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Post by Johansson on Apr 12, 2017 2:01:43 GMT -5
Hi Anders, I'm not much for words or blowing sunshine but you have an incredible gift. Your work is mind blowingly inspirational. I'll be following. This forum is blessed to have a Tony Stark (Anders) and a Howard Hughes (John) for everyone to watch and learn from. Tony Hi Tony, Thank you very much, I am not sure that I agree on the gift part except for being stubborn and single minded (ask my Anna about it... ) but I am glad that what I do is inspiring. That is the beauty with forums like this one, we contribute and learn from each other with no strings attached. As soon as there is money involved people close up like clams about what they know but since all we do here is spend hard earned money on a fun hobby there is nothing to lose by sharing our ideas and thoughts with others. Cheers! /Anders
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Post by Johansson on Apr 9, 2017 16:23:47 GMT -5
Hi Anders LOL............just hook up the plumbing ;-) Cheers John Hi John, I was tempted for a split second to do just that, but I think I will do this the proper way after all with bench testing, modifying et cetera until it is ready to hit the road. Cheers! /Anders
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Post by Johansson on Apr 9, 2017 15:08:32 GMT -5
With JU-01 taken out of the bike chassis I had the opportunity to test fit JU-02 to see if the feet are spaced apart properly and how close to the fuel tank the oil return fitting will sit. And of course to see what it will look like. Old JU-01 engine installed: New JU-02 test fitted, it sure fills out the chassis better. Oh yes. Other side: To sum this up I can´t wait until I can install JU-02 in the bike and grab a handful of throttle! Cheers! /Anders
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Post by Johansson on Apr 9, 2017 15:02:33 GMT -5
A pic from before the test, I have some video as well but it is pretty much worthless since the bike didn´t start. Engine removed from the bike and uncovered in 5 minutes. 15 minutes more and it looked like this. Now I just have to wait for the syringes to arrive... Cheers! /Anders
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Post by Johansson on Apr 9, 2017 12:55:30 GMT -5
I tried the bike again today with newly filled scuba tanks, but no go. The engine won´t increase in revs when the fuel is applied, it just sends billowing flames out the exhaust pipe. After some consideration I measured the inner diameter of the syringe injectors, both the new ones and the ones I used before. Small wonder the engine didn´t run, the new green size syringes have an inner diameter of slightly over 0.5mm while the old ones was a snug 0.4mm ID. The flow areas are 0.23mm2 compared to 0.125mm2, in other words almost twice the flow area. Looking at some syringe charts found with Google there seems to be some kind of confusion with the color markings, for example Black can be both 0.305mm OD and 0.7mm OD depending on where on what chart you look at... I´ve just ordered a set of 0.7mm OD Black syringes which should be of the same size as the old ones that apparently worked just fine, they choked at around 2.5bar P2 but with water injection I think I should get some decent speed out of the bike anyway. Good thing I found this out now and not a week before the One Mile race. Cheers! /Anders
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Post by Johansson on Apr 4, 2017 15:34:00 GMT -5
After the failed test start of the bike I rolled a strip of stainless sheet for the JU-02 air deflector. Here I have welded it in place, it neatly divides the air exiting the diffuser and sends an estimated 1/3rd of the air towards the inner combustor liner. I also got a parcel with the stainless screws I ordered a couple of days ago, very quick delivery from UK. As you can see the engine is almost completely assembled for its maiden run, I haven´t fitted the fuel injectors and there is some work left to do with the test stand before that. Now that the engine isn´t spread all over the work bench I will give the turbofan build some attention but it isn´t long before JU-02 is ready to rumble! Cheers! /Anders
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Post by Johansson on Apr 4, 2017 15:01:55 GMT -5
I did a test with the bike today but ran out of air in the scuba tank before I had figured out the idle throttle setting, I´ll give it another go once I have had the scuba tanks filled.
Cheers! /Anders
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Post by Johansson on Apr 4, 2017 7:25:51 GMT -5
Hi Anders, I finally had the time to read this thread completely and I have to tell you that your craftsmanship is just incredible! There are a lot of hints and tips how to manufacture the different parts of a turbine engine. Thanks for sharing your knowledge in such a detailed way! Keep up the good work! Cheers, Marvin Thank you very much Marvin!
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Post by Johansson on Apr 3, 2017 23:18:26 GMT -5
Unless it is a copyrighted drawing it would be interesting to see it, you need to post the video though! There are waaaaay to few pulsejet builds at JATO.
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Post by Johansson on Apr 3, 2017 23:02:06 GMT -5
Do you have any means of video taping the next start attempt? It would be much easier for us to comment on how the engine behaves then.
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Post by Johansson on Apr 3, 2017 14:13:20 GMT -5
Hi John and Ralph, Please continue the discussion about this, it is very interesting to read. I´ll stay out of it though. I checked the engine out just now and it looks like a straight strip of sheet stainless 16mm wide will split the air diffuser exits neatly in half. Cheers! /Anders
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Post by Johansson on Apr 3, 2017 13:05:28 GMT -5
Anders, Your work is an inspiration. The things you have done are unbelievable, not normal and insane. In a good way. Thank you very much Hydrazine! I just need to point out that Olov is just as responsible for much of the stuff I have posted here, the turbine bike and JU-02 build are my own but the jet kick sled and this turbofan ice yacht are joined efforts. Cheers! /Anders
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Post by Johansson on Apr 3, 2017 5:12:37 GMT -5
Awesome build quality Feathers!
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Post by Johansson on Apr 3, 2017 2:36:42 GMT -5
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Post by Johansson on Apr 3, 2017 1:21:25 GMT -5
Hi John, Good pointer about the load cell calibration, I´ll make sure to do that. I haven´t decided what to do about the air deflector yet. I am sort of allergic to solving problems I don´t know if they even exist, but I know you you have good experience with them and JU-01 apparently works even if I haven´t run it without the deflector so I really don´t know how much higher the core temps would be without one. Still, it is a quick job to add one so perhaps I should do it just to avoid the risk of an overheated inner liner. Decisions decisions... Cheers! /Anders
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