www.pulse-jets.com

Larry, Thanks for the PJ pic. So perhaps the real question is what kind of temps can JB stand up to. I've just begun experimenting with 'furnace cement' myself, though I cannot give any recommendations yet positive or negative. It is supposed to be good to 3000 odd degrees though, and I was suprised...

Larry, Thanks for sharing all of your info. Maggie...she is a beautiful machine! One thing I don't get is how the JB Weld will hold up to combustion temps. I readilly admit that I know little about this wonder welder, but I would imagine if the engine works well, that it will be glowing hot. Will JB...

For .024" stainless, You want 20 Amps. with a travel rate of 21"/min. Straight argon at 6 to 8 CFH flow, and .040" ceriated tungsten elctrode. Wow! I can't get any kind of welding done on such thin sheet with such a big electrode/amperage. I use .020 thoriated electrode and 5-10 amps on my Lincoln ...

Luc, I count three missing: Mike's very interesting quote of Andrew, Viv's, and Yours, all dated Mar 24, I believe. I also see numerous posts missing from other forums. I was hoping to explore some of the thoughts raised in the Andrew quote, but without the original, it is difficult Regards, Raymond

Dave, Viv, Getting at the physics of these engines has been a long quest for me. If you model them simply as a ramjet, with a fuel jet induced airflow, then they are pretty easy to analize, and I agree with Dave's assesment of a max pressure ratio of 1.2:1 (I get 1.26:1 with a 165 psi, 1200 F resevo...

Hi All,
Just got back from taking the kids to Disneyland. Any new news? The list was quiet today, and I'm hoping that's not bad news.

Regards,
Raymond

Hi All,

I'll be out of town for several days, so just wanted to wish good luck/bon chance! When I get back I expect to read all about your successful tests and your 130 lbf thrust Gluey :o) !!!

Later,
Raymond

The Dynajet I have is a 9 mm thread and a nut. The nut is screwed on the spark plug after you insert the plug into the hole in the combustion chamber, no welding is really needed. Just a tiny wrench inside the combustion chamber to hold the nut steady as you tighten the spark plug with another wren...

Mike, Thanks for sharing your Kazoo work. Very interesting. I was considering an ignition setup similar to yours for a little 'burner' I'm playing with in the garage. How are you getting the sparkplug to screw into the sheet metal? Have you welded a boss? Do you tap the thin sheet metal? Also what i...

Luc, Do I need the Solid Works Viewer plug-in to see the coils file? All I'm getting is gibberish when I try to open it. I'm downloading SWV now, but have a slow connection so will take awhile. Viv, Luc, Nice to see you guys tip your hand. Thanks. It helps me give some (hopefully) constructive input...

Viv Wow quick edit needed! I searched but there was lots and lots:-) got a URL for that buddy? Sure do. It's http://groups.yahoo.com/group/homebuildturbines Wow. If you havn't heard of that list then maybe you aren't aware of the Gas Turbine Builder's Association, based out of the UK? They're at ht...

Viv, Luc,
Well your work sounds interesting. I hope your flameholder or baffle or whatever it is that you won't tell us works when you retest on Friday. Good luck :o) I hope this is it!

Regards,
Raymond

Hi Viv,
Funny you should bring this up right now, as this subject is going quite strong on the HomebuiltTurbines group in Yahoo. You might want to take a look if you aren't already there.

Regards,
Raymond

Dave wrote: Maybe this design didn't scale well and was marginal and sensitive to tune. I have thought about this and wonder if it is a boundary layer issue. With the smaller designs, boundary layer growth in the ejectors will change the effective length/diameter ratio more than in the larger ones. ...

I can't remember the guys name right now, but he is in the G8-2 tech manual. As I mentioned he wasn't very scientific, but he did mention checking thrust by pushing against a scale with the aiplanes nose. he had gone through a few iterations to get the engines to run properly. He implied that Uegen...