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Post by enginewhisperer on Aug 18, 2014 0:47:47 GMT -5
good luck! keep us posted - I'll try to come and have a look / lend a hand when you run it
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Post by enginewhisperer on Jul 27, 2014 17:52:18 GMT -5
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Post by enginewhisperer on Jul 26, 2014 8:40:47 GMT -5
good luck!
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Post by enginewhisperer on Jul 2, 2014 19:56:14 GMT -5
awesome
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Post by enginewhisperer on Jun 27, 2014 2:05:04 GMT -5
CPS will be Cycles Per Second - so yep, Hertz
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Post by enginewhisperer on May 25, 2014 4:40:56 GMT -5
I'd just run it like that You could even make some small plates that protrude into the turbine housing and smooth off the corners - but that's probably overkill.
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Post by enginewhisperer on May 24, 2014 17:46:43 GMT -5
I think 500 might be the decibels
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Post by enginewhisperer on May 23, 2014 18:56:53 GMT -5
Not much progress here yet! I've been flat out rebuilding my car, and have been overseas a bit for work, but still processing this in the background Yesterday I found a very solid cast iron, belt driven blower fan assembly at the scrap metal shop so I grabbed it. Essentially it's a big scroll housing with a ~100mm inlet and ~130mm outlet, with a nice fat shaft and bearing setup which is all easily dismantled and modified. The blower fan is around 200mm diameter, and should work as a low efficiency, low rpm turbine - but I can also easily replace it with something custom made. In other news, my mill is up and running (it was rescued from scrap, missing a few parts), so I should be able to make some more jet progress soon!
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Post by enginewhisperer on May 23, 2014 18:52:02 GMT -5
to be fair, a contained mushroom cloud is pretty much what happens when gas flows through a stepped pipe
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Racket
Apr 27, 2014 2:04:31 GMT -5
Post by enginewhisperer on Apr 27, 2014 2:04:31 GMT -5
fingers crossed for getting better soon!
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Post by enginewhisperer on Apr 14, 2014 10:14:55 GMT -5
excellent project!
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Post by enginewhisperer on Apr 1, 2014 7:18:00 GMT -5
you won't get much pressure with a normal propeller, but you could adapt a centrifugal compressor to an R/C engine, which should give you a better result. It's still very limited compared to a turbine engine, but would be an interesting experiment
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Post by enginewhisperer on Mar 26, 2014 21:45:05 GMT -5
one interesting thing you can just see in the cutaway pic though is the solenoid to control the NGVs in the turbine housing. It actually uses a hydraulic actuator to move them, powered by the lubrication oil feed and controlled by the solenoid.
I guess it provides much higher force capability than the old vacuum actuators they used to use (where the vanes could seize up and overboost the engine)
There's also a wastegate on that turbo, so I guess they have gone for extreme low rpm response - undersized turbine, low inertia compressor, variable vanes, etc
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Post by enginewhisperer on Mar 26, 2014 21:38:37 GMT -5
no flow control hardware that I could see in the turbo, although they could have done something external in the pipe work.
Since the compressors both outlet into the same space they couldn't do much with it though I think, so as far as I can tell, it's really just a way of getting more flow from a smaller diameter turbine, which will have lower inertia than a larger diameter single sided one.
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Post by enginewhisperer on Mar 25, 2014 19:49:02 GMT -5
I had a look at one of these in person the other week. It's a pretty interesting solution for lower inertia, but there's a worrying amount of shaft overhang from the front bearing!
When I first heard about it I thought they were doing a two stage compressor - but it's just two parallel compressors in one housing both exiting into a single scroll.
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