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Post by racket on Jan 17, 2024 2:14:40 GMT -5
Hi Anders
Some closer tolerance at the inducer , maybe once the wheel is made you can mount it in the bearings and "turn" a laby seal arrangement between it and the outer casing , I think you'll find an answer once its mounted up :-)
Cheers
John
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Post by Johansson on Jan 17, 2024 16:28:17 GMT -5
Yup, I´ll cross that bridge when I get there.  |
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Post by Johansson on Jan 19, 2024 16:10:33 GMT -5
A quick visit to the workshop, I had to modify the jaws on the spot welder for them to fit inside the compressor wheel.  With that done I just had to try to weld a couple of blades, I checked every blade with a precision 90 degree angle before welding.  With four blades welded I see no signs of warping, I will add two more welds in between the ones I´ve done so far for extra strength. I will most likely soil my breeches if the compressor disintegrates at 10.000rpm...  Cheers! /Anders |
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Post by Johansson on Jan 20, 2024 12:27:21 GMT -5
I continued spot welding the blades today.  No warping whatsoever, but the 2.5+1.5mm thickness is stretching it with this welder.  I added tig welds to the edges of the blades for some extra strength.  The same on the exducer side.  Finally I could assemble the compressor wheel and see how it fits on the shaft!  I gave it a spin and it runs pretty true, the lid has a slight bulge on one side that I will try to hammer out, but the bottom plate has no wobble.  Even with the hand spin it pumped quite a bit of air, no cats or untethered children close to the intake on this engine!  Cheers! /Anders |
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Post by andym on Jan 20, 2024 12:50:45 GMT -5
WoW..... epic, nice work
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Post by Johansson on Jan 20, 2024 14:26:25 GMT -5
Thanks Andy, I hope the welding will do. I am thinking about getting some metal glue and seal the gaps along the blades, with a little heat on the metal the glue should creep in pretty well in the cracks.
I have no idea what kind of force there will be trying to push the compressor apart at 10.000rpm, better safe than sorry I guess.
Hopefully I will have the turbine blades made during next week.
Despite my earlier rant I will have them laser cut, when I have a final version of them made I can make a set by hand "just because I can" but not during the R&D when I will try different thicknesses and angles. It is simply too boring to make dozens of blade segments by hand...
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monty
Senior Member
Currently being spanked by mother nature.......
Joined: September 2018
Posts: 400
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Post by monty on Jan 20, 2024 14:29:15 GMT -5
I just have one question...... Will there be an ice sled?
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Post by Johansson on Jan 20, 2024 14:38:51 GMT -5
I knew that one would come. I can say this much. Once this engine is running like a champ and producing the calculated thrust, I don´t think I will just let it sit and collect dust. With the afterburning turbofan iceyacht hopefully operational within a 10-year span, we will hopefully have a fun enough ice racing vehicle. If that engine fails to work this might be a good backup. |
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Post by Johansson on Jan 21, 2024 2:43:35 GMT -5
I am making a test with a glue I fancy, the Loctite Repair Extreme. I added a string along the edge of the welded-on pieces, nothing in between the parts. Once it has set I will try to pull the scrap pieces apart and see how well it holds up, if it does the trick I will add a string of it along the blade seams in the compressor.  Before I do any work on the hot end of the motor I will finish the diffuser side, so more hacksawing and welding aluminum ahead! /Anders |
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Post by Johansson on Jan 22, 2024 14:58:01 GMT -5
The glue idea didn´t stick. (Did I just make a joke? I am not sure, I get most of my english from technical manuals and Grimdark fantasy novels) The parts broke apart easy, I probably have to get the glue in between the parts for it to work. I´ll add a few more welds to the blades and leave it at that. To end the day on a good note I made the rim around the diffuser edge, it is 30mm deep and will get straightening vanes welded to it later.  I´ll finish welding it later, the torch get darn hot since it is only air cooled.  The fuel nozzle manifold will be bolted to the backside of the diffuser and have its feed line passing through the rim just behind one of the straightening vanes. One thing that I am really really happy about is that the 10.000rpm max revs is low enough to run the fuel pump directly from the rotor via a tooth belt. I will only need a battery and IC-motor for starting, after that it is running 100% on its own. Yayy! /Anders |
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richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Jan 22, 2024 15:59:07 GMT -5
Nice work. Are you planning to balance the finished wheel. At 10 K rpm and this size it won't take much imbalance to vibrate a lot
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Post by Johansson on Jan 22, 2024 16:06:21 GMT -5
Nice work. Are you planning to balance the finished wheel. At 10 K rpm and this size it won't take much imbalance to vibrate a lot Yes I will make a static balancing rig for both the compressor and turbine wheel, I don´t think there is any turbo repair shop that can fit these wheels in their balancing rigs so I have to do it myself. |
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richardm
Senior Member
Joined: June 2022
Posts: 413
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Post by richardm on Jan 22, 2024 18:43:10 GMT -5
Indeed too big for a turbo shop to balance Wondering if a mechanic could try to fit this wheel on car tire balancing machine.. Probably not just wondering Maybe worth asking...
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Post by Johansson on Jan 23, 2024 13:10:26 GMT -5
Indeed too big for a turbo shop to balance Wondering if a mechanic could try to fit this wheel on car tire balancing machine.. Probably not just wondering Maybe worth asking... My neighbor has a modern wheel balancing machine, we discussed it earlier if it is accurate enough. Might have to give it a try when the rotor is finished. |
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Post by wannabebuilderuk on Jan 23, 2024 15:41:28 GMT -5
Indeed too big for a turbo shop to balance Wondering if a mechanic could try to fit this wheel on car tire balancing machine.. Probably not just wondering Maybe worth asking... My neighbor has a modern wheel balancing machine, we discussed it earlier if it is accurate enough. Might have to give it a try when the rotor is finished. I'm picturing you hiding behind a plywood sheet as the sound increases and the wheel balancer begins to hover 😂 |
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