JetManJoe Turbo Jet GoKart

[andym]

Its been said, we can do these engines how we want..... but I am still keen to follow KISS princible...

Electronics are wonderful, until they stop working track side, or you get RFI on the fuel system... etc. One return pipe from the fuel, no return from the afterburner, better to run it rich, keep temps down and not cause over heating..... so whats complex

All the guys i know that run big comercail engine cars, still use manual control

AS for losses, realy...... lol, how much i think, would be so small.... not to matter.... how good are the PWM, I have read as little as 85% so thats 15% loss...

Will say it again, we all do what we like....

[richardm]

Right about keeping it simple and do what we want. For my part Im retired and have been working all kind of project. Im not aiming at making the most powerful engine or anything like that.My fun comes from the making of something. Hence my taste for making almost everything myself. For example I have a Bendix ignition exciter hanging around but decided to build my own. Took a few months and attempts. Thanks to Andy for his videos about his igniters. That put me on the right track.
You see, one day that engine I m building might be running. I ll probably run it a few times and put it aside. My satisfaction will come from all the learning, experimenting, exploring trails and making those thing by myself.

I spent some 28 000 hours of my life flying thanks to some of this beautiful pieces of machinery Pt-6 ,RR Dart, P&W 100, CFM 56 ... I have spent so many hours in hangars looking at engineers working on em and explaining bits and pieces. I think that's where my taste for making something simple complicated comes from.. LOL. Complicated but within my limits....

I guess it all depends on individual goals and this forum is a great place to learn from others and trow in some ideas that might send someone on a different way of doing things.

On another note I've tried 3 different PWM on my pump motor and I can't get the motor running until the pot is almost half way up..Not happy with that. I've ordered an adjustable dc to dc step up voltage converter I'll give it a try and let you guys know if I can get a better response.

[andym]

Dec 27, 2023 9:16:58 GMT -5 richardm said:

Right about keeping it simple and do what we want. For my part Im retired and have been working all kind of project. Im not aiming at making the most powerful engine or anything like that.My fun comes from the making of something. Hence my taste for making almost everything myself. For example I have a Bendix ignition exciter hanging around but decided to build my own. Took a few months and attempts. Thanks to Andy for his videos about his igniters. That put me on the right track.
You see, one day that engine I m building might be running. I ll probably run it a few times and put it aside. My satisfaction will come from all the learning, experimenting, exploring trails and making those thing by myself.

I spent some 28 000 hours of my life flying thanks to some of this beautiful pieces of machinery Pt-6 ,RR Dart, P&W 100, CFM 56 ... I have spent so many hours in hangars looking at engineers working on em and explaining bits and pieces. I think that's where my taste for making something simple complicated comes from.. LOL. Complicated but within my limits....

I guess it all depends on individual goals and this forum is a great place to learn from others and trow in some ideas that might send someone on a different way of doing things.

On another note I've tried 3 different PWM on my pump motor and I can't get the motor running until the pot is almost half way up..Not happy with that. I've ordered an adjustable dc to dc step up voltage converter I'll give it a try and let you guys know if I can get a better response.

Have you tried a VESC controller, they will run a DC motor.... the ESC i had before cost £200 each, you coild control ram up/down.... end stop. start etc, will try and find link for them

[richardm]

Ok thanks ! Waiting for the link

[andym]

Sorry as you will see in the link , they are closed


kinseyelectronics.co.uk/

Most VESC will run a DC motor

check these

alienpowersystem.com/product-category/esc/ev-esc/

[slittlewing]

I would be hesitant about buying a vesc for a dc brushed motor. It will work an they have tonnes of features (CAN, PC control and logging, current limit, accel curve etc), but it’s a very expensive way of doing it. The vesc have 3 separate stages and outputs for the 3 phases of a BLDC motor, with sinusoidal control and microprocessing.
For simply speed controlling a brushed dc motor 95% of that tech is wasted, and it will only be able to do PWM at the end of the day. So for the fraction of the price you are back in the ballpark of a normal “ESC” for RC cars (much cheaper if you have a servo signal) or something like this:

uk.rs-online.com/web/p/motor-controllers/3305364

Of course, cheaper chinese copies of the vesc are available if wanted.

[andym]

Dec 27, 2023 14:14:03 GMT -5 slittlewing said:

I would be hesitant about buying a vesc for a dc brushed motor. It will work an they have tonnes of features (CAN, PC control and logging, current limit, accel curve etc), but it’s a very expensive way of doing it. The vesc have 3 separate stages and outputs for the 3 phases of a BLDC motor, with sinusoidal control and microprocessing.
For simply speed controlling a brushed dc motor 95% of that tech is wasted, and it will only be able to do PWM at the end of the day. So for the fraction of the price you are back in the ballpark of a normal “ESC” for RC cars (much cheaper if you have a servo signal) or something like this:

uk.rs-online.com/web/p/motor-controllers/3305364

Of course, cheaper chinese copies of the vesc are available if wanted.

Buy cheap, you buy twice.... the Vesc i have shared ,i have used, some, the company honour returs etc, not all chinese 

the Vesc as Scot said have plenty of control options, you can even write code to them, for custom functions, control them with 5v pressure trans 

Alien will ship internationaly.... if you see something you want, pm... see if he still gives me discount, to help you out 

Think for now as its getting away from topic, we perhaps start a thread, but there is plenty info on the site... 

[richardm]

Thanks for the link anyways Andy
Computer and me are like cats and dogs so let alone learning to program those Vesc And to top it all they dont seem to be compatible with Apple products with I use
But again thanks!

[andym]

You are welcome 

[andym]

Hi Joe

Just noticed you plan to use a hot steak for your afterburner, why ?
Have never used one, I dont think any one has in the uk.....

Use this design, JetRic's work.... we all kind of follow it over here.....





The afterburner on this video follows the design, with a little mod



but hay, we do what we want.....

[jetmanjoe]

Hi Andy, thanks for the drawing.
I think I came across this plan in the depths of the internet a while back and was going for that design.
Very good for easy mixing of the fuel / gases with the donut mixing.

Hows your spark plugs handle that heat? Do you have issues with them melting or cracking?

I liked the idea of no spark plug needed on the glowing white afterburner.
I had seen it used in another thread.

And this video too
youtu.be/DUoyPJzzCwI?si=OkLtSQzPamfLVbWb

[jetmanjoe]

I wanted to have the AB ignite 100% at all Turbo RPMs. Wanting them big afterburner boooooms
That's part of the reason I wanted to use Hot Streak. The faster the gas flow the higher the voltage needed to jump the air gap as you know.
In your video you do produce some lovely Booooms, the first one got your camera man by surprise

[jetmanjoe]

Arranging the layout of my test stand control panel.

[andym]

Dec 28, 2023 4:51:42 GMT -5 jetmanjoe said:

Hi Andy, thanks for the drawing.
I think I came across this plan in the depths of the internet a while back and was going for that design.
Very good for easy mixing of the fuel / gases with the donut mixing.

Hows your spark plugs handle that heat? Do you have issues with them melting or cracking?

I liked the idea of no spark plug needed on the glowing white afterburner.
I had seen it used in another thread.

And this video too
youtu.be/DUoyPJzzCwI?si=OkLtSQzPamfLVbWb

Not lost a spark plug ever.... dont think richard,tom or Scot have... you can still get pops and bangs... see video...... he lights the afterburner at full power



This one to,




but you may damage you turbine wheel ....

[richardm]

Just curious. How much gain do you get from the afterburner in terms of % thrust ?