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RE: JetJoe OWNERS thread
1 Attachment(s)
Hi BJ
Yes,silver solder melts easily,but works just fine on the injector needles. The vapouriser tubes are inconel and they have been flared at one end and installed into the rear end cap. The whole assembly is in a jig,ready to be tig welded. Regards Craig |
RE: JetJoe OWNERS thread
Hi Craig,
I've been keenly watching your progress on the combustion chamber build, I must say that you are doing a great job, an education for all of us and I admire your skills and tooling expertise, well done to you Sir. I suspect that it will work very well indeed. All the best, Smithy. |
RE: JetJoe OWNERS thread
ORIGINAL: KJ-66 I`ll be making a new shaft tunnel and shaft assembly,with a different preload system. I don`t like o-rings inside a shaft tunnel. They must seal fluids etc and not support bearing cases. So that is a section on its own and when thats done,it will be time to light the fire and see what my neighbours say? Regards Craig |
RE: JetJoe OWNERS thread
Say... Smithy...
Send Craig some detailed pics of a JJ-3000 burner - maybe he'll tool-up to make some of those too...:D BJ:) |
RE: JetJoe OWNERS thread
ORIGINAL: BJ64 Say... Smithy... Send Craig some detailed pics of a JJ-3000 burner - maybe he'll tool-up to make some of those too...:D BJ:) Hi BJ, To be honest, the 3000 CC looks very similar to what he has made, probably not as good as Craig's though...... the 3000 has nine (9) vaporizer tubes if that makes any difference..! Am off to the Temora Jet meet on Friday 17th, will be good to see some real skillful flying again, will be taking my "highly modified" 3000 powered afterburning jet dragster too, will be a great weekend. Cheers, Smithy. |
RE: JetJoe OWNERS thread
Mate, I would love to see and hear that Dragster of yours.
As it has panned out, I won't by up at Temora for this years meet. Hope to get the chance to see your 'firebreather' sometime :D:D BJ:) |
RE: JetJoe OWNERS thread
Well BJ,
If you can't be there, here's a little static engine run video of it on Friday at Sydney Dragway...! Enjoy..! http://www.youtube.com/watch?v=cuqgrv99jZ8 Cheers, Smithy. |
RE: JetJoe OWNERS thread
ORIGINAL: knobby1 Well BJ, If you can't be there, here's a little static engine run video of it on Friday at Sydney Dragway...! Enjoy..! http://www.youtube.com/watch?v=cuqgrv99jZ8 Cheers, Smithy. LoL She's pretty trick, mate... ;) BJ:) |
RE: JetJoe OWNERS thread
1 Attachment(s)
Hi Smithy
Thankyou and it took me a very long time,to make the necessary tooling for the combustion chambers. My Myford ML7 lathe worked hard at machining the solid steel blanks and I could almost fill a 44 gal drum with all the shavings. This combustion chamber design is the Artes JG100,which was an updated version of the original KJ-66. The measurements from the JJ1800 one,is very close to it. I came across a small problem,concerning the inner wrapper,where it fits into the NGV. The NGV was not perfectly round in shape and the inner wrapper,would not enter the bore at all. I decided to cut small slots into the end of the inner wrapper and bend the sheet inwards. It actually worked and I`ll attatch a photo of this mod. This should solve the problem with "different sized NGV`s",which JetJoe maybe have sent out? You have got more experience than what I have got,concerning the JJ1800. What do you think about moving the preload to the REAR SECTION ONLY? i.e. Re-designing the shaft tunnel,so that the spring and spacer,is on the rear end. One thing,which I see as a problem,is the hole size in the diffuser and the spacer,which is part of the compressor wheel. It would have to be smaller and be bored for the bearing O.D. The bore would then be at a depth of 2,5 mm and the bore in the shaft tunnel,would be 4,5 mm. This would hold the front bearing and the preload would be on the rear bearing. Just like the original KJ design. If you ever get a JJ3000 combustion chamber,which is "shot",let me have some dimensions and photos of it. I`ll make the tooling,as I`m sure that BJ would want one. Enjoy your trip and keep in touch. Regards Craig |
RE: JetJoe OWNERS thread
ORIGINAL: KJ-66 Hi Smithy Thankyou and it took me a very long time,to make the necessary tooling for the combustion chambers. My Myford ML7 lathe worked hard at machining the solid steel blanks and I could almost fill a 44 gal drum with all the shavings. This combustion chamber design is the Artes JG100,which was an updated version of the original KJ-66. The measurements from the JJ1800 one,is very close to it. I came across a small problem,concerning the inner wrapper,where it fits into the NGV. The NGV was not perfectly round in shape and the inner wrapper,would not enter the bore at all. I decided to cut small slots into the end of the inner wrapper and bend the sheet inwards. It actually worked and I`ll attatch a photo of this mod. This should solve the problem with ''different sized NGV`s'',which JetJoe maybe have sent out? You have got more experience than what I have got,concerning the JJ1800. What do you think about moving the preload to the REAR SECTION ONLY? i.e. Re-designing the shaft tunnel,so that the spring and spacer,is on the rear end. One thing,which I see as a problem,is the hole size in the diffuser and the spacer,which is part of the compressor wheel. It would have to be smaller and be bored for the bearing O.D. The bore would then be at a depth of 2,5 mm and the bore in the shaft tunnel,would be 4,5 mm. This would hold the front bearing and the preload would be on the rear bearing. Just like the original KJ design. If you ever get a JJ3000 combustion chamber,which is ''shot'',let me have some dimensions and photos of it. I`ll make the tooling,as I`m sure that BJ would want one. Enjoy your trip and keep in touch. Regards Craig BJ:) |
RE: JetJoe OWNERS thread
Hi BJ
I can only make the tooling,when I`ve got one of those burners in my hands. Measurements have to be taken and only then,can I make the necessary tooling and determine a cost. So I must try to get a new or used one and take it from there. Once my engine is complete,I`ll be making a model for it,because I need some "stick time" and then I`ll start making parts for spares. I measured-up the original shaft tunnel on my JJ1800 and found that the "clearances" were way out. This explains why there was not enough bearing preload and also the bore in the front bearing section,was "oversize". I`ve been thinking about using EN24 steel for the new shaft tunnel,but it would increase the weight of the engine. So I`ll try to get a good quality aircraft grade aluminium and make one. Regards Craig |
RE: JetJoe OWNERS thread
There ya go Brett :D
Surely you just happen to have an old or spare JJ-3000 burner can laying around somwhere? LoL BJ:) |
RE: JetJoe OWNERS thread
How'd Temora go, Smithy??
BJ:) |
RE: JetJoe OWNERS thread
ORIGINAL: BJ64 How'd Temora go, Smithy?? BJ:) Cheers, Smithy. |
RE: JetJoe OWNERS thread
Ur kidding me...
That's WHY ppl want to see your 'little car'.... :D BJ:) |
RE: JetJoe OWNERS thread
Craig, when you makethis wheel tunnel, think that I will need one.
I just got a JJ1800 real cheap and I will try to get it going. I do not have the tunnuel and I prefer to get it from u and not from JJ. I will take some photos and I will post to see what I got. And Ihope with the help of you guys to get it going since I have no experience. I will need the electronics and all for it. If any one hase good relaible parts that lay around, and think that I can use...let me know. JJ wants $360 for their ECU and other stuff. With 340 I can get a hornet 3. I was looking for orbit but I do not see them around. On 5 bears it was/is a DYI project, does any one try it? Thank You Adrian |
RE: JetJoe OWNERS thread
The shaft tunnel from JJ will be fine, and at $40 it is not worth making it, unless you want to make one from steel instead
You can get an ECU from http://www.xicoy.com/catalog/ |
RE: JetJoe OWNERS thread
Hello to all
Please provide me with the type of metal made him all the engine components And where you get the engine turbine manufacturing scheme Thank you for all Nour |
RE: JetJoe OWNERS thread
Hi Adrian
I`m actually getting the aluminium stock next week,so that I can make a new shaft tunnel for my engine. The tolerances in either end of the shaft tunnel,were not acceptable and the "step",where the spring stops against,was not parrallel to the front face of the shaft tunnel. So my shaft tunnel,definately needs to be replaced. I`m in the process of "rough cutting" the shaft now and it will be hardened to 40 Rockwell and then ground to specs. The rear bearing journal was 0,01mm undersize and this caused a loose fitting of the turbine wheel. This was found on the JetJoe shaft,which was in the engine. I`ll actually "freeze" the shaft,to install the rear bearing and turbine wheel. The compressor wheel will be heated-up and then installed on the shaft. I`ll be doing some private work in the Marine and Earthmoving Industry this weekend,so I doubt that I`ll have some time to finish the shafts and start on my shaft tunnel. But definately next week. Regards Craig |
RE: JetJoe OWNERS thread
Interesting thing I have been told recently, I have just rebuilt my wren54 with a new tunnel (stainless steel) NGV, compressor and turbine wheel, balanced it all myself using the rocking method and it has no vibration anywhere apart from between 90-100k.
I spoke to Mike at wren and he said it could be low preload or more than likely a loose fit of the compressor on the shaft. When I rebuilt my JJ1400 the compressor was a very tight fit, so I had noted that the compressor fit on the shaft of the wren was not as tight, it was not loose but an "easy fit". Back to the interesting thing he told me was to "paint" the shaft with a sharpie (permanent marker) I had my doubts but was amazed how it tightened up the fit of the compressor, so much so It was now difficult to get on. I have yet to run it again, but your undersize bearing journal made me think about it, as I have an old JJ shaft that I also replaced for the same reason and now trying "painting" the journal with the sharpie also gives the bearing a much tighter fit. |
RE: JetJoe OWNERS thread
That is interesting,...how about when it gets hot? hat if you use blue or red 266 High templock tight? This goes to the microscopic leveland fills up. What if you smear the shaft and wheel, the inner of the bearing...etc. Only bad thing is to take a part. You will have to heat it up for the red 266. would this work?
Adrian |
RE: JetJoe OWNERS thread
The Compressor end wont be hot, dont think it would work on the turbine wheel
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RE: JetJoe OWNERS thread
if balanced jj1400 with my new balancer machine
here the image http://img217.imageshack.us/img217/9928/staffaggio.jpg jj1400 http://img576.imageshack.us/img576/9346/hpim0161.jpg initial imbalance (original from factory) http://img337.imageshack.us/img337/521/toll2.jpg after balancing process (imbalance good to test the engine) |
RE: JetJoe OWNERS thread
Hi Chrigui,
Can you tell me if your balance calibration is mg-mm or mg-in please??, I'm using mg-in for my balancing as the result is a little better and tighter tolerance. I also use a Schenck, a CAB920 unit. Cheers, Smithy. |
RE: JetJoe OWNERS thread
hi...
i use mg-mm (i use metric standard) with good result... after i balance rotor assembly only before i check all with engine assembled to little finishing balancing |
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