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Post by jetjeff on Jun 17, 2016 2:05:29 GMT -5
Hi All, Pics of balancing the compressor, burner can progress and engine mounts, I'll pop rivet to the mini keg. Jeff
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jun 17, 2016 5:32:50 GMT -5
Hi Jeff,
looking good! How do you balance the compressor? Do you remove some carbon from the heavy side or add some to the light side?
Adam
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Post by jetjeff on Jun 17, 2016 8:09:48 GMT -5
Hi Adam, Thanks. Good question, I know the heavy spot but I'm hesitant to grind into the disk after spending several weeks making it. May just add some epoxy on the opposite side. Jeff
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Post by jetjeff on Jun 21, 2016 2:13:04 GMT -5
Hi All,
All of the pics I've seen on the web for Schreckling engines that use U shaped evaporators show the tube exit in a clockwise direction (as viewed from the front of the burner can). That doesn't make sense to me, seems like you'd want it in a counterclockwise direction (the same direction the rotor spins as viewed from the front). Any thoughts?
Jeff
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Post by jetjeff on Jun 27, 2016 4:07:18 GMT -5
Hi All, I had the inner and outer liner tack welded. The pic shows the NGV, inner liner, shaft tunnel and compressor diffusor. Just checking the fit. Jeff
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Post by jetjeff on Jul 1, 2016 0:16:29 GMT -5
Hi All, I cut the cooling flaps in the outer burner can liner. The plans don't say how far to bend the flaps in,,,I just kind of eyeballed it to the pictures. Jeff
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Post by racket on Jul 1, 2016 20:08:05 GMT -5
Hi Jeff
The "rectangular" flow area at the end of the flap would be taken as a percentage part of the total wall hole area , I'd be careful about having it too large an area
Cheers John
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Post by jetjeff on Jul 2, 2016 0:29:31 GMT -5
Hi John,
Thanks. I mispoke in regards to the flaps, I believe they supply air to the secondary burn zone. The cooling air are the slots Kurt cut at the very end of the burner can.
Hope your back is better, I've tweaked mine twice and know how painful that can be.
Jeff
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Post by jetjeff on Jul 2, 2016 5:13:34 GMT -5
Hi All, I liked the idea the one member suggested to improve airflow through the vaporizers, by flush mounting them to the burner can, so I machined a brass alignment dowel to weld them to the inside of the front ring of the burner can. Jeff
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Post by jetjeff on Jul 2, 2016 11:59:02 GMT -5
Hi All, I just got back from the welders, here is the finished burner can. I deviated from the plans slightly for the cooling holes, I made small V's instead of rectangles Jeff
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jul 3, 2016 15:49:03 GMT -5
Hi Jeff,
It's looking really good, you must be almost finished?
Adam
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Post by jetjeff on Jul 4, 2016 1:28:26 GMT -5
Hi Adam,
Thanks. Pretty close, though the main components are complete, I still have to balance the rotor, make the fuel manifold, oil line, and test assembly for fit. But, there is light at the end of the tunnel, or hopefully not light, but no more than a dull red ring at the turbine end,,,lol.
Have you made any progress on your build?
Jeff
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jul 6, 2016 5:21:31 GMT -5
Hi Jeff,
Sorry for the late reply. I won an old lathe on the local auction site on Sunday and got a bit side tracked, I've been taking it apart and cleaning it (a bit like a kid with a new Christmas present). I was getting fed up with my mini lathe jamming or pushing the tool away when trying to turn things over about 80-100mm. I made up a pattern for casting the diffuser, got the furnace all ready and tried molding it in the sand on Sunday, but (as I suspected) I wasn't able to remove the pattern from the sand without bringing some of the sand between the vanes with it. So i'm thinking of making a rubber mold from the pattern so I can make it from wax and do it as a lost wax investment casting. Or when I get this more robust late sorted, I could just cast some simple disks, one for diffuser, one for cover, and a cylinder for the compressor cover, and make the diffuser with the flat sheet vanes like yours. Smithy sent a 66mm turbine wheel to me last week, so I will wait for that to arrive before I do anymore to the NGV.
Adam
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Post by Johansson on Jul 6, 2016 13:43:39 GMT -5
Hi Jeff, Sorry for the late reply. I won an old lathe on the local auction site on Sunday and got a bit side tracked, I've been taking it apart and cleaning it (a bit like a kid with a new Christmas present). I was getting fed up with my mini lathe jamming or pushing the tool away when trying to turn things over about 80-100mm. I made up a pattern for casting the diffuser, got the furnace all ready and tried molding it in the sand on Sunday, but (as I suspected) I wasn't able to remove the pattern from the sand without bringing some of the sand between the vanes with it. So i'm thinking of making a rubber mold from the pattern so I can make it from wax and do it as a lost wax investment casting. Or when I get this more robust late sorted, I could just cast some simple disks, one for diffuser, one for cover, and a cylinder for the compressor cover, and make the diffuser with the flat sheet vanes like yours. Smithy sent a 66mm turbine wheel to me last week, so I will wait for that to arrive before I do anymore to the NGV. Adam When I get my 3D printer working again I can print a pattern for you in PLA plastic and mail it to you, unfortunately the printer company helpdesk is on vacation so I don´t know when I will get help. For you computer guys it is the Beagleboard Black that I can´t figure out how to boot with new software from a micro SD card, probably dead simple for anyone less stupid with computers than I...
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Post by jetjeff on Jul 6, 2016 17:04:30 GMT -5
Hi All,
Adam, that's great you got a better lathe. You definitely need a decent lathe to build turbines. Wow, worldwide support with the common goal of building turbines, it doesn't get any better than that.
Jeff
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