Very Small Exhaust Hole

[Bhuvan Aerospace]

I am building my own TurboJet Engine from a Turbocharger. Actually, I have a doubt about the thrust. My Turbocharger has very small hole of Exhaust (3cm) unlike the large exhaust holes of the large turbochargers which generates a lot of thrust so I am worried about the thrust. How much thrust will it generate from such a small exhaust hole? Its intake is also very small. Will it generate a good amount of Thrust? I have already spent a huge amount of money. Please help!!

[racket]

It'll produce virtually no thrust , very small turbos have poor component efficiencies , if you can produce even a couple of pounds thrust you're doing well

[Bhuvan Aerospace]

But I have very less budget and I have to fly an RC plane with that.
Please help me.

[racket]

Hi

How big is the inlet diameter of the compressor wheel ??.

If your turbo is similar to the Garrett GT1241 with a 29mm comp inducer then your max flow will be very small, ~10 lbs/min , the very small jet joe engine www.jetjoe.com/cp_detail.html?pd=pd1 only produces 3.5 lbs of thrust, and its a professionally made engine .

As I said in my earlier email , if you can get a couple of pounds thrust you're doing well .

Cheers
John

[Bhuvan Aerospace]

It has 4.5 Cm diameter inducer compressor. I have used Tin for making flame tube and combustion chamber. Is using Tin okay? And will it produce a good amount of thrust?

[racket]

Hi

A 45mm dia inducer CAN"T be used with a 30mm turbine exducer , the compressor will be in surge at all times , the "hole in" needs to be smaller than the "hole out" of the engine.

It won't produce any thrust :-(

Cheers
John

[Bhuvan Aerospace]

My turbocharger is very similar to these turbochargers- youtu.be/NR5vczw5jZ0?si=jC5nnLpXL-Gcm2lB

and also - youtu.be/bcd3vg-5hDA?si=92N1PhM_LSVHJh6m

[Bhuvan Aerospace]

my turbocharger exhaust hole is like this - img.th-group.eu/images01366/BWT5435-988-0006_2.JPG

[racket]

Hi

I think you might be mixing up your inducer and exducer sizes , the comp wheel inducer is smaller than the comp wheel exducer .................the turb wheel inducer is bigger than the turb wheel exducer .

What are the dimensions of your wheels ??

Cheers
John

[Bhuvan Aerospace]

As I have my turbo in the workshop, I cant measure the dimensions. I think the inducer and the exducer dimensions are same. I will confirm you when I receive the turbo. But will it produce 20lb thrust if the inducer and the exducer dimensions are same?

[racket]

20 lbs of thrust is a fair amount and will require more mass flow than what your dimensions indicate .

I need a lot more information on the turbo , Make , Model etc etc

[Bhuvan Aerospace]

I will tell you the exact dimensions within tomorrow. But I have to fly a 20 kg plane with this engine. Is that possible?

[racket]

I strongly doubt it

[Bhuvan Aerospace]

me too because my plane has to reach minimum 500kmh

[racket]

thats going to need a lot of thrust