ripp
Veteran Member
I'm sorry, I don't speak english, so I torment you (and myself) with a translation program,Sorry
Joined: January 2013
Posts: 237
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Post by ripp on Sept 13, 2013 2:24:52 GMT -5
Hi Anders,
I come from Austria and gas turbines always interested me.
1995 I saw the first time a working Turbine designed from Kurt Schrecking (FD-64).
1996 I reproduced this model and 1997 the KJ-66 with 8 kg thrust.
Since that time I'm always interested in small turbines.
I would indeed like to comment your great projects in detail, unfortunately the translation program is very complicated and time-consuming.
But with great interest I will continue to follow your project.
rip
google translation
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cursorkeys
Veteran Member
Proper engines use the Brayton cycle
Joined: July 2012
Posts: 108
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Post by cursorkeys on Sept 13, 2013 7:10:59 GMT -5
Just a quick question, the Nimbus engine uses the central bearing shaft as the fuel supply spray. So centrifugal force is used to help disperse the fuel and fuel is used to help cool the shaft. Could a system like this be used on one these type of engines? Is there any benefit/disadvantage to a system like this? Ian... Hi Ian, I think size is our biggest enemy, with our small engines and narrow turbine shafts there won´t be much centrifugal force to build fuel pressure before the spray nozzles. Another thing is the journal bearings, to get fuel into the shaft you would need a swivel of some sort and for that to work I think the shaft needs to be secured by ball bearings so it doesn´t move radially. You would still need a throttle arrangement and a fuel pump to meter the fuel going into the shaft, so it would only add unneeded complexity to a DIY engine. I know a Williams jet engine used for drones and cruse missiles used this system, but I guess that is mostly to save weight and cost since the engine is disposable. Cheers! /Anders Hi Anders, Just as a point of interest the Williams WR27-1 airbourne APU also used centrifugal fuel nozzles. I've never been able to satisfactorily find out how similar the WR-24 drone turbojet and the WR-27 APU are so they may just share the same core. Or, as you said, that design choice might be just for weight-saving. Cheers, Jon |
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Post by turbochris on Sept 13, 2013 9:30:01 GMT -5
don't forget you have to leave out the shaft tunnel if you use the main shaft for fuel distribution. This means a rigid outer casing.
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Post by Johansson on Sept 14, 2013 0:00:01 GMT -5
Hi Rip, It is too bad that we don´t share a common language, I know some basic german but that´s about it. =( I don´t suppose there are any english speaking Austrians here who could translate for you? A couple of days ago I found some workshop time and finished the shaft tunnel modifications.  Next up is to make the piece with all the oil channels drilled in it, hopefully I can do it in a couple of days. Fixing the last house projects before snow falls have higher priority right now...   The drive chain has also arrived.  A quick test fit confirmed what I already knew, the rear gearbox mount needs to me modified for chain clearance. A test drive this fall feels far away right now...  This isn´t even the largest front sprocket so I´ll have to remove a fair bit of material, perhaps even add a nylon strip in case the chain still can get close to the mount.  The new ignition has also arrived, even at 3V it packs a mighty punch. Cheers! /Anders |
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Post by racket on Sept 14, 2013 0:32:03 GMT -5
Hi Anders
Thats a bummer about the chain clearance :-(
When I made the 2 shaft kart I was limited in my axle sprocket size because the chain hit the frame , at least you can modify the mount, is there a chance of moving the chain further out by packing under the rear sprocket , or is the chain already fairly close to the rear subframe .
Cheers
John
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Post by Johansson on Sept 14, 2013 0:54:24 GMT -5
Hi John,
No problems, I have all winter to fix it. =)
Cheers!
/Anders
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Post by racket on Sept 14, 2013 1:07:13 GMT -5
Hi Anders
LOL........and a very long one at that :-)
Just another of those "little" jobs that crop up when building a "one off" bike .
She'll be lookin' good by Spring :-)
Cheers
John
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Post by Johansson on Sept 14, 2013 15:40:37 GMT -5
Hi John,
Indeed, the roads won´t be drivable until late April so I have plenty of time. Especially when all outdoor house repairs are naturally put on hold during the winter. =)
She´ll be a fine looking lady by then I hope.
Cheers!
/Anders
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Post by turbochris on Sept 14, 2013 19:34:50 GMT -5
just take a saw to the mount. sure, it will look like hell but it will take 10 minutes and you can mill it nice next time you have it apart
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gidge348
Senior Member
Joined: September 2010
Posts: 426 
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Post by gidge348 on Sept 14, 2013 22:46:03 GMT -5
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Post by Johansson on Sept 15, 2013 5:58:18 GMT -5
That is a great idea Ian! I´ll take a closer look and figure something out. Thanks!
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tegwin
Member
Joined: February 2012
Posts: 19
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Post by tegwin on Sept 15, 2013 7:04:21 GMT -5
Anders that ignition module looks really smart. What is it from? I could do with one of those for my engine  |
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Post by Johansson on Sept 15, 2013 9:58:17 GMT -5
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Sept 15, 2013 13:31:06 GMT -5
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Sept 15, 2013 22:13:53 GMT -5
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