Anyone identify this valveless Pulse Jet?

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tufty
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Re: Anyone identify this valveless Pulse Jet?

Post by tufty » Tue Oct 18, 2011 10:26 am

Hi Jerry. Glad to see you back.

I'd just like to point out that it's not necessarily the case that TSFC for a valveless will be higher than for an equivalent sized valved engine (although that's often the case, and, in the case of the Thermojet, certainly is). There have been a number of valveless designs shown here in recent years that (at least claimed) to have a better TSFC than equivalent "valvers". That said, there's been more work done here on valveless motors than valved ones, those being "good enough" in most cases.

Simon

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Re: Anyone identify this valveless Pulse Jet?

Post by dynajetjerry » Tue Oct 18, 2011 3:36 pm

Hi, Simon,
Thanks for the update. To my mind, the chief advantage of valveless pjs is their longevity, a result of their having no moving parts. Because my initiation into p-js was use of (and working on,) the Dyna-Jet/Dyna-Fog, I've been most involved with similar engines. I'm still fascinated by all sorts of miniature engines, piston-type as well as pjs, and have a collection of both. However, I think John Swartzwelder owns more of all kinds than the next 3 collectors, combined.
Jerry
Louder is always better.

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