Very Small Exhaust Hole

[Bhuvan Aerospace]

Ya sir, it is getting expensive. I think it will be better to build a 60mm inducer jet engine. The max weight of the airframe with engine will be 15 kgs. Do you agree with me? And another this sir, how can we make the compressor cover?

[racket]

You said you joined the GTBA , theres a build thread on there that might be worth looking at www.gtba.co.uk/gtba_forums/viewtopic.php?t=1270 , it uses the Jetmax 85mm turbine wheel , parts for which are available .

The compressor cover needs machining from solid billet or do a casting , as I do , then machine to final dimensions .

If you purchase the Kamps book I recommended it has all the info you need , ...........taken in conjunction with the vast amounts of technical info on the GTBA , you should be able to do the job .

Turbine engines MUST be built correctly otherwise they won't perform and can be easily destroyed if operated incorrectly ....................they are NOT toys !!!

[Bhuvan Aerospace]

Ya sir I understood. I will buy the book. Sir, we will break the record. Don’t worry.

[Bhuvan Aerospace]

Sir, I have to create another account in GTBA with another email. When I am going to create the account, it is telling permission forbidden.

[racket]

You'll need to communicate with the Moderator on GTBA , I'm a Member but know nothing about its workings .

[Bhuvan Aerospace]

Should I tell him on Facebook?

[racket]

I haven't the faintest idea, I don't use Facebook :-(

[Bhuvan Aerospace]

I also dont have facebook, but I will create one to register for GTBA. SIR, which engine you prefer to achieve 600 kmph speed? A 50mm inducer one or a 85 mm inducer one or a 100 mm inducer one or a 122 mm inducer one?

[enginewhisperer]

search youtube for RC jet plane speed records and look at what they are using.

Most RC jets are well under 600km/h, and the fastest is apparently 744km/h.

[racket]

As I mentioned in an earlier email , the power/thrust required will depend on the airframe and its drag , so I can't recommend any size inducer without having intimate knowledge of the airframe etc etc , and I have no interest in doing your research for you .

[Bhuvan Aerospace]

Sample design with 1 wing and no flaps or tail. What engine will you recommend for this design?

[racket]

LOL................I give up , don't you read my email replies ......................... what are the dimensions , weight , coefficient of drag etc etc etc ................do your own research .

[Bhuvan Aerospace]

ooh you talking about these things. Cd= 0.045, total weight= 30 kg, Length- 1.5 m, breadth- 1m (wingspan icluded) , height- 0.6 m + 0.2m for tail. All these ae expected.

[racket]

Total weight of 30Kgs ................mmmmm, thats a heavy "model" , 1500mm long .............this is sounding more like a military target drone .

A 1000mm wingspan doesn't give me much information on the actual frontal area of the entire "model" that you are trying to push through the air.

As for the Cd ...........that can only be an assumption until its tested .

Scaling off the "design" you posted , it would appear that maximum fuselage diameter is only ~150 mm which doesn't allow much room for a powerful engine or ancillaries if all engine air is entering through the front.

Lots more research required by YOU ................I'd suggest you "copy shamelessly" as everyone does , the aircraft in this video www.youtube.com/watch?v=1kLlWsHUWuo has an extremely small frontal area , the engine intake is "external" and producing minimal restriction/drag................plus the guy flying it would have to be very experienced not to crash it at the speeds its travelling at .

Checkout the Behotec turbines he uses www.tzimport.com/behotec-turbine.html

[Bhuvan Aerospace]

Is it enough to make 100 kg of thrust for achieving mach 0.9 with such a heavy plane?