RE: JetJoe OWNERS thread
 

Anyone with the same ECU as mine with a JJ-1400, can you please tell me what your parameters are at please ?

These are mine:


Parameter/Value
1 000
7 120
16 002
17 050
18 004
190 03
20 006
22 100
23 028
24 050
25 016
26 018
27 030
28 001
29 002
30 002
31 024

RE: JetJoe OWNERS thread
 

Hey Sonnich,
I noticed you had the JJ1400 for a while (I remember reading your AMD Hawk thread). Do you care to share how many hours run time you have on this engine??

I don't want to start something here so you can pm me if you like...

Thanks,
Wild (about to purchase my first turbine)...

RE: JetJoe OWNERS thread
 

There must be something wrong with your document, the parameter as far as I remember is for degrees celsius x 4, so a value of 100 would be 400 degrees celsius

RE: JetJoe OWNERS thread
 

wildnloose, mine has only run 219 minutes.

I destroyed my bearings some time ago when i accidently pinched the lube line installing the front cover.
I have not had it in a plane after replacing the bearings.



Ruizmilton , thanks.....a LONG time ago, i thought i heard someone taliking about degrees.

On gas, it reaches 400 degrees quite fast....should it shut off that quickly ?

RE: JetJoe OWNERS thread
 

What's this I hear about a JJ3600? Anyone has more info on this - when will it be available?

RE: JetJoe OWNERS thread
 

Where did you hear this ??

RE: JetJoe OWNERS thread
 

..it was from this post from myersflyers...

Brg

Dave.

RE: JetJoe OWNERS thread
 

I think he was saying "imagine" as if it was a thing he wished would happen. I don't think that he meant that he had heard it would happen. At least that is how I interpreted it.

RE: JetJoe OWNERS thread
 

..Yes 'Wishfull thinking' ,thats exacty how i read it too...

Brg

Dave.

RE: JetJoe OWNERS thread
 

Apparently Jet Joe is working on a 30lb turbine. Check the following link:

http://www.jetjoeus.com/news.htm

RE: JetJoe OWNERS thread
 

I forget to comment that the JJ pumps are copied from hausl pumps and that the latest solenoid valves (these yellow/brass ones that fail after few weeks of use) are a copy of the Parker Pneutronics ones.

Sonnich, didn't your engine come from the first UK dealer, Andy Owen, who modified it extensively including the installation of a UK made combustion chamber?


You have forget the 3th option, that is the one to advise to those who are low in budget to not trow his money down the tubes. Reccomending to a guy that is short in money to buy a something that he don't will have anything more than troubles...is a bit cruel.

My opinion is that in the future the turbines will be cheaper and better, like all the things in this world are each day. But this improvement will not come from guys like JJ who are trying to make a easy profit without investing anything, all the progress will come from companies who know his stuff and what are they doing and will invest in development in more efficient manufacturing processes and improved designs. With cheap labor only you have is something being made cheaper and worse, but not progress. From this point of view, JJ is not contributing at all, only delaying the progress.

Gaspar

RE: JetJoe OWNERS thread
 

Sonnich:

Based on my experience it seems clear the intention to continue on gas for some time while ramping is to ensure you do not get liquid fuel on the CC before the vaporizer tubes have reached enough temperature to begin the vaporizing, based on that, 400 degrees should be enough, assuming you do not have a hot start, keeping the gas on until idle is reached will just result in higher temperatures based on my experience. You will notice the gas being turned off by the ECU when while ramping, RPM's seem to decay for a second or two then continue increasing.

RE: JetJoe OWNERS thread
 

Gaspar:

Do you have any dealer in the US carrying this item?

AMTADAPT

Thanks

RE: JetJoe OWNERS thread
 

I'm sorry... I just have to ask.... Working on? :D[X(][:@]

RE: JetJoe OWNERS thread
 

Thanks for the info Ruizmilton [sm=thumbs_up.gif]

Gaspar, yes, Andy assembled my engine.
would my settings be much different from other JJ-1400 engines then ?

RE: JetJoe OWNERS thread
 

I have never 'reccomended' a JJ to anyone in particular.
I don't have any influence on anybody's choice to purchase either, people make their own mind on that, we cant stop them BUT I am merely stating that because I have owned one, as this thread is titled "JetJoe Owners". I would help those who go down that path if they so choose.
This thread is to help, share and advise those who have one.

RE: JetJoe OWNERS thread
 

I use shell turbine oil in mine

RE: JetJoe OWNERS thread
 

Smithy

WOW that may well be some kind of a record. Opened the JJ box brand new late in November and just one month later to have run it for 12 hours solid. Thats going to work out using approx 350 gallons of Jet A1 fuel a year.

Paul

RE: JetJoe OWNERS thread
 

Hey Paul,

Don't know about a record but I've been running the JJ1800 pretty long and hard over the last week or four, I work for an aviation turbine overhaul and repair company here in Sydney so procuring Jet A1 and Mobil Jet-II turbine oil isn't an issue for me, plus it's free which is a big, nay huge bonus!!

I'm trying to obtain some usefull service data to help with servicing costs and spares requirements for any future JJ service customers I might have, I do a lot of prolonged running at constant rpm's, idle, 40-50-60-70% etc.... and I even did a run of nearly 15mins at 100% (115,000rpm), to try and find a weak point while taking notes on thrust measurements, EGT changes and rpm fluctuations etc..., I have a high capacity 7.2 volt battery (4600mah) as opposed to the normal 1800mah battery supplied with the engine, so I'm able to run the engine for extended periods without the fuel pump suffering from lack of power..... so far-so good....fingers crossed!

I'm also experimenting with different types of fuels like Jet A1, plain old household kerosene, lamp oil and at the moment I'm putting a load of diesel fuel through it. With the lubricity qualities of diesel fuel, (we have pretty good quality diesel fuel here in Aus), I'm finding the fuel/oil ratio can be dropped to as little as 2-3% without any ill effects. She does blow a little bit of smoke though while running on diesel, to be expected I suppose!

I will endeavour to find the best ratio of fuel/oil % for each type of fuel to give the best service life of the bearings and combustion chamber etc...However, what I am finding though is that most engine manufacturers recommend ~5% turbine oil in the fuel and this is pretty close to the mark, they have indeed done their homework.

We must also remember that although some of the items in the engine aren't spinning at 100k+, they do still work pretty hard, thermal stress is a big cause of why some components fail, this is the sort of thing I'm looking for.

So far the only minor problem I've found is some heat stress and minor distortion of the combustion chamber close to where the flame front from the evap tubes is, nothing major but worth keeping an eye on! I'm also looking at what sort of time it takes for the fuel injectors to start blocking up with carbon deposits, I believe good quality fuels and oils along with fastidious filtering will greatly prolong the service life of the bearings, combustion chamber and fuel injection system components. I'll post my results here in the not too distant future for all JJ owners to see.

Anywho, enough of my rambling, and if we could just stick to the topic of this forum it would be good without flaming these engines or the people who choose to buy them, people come here to receive help and/or guidance with their JJ engines, or to give the same, please be kind to each other, it isn't hard to do!

Cheers and all the best from Down Under,

Smithy.

RE: JetJoe OWNERS thread
 

Hi Smithy

I guessed as much as you'd mentioned being in the turbine repair business. Usually most jet flyers might be pleased to get 90 minutes of weekend flying. This is also likely to be broken up into 8-12 minute slots, so even as I get my JetA1 free its not easy to clock up the running time. Even the guys who fly drones or run Jet training schools don't get high hours on any single turbine setup in a year. So once you have got to 36 hrs or over 2000 minutes running you might well have record, as there will not be many flyers worldwide who can match that level of usage on a single turbine.

Like the idea of experimenting on fuels etc, as in the UK we have red diesel (just dyed red) that is for farmers and carries little tax or cost (strictly illegal for use in road vehicles). So if you ever arrive on a mix, with the proportion of diesel to JetA1 to reduce smoke and the cokeing up of the CC holes and subsequent degradation of performance, that will be of great interest. You might have read my posts on doubling bearing lube flow and then halving oil content, then it seems that 5% oil content may be over kill. Just as too much oil and infrequent usage can produce flats and wear, its a balance of cooling and lubricating the rear bearing that really counts for long life. For interest I'd be very surprised if most rc service centres today didn't recommend new bearings after 12 hours running, so keep on testing.

All the best

Paul

RE: JetJoe OWNERS thread
 

If you have a MIG or Sukhoi, running on smokey diesl is just a scale bouns :D

RE: JetJoe OWNERS thread
 

Hi Sonnich

Then that dirty exhaust trail should work out scale for me[8D] as I have a Top Gun Mig 29 being refurbished in the workshop for this years flying.

Paul

RE: JetJoe OWNERS thread
 

Paul,

Do TGA have a website ? would love some info about that Mig 29.

RE: JetJoe OWNERS thread
 

Hi Lior
This was a great flying model originally using ducted fan but they have gone to the wall. Terry Holston may know more if the molds survived, try looking at http://terry_holston.tripod.com/id1.html

Paul

RE: JetJoe OWNERS thread
 

The Mig is nice. I have one that use to be flown with a wren 54 mk11. It's now equipped with a JJ1800. I have not flown it yet. I'll try to get my daughter to take pictures as I don't own a digital camera myself.