Kazoo gone Chineezy

[Mike Everman]

I'm thinking of doing a Chineezy variant with a semi circular Kazoo smash, as shown. Solidworks chokes on trying to hollow this model out, so that's why it looks solid. Should be a fun build up, and I think it's nice that the intake and exhaust are concentric.

[Bruno Ogorelec]

Ohmigod... what will the fertile mind of a pulsejet enthusiast come up with next? Maybe Klein bottle pulsejet? I bet no one has tried that one before.

I am surprised, however, that no one but Mark seems to have tried simply sticking unequal pipes onto various metal cylinders.

[Graham C. Williams]

This should be an interesting build.
Will the hot air from the exhaust change the induction flow and mass/density of charge?

Graham.

[Bruno Ogorelec]

This should be an interesting build.
Will the hot air from the exhaust change the induction flow and mass/density of charge?

Graham.

Yes. The proximity is likely to have some influence. The extent will depend on so many factors, however, that I don't think a general conclusion can be made.

Just consider the fact that a horizontal position (both ports in the horizontal plane) will change the conditions markedly in comparison with the vertical position shown on the picture.

As I have argued before, I don't find that important. If the density of charge is smaller, use a bigger engine. For the same static thrust, everything else also being equal, a bigger engine ingesting hot air will have better fuel economy than a smaller engine ingesting cool air.

We should attempt to master preheating of charge to lower the fuel consumption. My conceit is that the thrust per engine volume -- which will be reduced -- hardly matters, given that (a) volume costs almost nothing and (b) bigger volume engines have lesser pumping losses and are less temperamental and easier to work with.

[Al Belli]

Hi Mike,
Your design looks a lot like the bent Kentfield that I did a layout of for consideration in the Nord 1500-II Griffon project I am working on.

Al Belli

[Viv]

Hi Mike,
Your design looks a lot like the bent Kentfield that I did a layout of for consideration in the Nord 1500-II Griffon project I am working on.

Al Belli

The Bentfield! ah man that does it for me! consider it christened:-)

Viv

[Bruno Ogorelec]

Yes indeedy! Bentfield. I almost spilled my beer when I read it.

[Mike Everman]

"Bentfield" LOLOLOL! Classic. I read through the entire Sunday funnies and that was the best laugh. ;-)

WRT my "rice burner", I'll be doing some math and building this coming week. Wife and kids heading out for a few days, mwa ha ha.

[hinote]

WRT my "rice burner", I'll be doing some math and building this coming week.

Mike--you're going to have fun trying to get one of these figured out.

I spent some considerable time and effort on it last year, with no success--but I still think it can be done.

I call this general config the "Thermojet" type, because that is the most obvious successful version; Melenric also applies, and maybe the Chinese too.

The problem with designing one of these is that the intake column of air continues into the combustion chamber, making it difficult to decide on actual length requirements. The best choice then becomes designing-in a way to accomodate easily changing the intake tube length for experimenting with--then tie it down later.

Also, note that all operating examples of the type have their fuel delivery located directly in the intake tube.

I would try to duplicate the dimensions of one of the historically successful engines first, to keep the chances of your success at the highest possible level.

BTW this general config lends itself well to "concentric" solutions.

FWIW

Bill H.
Acoustic Propulsion Concepts

[Al Belli]

Hi Guys,

I was considering " Lockrevisse Monster ", but " Bentfield " seemed so much more descriptive!!!!

Al Belli

[Mark]

Mike,
Not a bad variation on the Mash-o'-dyne theme.
Mark

[Nick]

er, just a thought on the Machine Mart (Clarke)TIG. I think this is a model i considered a couple of years ago, but it only goes down as far as 20amps. You will need the slightly more expensive scratch start Togs that go down as far as 5 amps, trust me you can almost weld tin foil with them!, I regulary weld 0.5mm mild steel with mine.

Just dont want you to waste cash on something that might not work.

Nick

PS Viv,.........."Bentfield!"....... brilliant Mate!.

Hows the house hunting?

[Viv]

er, just a thought on the Machine Mart (Clarke)TIG. I think this is a model i considered a couple of years ago, but it only goes down as far as 20amps. You will need the slightly more expensive scratch start Togs that go down as far as 5 amps, trust me you can almost weld tin foil with them!, I regulary weld 0.5mm mild steel with mine.

Just dont want you to waste cash on something that might not work.

Nick

PS Viv,.........."Bentfield!"....... brilliant Mate!.

Hows the house hunting?

Still very tempted by the £7k cabin by the river mate, will let you know.

Viv
Did I send you a pic of it?

[Mike Everman]

Thought I'd resurrect this thread for the photo and video of the test of (a)Kazoo gone chineezy. Worked well first time out, kind of weak, but may be fuel starved or the fuel stinger is too big or too small or I don't know. I haven't got a pinch on the intake yet, and I want to shorten everything incrementally, etc.
Here you go, Scott thought thought running it on a rainy day was "cool".

I think it's cool because it's proof you can convert a Locky type to a Chinese type with all the same stuff, just switched around. Graham had suggested to me that a Chinese was this very treatment of an escopette; I must agree.

[Mike Everman]

Oh, yeah, that video has the "max headroom" effect, courtesy of Windows XP Service pack 2!