RE: JetJoe OWNERS thread
 

Same ECU as I am using, the back screen parameters go from 1-31 never knew about these, would be very interested also in having them.

I see a file from the last download - fadec settings.fac but dont know how to open display it.

RE: JetJoe OWNERS thread
 

Use notepad :)

RE: JetJoe OWNERS thread
 

Thanks, yes a big list of numbers, from your list I can make out what I have.

What about asking gaspar maybe he will let you have the full list.

RE: JetJoe OWNERS thread
 

Xair - just be careful which version of the OCX file you download - it's not neccessarily a case of the 'latest is the best' in your scenario.

What you will probably need to do is make sure you match the OCX file to the version of the VB run-time engine that your computer is using (assuming of course that that's what's causing your problems - interesting to note that your errors were being displayed in Spanish...) i.e. you have to make sure the the versions of both the OCX and Visual Basic you've got installed match - not everything is backwardly compatible, and you may find that the most recent OCX calls on features that don't exist in the version of VB you are running against.

Like trying to put a Holden FJ generator into a VB Commodore - they both produce power, but that's about where the similarity ends...

Hope that makes sense,

BJ:)

RE: JetJoe OWNERS thread
 

Best bet is to probably email Gaspar

RE: JetJoe OWNERS thread
 

Now I have bought a s/h Boomerang with a wren 54, I have decided to strip the JJ1400 now I have something else to keep me flying.

It is running ok, but I wanted to refit it into my AMD hawk so now that I have it out of the bobcat I thought I would have a look inside and fit a new set of bearings.
One thing I have always known about these turbines, they are not a Wren or Jetcat and components will not last as long and I will be quite happy to strip it every 10 hrs and change what is needed to keep it running.

I am also curious as to what is inside and to know how to go about changing a set of bearings, not been able to find out much online other than a youtube video, so I thought I will stick my progress on here.

RE: JetJoe OWNERS thread
 

The jetjoe (if balanced) should run at least 25 hours on a set of bearings :) I have made 39 flight with the 1400 and it is still running perfect. Bearings are cool and look like new. They should last for a lot more flights :)

I am still running the 2 piece cone at 167k. Runs absolutely great.....

RE: JetJoe OWNERS thread
 

Have it stripped now and Front bearing is definatly rough back bearing looks and feels very good.

Will post pics later

RE: JetJoe OWNERS thread
 

Cant seem to get the pictures uploaded without them showing fullsize,

RE: JetJoe OWNERS thread
 

Front bearing rough? Maybe the compressor needs balancing...

RE: JetJoe OWNERS thread
 

Yes I think I will send it off to get balanced as I want to change the rear bearing as well.

Cant seem to get the pictures uploaded as before as thumbnails and a real pain fullsize with three or four pics so, I have done my strip down report in the jetjoe thread on RC Groups instead.

RE: JetJoe OWNERS thread
 

...and gratefully accepted there too... BJ:)

RE: JetJoe OWNERS thread
 

Say Xair... haven't given up on you. Still trying to re-install Win98 and a spare HDD I've got here. But it refuses to format.

Gimme time - I'll suss it out..

BJ:)

RE: JetJoe OWNERS thread
 

Spare HD? Win98? Vmware ;)

RE: JetJoe OWNERS thread
 

Much appreciated

RE: JetJoe OWNERS thread
 

Been having problems posting pictures, so this is a trial.

My fuel ring

RE: JetJoe OWNERS thread
 

Seemed to be ok now, shall I post my break down pics of the JJ1400 or is everybody also monitoring the JJ thread on RCGroups

RE: JetJoe OWNERS thread
 

vmware?

RE: JetJoe OWNERS thread
 

Yes vmware ;) If you need a test setup pc you don't repair an old pc but you install vmware and create a virtual PC :)

Please post the pic's here also, i don't read rcgroups.

Btw, my JJ1400 has made 43 flight sofar and is running very smooth. The NGV clearance is now perfect and it starts and runs like any other expensive motor. Power is enough to get a 8500g jet in the air from a small grass field. Top speed is about 200 km/h

RE: JetJoe OWNERS thread
 

Ok These are the pics and details of my strip down of the JJ1400
I cant say what the serial number is as my turbine was supplied from ModelJets in Australia as a MJ1400 and no serial numbers where on the case. At the time I never knew of JetJoe or that it was in fact the same turbine just rebadged !!

It has been running very well for the past two years in my bobcat, but I thought I would have a look inside and fit a new set of bearings.
I am also curious to learn more about turbines in general and how to go about changing a set of bearings.

First I removed the starter housing, then the fuel and gas fittings.
Next you need to remove the glow plug, tailcone and screws securing the case to the front cover.

Important to mark everything as you go, so you know waht way around etc things fit when you put it back together.

Pic 1 shows Starter housing removed, fuel and gas fittings, note also restrictor in the bearing lubrication line
Pic 2 8mm thin OS engine spanner used to remove festo fittings
pic 3 Outer case removed showing diffusor at the front (left) combustion chamber in the middle and NGV at the rear

RE: JetJoe OWNERS thread
 

Next removing the front spinner nut. Beofre you do this, if you want to be able to re-assemble without balancing you will need to mark the postion of the compressor on the shaft. You do this after the nut has been rmoved.

The nut is 12mm and has a left hand thread. The serated/splined nut on the turbine wheel at the back is 8mm. The spinner nut should loosen easily enough. Note again left hand thread on aluminium spinner nut.

When you have the nut removed mark the threads and the compressor with a felt tip before with drawing the turbine wheel and shaft, so you will know how to put it back together. I had to give the end of the shaft a slight tap to free it from the compressor.

The NGV then simply pulls out of the end of the combustion chamber and the ends of the fuel and gas pipes can be pushed out of the diffusor.
Unscrew the front cover to release the compressor wheel and spacer, Note the spacer and its orientation, I did, but now have my doubts as other pics I have seen, show it the other way around will have to confirm this before I re assemble.

Pic 1 Turbine wheel and shaft removed, also shown is rear bearing on shaft behind turbine wheel
Pic 2 Combustion chamber seperated from NGV and Diffusor/shaft tunnel
Pic 3 Front cover seperated from diffusor releasing compressor wheel and spacer.

RE: JetJoe OWNERS thread
 

With the front cover removed you can now remove the plate and screws holding on the shaft tunnel. When the plate is removed the lubrication pipe is visable, on mine it dosnt quite reach the bearing but maybe this is normal.

Before taking the bearing out of the shaft tunnel, look at the rear bearing on the shaft and note the arrow marked on it, this is the for correct orientation for the preload, check which way the front bearing is as you take it out.

I carefully pushed the bearing out from the other end of the shaft tunnel with a piece of dowel, Remove also the preload spacer and spring.

Pic 1 shows lubrication tube and front bearing in the middle of the diffusor.
Pic 2 shaft tunnel removed from diffusor
Pic 3 Bearing and preload spacer and spring removed from shaft tunnel

RE: JetJoe OWNERS thread
 

Pic below shows a layout of all the main bits, at this stage it is fairly streight forward to put it back together again especially if everything has been marked to aid assembly.

I also want to check the fuel needles so I removed the fuel and gas rings from the combustion chamber.
To do this first mark it all so you know how to put it back together, then the metal tabs have to be bent up to allow the pipes be removed.

I then hooked up my gas can and lit the needles (like a birthday cake ) You should have a similar flame out of each.
As can be seen on mine some are good some poor and two not lit at all.
This could also be seen by looking into the combustion chamber, the ones not lit the vapour tubes are like new, they may have been blocked from the start or at least early on, and may have been a contributor to the reduced thrust I had when I first ran the turbine, before fitting the single tail cone.

RE: JetJoe OWNERS thread
 

If you put the fuel line in again you might want to bent the needles in a position so that they point all inwards. The way they are now is very hard to mount corectly. You need to twist the fuel line and make sure alle needles are perfect an then you have to secure the fuel ring. Most of the times it won't stay put and the needles push it in a different postion. If you fit needles while pointing inwards the rotation of the fuel line won't influence the vaporizing quality.

Try cleaning the needles by heating them and pressurising the fuel line.

RE: JetJoe OWNERS thread
 

First job was to get the fuel needles working, after a lot of blowing and trying to push wire into the needles I managed to get them all working.
I Found a strand of a piece of multi stranded wire (bowdan cable) worked best as it was small but ridgid to push into the needles.
At first I thought I was'nt going to get them sorted until I realised that some of the needles were protruding into the collector ring too far and bottoming out, blocking the end, so I gently squeezed the collector ring tube with a pair of pliers, which worked great.
I think there were probably a couple of blocked needles from new, and explained the reduced thrust.

I also checked the three gas needles and the lube tube the same way and they were ok.

The NGV has some casting flashings on the stator blades, had thought about grinding them out but from advise of others I think I will leave alone for fear of maybe creating a stress point, going to order up a new one anyway and polish it up from the start.