The humble beginnings of something BIG; JU-03!

[Johansson]

Mar 2, 2024 4:51:19 GMT -5 racket said:

Hi Anders

LOL.............can you bribe your daughter to have more friends over more often :-)

Rotor looking amazing ..............now thats BIG .

Cheers
John

I have passed the "difficult" diaper years with the kids so no one is missing me if I spend an hour or two in the workshop, it is mostly finding a balance between running, doing gun stuff and the workshop.

It is pretty big, the blades are stiff in the sense that I can´t bend them by hand so hopefully the wheel will hold its shape even when spun and heating up.

What do you think about blade profiling? With the size of the wheel a 3mm edge on the blades is perhaps not a big deal, on a tiny KJ-66 turbine the need for sharp edges is more evident.

[richardm]

Here's my humble opinion. Profiling the blades could help in extracting more energy from the passing gases. Im saying that on an intuitive basis, not calculations.
But since you already know that you won't be able to run that turbine to its full potential, is it worth the trouble? The only advantage ùi see is that it could run a little cooler for the same rpm/ torque etc. But is it worth it ?
Maybe someone with more experience and knowledge can prove me right or wrong.

[Johansson]

I didn´t get kicked out of the house today, but I fled to the workshop when the Swedish Eurovision auditions begun on the tv.

The star of tonights show was a mentally ill man dressed as a street prostitute, a new and world encompassing Carrington event would be a blessing at this point...



The gap is evened out around the compressor wheel as I told you yesterday, I also made a flange for the NGV.



I added some welds to the bearing housings as well, I will do it a little at a time to keep things from heating up too much.

A number of strenghtening vanes will be fitted between flanges and the shaft tunnel later, all weight is hanging from the bearing houses so they need some support.

Cheers!
/Anders

[Johansson]

It is a wet and rainy winter sunday today, a perfect day to get something done in the workshop.

I welded a bit more before breakfast and cleaned the compressor wheel for gluing, I searched the shelves yesterday and found a kilogram of Belzona industrial metal epoxy. Can´t get much better than that, funny that I forgot about those cans. Lots of dead fishes and acid warning labels on them so they must be good.

My plan is to get the shaft tunnel finished today with welds and strengthening fins, but we´ll see how it goes.

[Johansson]

The shaft tunnel is finished now, but I won´t paint it until the engine is finished since I would scratch the hell out of it during the flame tube construction.



The NGV flange is small in diameter so I can get the flame tube past it during assembly/disassembly.



When the metal epoxy had cured I painted the compressor wheel with red metal paint, a layer more is needed for acceptable coverage.



Cheers!
/Anders

[Johansson]

The compressor wheel is red enough and set to dry on the fridge lid.

[racket]

Hi Anders

Now thats a nice looking "leafblower" impellor ;-)

Cheers
John

[Johansson]

I don´t know why but red came to me as the natural compressor color. I ran out of paint before I could put a last layer inside the comp wheel but I figured who cares.

[racket]

Hi Anders

LOL..............I was talking to Andy this morning and he recons you painted it red so it won't show blood stains after it sucks in stray dogs and cats , better keep your chickens locked up :-)

Cheers
John

[Johansson]

HAHAHA! That was a good one! )

[Johansson]

The "Pet-Processor 2000" has dried and is installed on the shaft.

[richardm]

Really impressive!

[Johansson]

Thanks!

Once I have it sorted out and running I have a feeling that it will idle at really low rpms. A push with the hand sends it spinning for 10 seconds and the 500mm turbine wheel will produce lots of torque for turning the compressor.

Next up is the NGV, this evening I made a drawing for the parts needed and will try to get them laser cut at work. I have no thick stainless at home so I might as well save me the trouble of hand making a 300mm disc with bolt and cooling holes from a 5mm sheet.

[Johansson]

I sent the cad drawing to the laser guy last week, tomorrow I´ll be back at work so hopefully I have a shiny 5mm stainless NGV plate on my desk.

[andym]

Just got to finish off..... box up and send to you