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Post by Johansson on Oct 21, 2013 13:57:44 GMT -5
Hi Anders No turbine failures this time , you've both had your fair share of those , time for success :-) "The more engines you make the easier it gets" , heh heh , thats what suppose to happen , I think they just get more refined , not easier , we start to realise all the potential problems that can eventuate and have to try and prevent them by doing the job a bit better than previously............progressive development . Cheers John Good to hear that you have faith in us John. It almost feels like cheating to use a standard turbocharger after going through all the trouble with the DIY engine core in the JU-01. No need to ream out the shaft tunnel? Whaaaaat??! *LOL* After this year add another turbine, and add one each year! clusterfuck! Hell yeah! Quad turbo kick sled, 800 lbs of awesomeness! Anders, in the 2nd picture, you're holding the flametube. It looks like the top has been cut and re-welded. Is this so you can get the round-to-square shape or is there something else welded inside (can't quite see) If there isn't, you can make a flat pattern layout that will allow you to roll those cones without cutting it open That is a great idea, Olov rolled ordinary cones and I cut them open and bashed them to shape. What program did you use to make the pattern for that cone? Earlier I´ve used Cone Creator but it won´t work on my Macbook.
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Oct 21, 2013 16:10:11 GMT -5
Hey Anders, I used google sketchup and a tiny plugin that will allow you to unfold 3d objects Sketchup (free)Unfold tool (like 2kb)All round 3d models in sketchup are composed of 24 or 48 2d faces. To make this kind of cone: Use this pic as reference, it's a bit big1 first draw a circle with the right diameter (make sure you compensate for whatever material thickness you are using for the real thing) 2 draw a vertical line from the centre of the circle to whatever hight you want your cone to be 3 draw a correctly sized square on top of the line, using the endpoint of the line as its centre 4 manually draw lines between the 24 edges of the circle and the 4 edges of the square to flesh out your cone 5 click on the unfold tool(plugins >> unfold)and then manually click on the faces you just created to watch the model unfold 6 select your flat pattern and grab a corner with the "move" tool and snap the model to the origin 7 use the "rotate" tool to rotate the flat pattern so that it exist in 2 dimensions and not three 8 click camera>>paralel projection and then camera>>standard views and pick a view that will centre the camera dead on. Now you can technically print the cone. BUT! google sketchup is realy annoying in that it wants to print even small drawings over like 4 or 8 pages. If it's just one cone for one time, you can mess with the zoom and print functions to get it down to a managable 2 or 3 pages. If you want to use Sketchup more (highly advised ), download sketchup pro, it has "Layout" included. It will allow you to manouvre any sketchup object on a virtual paper for printing (I used it to make the layouts for the M500, exported the files to pdf and printed on A0 at school) 8 hour pro trial (layout should be included) linkI'm sure you could find a "better" version on a torrent site somewhere
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Post by Johansson on Oct 21, 2013 22:23:23 GMT -5
Thanks a lot Joost!
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Post by Johansson on Oct 23, 2013 16:20:58 GMT -5
Finished welding the flame tubes an hour ago. Cheers! /Anders
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Post by racket on Oct 23, 2013 16:38:30 GMT -5
Hi Anders
Very professional job ...........heh heh , you're getting good at this engine building :-)
Cheers John
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on Oct 23, 2013 21:06:47 GMT -5
Hi Anders The twin turbojet looks very exciting! How are you going to feed the fuel to the evaporators, nozzles? syringes? Cheers Erik
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Post by Johansson on Oct 23, 2013 22:50:22 GMT -5
Thanks John! Erik: We´ll copy the old jet kick and use syringes, it worked like a charm so even though spray nozzles could work given the large diameter of the vapor tubes we´ll go with the proven concept of syringe injection. There are enough things that can go wrong with a build like this anyway without us adding even more on purpose. Cheers! /Anders
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Post by Johansson on Oct 26, 2013 13:30:57 GMT -5
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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 Oct 26, 2013 15:35:03 GMT -5
Holy crap, those are huge turbos!
As always your fabrication skills are making me jealous, are you going to post some pics on the injector arangement when you make it? I think I get how the vaporising tubes are supposed to work but I'm not sure how the syringe needles fit into things as the fuel flows must be really high on this build?
Cheers,
Jon
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Post by racket on Oct 26, 2013 17:42:19 GMT -5
Hi Anders
Lookin' good :-)
LOL......are those ammunition boxes you're using for chocks under the turbos , where would we put stuff in a workshop without them .
Are you beefing up the "rails" this time , I sorta remember you thinking they were a bit "flexy" last time .
Yeh Jon , I wish I had Anders working in my shed :-)
Cheers John
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Post by Johansson on Oct 27, 2013 4:56:55 GMT -5
Holy crap, those are huge turbos! As always your fabrication skills are making me jealous, are you going to post some pics on the injector arangement when you make it? I think I get how the vaporising tubes are supposed to work but I'm not sure how the syringe needles fit into things as the fuel flows must be really high on this build? Cheers, Jon Hi Jon, Yeah, they are quite large with an 80mm inducer. Should be good for slightly above 50kg thrust with afterburning and water injection. I´ll post pics of the injection when I get there, I proposed a different arrangement with a top placed "tree type" vapourizor but we agreed that we should go with the old tried type given that we only have a couple of months to finish the kick. Cheers! /Anders Hi Anders Lookin' good :-) LOL......are those ammunition boxes you're using for chocks under the turbos , where would we put stuff in a workshop without them . Are you beefing up the "rails" this time , I sorta remember you thinking they were a bit "flexy" last time . Yeh Jon , I wish I had Anders working in my shed :-) Cheers John Hi John, They are ammo boxes indeed, a friend of Olov gave them to us and they are great for storage since they are water proof and all. We have built a sub frame for the kick so the runners are very stiff now, should be a pleasant ride. =) Keep me fed 7 days a week and slightly drunk on saturdays and I am all yours! Cheers! /Anders
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Post by turbochris on Oct 27, 2013 9:27:51 GMT -5
deth kick
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on Oct 30, 2013 2:42:04 GMT -5
Thanks John! Erik: We´ll copy the old jet kick and use syringes, it worked like a charm so even though spray nozzles could work given the large diameter of the vapor tubes we´ll go with the proven concept of syringe injection. There are enough things that can go wrong with a build like this anyway without us adding even more on purpose. Cheers! /Anders Hi Anders Okey, thank you for explaining. I am following your new built thread & can you please take some pictures of the fuel injectors when you get there? Cheers Erik
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Post by Johansson on Nov 1, 2013 16:45:24 GMT -5
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Post by racket on Nov 1, 2013 21:21:57 GMT -5
Hi Anders
This is gunna be one fine looking kick :-)
Cheers John
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