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Post by Johansson on Apr 24, 2017 14:27:27 GMT -5
Hi guys! I ran the bike tonight with good results, the engine started and ran up to idle with seemingly lower exhaust temps than before. I say seemingly since I didn´t have a chance to check it over a longer period of time, the home designed PWM controller for the fuel pump had an undersized transistor with an overload safely feature that cut the pump voltage as soon as the fuel pressure started to rise. Olov helped me find the problem over the phone so I am very satisfied with todays run, it is great to be able to sort these issues out this early in the season! Cheers! /Anders
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Post by Johansson on Apr 24, 2017 4:46:44 GMT -5
Hi Anders, The engines looking good. Is the wet spot in the photo of the combustor posted on Apr 9, 2017 at 4:02pm located at bottom dead center (BDC)? Such that it is just the manifold bleed-down after the fuel pump is shutdown? (...) Sorry Anders for highjacking your post, but I really wanted to share my two-cents on this topic. ~ Chris Hi Chris, Yup, it is at the bottom of the manifold so it is just the kero inside it that has bled out after the start attempt. No highjacking at all, this discussion is both relevant and interesting. By the way I assembled JU-01 last night and reinstalled it in the bike, oil leak test done and preheat tested so as soon as I find a spare afternoon I can do another start attempt! Cheers! /Anders
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Post by Johansson on Apr 22, 2017 11:38:58 GMT -5
I have a 3D scanned file of the KTS X846 compressor, if you want to I can upload it on Onedrive and send you the link. Hi Anders, Can you please share the scanned file. I want to 3d print the compressor wheel. Cheers. Here is the link to the 3D scanned compressor wheel file, the bottom isn´t flat so I had to lower the part into the print table a couple of mm´s in the slicing program to be able to print it without supports. 1drv.ms/u/s!Al-NA61DKl01gnoXzPq9OeXRlATb Cheers! /Anders
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Post by Johansson on Apr 21, 2017 16:58:26 GMT -5
I made the last bracket for the test stand tonight, now it is rock solidly mounted to the dyno fan base. Cheers! /Anders
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Post by Johansson on Apr 21, 2017 16:56:56 GMT -5
John: If JU-02 starts pushing itself forward now I must have plenty of thrust... Skynet: I planned to make an electric starter for JU-01 but since the air start works so well I decided to save the starter for JU-02 instead. I have a 3D scanned file of the KTS X846 compressor, if you want to I can upload it on Onedrive and send you the link. Andy: Thanks!
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Post by Johansson on Apr 21, 2017 16:51:30 GMT -5
The new 0.7mm syringes arrived yesterday! Needless to say Friday night was workshop night, here I am removing the old syringe injectors from the fuel plenum. I am glad I have small hands and kept from drinking overly much coffee... With all of the 18 injectors silver soldered and bent into shape I could test flow them with propane, all had the same flame height so they are good to go. Before I called it a night I assembled most of the JU-01, so there is not much work left before I can do another test start! Cheers! /Anders
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Post by Johansson on Apr 20, 2017 12:56:22 GMT -5
You dont need another company to work for. You are your own Swedish Aerospace Corporation. Keep doing exactly what you are doing, prosper from it and have fun while you're at it. You can do all kinds of killer technology developments with skills like yours. Make it work for you. Very few people on the face of the planet can do what you have done in this thread. *Especially at your age.* Your kick sled! That is so badd ass. It's a cluster of pure engineering awesomeness. Not only you designed and built your own turboshaft bike, which is insane, you drove the creation at over 165MPH! That's off the charts awesome! Seriously, if a typical aerospace company had to do what you did in this thread, they would have to employ a whole team of people from multiple different departments & engineering backgrounds and with a union machine shop as a collaborative effort. Of course they can make it really good but it takes at least 100 people working on it just to make anything happen. Plus a million dollars just to begin a discussion of the objectives. That's the typical aerospace engineering environment. I know because I worked in it. You are just one guy... doing what would take 100+ at Boeing to replicate. It is important to keep having fun doing this, forcing oneself to struggle on to satisfy some demanding sponsor would kill all of the joy with this hobby. Doing it like Feathers do with the turboshaft gocart where a team of skilled people all contribute in their own way and make a really impressive machine would be fun, but knowing what a stubborn bastard I am it is probably best if I keep to my one man show. Patty has a very valid point in his last post, stuff like this only impress the like minded. Showing a build thread like this to an employer not familiar with gas turbines might even be a bad thing since some people tend to dislike what they don´t understand. Cheers! /Anders
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Post by Johansson on Apr 19, 2017 15:00:07 GMT -5
After a great Easter weekend with the family I managed to get some work done on the test stand, I borrowed a magnet drill from work to drill bolt holes in the someday-to-be fan dyno stand. Here the test stand is bolted in place. I need to add a rear bracket but I can do that later, I drilled a bolt hole for it while I had the magnet drill at home. Cheers! /Anders
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Post by Johansson on Apr 18, 2017 15:21:59 GMT -5
Yeah. I understand. That would be a drastic change for you and the family. Just keep doing what you are doing and things will happen for you. Unfortunately I don´t live in the best place on earth with regards to fun jobs, a small sized city in the middle of the Swedish back country. No industry jobs to speak of except for welding plows and such, so I am glad to have one of the more interesting jobs as a district heating mechanic.
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Post by Johansson on Apr 18, 2017 13:25:52 GMT -5
If I didn´t have a family here in Sweden I´d be jumping at any opportunity to get employment at one of those companies, with two kids and a house it gets a bit more complicated since I would have to ask the family to leave friends and schools just so that I can get me a fun job.
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Post by Johansson on Apr 18, 2017 12:32:32 GMT -5
Have read up to page 44 so far and still cant believe my eyes. With a thread like this on your resume, you can get a job at any Aerospace company. Sweeping the floors perhaps, I strongly doubt that an uneducated backyard tinkerer like myself would fit in with the schooled shirt and tie guys. I like the thought though.
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Post by Johansson on Apr 18, 2017 5:06:30 GMT -5
This thread is so full of WIN its sick. Two thumbs up Anders. Thanks!
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Post by Johansson on Apr 18, 2017 2:30:41 GMT -5
Hi Anders, I got my s/g adapter from Everett Aero in the UK it was an extra to the S/G which was purchased from them at the same time. They may have more of them but they didn't have the V band clamp that came from a wrecking yard in Florida for USD60. I've posted the s/g wiring and pics on my thread sorry for the delay mate! Cheers Rene Hi Rene, Thanks for the hint, I´ll send Everett an email about it. Large v-band clamps can be bought new in any size nowadays for relatively little money so that isn´t a concern. I´ll check the wiring pics out! Cheers! /Anders
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Post by Johansson on Apr 16, 2017 11:29:02 GMT -5
Great find Anders. Have you experimented with water/meth injection? I am about to, I have built a water/methanol injection system for my bike but havent had time to test it yet. Hopefully I'll have it tested before this summers One Mile race.
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Post by Johansson on Apr 12, 2017 5:00:25 GMT -5
Wow Tony, that is one hell of a career! It must have been fashinating to work at those places, especially during the Cold War era when no expenses were saved in order to be ahead of the competition regarding long range missile development etc.
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