07 series comming along...

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mk
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07 series comming along...

Post by mk » Mon Jul 25, 2005 8:00 pm

Just two pictures for your enjoyment.

Depicted is the upcomming "K-PT 07c" engine.
Attachments
K-PT_07c_con_2.jpg
Whohoo. Sections welded up. Joint plane and shape finishing still to come...
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K-PT_07c_con_1.jpg
A few hours before the second picture has been taken. Almost shiny and new 1mm thick mild steel sheets.
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re: 07 series comming along...

Post by Dave » Tue Jul 26, 2005 10:50 am

Marten
Moving up to bigger game?
Dave

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re: 07 series comming along...

Post by mk » Wed Jul 27, 2005 9:07 am

Three close-ups, after having finished the duct yesterday.

It's actually not that big, but looks pretty neat, IMHO.

Only one burn-through (and within rough internal spot) happend during welding up everything. So it's in the combustion chamber section, it shouldn't be a problem. Else the internal surface is pretty smooth. I'd say my best piece of work so far.

Further information as e.g. an overall picture might follow when the engine performes as desired.
One hint: As you can look through the engine, it's obviously not a Chinesy design.

Stay tuned.
Attachments
K-PT_07c_rear_view_during_con.jpg
Photograph taken just at the tailpipe outlet port. Construction wasn't finished at the time the picture was taken.
K-PT_07c_rear_view_during_con.jpg (21.03 KiB) Viewed 6159 times
K-PT_07c_tailpipe_joint.jpg
Should strengthen everything a bit.
K-PT_07c_tailpipe_joint.jpg (30.49 KiB) Viewed 6161 times
K-PT_07c_front_view.jpg
Picture taken just a couple of centimeters or inches in front of the inlet "mouth".
K-PT_07c_front_view.jpg (32.42 KiB) Viewed 6163 times
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Bruno Ogorelec
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re: 07 series comming along...

Post by Bruno Ogorelec » Wed Jul 27, 2005 1:08 pm

So, you are persistent in the development of your 'clarinet jet'. That's commendable. We are all jumping far too much from design to design. This is much better. I remember your older engines being extraordinarily loud. Hope your hearing lasts through this one. Good luck!

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re: 07 series comming along...

Post by mk » Wed Jul 27, 2005 5:26 pm

Well, the "clarinet jet" of the "burning grape" is still at Mike's.

I put it aside and am now considering it as a "lesson learned engine".

Actually, the present design does not have a lot in common with the one you mentioned.


However, what's the color in the following picture telling you, eh?
When knowing that I did not move out of my neighbourhood.

Now other questions need to be solved.
Attachments
K-PT_07c_after_first_short_sustained_operation.JPG
Title should answer the question of the post above.
K-PT_07c_after_first_short_sustained_operation.JPG (25.11 KiB) Viewed 6120 times
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re: 07 series comming along...

Post by Bruno Ogorelec » Wed Jul 27, 2005 10:45 pm

And the Bundespolizei did not come running? :o)

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re: 07 series comming along...

Post by mk » Thu Jul 28, 2005 12:52 pm

Not yet.

I cannot complain about my neighbours, but I refuse to run engines more and more. They're just too loud.
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re: 07 series comming along...

Post by Graham C. Williams » Fri Jul 29, 2005 12:22 am

Dear Marten.
I'm glad to hear that you've had some joy.

Graham.

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re: 07 series comming along...

Post by mk » Thu Aug 11, 2005 10:02 pm

For the interesed,

I did some short qualitative trial and check runs of the "K-PT 07c" today. Well, what can I say?

The engine started very easily without any forced air and beaved quite nicely. Further field tests and tweakings are still required, but I'm pleased at least so far.

Of course, the self-starting trick was not my invention, but I have to thank the people who offered the fundamental trick to me.



Besides, post no. 800 of mine.
Attachments
K-PT_07c_true_glowing_color.jpg
The forbidden fruit...hot as fire to the tongue, sweet as candy to the eye.
K-PT_07c_true_glowing_color.jpg (84.26 KiB) Viewed 5984 times
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hinote
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Re: re: 07 series comming along...

Post by hinote » Thu Aug 11, 2005 10:36 pm

mk wrote:
I did some short qualitative trial and check runs of the "K-PT 07c" today. Well, what can I say?
Marten:

Nice going!!

If it gets any hotter, it'll melt like taffy (candy)!

Seriously, the primary combustion zone looks really good.

We're making progress.

Bill H.
Acoustic Propulsion Concepts

".......some day soon we'll be flying airplanes powered by pulsejets."

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re: 07 series comming along...

Post by mk » Sun Sep 11, 2005 11:16 am

Field tests done.

A lot of injector designs were accepted. The engine also behaved very nice and easy.

But it only delivered 30 to 32 N (SLS) thrust, maybe even 33 to 35 N depending on handheld scale inaccuracies the stand was checked with. It was not used any kind of augmentor or augmentation feature, but a "zero blow-by" 180°-bend.

There, of course, were gathred/gained a lot more information and experience data.
So as usual, mixed results.

One or the other picture may follow soon.

And due the engine needs a fix now anyway, I'm at least going to apply a 180°-bend to the engine geometry itself. Sooner or later.
Last edited by mk on Mon Sep 12, 2005 8:42 am, edited 1 time in total.
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Mark
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Re: re: 07 series comming along...

Post by Mark » Sun Sep 11, 2005 9:29 pm

mk wrote:Not yet.
I cannot complain about my neighbours, but I refuse to run engines more and more. They're just too loud.
One thing I think about is that a lot of pulsejets on eBay that command a high price are very small. Small pulsejets don't make as much noise, and yet they are quite impressive in their own right. If I were going to try to make money at selling pulsejets, the way to go would be to sell tiny engines. I have seen them sell for nearly as much as a full sized Dynajet only the materials and fabrication is far cheaper in my opinion. Mass produce very small pulsejets and you will start a large following. I feel certain of this, if you don't charge more than double the price they cost to produce. All you need is brains. May the best man win.
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re: 07 series comming along...

Post by Mark » Mon Sep 12, 2005 12:57 am

I can sympathize with the noise problem. Pulsejets are very unfriendly if you have neighbors. Once in awhile it's OK to make noise, but an avid tester is not going to be well received. Noise pollution is why I think smaller pulsejets are the way to go. While they are somewhat loud, they aren't earth shattering.
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re: 07 series comming along...

Post by mk » Mon Sep 12, 2005 11:27 pm

A couple of pictures.

Note the holes in the ground which weren't there before.
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site_09-09-2005_1.jpg
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site_09-09-2005_3.jpg
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re: 07 series comming along...

Post by Mark » Tue Sep 13, 2005 12:58 am

Looks good Marten. Is it loud? ha
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