RE: JetJoe OWNERS thread
 

Open ya freakin eyes then! LoL. :D

Yah - as I said, it's the first Vid I've ever put together, and the cam is really only a basic 10.2m pixel stills camera that takes the odd video.

I would have loved to have been able to capture brighter, more crisp and clean close-up video - might have to hunt around for a decent camera. Mind you, by the start of the last run, it was pitch-black. The little Samsung was struggling, for sure. But it managed to get some useable footage - albeit not all that fantastic. I did manage to capture some excellent sound, but that was from about 10 feet further away - so you really would have only seen jack-sh.it. LoL But it sounded pretty awesome just the same...

BJ:)

RE: JetJoe OWNERS thread
 

Befor you go burn your money on a new camera, try filming in day light we might see something then !! hahah

RE: JetJoe OWNERS thread
 

Nah - they all look the same in the daylight really.

I particularly wanted to do a night shoot after I fired it up a while ago just on dusk - they not only sound awesome, but they look bloody awesome as well :D

That plume of fire you get when going from idle to hard full-on throttle is unfkcnblvbl. You don't see that in the daylight, nor that great exhaust-cone glow.

And I really wanted to see for myself where the 'hot-spot' developed, and how everything else generally behaved.

You should try a night-burn some time - you'll see your Turbine in a different light (no pun intended). They are impressive enough as they are in the daylight - night-time really shows them off...

Marvellous stuff :D

BJ:)

RE: JetJoe OWNERS thread
 

HAPPY NEW YEAR!!! all you JJ-ers out there...

BJ:)

RE: JetJoe OWNERS thread
 

Happy New Year to all reading this! Even those fooled by JJ. May you all be blessed in 2010!!!

RE: JetJoe OWNERS thread
 

Hey guys, I am having some starting problems with my jj1400. I believe it to be an interference problem with the RPM sensor. As soon as the starter kicks in the RPM reading goes crazy and the starter turns off again. Then theres alot of fire and sometimes rite as the engine is about to stop the starter kicks back on and it will start and run normally. I was able to get it to start good with fiew problems on the test stand by separating the RPM sensor wire as far away as possable from the others and making sure they were tightly twisted (as others have stated in this thread). Now that I have the engine mounted in my Falcon 120 the problem is back. The wires are separated as far as the inside of the fusalage will let me. Maby a ferite ring will help? Any help would be great. I want to fly this baby!

RE: JetJoe OWNERS thread
 

almost always the glow wires. twisting them and routing them and starter wires an one side and routing rpm and temp on the other usually will work if not wrap rpm and tep wiresin alluminum tape.

RE: JetJoe OWNERS thread
 

I'm with idleup1 - I had heaps of problems on my first test-bench. My RPM readings went nutso just like you described. I got a lot of advice that the RPM sensor/EGT/FADEC were faulty etc etc etc. Smithy advised me to simply twitch *every* set of wires together (except, of course, the RPM cable back to the FADEC). And my Turbine hasn't missed a beat since.

You've already had yours running on the test-bench, so it's more likely in your new set-up. The RPM sensor is really sensitive to any electrical noise - make sure it's well away from any source of interference between where it comes out from the Turbine to where it goes into the FADEC. Particularly the 'high current' leads to the starter and glow-plug (which should be twitched together), and including any leads to the the fuel pump, solenoids etc. (which should also be twitched together) - perhaps even Servo leads. In short, make sure that the RPM sensor lead is pretty much in fresh-air all the way back the FADEC. Do that, and I reckon she should come up trumps.

If not, remove the Turbine cowl and make sure that the RPM sensor hasn't worked its way loose - they run a magnet on the shaft that passes by a 'hall effect' transitor thingy, and if the little PCB that holds the electronics isn't secured, it could be a reason for your problems. But I sitll think you're picking up some stray 'noise' from somewhere.

Hope this helps,

BJ:)

RE: JetJoe OWNERS thread
 

Hi BJ64
I just spent the last week (holidays hippyyyy) Working on my two 1800 and found the old regal fadec's to give me nothing but trouble in and out of the modle. I removed my fadec's from my two fa18s (wren200xl) and with the one wire change both 1800JJ wiring harness for the warthog and the 1800 jj's burst into life with on probs. What a sound the 2 turbines make in unison
I spent 4 hours trying to find dry joints on the regal fadecs with little sucsess. So they flew to the bin very nicely. Will now hurry up and wait to purchase two new fadecs from xicoy.

swampy57

RE: JetJoe OWNERS thread
 

My Regal FADEC/s seem to work ok at the moment - albeit on the test-bench.

But I'll keep what you have said in mind should I start getting strange things happen when I finally mount the two Turbines in the Airframe. Any sign of trouble, and I might be having a look at Xicoy myself...

BJ:)

RE: JetJoe OWNERS thread
 

Hi BJ
I hope the Fadecs keep working well for you. Mine are 3 or so years old and only used a few times in my boomerang XL for in flight testing and a few bench tests.
Its a bit of a pain having to slow down on the A10. I would like to have her flying as soon as it cools down over this way

Swampy57

RE: JetJoe OWNERS thread
 

Thanks guys, The fuel pump and servo wires are not twisted. Ill correct those and try agin tomarrow.

RE: JetJoe OWNERS thread
 

The Servo wires might not be an issue - but the Fuel Pump wires could foul you up. The pump, like the Glow-Plug, can get a fairly hefty current shunted through it. Particularly when throttling-up - the Fuel Pump is the only means of changing the rate of fuel flow on a JJ (and probably a lot of other Turbines too). The more fuel the FADEC determines you need, the harder the pump drives i.e. the more current that's supplied to it. If your RPM sensor lead passes close by, it could very well be the source of your RPM 'spikes'.

Give twitching Fuel Pump wires together a go, and see if you can route the RPM sensor lead a bit away from it (assuming it's in close proximity).

I'd be interested to know if this fixes your problem :)

BJ:)

RE: JetJoe OWNERS thread
 

soupcandogs

I have a similar setup in my bobcat which is smaller version of the falcon, my rpm wire and egt wire run on the bottom left side of the fuselage and the glowplug and starter wires run above my fuel tank on the right. I have only ever twisted the glow plug wires.

I have now just wrapped the pump/glow plug wires in alum tape but have 50 flights without it before, I just decided to do it as I had everything out recently when rebuilding the turbine.

Also I knew of a similar problem A guy had with his wren, he added some suppressors (.1uf ceramic disc capacitors) to the starter motor which cured it, factory wren on board starters come with caps fitted.

RE: JetJoe OWNERS thread
 

Barry,

Do you ever stop......Didn't your mama tell you to say nothing if you have nothing nice to say? There are many happy JetJoe owners. This thread is for them to discuss the issues amongst themselves. So either say something productive and helpful or go back to RC_Freedom.

Dave

RE: JetJoe OWNERS thread
 

Seen this problem and Mark at JetJoeUSA clued me in. the Hall effect sensor board under the cowl and become fixed on a magnetic orientation. that interfers with its ability to pick up the magnet in the nut. So, take a strong magent, when the ECU is powered up and place it near the RPM sensor board and the hall effect sensor. Hold it a few seconds, and you will find the rpm now reads correctly. I spin the turbine with my fingers to confirm proper operation....or plug a battery direct to the starter motor.

give it a try,
Dave

RE: JetJoe OWNERS thread
 

Dave - he's had the Turbine running perfectly on the test bench, but now suddenly that it's in an airframe, he's getting RPM spikes.

Kinda sounds like it's picking up stray signals from something in it's new configuration - sound plausible?

I've read that the magnet for the Hall Effect transistor may need degaussing after a time - particularly when the Turbine might be subjected to strong EMF going through Customs etc (not sure how much of this is true). But do you think it would go from working perfectly to not working at all just by moving it from a test bench into a plane? Assuming, of course, it hasn't come into contact with anything that could screw the magnet up, and that nothings come adrift inside the cowling (like if the Turbine dropped onto a concrete floor etc).

Then again, stranger things have happened... LoL.

Be interesting to see if twitching the high-current Fuel Pump wires together and ensuring the RPM sensor lead was routed clear of any potential source of nasty electrical noise has made the difference...

BJ:)

RE: JetJoe OWNERS thread
 

Thanks Dave, I'll keep a note of that one for future

RE: JetJoe OWNERS thread
 

No. There are more folks every day new to all of this that need to be warned of inferior products such as JJ and XPS, BEFORE they loose their money (not after, like you). Yes, as you say there are many happy JetJoe owners. But from what I can tell, there are many more UN-happy owners!!! Somehow, you decided to leave that out!!!

RE: JetJoe OWNERS thread
 

Dave.

Yes Gents, I had to deguass my Hall effect from just sitting over winter. Planes sit here in Canada for 6 months of winter...Stuff happens when stuff sits. I just deguassed and my funny RPM readings went away.....

Dave

RE: JetJoe OWNERS thread
 

I have witnesses the need to degauss several of the name brand turbines at the flying field also. I guess the components are coming from the same place.

RE: JetJoe OWNERS thread
 

Finally got a chance to try the tips you guys suggested,except the one from dw crash. It seems alot better but the starter will spin for about 4 seconds turn off then turn back on and the engine starts good. Then I noticed a much bigger problem. When i get to about 3/4 throttle and up there is a noise comming from the engine and there is a noticable vibration. I havent had a time yet to see if the starter is turning on or what. The turbine is pretty much new and only has about 1hr of test stand run time. I have never dropped it or anything. Im trying not to freak out but its not looking good,turbine engine + vibration seems real bad. Ill email Mark from jetjoe usa where I bought it after I give it a good look over.

RE: JetJoe OWNERS thread
 

soupy
I had a similar problem and had the turbine wheel balanced in situ. Smithy whom posts here should be able to tell you whom could do for you in your part of the world. Hopfully its not a bearing

reagards
swampy57

RE: JetJoe OWNERS thread
 

Just make sure your starter motor is not too far forward(back?) in such that it is engaging on the spinner nut all the time.
I tend to set them by pulling the starter away from the nut until it stops engaging then nudge it forward until it is engaging on the spinner nut with the bendix fully extending. You will know from the sound as it tends to squeal when too far away.
A snagging starter motor can also damage your ECU as it will act as a generator when spun by the turbine and back feed into the ecu.

Dont run it again unless you identify the problem and send it back to Mark who will sort it out.

RE: JetJoe OWNERS thread
 

This doesn't make any sense at all. Soupcan had the thing running perfectly on the test bench - now that it's in an Airframe, he's having problems.

Assuming the thing hasn't been dropped, and that there's no physical 'squashing' now that it's in a plane, I can't see how the RPM magnets could just suddenly gauss up. Or the starter has magically moved so that stays engaged. I still reckon the RPM sensor is picking up stray electrical 'noise' from somewhere. Or something has worked its way loose inside the Turbine - e.g. RPM sensor board etc.

Soupie - the last run on your test bench, did it run ok? Nothing out of the ordinary happened – as small as it may seem? And did it shut-down normal? i.e. you let it go through the cool-down cycle etc etc?

And where it's mounted now in the Falcon - she's nice and steady? Engine is mounted firm and true, and nothings pressing against any of the Turbine itself? You haven't managed to jag something into the turbine blades while mounting it in the Airframe and thus bent a blade over (same goes for the compressor - but hopefully you're running an FOD there). And finally, the RPM sensor wire doesn't run close to any other leads from where it comes out of the Turbine all the way back to where it plugs into the FADEC? And all the running gear is the one you used on the test bench, yah?

As flakey a reputation as JJ's may have at times, I just can't see how a perfectly working Turbine could cark itself by simply taking it off a test bench and mounting it in a plane - unless something untoward has happened somewhere along the line. They just don't sh.it themselves that easily. If it was knocked heavily, or a kid stuck a screwdriver up the bum or down the intake, or different running gear was swapped in, then yeh, maybe. But, hells bells, undoing 4 bolts and some plugs and putting them back into place shouldn't ruin a Turbine. Not even a JetJoe.

Gotta say - you have me stumped here...[&:]

BJ:)