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Post by Johansson on Apr 25, 2016 15:51:10 GMT -5
It´s been very quiet here lately, not because I´ve been lazy but because I´ve been busy building a new workshop for the gas turbine bike! The room will also double as a dyno room, I have managed to get my hands on a large centrifugal fan that I will build a fan brake dyno bench from. It was powered by a 215hp electric motor so it is a serious piece of fan, the idea is to measure the pressure drop over a known restriction and find the HP number from the compressor map. My friend Olov came over and helped me put it next to the workshop, it is too big to keep in the workshop while building the dyno bench from it. It will confuse the hell out of my neighbors for sure. He also unloaded a lathe that I "inherited" from my father yesterday, a nice big italian lathe that will come in very handy when building the JU-02 since my old bench lathe is too small for the job. Cheers! /Anders
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ripp
Veteran Member
I'm sorry, I don't speak english, so I torment you (and myself) with a translation program,Sorry
Joined: January 2013
Posts: 230
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Post by ripp on Apr 25, 2016 23:54:38 GMT -5
impressive hardworking!
Cheers Ralph
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Post by racket on Apr 26, 2016 2:36:16 GMT -5
Hi Anders
LOL..................welcome back , I've been missing your regular progress updates :-)
Now thats a serious loader , makes light work of shifting heavy lumps of cast iron/steel
cheers John
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Post by Johansson on Apr 26, 2016 5:18:23 GMT -5
Thanks guys!
I´ve put the jet manifacturing on the shelf for a while to get the workshop in order, it is starting to come together so hopefully I can get an evening of JU-02 building done soon.
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Chuks
Senior Member
Joined: August 2015
Posts: 497
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Post by Chuks on Apr 27, 2016 14:14:04 GMT -5
In case you need my help to Single-handedly carry those machine to it new position it will be a great pleasure. looking forward to see UPDATES on the mighty JU-02.
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Post by Johansson on Apr 27, 2016 16:16:57 GMT -5
Here is an update for you Chuks, I decided that the workshop had taken way too much time from the JU-02 project so it was time to put the new lathe to good use. Drilling four M10 holes for the countersunk screws that will hold the NGV to the shaft tunnel. Here I have turned the guide edge that will keep the NGV and shaft tunnel centered. Test fitting time! I had to make a small jig to fixate the piston ring seal seat before welding it to the NGV, here I have just finished welding it in place. The other side, the reason for the added seat it because the piston ring sits a bit inside the shaft tunnel and I didn´t want to machine it from a 30mm thick NGV plate... Then I drilled the M10 screw holes in the shaft tunnel so I could fit the two together. Threading the holes... I found a countersink tool that wasn´t at all meant for stainless, but it did the job anyway. Squealed quite a bit though... It is slowly starting to resemble a gas turbine engine... Cheers! /Anders
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Chuks
Senior Member
Joined: August 2015
Posts: 497
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Post by Chuks on Apr 27, 2016 18:15:22 GMT -5
thanks for all the pics JOHANSSON, very neat work.... i can't tell how many decades it will take me from now to fully reach to these level.
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Post by racket on Apr 27, 2016 19:32:38 GMT -5
Hi Anders
Nice .
Whats the maximum swing on the new lathe ??
Cheers John
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Post by Johansson on Apr 28, 2016 4:29:37 GMT -5
Your work looks really good Chuks, so don´t belittle yourself. John, I´m tempted to say infinite but at least very large since a part of the bed closest to the chuck is removable. I´ll measure it next time I am in the workshop. Cheers! /Anders
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aki
New Member
Joined: March 2014
Posts: 4
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Post by aki on May 7, 2016 16:05:32 GMT -5
Really cool method for building a dyno, will enjoy seeing that come in to play!
Did you happen to snap any pictures of the welding jig for the piston ring seal?
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Post by Johansson on May 11, 2016 13:54:30 GMT -5
Really cool method for building a dyno, will enjoy seeing that come in to play! Did you happen to snap any pictures of the welding jig for the piston ring seal? Yeah, that will be a fun project for sure! Unfortunately not, but it is just an aluminum chunk with a turned down groove in the middle for the seal body.
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Post by Johansson on Jun 22, 2016 13:18:22 GMT -5
I´ve been thinking about a way to improve the takeoff and raise the power output from the freepower, namely to fit a belt driven drive clutch (like on a snowmobile) on the gearbox output shaft. That way I can adjust the weights and spring load to keep the freepower revs in the upper 3/4´s all the time instead of having to start from 0rpm. Any thoughts about this? I have no idea if I can fit it to the frame and with the JU-02 engine installed I don´t even know if I will need more power, it is just an interesting idea that needs to be bounced around a bit.
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Post by smithy1 on Jun 22, 2016 18:44:18 GMT -5
Anders,
I believe Andy has a clutch setup on his bike, you might want to pick his brains..!
Cheers, Smithy.
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Post by racket on Jun 22, 2016 20:33:26 GMT -5
Hi Anders Unless you want to drag race the bike, a "clutch" isn't necessary , you'll only save maybe 2 seconds on your time until you're well into the power band . Remember , you have 80% of your power at 50% of your RPM , its a very "fat" power curve , this is Andrews dyno test at only 25 PSI P2 postimg.org/image/4g1ghuvct/ . Even my old TV84 turbine bike was up to respectable speeds/N2 in only a few seconds www.youtube.com/watch?v=P-5PgWqgIJo In Andys case where every 1/10th second counts , theres a good reason to get just that bit extra off the line and it justifies the extra complication , but for you I feel its only a complication/cost you can do without..............save your energies for the JU-02 ;-) Cheers John
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Post by Johansson on Jun 27, 2016 4:53:36 GMT -5
Very true John, I think the benefits would be greater on a street ridden bike where you could adjust the clutch so that the bike can idle without any torque applied on the rear wheel. For me it is just another thing that needs adjusting and can possibly fail during a run, even though the idea of tuning the clutch (it is actually more like an automatic gearbox) so that the freepower turbine runs between 80-100% rpm all the time is rather tempting.
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