll be shakin' my head in amazment... Have yo...

Here's what mine looks like: As I said I replaced the cart's original perf-metal deck with a 4-inch C-channel and welded half-round's on the underside to help hold various engines in place. When testing, I can change out an engine in a few minutes this way. I use those vise-grip chain clamps (also f...

Lookin' good, Mike! I can't wait to see a video of it running, and see how the operating frequency compares to mine. This version looks like the exhaust has been elongated slightly, and seems to have a slight restriction at the exhaust throat? Also, from your photos, the bustle looks a little bigger...

Also note: Let it stand for several minutes AFTER mixing and BEFORE application. The manufacturer says that there is a chemical reaction that occurs between the methanol and the flux, and this waiting period is necessary to give the reaction time to occur. On really hot days I cover it during this w...

I dont even know where to begin to measure the thrust. New to jets but great welding and fabrication skills and having a mandrel bender makes things pretty easy going. You can make a very simple thrust stand from one of those cheap (Harborfreight.com -- "steel mesh deck wagon" ITEM 38137-3VGA) four...

My shop vac died the last week..... I was sitting on the couch dieing with a way to fire the beast up!!...Jim The original Thermojets would start without any air injection at all. You just light one of the two injectors and slowly turn up the propane. Those injectors were different -- they did not ...

It already runs great with just 1 tank. And its not galvanized, its aluminized steel. I know all about the toxic fumes of galvanized. I know all about welding, I can stick, tig, mig, flux core, etc.... Very good. In the photos, some tubing looked aluminized, and some looked galvanized. Sorry for my...

One last bit of (unsolicited) advice and then I'll leave you alone... It looks like you're using standard electrogalvanized muffler tube for your motor. I'm sure you're probably aware that TIG welding Zinc-plated metals is bad for your health. I etch the Zinc off before welding with an acid dip. Som...

...Was looking at your pictures again...just a bit of advice, feel free to ignore it or take it with a grain of salt...But when you get that engine really going, so that it's glowing orange, you may have trouble with the heat affecting (softening) your black neoprene fuel hose. It will help to dista...

I think your engine looks great. It should run just fine, but you may find it helpful to to use two BBQ tanks or a forklift tank to fuel a motor that big. I like the way you joined the straight sections with flares -- very quick to build that way and no cone rolling required. Do you own a muffler sh...

Jerry, I noticed from your posted photos that it appeared that, as of the time the photos were taken, the only valveless pulsejet engine that had been run was your Hiller-Lockwood with the attached Inlet thrust augmentor. When you ran it, did you collect any thrust data, and perhaps the correspondin...

jerry marra wrote:...Hiller/Lockwood-Thermojet- Free piston – Glueharef pressure jet - custom design Escopette ...

Nice pictures, thanks!

I didn't see the free-piston engine or the Gluhareff...do you perhaps have more pictures?

You seem to have a ready supply of the stainless sanitary flange fittings -- nice!

Cheat: Just an FYI...That U-bend I made in the photo shown above is the same wall thickness as the tubing shown in your second photo; about 0.065". I made that weld at 75 amps. Anything below 50 and you'll risk burning through, because you'll have to go too slow. I admit that 75 is a little high, bu...

perhaps stainless just welds ugly... I really don't know. 'Cheat' : Stainless welds beautifully...just takes a little practice -- See attached photo of 180 degree U-bend made from two 90 degree sections of 304SS. It was TIG-welded without filler. Lots of people can give you dozens of tips, but ther...