www.pulse-jets.com

Check out my scratch built FD3/64 2:1 scale (!) turbojet engine, now up and running!
3.5 weeks of spare time and lost sleep focused in one direction and....viola

viewtopic.php?f=6&t=5578&start=0&st=0&sk=t&sd=a

9kg thrust would be nice.

I think it will be possible if a make a new turbine wheel of thicker SS sheet.
I would also have to beef upp the axel diameter to like 30- 40mm diameter to avoid
wreking it at full rpm.
Sorry, no TOT measurments yet.

Thank you! The bearings, Biltemas 8mm ceramic hybrid lager, is holding upp well so far. Testing has only just started. I do have a good feeling about it though, since they did survive the test runs when the turbine wheel were yellow-white....and the low rpm runs when they do not get any lubrication....

During my first test run, which i have not shown, the turbine wheel glowed bright yellow and would only self sustain for a minute or so before the wheel turned white and I had to turn the motor off. To my surprise that problem was completely cured with the second wheel, slightly longer blades3.5mm, ...

If you are a technical geek like me :wink: , you might want to listen to the film clip with head phones since you then clearly can hear when the engine is lit. There is a beautiful low pitch sound from the burning gas to be heard :D. Listening on the clip via the speaker in my lap top makes it impos...

Thanks! Check this out! The motor can self sustain and accelerate from 1800rpm! Obviously the throttle response is slow since the pressure is extremely low. It is hard to believe even when I se it with my own eyes, just amazing! The motor is really quiet at these rpm:s. http://www.youtube.com/watch?...

:D :D :D :D :D :D :D :D What do you know, -it works.... Just to clarify: IT WORKS!!!! :D :D :D :D :D :D :D :D Film clip on youtube: http://www.youtube.com/watch?v=EO_6E_QKmEU IMG_4048.JPG IMG_4034.JPG IMG_4049.JPG IMG_4050.JPG http://www.youtube.com/watch?v=EO_6E_QKmEU

There is plenty of room for air being sucked in all around the fan as well.

I guess the weld itself might make up for lost strength due to the hole.
Screcklings way to do it is actually not bad; it makes it easy to dissemble the motor.

If the startmotor works, its permanent....
Schreckling is very much against drilling holes in turbine discs because of the drastically decresed strength of the disc.
I will start experimenting using the 1mm material, if it does not work I will try thicker material.

Always check hobbycity.com if you are in need of RC stuff!

Uppdate:

Ha, ha, or maybe "Pettson" approach

D-day not to far away! I’m amazed how long this build has felt and how fast it, according to my calendar, actually have been executed. Yes, I am aware of that getting the motor to actually run can consume 5x the building time, if it can be persuade to run at all, that is… :? Well aware of forthcomin...

The first version of the shaft tunnel is coming along fine. It’s not at all difficult to weld aluminium as long as the argon gas keeps flowing. I always thought it was close to impossible to weld aluminium at home using a ordinary mig-mag machine..

Since I had a couple of mini sparkplugs laying in a box doing no good, I decided to mount one of them in the combustion camber. The size of this motor makes it easy to add such things... Right now I am working on the shaft tunnel. In this first attempt I will try to build it by welding several piece...

Thank you for your support guys! Regarding compressor rev, i just assume, and hope, that it will be able to take half of the original designs rpm:75000rpm/2. According to Shreckling it is the inner part, "the leading edge" of the compressor blades that will fail first, so adding more carbon fibre ar...