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Post by racket on Jul 24, 2014 17:25:36 GMT -5
Hi Anders
LOL.........nice travel video of the Swedish countryside , it looks like everyone is "making hay whilst the sun shines" ;-)
Bike goes very nicely , sweet sound as you cruise along at "idle" rpm ................heh heh , just wait to you wind her up over 2 bar P2 .
Excellent result for all your hard work, congratulations on a successful first road test, they're always an extremely stressful time , you can relax and enjoy the next ride :-)
Cheers John
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ashpowers
Veteran Member
Joined: February 2011
Posts: 207
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Post by ashpowers on Jul 24, 2014 18:06:54 GMT -5
Freaking awesome, Anders! Thanks for the english narration too! This is really inspirational and I look forward to seeing more updates!
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Post by racket on Jul 24, 2014 19:17:09 GMT -5
Hi Ash
Don't forget you're a big part of Anders success as you're the guy who originally found the TV94 comp and turb combination we're all using , I for one am forever grateful for you helping me out all those years ago :-)
Cheers John
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Post by finiteparts on Jul 24, 2014 20:43:02 GMT -5
Hey Anders! That is f'in sweet!!! It sounds like a dream and appears to be really responsive...it goes without saying, you do amazing work!
You need to submit the video to the GoPro website...maybe you can win their daily video contest.
Thanks for posting the video and thanks for the English narration since my Swedish is a bit weak...and by that I mean none. hehee!
~ Chris
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Post by Johansson on Jul 25, 2014 1:23:05 GMT -5
Hi Anders, AWESOME!!!!!! Cheers, Mark.. Thanks! Great video and narration All your hard work is paying off. Congrats !! Regards. Steve. Yeah, the mods done to the original engine over the last couple of years works like a charm. Not it feels like I can trust the engine to at least start and run, not much left now before I can trust it to run at full throttle as well. Hi Anders LOL.........nice travel video of the Swedish countryside , it looks like everyone is "making hay whilst the sun shines" ;-) Bike goes very nicely , sweet sound as you cruise along at "idle" rpm ................heh heh , just wait to you wind her up over 2 bar P2 . Excellent result for all your hard work, congratulations on a successful first road test, they're always an extremely stressful time , you can relax and enjoy the next ride :-) Cheers John We´ve had 25-30°C and sun for almost two weeks now, people are actually starting to long for the usual Swedish 15°C and rain summer weather. Do I need to tell you it was a bit hot to push the bike back to the house in full leathers... The strange thing was that I wasn´t stressed at all about the test, usually I need to take two or three dumps before I run the engine but now it was almost like starting the old Triumph. Almost. I am still a bit worried about the temps, if I pass 800°C TOT at only 1.5bar P2 I need to do something before it can be run any higher. I´ll try to remove the freepower section and run it with an unrestricted nozzle to see what happens. The camera logging of the gauges is great since I have a hard time remembering much about the runs afterwards. You know this already, but I owe much of my success to you John. You´ve been a great mentor during the build and I wouldn´t be anywhere near a running bike if it wasn´t for you. Hats off! Freaking awesome, Anders! Thanks for the english narration too! This is really inspirational and I look forward to seeing more updates! Thanks Ash, and as John states I owe you a big one for finding the TV94 rotary parts! Hey Anders! That is f'in sweet!!! It sounds like a dream and appears to be really responsive...it goes without saying, you do amazing work! You need to submit the video to the GoPro website...maybe you can win their daily video contest. Thanks for posting the video and thanks for the English narration since my Swedish is a bit weak...and by that I mean none. hehee! ~ Chris Thank you Chris! It is actually very responsive to the throttle, it runs much like a turbocharged motorcycle with a little bit of throttle lag but definitely not annoyingly so. You are welcome about the change of language, I assume english is the main language for the followers of this build so I will try to avoid Swedish in the more interesting videos from now on. An interesting thing in the video is when the engine shuts down at the end, notice the oil pressure disappearing for a second when I stop in the somewhat steep intersection. The oil pump must have sucked air due to a bit low oil level and the tilt of the tank, the Hobbs switch shuts the fuel pump of immediately so that is a great relief to know it works like it should.
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Post by Johansson on Jul 25, 2014 1:51:59 GMT -5
Here is the full GoPro video of the road test.
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 Jul 25, 2014 2:18:07 GMT -5
Hi Anders, congratulations! fantastic work. four and a half year up and down `s, you're a tough lad. many thanks again for sharing your Project send me your paypal account email, I would like to donate you and your friends some beer.
regards
Ralph
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Post by racket on Jul 25, 2014 3:57:44 GMT -5
Hi Anders
Thanks for the new video , I could almost feel the wind in my face, it bought back pleasant memories :-)
Heh heh, pushing motorcycles on a hot day ain't fun , but a very good test of the Hobbs .
Now, what we all want to know is "numbers" ...............what speed , how far , what was acceleration like etc etc ........
Idle P2 looks like ~0.7 bar -10 psi , yep , probably a bit high , I found a P2 of ~7psi - 0.5 bar was all I could use before my first turbine bike would start to "creep" , the TV94 has ~40% bigger flow than my old TV84 so you might need to get idle back to ~5 psi -0.35 bar for it to stop wanting to edge forward , the only problem with having a "civilised" idle was the "cold" engine didn't like to start with the lower fuel flow, I needed a minor increase in flow to get the engine past self sustain and idling ...........a bit like an IC engine requiring more fuel when cold.
Yep , we've gotta find out why all of our engines seem to be running hotter than desired, maybe some sort of wastegate to help reduce back pressure at idling and low freepower rpm, which can be progressively closed as rpm rise ................Andrew should be doing his Dyno test soon and it'll be interesting to see how ITT temps behave with changing freepower rpm, if it is the freepower blade design , they do have a lot of deflection angle , then a wastegate is the logical solution .............but your test without the freepower in place should soon indicate whats going on .
A very successful test ride, I dare say you're itching to throw the leg again as soon as possible :-)
Cheers John
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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 Jul 25, 2014 3:59:48 GMT -5
my opinion to the high exhaust gas temperature. the secondary holes in the combustion chamber are too close to the ngv. the exhaust has too little space to mixing with the cool air. moreover, there is a constriction in the combustion chamber. you can try before a conversion of the combustion chamber are the walls off the sticks thin enough flared end the injection needles lying with pressure on on the inner side of the sticks sv-precious-moments.com/xbob_files/image016.jpglook at the secondary holes of the combustion chamber at full throttle 0:55 min and see the glowing end of the sticks www.youtube.com/watch?v=8E8XKVNif6gregards Ralph translate.google.at
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Post by madpatty on Jul 25, 2014 10:14:53 GMT -5
WELL done Johansson... All this work had been great inspiration for me...
Was that just "idle" rpm....!!!
Cheers, Patty
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Post by Johansson on Jul 25, 2014 12:12:45 GMT -5
Hi Anders Thanks for the new video , I could almost feel the wind in my face, it bought back pleasant memories :-) Heh heh, pushing motorcycles on a hot day ain't fun , but a very good test of the Hobbs . Now, what we all want to know is "numbers" ...............what speed , how far , what was acceleration like etc etc ........ Idle P2 looks like ~0.7 bar -10 psi , yep , probably a bit high , I found a P2 of ~7psi - 0.5 bar was all I could use before my first turbine bike would start to "creep" , the TV94 has ~40% bigger flow than my old TV84 so you might need to get idle back to ~5 psi -0.35 bar for it to stop wanting to edge forward , the only problem with having a "civilised" idle was the "cold" engine didn't like to start with the lower fuel flow, I needed a minor increase in flow to get the engine past self sustain and idling ...........a bit like an IC engine requiring more fuel when cold. Yep , we've gotta find out why all of our engines seem to be running hotter than desired, maybe some sort of wastegate to help reduce back pressure at idling and low freepower rpm, which can be progressively closed as rpm rise ................Andrew should be doing his Dyno test soon and it'll be interesting to see how ITT temps behave with changing freepower rpm, if it is the freepower blade design , they do have a lot of deflection angle , then a wastegate is the logical solution .............but your test without the freepower in place should soon indicate whats going on . A very successful test ride, I dare say you're itching to throw the leg again as soon as possible :-) Cheers John Hi John, Yeah, the idle was unnecessarily high just to see if I could get the temps down a bit. The non-freepower test will be an important one to do, this will show if there is something wrong with the theory and the NGV needs to be opened up some. A wastegated freepower scroll is an option but I would prefer the simplest approach in this (correct throat size) to have as few parts that can mess up a run as possible. I am itching indeed, but first thing´s first. Time for some more testing and modifying to get things sorted out, I want the turboshaft engine to run just as reliably as the turbojet-edition did at last. my opinion to the high exhaust gas temperature. the secondary holes in the combustion chamber are too close to the ngv. the exhaust has too little space to mixing with the cool air. moreover, there is a constriction in the combustion chamber. you can try before a conversion of the combustion chamber are the walls off the sticks thin enough flared end the injection needles lying with pressure on on the inner side of the sticks sv-precious-moments.com/xbob_files/image016.jpglook at the secondary holes of the combustion chamber at full throttle 0:55 min and see the glowing end of the sticks www.youtube.com/watch?v=8E8XKVNif6gregards Ralph translate.google.at Hi Ralph, Interesting ideas, are you basing the combustor redesign on the heat pattern or just from the looks of the hole arrangement? The thing is the engine ran just fine before I added the freepower section and the air intake box to it, so my guess is that something before or after the gas producer is causing the rise in temps. I didn´t quite understand what you were saying about the combustor restriction and vapor tubes, can you please explain it a bit further? Cheers! /Anders
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Post by Johansson on Jul 25, 2014 12:15:15 GMT -5
WELL done Johansson... All this work had been great inspiration for me... Was that just "idle" rpm....!!! Cheers, Patty Thank you Patty! And it was perhaps closer to mid-throttle but nothing more than that, check the older test bench videos out to get an idea of the difference between 1.5 bar and 2.6 bar as I ran it at as a pure jet engine. *GRIN*
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Post by Johansson on Jul 25, 2014 15:46:12 GMT -5
Hi Anders, congratulations! fantastic work. four and a half year up and down `s, you're a tough lad. many thanks again for sharing your Project send me your paypal account email, I would like to donate you and your friends some beer. regards Ralph Thanks a lot Ralph for the beer money! It sure comes in handy at the moment when it is 29°C outside, I´ll down a cold one tomorrow at the pub!
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Jul 25, 2014 15:57:46 GMT -5
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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 Jul 25, 2014 16:08:04 GMT -5
Hi Anders, the hole arrangement looks like from KJ66 turbine and should be ok. the secondary holes are blown into the nvg and not in the combustion chamber. they should be arranged so as here www.youtube.com/watch?v=nxr7ZLanheUthe exhaust gas temperature should be about 560 degrees. this temperature you have unfortunately not reached in any test run. you must first try to reach this temperature before you adjoins the freepower turbine. so I would start with the combustion chamber. regards Ralph translate.google.at ps. sorry for my Translation english,
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