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JetJoe OWNERS thread

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JetJoe OWNERS thread

Old 06-20-2017, 01:13 AM
  #3626  
Ian_A
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One problem I have is that my old HDT gave up many years ago. I bought a new style white one but the plug didn't match. I failed and it's been years since I looked at it. Long story short ..... I'm screwed, can't recall what wire went where and I still need to solder the old wires to the new pads. Have to admit I hadn't taken to white box to pieces as it was still under warranty at the time however, like I say that was years ago.
The new box PCB looks the same as the old PCB so can anyone send me a PC of your old black HDT PCB so I can identify the wires or better still has anyone already done this or can help ?

ive email Gaspar too, trusting he can throw some light on it.

pic attached

chees

ian
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Old 07-06-2017, 03:45 AM
  #3627  
Daz990
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(Sorry not a reply to your post Ian but there doesn't seen to be a way to start a new post)

I have bought a new turbine for my 1400 which is thankfully less wonky than the last but now I don't know the new orientation on the shaft. It is advertised on the JJ website as a "turbine wheel (balanced)", does this mean that the orientation of the turbine on the shaft no longer matters?
The turbine has been through the balancing process as grinding is clearly visible on the ring.

Thanks a lot,
Dariusz.
Old 07-06-2017, 03:57 AM
  #3628  
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ogni volta che il rotore disassembly e rimontaggio che è necessario per riequilibrare nuovamente m
anche se si adatta compressore, turbina e l'albero nella stessa posizione
(anche se il motore è precedente dinamico bilanciato)

Christian
Old 07-06-2017, 03:58 AM
  #3629  
chrigui
 
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each time you disassembly rotor and reassembly it you must to re-balance it again
also if you fit compressor, turbine wheel and shaft in the same position
(also if engine is previous dynamic balanced)

Christian
Old 07-06-2017, 03:58 AM
  #3630  
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each time you disassembly rotor and reassembly , you must to re-balance it again
also if you fit compressor, turbine wheel and shaft in the same position
(also if engine is previous dynamic balanced)

Christian
Old 07-06-2017, 04:33 AM
  #3631  
Daz990
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Hi Christian,
Thank you very much for your reply. Does this therefore mean that I will need to more grinding to the wheel in order to balance it relative to its new orientation on the shaft?

Many thanks,
Dariusz.
Old 07-06-2017, 04:36 AM
  #3632  
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Not grind shaft...but on compressor and turbine wheel assembled
as my machine photo
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Last edited by chrigui; 07-06-2017 at 04:38 AM.
Old 07-06-2017, 05:07 AM
  #3633  
Daz990
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I understand. Wow looks like an expensive bit of kit. I know JetJoe sell a turbine balancer on their website but I might just stick with Xairflyer's "rocking method" as it costs about £270.
Just out of interest, do those screenshots show the magnitude and location of the unbalance on the compressor and turbine wheels? I'm guessing it uses piezoelectric film sensors to sense the vibration.

Thanks,
Dariusz.
Old 07-06-2017, 05:19 AM
  #3634  
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i's used machined... i have decided to buy it because i wasn't satisfied about several balancing methods

i can balance your motor if needed

Last edited by chrigui; 07-06-2017 at 05:23 AM.
Old 07-06-2017, 05:28 AM
  #3635  
Daz990
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Interesting, thanks very much for your offer, that is very kind but I'll try doing it myself first and might send it to JetJoe UK if I have no success.

Thanks very much,
Dariusz.
Old 07-28-2017, 08:10 AM
  #3636  
Daz990
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Hi all,

I've just reassembled my engine after lots of balancing. The compressor and turbine are now balanced to about 6-7mg according to the DynexHobby Impulse kit which I think is about as good as I'm going to get it.
Having slotting in the shaft with the turbine and compressor, the whole assembly feels less free than it did in the balancing setup. There is nothing scraping against the housing, the only noise is the usual rolling of the bearings.

Is it just the effect of the preload that causes the bearings to spin less free?

Thanks,
Dariusz.
Old 07-28-2017, 11:28 AM
  #3637  
Xairflyer
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Yes when you push on the compressor nut it tends to spin free'er (if thats a word)

How do you find the Dynex balancer I am tempted to buy one
Old 07-28-2017, 02:49 PM
  #3638  
Daz990
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Ah ok thanks.

The Impulse Balancer is a really great bit of kit but does require some effort to setup properly to get good results:

I would go so far as to say that you must build the pendulum suspended test rig featured in the tutorial video as this works much better than any other design.
You will need to fiddle around a bit with the filtering frequencies to get results that are not affected by background noise, which is quite straightforward to do with the software.
If you experience the needles on the gauges jumping around a lot, the averaging feature helps get rid of the erroneous results. I found this particularly the case with the phase meter so I set averaging from 5 to 45.

I selected the 2 plane balancing feature which is quicker than the clock method but probably not as accurate.
Also, the final sum came to about £200 with shipping and DHL import tax (I bought the Impulse module, an IR sensor and an exra accelerometer).

The imbalance of the new turbine wheel was reduced from 0.1g (after the rocking method) to 0.007g after using the Dynex Impulse.
I would have gone further but I reasoned that any slight offset in the orientation upon engine assembly (which is quite likely) would probably not make it worth it.

Hope this helps,
Dariusz.
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Old 07-28-2017, 02:52 PM
  #3639  
Daz990
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Also note that the two polarcharts produced do not take into account the magnitude of the off-balance, only its location.
Old 08-16-2017, 08:32 AM
  #3640  
Daz990
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Hi again,

Bad news, having completed checked purged all the fuel lines, replaced the FESTO fittings on the front, I'm still experiencing fuel leakage from the the fuel fitting on fuel ramp during startup.

I'm beginning to think it's my ECU which is causing it. I'm using an old Wren Digitech unit (pictured) and I think the fuel ramp is simply too powerful for the engine.

Anyone heard of these being problematic?

I've got it set to:

PUMP START AUTO+1
PUMP START RAMP 002

Also not sure if it's worth mentioning but I am using the lesser seen type A brass fittings that protrude straight out of the front of the starter housing.

Any of your thoughts would be greatly appreciated.
Thanks,
Dariusz.


Old 08-16-2017, 12:43 PM
  #3641  
Xairflyer
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Its not going to have anything to do with ecu, its simply a fitting or pipe problem, make sure your pipes are cut square and clean not simply cut off with a pair of snips or side cutters
Old 08-16-2017, 01:32 PM
  #3642  
Daz990
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Thanks Xairflyer, it seems to be crucial to get the FESTO tubing to be cut straight.

I haven't been getting hot starts either so I wouldn't make much sense if it was ECU related also saves my wallet from taking another pounding.

I found this thread with someone explaining a similar problem with his Wren, seems like it sorted itself out for him (https://www.helifreak.com/showthread.php?t=715173).

Thanks for your help!
Dariusz.

Last edited by Daz990; 08-16-2017 at 02:05 PM.
Old 12-21-2017, 01:39 PM
  #3643  
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Hey guys I bought a beat up jj1400 online that im going to try and bring back from the dead. Is there anybody in the USA selling parts? Its looking like I might have to get them from china. I also have a another jj 1400 in a Falcon 120 the needs bearings I think. It makes a howling noise at full throttle and you can feel a slight vibration while holding on to the fuselage.
Old 12-21-2017, 04:12 PM
  #3644  
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Contact Crx turbines.
Old 02-13-2018, 07:26 AM
  #3645  
edwarda10pilot
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Originally Posted by soupcandogs
Hey guys I bought a beat up jj1400 online that im going to try and bring back from the dead. Is there anybody in the USA selling parts? Its looking like I might have to get them from china. I also have a another jj 1400 in a Falcon 120 the needs bearings I think. It makes a howling noise at full throttle and you can feel a slight vibration while holding on to the fuselage.
Yes, as juanjulian said, contact Andy at CRX Turbines. I got mine from him and he has done repairs and bearing changes on the JJ units and many other brands.
www.crxturbines.com . You can also contact him at : [email protected]

Ed
Old 02-14-2018, 01:47 PM
  #3646  
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Aandy at CRX no longer service JetJoe.
I also bought a used jj1400 and plan to rebuild as xflier did and balance with dynex impulse balancer.
Juan
Old 02-15-2018, 11:43 PM
  #3647  
i3dm
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Originally Posted by Ian_A
One problem I have is that my old HDT gave up many years ago. I bought a new style white one but the plug didn't match. I failed and it's been years since I looked at it. Long story short ..... I'm screwed, can't recall what wire went where and I still need to solder the old wires to the new pads. Have to admit I hadn't taken to white box to pieces as it was still under warranty at the time however, like I say that was years ago.
The new box PCB looks the same as the old PCB so can anyone send me a PC of your old black HDT PCB so I can identify the wires or better still has anyone already done this or can help ?

ive email Gaspar too, trusting he can throw some light on it.

pic attached

chees

ian

email me at [email protected]
i hope i can help identifying the wires.
Old 02-21-2018, 11:17 AM
  #3648  
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Unhappy JetJoe Jj1800 not getting above 75000 rpm

Hello All JJ owners,

I need your help with the JJ1800 turbine which I recently bought.
When i tried running it with all batteries charged (Starter and fuel pump battery LiPo 2s 2200mah), the engine won't go above ~75000rpm with pump Pw on first screen of data terminal reaching 1005 units.

I checked all the fuel lines for blockages etc.and found nothing.

Has anybody had this problem before.

Thanks.
Madpatty
Old 02-21-2018, 11:29 AM
  #3649  
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What ECU do you have? If the PW is at 1000 plus it sounds like something is not right. Perhaps try another pump. The JJ ecu does not allow you to change the pw limit where as other ecus do. You also might want to try another pump just to rule things out. How does the engine run at 75K. rich, clean, flames? This is ~70% % of max.

Andy

Originally Posted by Madpatty
Hello All JJ owners,

I need your help with the JJ1800 turbine which I recently bought.
When i tried running it with all batteries charged (Starter and fuel pump battery LiPo 2s 2200mah), the engine won't go above ~75000rpm with pump Pw on first screen of data terminal reaching 1005 units.

I checked all the fuel lines for blockages etc.and found nothing.

Has anybody had this problem before.

Thanks.
Madpatty
Old 02-21-2018, 11:36 AM
  #3650  
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Hello Andy,

The ECU is a Regal Electronics unit.
The engine was running nice at that rpm. No flames etc.

I yesterday checked the flow out of fuel pump (by bypassing the fuel filter) and flow came out to be exactly same.

Fuel pump was energized using the fuel prime function.

Thanks.

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