[quote]ORIGINAL: EASYTIGER
ORIGINAL: J Campbell
What JJ did you get? What SN# is it?
Can I suggest you bench run it? I, and at least one other guy, have had engines they THOUGHT were ready for flight(they started and ran) but under more continued use, problems manifested. At any rate, I am glad mine is on a test bench and not an airframe at the moment. Keep in mind mine is an early one, it may be substantially different from yours.
Got any pics of your original design?
Morning Guys
You 'blokes'
been "discussing" tech things while I've been building and some go flying. My own JJ turbines are JJ1400, (fourteen hundreds) are fairly newish at No649 came with no number on the can or a 'Jetjoe' embossed stamp but with a single exhaust. Used about 1.95 ltrs of oil obout 40 ltrs of mixed fuel.
672 is clearly stamped with the number and embossed 'Jetjoe'and has a twin exhaust cone. used about 1.25 ltrs of oil
681 is the newest clearly stamped with the number and embossed 'Jetjoe'and has the single exhaust cone. Used only 0.2 ltrs of oil.
JJ First Time Users[:-]
I always bench run every turbine, till I know it well on performance and basic operation and I have then have setup the system and ECU for it.
JJ Tyros [:-]
Degaussing for JJ newbies, might mean simply passing a strong magnet over the rpm sensor. Takes less than a second really and as I've I typed these words I could have done it dozens of times, so if it might help just try it, obviously it won't fix a dud sensor!. Some here don't use the standard Gasper unit 'exclusively' maybe they are forgetting other ECUs in use, so it can help with other ECUs.
JJ Newbies[8D]
As indicated between my 649 and 681 there are little variations, no concern there. Combustion chambers do move occasionally, so if you can see the hole has moved get something and move it back gently. If you cannot see the CC hole then options exist either get the factory to realign or get someone competent to reallign. It takes me about 25 minutes to completely strip a JJ to base components. Though realigning is usually straight forward it can be tricky when the feed pipes need to realign into the diffusser to square things up.
JJ Tyros>:]
How does the CC- Combustion Chamber movement occur? In the factory the outer cans are pre drilled maybe using a template, with an expectation that the glow plus is in a fixed position, when the CCs are made little variation occur because these are hand assembled components together with the feed pipes and rings. The CC is positioned by using a glow plug and the diffuser offered up to the feed pipes, to get these to align a small twist might be needed. This slight bending of the pipes can untwist later moving glow plug hole in the CC around. In short no big deal but there should not really be a need for twisting. Ask Joe to sort and it'll be sorted.
I'm trying here to get the thread back to helping out the users. When I have pumped 25 ltrs of oil through on JJ turbine I'll have a better view. So far in stripping down of the JJ 1400s I see little to be concerned about after some operation. So far so good I have the re purchased. Enough said, I'm off flying today and with a video camera recording I hope.
ET get this back on track, with friendly discussion by all the JJ users who should use it and support it
Paul