Hello Valve for pj 90

Maxime Chamberland · Post by **Maxime Chamberland** » Sun Jan 21, 2007 6:55 am

someone know what is the thikness of the valve used in the pj90 from team helmond?

hans litjens · Post by **hans litjens** » Fri Jan 26, 2007 12:29 pm

hey i believe they used 0.020 but when you make them 0.025 they will survive longer with 0.020 you can fly 2 or 3 time's and with 0.025 you can fly many times more. We are making a copy of the pulsejet of bert van didden :D . he said the 0.025 was the best. Bert quadvlieg also said. but i don't know what you gonne do with the pulsejet will you fly with it and how many kg thrust you want to have.

Mark · Post by **Mark** » Fri Jan 26, 2007 10:14 pm

http://mdmetric.com/tech/cvtcht.htm

Dj Nafets · Post by **Dj Nafets** » Sat Mar 17, 2007 11:24 am

Hello, this is my first post on this board.

As you can see on my website, I built many pulsejets wich have similar dimensions to the P90 of the Helmond-Team.

The most reliable and powerful combination is as 0,25mm ( 0.098" ) main valve and a 0,25mm ( 0.098" ) second valve.

They are made of cold formed 1.4301 sheets ( I think it is similar to 316 )

Post by **Mike Everman** » Sat Mar 17, 2007 2:19 pm

Welcome, Dj
Everyone should check out your site! You've got some great projects there!

Mark · Post by **Mark** » Sat Mar 17, 2007 7:14 pm

www.pulsorohr.de
Looks like a one man factory there Dj. What kind of metal do you use for the body of your pulsejets, is it an inconel or something like a 321 stainless steel? It kind of takes the wind out of my sails seeing such detailed workmanship. But I guess there are plenty of ideas to go around, still lots of things to dwell upon. I enjoyed looking at all your images very much, although I couldn't read along.
Mark

Dj Nafets · Post by **Dj Nafets** » Sun Mar 18, 2007 8:33 pm

The XP90 engine ist made of 1.4301 ( 316 ) with a thickness of 0,5mm. In my opinion using inconel isnÂ´t very usefull. With the money to by inconel for one engine you can build many pulsejets out of stainless steel.

At the moment IÂ´m building a spotwelder to weld the valves on the valvecarrier of the Argus engine. I will update my page soon.

marksteamnz · Post by **marksteamnz** » Mon Mar 19, 2007 4:47 am

Wow Dj that is incredable. Can you or anyone who can read the web site confirm that the valve plates are being cast into a metal mould please. Its the Gussformen und Giessen page.
Very impressive especially that nice high speed spindle on the CNC mill.

Dj Nafets · Post by **Dj Nafets** » Mon Mar 19, 2007 5:55 am

The valveplates are casted and consists of an aluminium alloy.

Thats the most simple way to get them.

mk · Post by mk » Mon Mar 19, 2007 3:22 pm

Hallo! (!

Definitely a nice webpage with some cool projects on it, and -- so far -- good engineering know-how!

marksteamnz · Post by **marksteamnz** » Mon Mar 26, 2007 8:48 pm

Dj Nafets wrote:The valveplates are casted and consists of an aluminium alloy.

Thats the most simple way to get them.

I was wondering what material the mold / die (Gussform)? is made from.

Dj Nafets · Post by **Dj Nafets** » Tue Mar 27, 2007 4:46 am

The mold is made of grey cast iron.

This material is very easy to process.

marksteamnz · Post by **marksteamnz** » Tue Mar 27, 2007 8:50 am

Thanks for that
I've been told on another forum hobby casting allumium into metal moulds was to complicated to work. I thought that was wrong and your wonderful work has proved it was wrong.
Thankyou for sharing your knowledge it is much appreciated.

Dj Nafets · Post by **Dj Nafets** » Tue Mar 27, 2007 11:34 am

But I have to say that the casting is done in the foundry of my father. So IÂ´m able to build molds and do casting with professionel knwoledge and equipment.

I think that this work is impossible with backyard methods as well.

www.pulse-jets.com