www.pulse-jets.com

I have used this material. It is strong but tends to be brittle, so I recommend a stiff fitup prior to application of the Thermosteel. The material is sodium silicate reinforced with granulated steel. Sodium silicate forms a glass-like mass when dry; that is why it is commonly called waterglass. Al ...

I have not used My tig setup on AC. It should be ok on AC.

Al Belli

I built a HF control and Argon postflow circuit assembly which works if You do not have the HF operating. As soon as the HF comes on, the 555 timers lock up and do not shut off. I have even tried isolating the inputs and outputs using electromechanical relays, and that did not work. After much exper...

Here is a sketch showing a typical setup for measuring pulsed flows.
Al Belli

Hi,
Use 1/4" o.d. tube for the outside coil, ans the solid wire that You have for the inner primary coil.
The spark plugs that I used are non-resistor type spark plugs.

Al Belli

Hi, High frequency travels on the surface of conductors, so the 1/4" tube is much more efficient than a smaller diameter conductor. You need not have the spark gap any larger than .040". The starting sparks may appear to be quite small, but with the argon flow, the arc will start very easily. Excess...

Hi,

Wirewound resistors are what I used in My welder.
They work very well in this application.

Al Belli

When I worked at Bowles Engineering during the mid 60's, a gentleman I worked with was trying to build a pistonless outboard motor based on the pulsejet principle. Ray Bowles was encouraging Him to try it. While assisting him in doing some testing, He told Me about a giant waterpump somewhere in Eur...

Hi Capt,
The transformer unit is ok. Start with a spark gap of about .030".
I made My spark gap from two spark plugs with the ground electrodes removed, and mounted with the center electrodes facing each other.

Al Belli

A simple to machine turbine wheel can be made by ballmill drilling a series of angled holes from both sides of a disk. The nozzles can be finished to size by using diemakers tapered pin reamers, which also gives a nicely tapered inlet to the nozzle outlet. The turbines can be staged, but the nozzles...

Here's a circuit using a different coupler for the HF on a plasma torch. The reactor ( L1 ) is diagrammed as an iron core inductor, but in a photo of the unit it appears to be air core. I prefer the isolation of the high voltage system provided by the " Tesla " dual coil design. No 60 Hz. 12,000 V. ...

I use .024" stainless steel Mig wire that comes on a spool.
It works very well on 24 Ga. stainless.

Al Belli

Hi, I use an overlap on circular joints; make one tube fit over the other, and You have a lap joint. I use about 1/4" overlap. You can also make a thin backing ring to go inside the tubes, which acts like a lap joint. Or if You prefer, the ring can go outside the tubes, and it will do the same thing...

Hi,

The following attachments show a lap-seam weld on type 304 stainless
.024" thick, using 20 A. and a 040" ceriated electrode. I varied the
feedrate to show the increase in bead width. Note the full penetration at this current and speed. No filler rod was needed.

Al Belli

Hi Capt,

The alternator produces AC and is rectified by the internal diodes.
You can obtain AC by tapping off before the diodes, thereby eliminating the need for an inverter.

Al Belli