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Post by Johansson on Nov 21, 2017 6:01:34 GMT -5
Nice! Are you planning go use somekind of guide vane? Or is that just overkill? Do you mean inlet guide vanes or vanes downstream the fan? In front of the fan I will add a large bellmouth, I haven´t really figured out how to make the transition between the fan and the afterburner yet. All I know is that we need some kind of sliding fit so no stress from the AB is transmitted to the fan cover. Most likely we´ll use a graphite rope to seal the sliding parts so it can take the heat soak after a run. |
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Post by Johansson on Nov 21, 2017 5:55:49 GMT -5
The sound of the turbofan at full reheat will be interesting for sure, since the fan is producing a very low pressure air flow there won´t be the normal afterburner scream but rather a loud rumbling. Add to that the whine from the turbofan and turbine plus the two gas producers running at 2+ bar P2 and the amount of noice coming from the ice yacht will be awesome.  |
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Post by Johansson on Nov 20, 2017 17:46:38 GMT -5
Hi Anders Saw your pics on Facebook :-) How are you going to "manage" the fan tip clearance , the taper is in the "wrong direction" for easy assembly , perhaps an abradable sleeve , the axial fan needs minimal clearances for good efficiency . Bummer about your pics :-( Cheers John Hi John, I guessed that some of you would have seen them already. I plan to fit the tapered insert from the rear and secure it to the stainless cover somehow, I am tempted to 3D print it from nylon since it then will be softer than the fan blades in case of a slight rub. Depends on how much heat that will be soaking in from the afterburner, but with the fan spinning for a while after an AB run I think everything will be very cold so a nylon insert should work. Cheers! /Anders |
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Post by Johansson on Nov 20, 2017 17:41:23 GMT -5
Ahh, now it is up and working again.  I welded the spokes to the hub and turned them down to the correct diameter in the lathe so they would fit inside the 200mm stainless fan cover.  There is still work to do on the part, smoothing out the air intake etc but now it is at least in place. The hub bore has a press fit to the shaft tunnel and I will secure it further with the TIG welder later.  The business end. A tapered insert will later be made and fitted around the fan to get the blade tolerances right.  Cheers! /Anders |
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Post by Johansson on Nov 20, 2017 17:29:11 GMT -5
I have the shroud in place now, unfortunately the damn Photobucket site seems to be down so I will post the pics as soon as it is working again. Knowing that Photobucket will end my 3rd party sharing account in a year or so is not exactly doing wonders to keeping build threads up to date, every picture I have posted on the internet for the last 10 years or so is through Photobucket so all will soon be lost. The same goes for the Mobacken Racing blog.  |
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Post by Johansson on Nov 20, 2017 17:23:29 GMT -5
That was news to me, sorry to hear it since they had lots of interesting stuff to read.
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Post by Johansson on Nov 17, 2017 15:57:40 GMT -5
Thanks! I hope to get some more work done this weekend, now it is rum time though. |
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Post by Johansson on Nov 16, 2017 4:54:44 GMT -5
Or add an impingement pipe in the turbine scroll and use scuba air as a boost starter?
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Post by Johansson on Nov 16, 2017 4:53:47 GMT -5
Is there any chance you can use the leaf blower to give the rotor some extra spin during startup?
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Post by Johansson on Nov 14, 2017 13:40:50 GMT -5
Today I have milled slots in the hub for the 7 spokes that will hold the fan cover.  I have cut out 7 spokes from ss2333 stainless that will be welded to the slots, they will be streamlined later to get rid of the sharp edges. Lots of air will pass them by so it is important to make the passages as smooth as possible.  Test fitting the part to the fan assembly.  The hub will also act as the turbofan mount, so I drilled and threaded 6 holes for M10 screws.  This is as far as I got today, now I need to do some thinking to figure out how to proceed from here.  Cheers! /Anders |
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Post by Johansson on Nov 14, 2017 0:19:42 GMT -5
Really cool Ian!
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Post by Johansson on Nov 14, 2017 0:12:20 GMT -5
Is it practical to drain oil from a turbo where the shaft is pointing in the vertical direction instead of the horizontal? I know this is not what you were referring to here, but it got me wondering. Thanks, Don Nope, same thing there. The bearing core is built so that the shaft needs to be somewhat horizontal and the drain port at the bottom (give or take 20° or so) if the oil is to evacuate the turbo, if not it will still work but the oil will pool up inside the housing and start leaking past the shaft seals. |
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Post by Johansson on Nov 11, 2017 16:53:25 GMT -5
This project has been sitting on my workbench for quite some time now, the bike and other hobbies have been taking up all of my spare time.  After a chat with Olov I got some inspiration to continue working on it so tonight I found a chunk of stainless in the shed that I turned down to a part that will eventually be a combined fan cover mount and fixing point for the turbofan in the ice yacht chassis. A set of stainless spokes will be welded to the hub later that will hold the fan cover.  Cheers! /Anders |
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Post by Johansson on Nov 10, 2017 16:00:43 GMT -5
When I wired the bike up originally I used a relay for each pump and had them switch activated, this made sense at the time but the downside is that there was a risk that I forgot to start the oil pumps before spinning the engine up on the starter. Not the end of the world since the fuel pump wouldn´t start without oil pressure but still. There was also the fact that I was riding around with a rat nest of wires and relays cable tied between the seat and the battery, an electrical failure waiting to happen if you ask me. Soooo, I figured that if I could get rid of all of the relays in the battery compartment I would tidy up the harness quite a bit. Now the oil pumps start when the main switch is activated and the fuel pump relay is placed next to the pump. During the last couple of evenings I have been working at it and for the first time in my life I have actually enjoyed wiring up electrical stuff. Must have struck some feng shui nerve.  I got a delivery notice today from the company I ordered the battery, it should arrive a week from now! Cheers! /Anders |
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Post by Johansson on Nov 10, 2017 9:26:57 GMT -5
I feel for you John, it is very frustrating when the engine is ready to go but the supply systems are messing up... |
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