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Post by racket on Jun 4, 2016 2:31:14 GMT -5
Possibly the pressure drop across the flametube "forces" the flametube onto the NGV
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jun 4, 2016 3:37:53 GMT -5
Ohh, yea, possibly, Kamps doesn't mention anything about securing it
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Post by jetjeff on Jun 5, 2016 14:44:42 GMT -5
Hi All, Here are some pics of the die I made to make the front ring of the burner can. I first piece came out OK, I may try to crush another one. The one side of the die is reversible, so I can make the front ring, then flip it 180 degrees to make the back ring. Jeff
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Post by Johansson on Jun 5, 2016 15:30:54 GMT -5
Nice die Jeff, almost a shame that such a great looking tool is only meant for one or two jobs and then put on the shelf. I´ve made a 180° die for hammering out the combustor front wall for my JU-02 but that is one crude contraption compared to this.
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Post by jetjeff on Jun 5, 2016 16:05:13 GMT -5
Thanks Anders,
I took my wind-surfer to the lake today. Wouldn't you know it, as soon as I got there the wind died off. Summer goes by fast in Michigan and I try to hit the lake on every breezy day, which isn't many where I live. I need to mount a turbine on it,,,lol.
Jeff
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Post by jetjeff on Jun 5, 2016 16:20:14 GMT -5
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Post by Johansson on Jun 6, 2016 0:49:42 GMT -5
Yup, a gas turbine would suit it perfectly!
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jun 6, 2016 4:05:32 GMT -5
The die looks like it works great Jeff! Yep, that board would look cool with a Heineken jet mounted on it
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Post by jetjeff on Jun 9, 2016 4:25:11 GMT -5
Hi All, I polished the turbine blades on the combustion chamber side down to 1000 grit, looks like chrome. I know Kamps says polishing the blades provides no measurable increase in thrust, but I figure it can't hurt. Jeff
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Post by smithy1 on Jun 9, 2016 14:20:05 GMT -5
Hi Jeff, how are you planning to balance the rotor assy?
Nice and shiny, pity it won't stay that way for more than 3 seconds.. ;-)
Cheers, Smithy.
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Post by jetjeff on Jun 10, 2016 0:58:33 GMT -5
Hi Smithy,
I have a JetJoe rotor balancer, but I'm not sure this rotor will fit. I also have a Du-Bro prop balancer, I could use to get the compressor in the ball park. I've watched on YouTube and read in books every balancing idea known to man,,,lol. Another thought is using my smart phone with a vibration app, believe it or not, it is quite sensitive.
According to Kurt, this engine shouldn't exceed around 50-55k, so ultra precision balancing shouldn't be required. I could always use Kurts suggestion in the book for balancing.
I also thought about making an air bearing to get the turbine wheel close. Seems like you'd want to balance the individual components, then the rotor as an assembly.
Jeff
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Post by jetjeff on Jun 10, 2016 4:25:15 GMT -5
Hi All, Testing the vibration app on my smart phone with something I thought would simulate a high frequency vibration. I built that guitar from scratch BTW. Jeff
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Adam
Veteran Member
Joined: May 2016
Posts: 101
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Post by Adam on Jun 10, 2016 5:18:18 GMT -5
Nice guitar Jeff! The app looks interesting, looks like it must be really sensitive.
Adam
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Post by jetjeff on Jun 11, 2016 23:56:56 GMT -5
Hi All, I bent the U shaped evaporator tubes, but I need to know how much of a gap between the end of the tube and the front wall of the burner can I should have. I was thinking about 1/4"? Builder Tip: I used a short section of flexible weed whacker shaft inserted inside the tube to keep it from collapsing while bending. Jeff
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Post by racket on Jun 12, 2016 0:10:07 GMT -5
Try 1.5 times evaporator diameter (OD) as the clearance
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