RE: JetJoe OWNERS thread
 

Hi,

You can check the potential flow of fluid by connecting a gas supply (propane) to both the fuel ring and lubrication line via a "y" festo while the turbine is disassembled. Just turn on the gas and light all of the fuel injector needles and lubrication line with a simple match. Now you will be able to visually see the "percentage" of flow that the fuel ring has compared to the lubrication line. (This also allows you to clearly see if any injectors are blocked) As far as the restrictor, I carefully and slowly crimped the tip of the lubrication line with pliers until the flow ratio between the fuel ring and lubrication line was right. I think I crimped the lubrication line down to the point where the flame from the lubrication line was three times bigger than any ONE of the fuel injectors on the fuel ring.

Hope this helps some,
Brandon

By the way, mine runs great, and is also powering a stingray.

RE: JetJoe OWNERS thread
 

lub line 3 times bigger, thanks for that, much appreciated.
Regards
Nick.

RE: JetJoe OWNERS thread
 

Lubrication Problem

Hi,

First I tried to calibrate lubrication using gas as described by jsf125, but did not works right for me so I tried something different, I connected the fuel ring and lub line with a festo Y and I connected to the pump so then I made the fuel run trough the pipes and live the fuel drop in different containers (plastic bottle) after that I measure how much fuel pass trough the fuel ring and the lub line, that it;)

What I have founded is that the old kind JJ lub line build in restrictor (the one with a needle) gives 10%, new kind that is smashed and not very accurate gives 25%( at least my one and I think is too much) so I tried two different restrictor that I made with hypodermic needle inserted in a brass pipe, one is 0.6mm by 20mm long and the second is 0.8mm by 20mm log, I have attached this restrictor outside turbine so I could change them without disassemble the engine. So I tested the restrictors and the 0.6 one give me 13% for Lubrication and the 0.8 gives me 16% so I run the engine with the bigger restrictor for more lub and popping and flames disappears.

I hope my explanation is easy to understand:D

I will post pictures from restrictor when I return home

RE: JetJoe OWNERS thread
 

Hi.
here is an OT question that i am unable to answer yet so i need some opinions.
It occured to me that most JJ owners should be very knowledgeable by now with all that tinkering that is needed.
I know that the JJ costed me a lot since it didn't work out for me, but at least i learned a lot from it.
As a previous JetJoe owner and a happy Trefz TT66 (KJ66) present owner i noticed that contrary to what i know so far the EGT
of my kj66 increases with rpm. When i had the JJ1400, i was told that Egt should fall with an increase of rpm.
It would go from say 640 C at idle to 570C at full throttle. Many Wren 54 owners also said the same thing.
My kj66 goes from 540C at idle to 660C at full throttle with a very healthy burn and this time i have been told that this is the way
a good turbine should behave.
I guess that a higher power output should increase the EGT but why the JJ or the Wren54 show the opposite?
If someone can guide me to what is normal and why, i would be glad to hear his/her opinion since i simply do not have much experience with turbines.
Also i would like to ask you all if adding an automotive injector cleaning fluid to the turbine fuel would help keep the injection needles cleaner. I guess that a touch of it in the fuel will not harm the engine.
I have read that some people do it but i have not enough data on it in order to try it my self.
Needless to say that my present turbine works like a dream, it accelerates fully in 3 seconds and doesn't flame out no matter what i try.
Just for comparison the Acceleration delay of the Fadec is set to 001 and Deceleration delay to 005.
The construction tolerances are just unbelievable having in mind that i can only compare it with the JJ1400 i had.
I also took a night video just to check temperatures using the color of the exhaust nozzle so if someone want to see it i can try and post it
(it is 7mb in 3gp format)
Thank you for your patience with me.
Chris

RE: JetJoe OWNERS thread
 

Hi Chris,

Post the vid on

http://youtube.com/

Then copy your link onto this thread. I'll down load on to my PC running data for a KJ66, Behotec JP66 and JG100 which are all very similar to our Trefz 66 turbines. I have operational readings for a MW44 and MW54, so I'll post them for info soon.

cheers
Paul
RCdriver

RE: JetJoe OWNERS thread
 

Hi Paul
I am on to it.:D
Any data will help as this is only my second turbine.
Chris

RE: JetJoe OWNERS thread
 

here is the link: http://www.youtube.com/watch?v=zWKns3cbn2E

Just some remarks now.
This is the second night run and it only took ~10 seconds to reach idle so it took us by surprise.
There are some hot spots visible at full throttle (123 Krpm) but i dont know if they actualy are hot spots or something normal.
I know that usualy hot spots are visible at idle but those are visible only at full throttle and the peculiar thing is that they spread
evenly with 90 degrees separation. Temperature at full throttle is 662C and at idle only 540C.
It runs very calm and absolutely no vibrations are felt.
If you watch closely you will see that i move the throttle stick of my Tx to the full throttle position instantly and the acceleration delay of the fadec is set to 001!!! It can't get any lower than this:D
At the end the fuel was almost non existent so i raised the rpm to 60Krpm and shut off the engine.
I now raise the engine rpm to half throttle, leave it there for 5 seconds and then shut off the engine.
It helps cool the engine it seems but i actualy follow the manual.
I am waiting for your comments!
Chris

Below is a picture of the tt66 on the test stand. I use 3 inline fuel filters, one gas filter, one more lubrication filter along with the external restrictor and one gas check valve just before the turbine gas inlet.

RE: JetJoe OWNERS thread
 

I am looking for a turbine for my Byron BD-5j I was thinking of a KJ66 but at this price it is hard to turn down. Would you guys put a 1200 or the 1400 in it.It is probably a 16 pound plane.Thanks in advance,Hacksaw

RE: JetJoe OWNERS thread
 

Get a Wren 54 kit turbine. You'll have a quality turbine that will fly your model many hours for not much more than this Chinese junk.

Dave

RE: JetJoe OWNERS thread
 

how much are they?

RE: JetJoe OWNERS thread
 

http://www.altecare.com/wrenturbines.htm

RE: JetJoe OWNERS thread
 

Hi Hacksaw

Good advice given above which I second, go for a Wren SS MW54 at 18lbs thrust you'll have a superb flying model. With a JetJunk 1400 giving just over 12 lbs you'll be looking for more power. If like Chris above and I, we found a good reliable and cheap turbine in a Trefz TT66 see

Sandors specials
http://www.digitech-turbines.com/shop/enter.html
or

http://www.t-turbines.de/html/komplettset.html

Remember Carlos in the US can service and fix any KJ66 type, why? they are basically all the same. lastly the JJ1800 is an unknown with only reps giving positives and until a lot more jet jockeys validate it, stay away if you value your flying time.

Paul

RE: JetJoe OWNERS thread
 

Hi.
I agree with all recomendations given to you but if you are low on budget ask Sandor (digitech turbines)
if he still has a used Trefz tt66. They go for 1000 Euros with everything included and the performance and reliability is as good as any turbine.
After all a KJ66 type turbine can be repaired quickly and easily with all those parts available.
Chris

RE: JetJoe OWNERS thread
 

For what it's worth, my first turbine was a KIT WREN 54 mk III full autostart that has operated flawlessly now for 20+ flights (see my models geh3) I'm using castrol TT oil @ 3% and have had no problems so far. I liked this engine so much I have a SS ready to go into a C-ARF FLASH. It is nice to get any type of engine and have it perform as advertised and when you get to the field, you can fly with confidence.. I am sure that later versions of the JJ will be fine , I will just stick with what works for me at this time

RE: JetJoe OWNERS thread
 

I got my JJ1400 Wednesday, unpackaged it, and mounted it on a test stand (took all of about 35 min. to mount engine and components). I purchased a $5 shelf from Home Depot and secured the vertical mounts from the bottom, screwed the engine down, and used velcro to secure the remaining items. Gabe Brown of JetJoeUS.com took the time to create a 21 page users manual in layman's terms which assisted in aligning my transmitter with the Regal Electronics ECU, general placement of the accessories, and defining all components.

I went by HKY, Hickory Regional Airport, on Thursday to purchase my turbine oil, and Jet-A fuel. I took everything out to my flying field today, screwed the test stand down on an airplane stand, put a new McCoy MC-9 in the turbine, turned on my transmitter, plugged in the accessories battery and receiver battery, advanced the throttle to 100% and then back to idle.

The JJ1400 performed without ANY flaws or hickups! As soon as the monitor's display said "Running," I advanced the throttle and watched the rpms go to 160,700. I played with it for exactly 358 seconds. Ran it a second time an hour later and then again another hour and 1/2 later. To say the least.....I am hooked!

Gabe Brown set all the parameters up on the ECU and test ran the turbine before shipping it to me. It had 5 cycles and 25 min. total time when it arrived at my house on Wednesday. I cannot say Thank you enough to Gabe for making my first turbine experience a complete blast (literally and figuratively).

Sincerely,

Greg Hames
(I should have video by the end of the weekend)

RE: JetJoe OWNERS thread
 

62 minutes after today's cycles.

Engine is running great! I haven't had to replace the McCoy MC-9 either (7 cycles and counting).

Greg Hames

RE: JetJoe OWNERS thread
 

http://www.youtube.com/watch?v=kc8O529RtDc

http://www.youtube.com/watch?v=kET2Cn5Hlp8

http://www.youtube.com/watch?v=YTGiqtueq_Y

Links to my startup, running, and shutdown video.

Greg Hames

RE: JetJoe OWNERS thread
 

I just got a JJ1400 from China as well, just had to try it considering the price. i got just the engine and running accesories, and got a TCU unit from GB Hobby (Thanks Bruce!), and a 200B pump from FlightWorks (Thanks Nadim!).

After setting up the recommended parameters from GB hobby, turbine started right up on the first try and ran perfect, no hick ups or cauging what so ever. temp at full was around 620C degress, which is more than perfectly normal. I am definitely hooked !


PREACHHAMES , Please be aware that FlightWorks recommends a 20-40 Micron filter BEFORE the pump as well. i dont see one in your setup.

RE: JetJoe OWNERS thread
 

Hello I3DM,

Glad to hear of your success!!!

I use several good filters before the fuel goes into the tank. That way I don't need a onboard filter. Sometimes it is difficult to reach a filter inside a fuesalage. That is why I filter as I fill the tank.

DW_Crash

RE: JetJoe OWNERS thread
 

I3DM,

I use a felt filter in the fuel tank as well as my 5 gallon Jet A storage tank.

Is this good? It is a Walbro solid felt filter as used in r/c gas engines.

Thanks for the help,

Greg Hames

RE: JetJoe OWNERS thread
 

Hi.
Glad to hear that you have good luck with the JJ1400.
You didn't mention about the EGT at idle and at full throttle so i can compare your readings with mine.
About the filters now.
Always use AT LEAST one filter after the fuel pump and one more at the lubrication line, the one that connects the fuel line to the lubrication inlet.
One filter at the tank is not enough and you will probably block the fuel needles and the lubrication line.
Here is why:
1) The tank filter is not that good on it's own and it will probably start disintegrating after some time, sending fibers or junk to the fuel pump.
2) The pump creates small metalic fragments as the pump gears rub each other and that tiny parts will find their way in to the engine without a filter.
Always use good filters like the festo filters or the Hangar 9.
Chris

RE: JetJoe OWNERS thread
 

Chris,

Thanks for all the good information. I do have another video with all the temperatures in view. Around 650-675 degrees celcius at full throttle and 550-600 at idle.

This engine has certianly been impressive and reliable for the past 75 minutes of running.

http://www.youtube.com/watch?v=17DIcGW7zxU

Greg Hames

RE: JetJoe OWNERS thread
 

Hi.
It looks alright congatulations!!!
One more thing about the filters.
The smaller the turbine the smaller are the fuel injection needles and the lubrication line.
In a big turbine the needles and the lubrication line have a much larger id so it is more difficult to block.
If you could see how thin are the fuel injection needles and the lubrication line in the JJ1400 you would run immediately
to the LHS to buy some good filters.
Chris

RE: JetJoe OWNERS thread
 

Guys,

Here are the running videos, all the vids that start with JJ on this page:

http://www.liorzahavi.com/videos/other/

Today's videos are numbers 2 through 5.

RE: JetJoe OWNERS thread
 

91 minutes and counting..........:)

Greg Hames