www.pulse-jets.com

Mike Everman wrote:go to mcmaster and look for hypodermic tubing. goes down to .004" id, .002 wall. That small enough? ;-P

Mike, stainless tubing won't work inside the pipe -- see my article in the last issue of jetZILLA:
http://www.jetzilla.com/Vol01Num06/jetZ ... #Article_1

L Cottrill

Mark, that's a Super Tigre needle valve, modified by cutting off the fancy machined stub at the 'interior' end. See the Maggie Muggs site at http://bz9.com/Maggie [the 'short link'] -- click on one of the links to Page 2 and scroll down a bit. [Well, OK, I'll post the pics here too. Note the little ...

Mike - Your reference to the aircraft pitot tube reminds me of how silly it was of me to expect a reasonable gauge pressure from the leaf blower airstream -- the fact is, a person blowing into an aircraft pitot tube can instantly ruin the air speed indicator [the instrument mounted in the panel], fo...

Doggone it, Mark, how come they don't make any small-diameter tubing? I STILL want to get average pressure measurements inside the pipe and chamber!

L Cottrill

Viv & Bill - One thing that I think becomes really self-deceptive in testing our own engines is the business of relating thrust to fuel consumption. Most guys will run for maximum thrust, because that's what everybody always wants to know -- how much thrust did you achieve? There is also the ancilla...

Mike, what do you think that thing weighs? At 2300 PSIG, I would think that would be a pretty heavy-walled piece. What does the material seem to be?

L Cottrill

What you have shown there is basically the same as my 70- or 80-year-old Model T Ford spark coil, except that in the Model T coil, the ferric core of the relay also happens to be the core of the high-voltage coil. I can tell you from years of experience that this basic plan works beautifully, with o...

Here's my old Electrovoice DL-42 Dynamic mic. It was designed for things like film recording, where you want sensitivity over a narrow cone out in front, without picking up nearby noise sources off to the side [like camera noise, for example -- yes, we used to use cameras that were mechanical device...

I have finally obtained what should be a suitable air supply for testing Maggie: the mighty Black & Decker Leaf Hog blower/vac. Maximum velocity is 215 MPH, which I hope will be far more than adequate. Naturally, I can't remember the CFM now, since I didn't write it down, but it seems enough for bot...

Ray - My hosting service was battling against a DoS [Denial of Service] attack for a couple of days -- things seem to be working now. Glad you like the photo. Some people think I should try selling it as a poster. A way to capitalize the experimental programs of Cottrill Cyclodyne Corp -- Ha! I'll b...

Pablo & Psignorian - Sorry I haven't looked in here much lately -- I just now noticed your posts. Maggie is still untested, BUT the horse barn is finished and my day job is FINALLY easing up a bit, so it looks like I should be able to start work on a decent thrust-measuring test stand for maggie. I ...

Mark - That would be a violation of the Terms of Service Agreement between the author and me. Besides, there are a couple of good reasons not to do this anyway. Note that this book INCLUDES re-sale rights, meaning that once you download it, you are free to sell it or give it away yourself. That woul...

SORRY - I forgot to mention the important detail that this e-book is an EXE type e-book, NOT A PDF -- so, it will only be usable on Windows systems, not on a MAC. I will edit my original post to reflect this, so this important detail will not be missed. If you are a MAC user and want to participate ...

Friends, If you are interested in the marketing of any product or service on the 'net, here is something you should grab hold of: the power-packed 59-page no-fluff handbook of viral marketing, Viral Marketing Secrets by Paul Hancox. Here's how you can get this $19US e-book for the reduced price of F...

As the great Yogi Berra once said, "Slump? I ain't in no slump ... I just ain't hitting." Yes, I am still alive and well, relatively speaking. This is the first time I've stopped to look at the forum for a couple of weeks, I'd say. Our group at work [yes, there is a day job] is swamped, largely due ...