Very Small Exhaust Hole

[racket]

If you need to ask if stainless can be welded , then you should cease your build NOW , you are not a suitable builder of a machine that will be a danger to you

[Bhuvan Aerospace]

Sir I was asking you because I dont have a electrical welding machine as I have mostly seen electrical weldings with stainless steel. I have acetylene welding machine. I am ready to take all dangers and risks to make this project successful as this will be the first microturbine powered rc plane in India. And sir, JestSpecs told that the flame tube length should be 12 cm. So, should I have 26 primary holes? And also Sir, after how much centimeters of gap should be there between primary and secondary holes , secondary holes and tertiary holes??

[racket]

Jetspecs would also have told you what thrust to expect :-(

A 20 mm inducer will flow maybe 6 lbs/min of air at the "usual" 12 lbs/min/square inch of inducer , 0.1 lbs/sec , the average thrust from our engines is ~50 lbs/lb/sec of airflow ~, which would equate to 5 lbs maximum thrust from 0.1 lb/sec of airflow,

BUT that 50 lbs/lb/sec is for much larger turbos which have higher component efficiencies , you would be very fortunate to produce 3 pounds of thrust.............I've done the thermodynamic cycle calculations, you will NOT produce any more thrust .

Have you considered how you will fuel this engine , propane would be the only choice , you have no idea of the complexity of making a working gas turbine at such very small scale , forget the idea .

This is my last email on this subject its a waste of time for both of us .

[Bhuvan Aerospace]

No sir, this the prototype Engine. It’s just for test because If one can succeeds in making the most complex engine , then he will be able to make the less complex engine easily. That’s why I am working on the complex. If it is successful, then I will make a 75 mm inducer Turbocharger Jet Engine.

[richardm]

I agree with racket last comment Start learning with the simplest things and slowly climb the ladder. By the way you ll never get a turbo charger based jet engine to fly in an RC plane. Can't you figure out why ?

[Bhuvan Aerospace]

I think it’s because The separation of every part like Combustion Chamber, External Pipes, and Weight is also a factor because separation of every part will increase weight. Separation of every part also causes more drag. It’s very complex to design a plane’s stability and balance as the parts are separated. Is that correct sir?

[richardm]

Simpler than that Your engine will be way to heavy for the thrust it will produce Its called thrust to weight ratio Just weight your turbo made in great part of thick heavy cast iron Will never work

[Bhuvan Aerospace]

Ya, thrust to weight ratio is very little. But I want to make a plane which will fly with a speed more than 500kmh with a turbocharger jet engine. I can buy any turbocharger to make this thing successful but I cannot make or buy small RC turbines.

[Bhuvan Aerospace]

Anyone please reply me

[Richard OConnell]

In my experience, there just isnt any reasonable way to convert a turbocharger to a thrust engine that would provide sufficient thrust for flight. Even if you were to do away with the cast casings, the advanced precision machining that it would take to construct proper guide vanes and the repetitious experimentation to make a viable thrust engine will be much more expensive than just buying a mainstream RC gas turbine. Some of these are available on popular RC forums used or for trade and if you have a decent turbocharger, that could be sold to pay for a good portion of one of those engines.

[Bhuvan Aerospace]

Where can I get a cheap R.C turbine engine?

[Richard OConnell]

Good deals occasionally show up over on RCgroups forum for used RC gas turbines www.rcgroups.com/fuel-rc-jets-fs-w-381/

[Bhuvan Aerospace]

Sir, is Jet Joe trusted (because it is a Chinese company and I don’t trust Chinese as I am an Indian.)?? Which one offers free shipping to India? Jet Joe or RC Groups?

[richardm]

How can't you figure this out by yourself? those website usually carry out all those informations.

[Bhuvan Aerospace]

I can’t identify which one is trusted. BTW, how long can a turbocharger jet engine run continuously without melting or exploding?