Feathers
Veteran Member
Joined: August 2010
Posts: 169
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Post by Feathers on Sept 24, 2014 0:50:03 GMT -5
Hey guys, its Austin Feathers here
I've built a couple engines, the latest based on an ST-50 turbo, and discovered the Physics and Engineering Student Organization (PESO) during my time at the University of Kansas.
After two years, I'm now vice president under a fellow JATO user PulsedPropulsion (Thomas) who is sure to comment on this thread shortly with some sort of introduction.
We're now off to build a kart reminiscent of Mr. Racket's twin-shaft turbine kart, using an ST-50 based gas generator and (we're thinking) a radial power turbine based on a turbocharger turbine wheel.
Ordered two ST-50 turbos, to make sure we have at least one set of good parts! Picking up a racing kart chassis tomorrow afternoon, and the madness will ensue shortly thereafter.
Any questions, comments, concerns, or valuable advice welcome!
This thread will now fill with pretty pictures of racing karts, turbochargers, and lots of 304 stainless.
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Post by racket on Sept 24, 2014 2:05:22 GMT -5
Hi Feathers
Good to see you back :-)
Looking forward to the build ...............I love shiny 304 stainless
Cheers
John
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Feathers
Veteran Member
Joined: August 2010
Posts: 169
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Post by Feathers on Sept 24, 2014 22:10:14 GMT -5
The Turbine Test Vehicle has arrived.  |
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Post by racket on Sept 25, 2014 4:51:14 GMT -5
Hi Feather
LOL..............first job , remove IC engine, and sell to finance turbine build ;-)
Cheers
John
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Post by pulsedpropulsion on Sept 25, 2014 20:32:00 GMT -5
Hello!
I am rather new to this forum, as you can tell, so I guess this is my introduction! My name is Thomas Row and I'm studying Aerospace engineering at the University of Kansas. I've been doing rockets for a long time, but for years I've wanted to do jet engines. I have recently built a very large pulsejet named Mater with Mr. Feathers! As he has already said, our club PESO is building a Turboshaft Kart. We will probably need all the help we can get from you gents, so any and all help is welcomed!
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Post by racket on Sept 25, 2014 22:18:42 GMT -5
Hi Thomas Welcome to the world of gas turbines We're here to help smooth the path to jet karting success :-) Its probably worthwhile having a look through the various builds in this Section of the Board , theres a build thread of my 2 shaft kart..... jetandturbineowners.proboards.com/thread/40/2-shaft-turbine-kart-build. Once you have the gas producer running and data logged we can get into working out a suitable freepower stage design . Cheers John |
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Post by pulsedpropulsion on Sept 27, 2014 2:28:18 GMT -5
 One of our biggest questions is, when machining a part like this, how do you match the curved profile from inducer to exducer on the power turbine? We have access to several well-equipped machine shops, but no CNC equipment (no CNC lathes). |
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Post by Johansson on Sept 27, 2014 3:48:46 GMT -5
Some eye measure and a bit of trial and error is all that is needed.  |
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Post by racket on Sept 27, 2014 4:02:01 GMT -5
Hi Thomas
You can grind a tool to the correct profile, or just start cutting and keep fitting up the turb wheel to the piece in the chuck and check where bits need removing , it can be a time consuming process getting the profile correct with the desired clearances.
The first step is to bore the piece to the exducer diameter plus clearance , then go from there.
Can I ask why you're concerned about the freepower at this early stage of development , its advisable to get the gas producer working and sorted first , then measure the energy (temperature and total pressure) in the exhaust from the gas producer when fitted with a suitably sized jet nozzle to optimise that jet pipe energy.
Once you know the mass flow , temperature and pressure thats available , the power turbine stage can be designed, taking into account the type of transmission ( gears or chain) to be used along with the projected/desired maximum rpm of the freepower turbine.
If you are going to use a ST50 for the gas producer you'll be needing quite a large freepower wheel , generally around twice the flow space as the gas producer turbine wheel .
Get the gas producer going and then we'll complicate things by talking about power turbines , far too early to be worrying about it :-)
Cheers
John
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Post by pulsedpropulsion on Sept 27, 2014 18:45:37 GMT -5
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Post by racket on Sept 27, 2014 19:25:40 GMT -5
Hi Thomas
Now that looks better :-)
What colour do you intend painting it ??
Cheers
John
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Post by pulsedpropulsion on Sept 27, 2014 19:30:56 GMT -5
The color has yet to be decided, but I'm leaning towards black frame with a red steering wheel. We're open to ideas, though!
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Post by racket on Sept 27, 2014 20:06:42 GMT -5
Hi Thomas
Black and Gold always looks good , they then go with any other trim colours :-)
Cheers
John
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Post by pulsedpropulsion on Sept 27, 2014 20:29:00 GMT -5
Can't do black and gold!! Sorry, that's our rival school's colors. That wouldn't go over well.. Pretty much anything besides gold is alright, though!
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Post by racket on Sept 27, 2014 20:33:28 GMT -5
OOOPS :-(
Forget gold .
Black frame then , with shiny stainless bits for the turbine .
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