JetJoe OWNERS thread
01-31-2006 | 05:41 AM
#301
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From: Newcastle, UNITED KINGDOM
RE: JetJoe OWNERS thread
ORIGINAL: TREADSTONE22
Tar Baby..
...500, 2380, MBJII are all something like 97% the same, its only the manufacturers base oil addative package that diferentiates them slightly.....by the time we've diluted them down further...well, the difference is'nt even worth typing about... Personally, having spent several years in the oil reaserch buisiness i wouldnt really use the Steam Turbine or 2 stroke oils which have totally different lubrication properties completley...just my threepennybits worf...]
Tar Baby..
...500, 2380, MBJII are all something like 97% the same, its only the manufacturers base oil addative package that diferentiates them slightly.....by the time we've diluted them down further...well, the difference is'nt even worth typing about... Personally, having spent several years in the oil reaserch buisiness i wouldnt really use the Steam Turbine or 2 stroke oils which have totally different lubrication properties completley...just my threepennybits worf...]
Turbine Oil
Tried to bring Treadstones opinions into one complete authoritative statement for JJ owners. Treadstones advice goes directly against two Regional Oil Sales Managers and their own company oil data sheets. If he'd care to give his office tel number one manager will get his National Technical Sales Director to call.
Like to see his published "reaserch buisiness" papers then I could "diferentiates" them "completley" from the leading Health and Safety statements
.http://www.rcuniverse.com/forum/post...392&toStyle=tm
01-31-2006 | 07:17 AM
#302
RE: JetJoe OWNERS thread
As for the twin cone vs the single can I just take off the inner cone off the turbine or do I need a new tail set up from JJ.
01-31-2006 | 09:08 AM
#304
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RE: JetJoe OWNERS thread
ORIGINAL: Paul DF jet man
i will post pics and video when i get my jet back from the paint shop in 2 weeks so please have some patients. [
]
i will post results about thrust WHEN i have the turbine installed in the JET and i can put it on scales.
My jet is a trim aircraft Spectra and it did!!!! 311km at Tamora (melbourn Australia in 2003) at a jet event clocked by a guy on the ground with a radar gun during a dive. as for the 5lb comment when a DF jet is flying it looses a lot of thrust as the airspeed of the jet cancels out most of the e-flux / thrust once at speed. That’s the flaw when it comes to DF. As for turbines the E-Flux is MUCH higher so I will have far more (FLYING) power and thrust to use as apposed to the DF.
As for the twin cone vs the single can I just take off the inner cone off the turbine or do I need a new tail set up from JJ.
I agree a 14 lb turbine should be a 14 lb turbine but hey if you that worried about it and its fact that the jj 1400 only puts out about 11 lb MAX then go and spend the extra $$$ and buy jet cat.
Maby jj’s new 18 lb turbine will give us the desired 14lb we wanted ?
i will post pics and video when i get my jet back from the paint shop in 2 weeks so please have some patients. [
]i will post results about thrust WHEN i have the turbine installed in the JET and i can put it on scales.
My jet is a trim aircraft Spectra and it did!!!! 311km at Tamora (melbourn Australia in 2003) at a jet event clocked by a guy on the ground with a radar gun during a dive. as for the 5lb comment when a DF jet is flying it looses a lot of thrust as the airspeed of the jet cancels out most of the e-flux / thrust once at speed. That’s the flaw when it comes to DF. As for turbines the E-Flux is MUCH higher so I will have far more (FLYING) power and thrust to use as apposed to the DF.
As for the twin cone vs the single can I just take off the inner cone off the turbine or do I need a new tail set up from JJ.
I agree a 14 lb turbine should be a 14 lb turbine but hey if you that worried about it and its fact that the jj 1400 only puts out about 11 lb MAX then go and spend the extra $$$ and buy jet cat.
Maby jj’s new 18 lb turbine will give us the desired 14lb we wanted ?
01-31-2006 | 08:45 PM
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From: AdeiladeSouth Australia, AUSTRALIA
RE: JetJoe OWNERS thread
ORIGINAL: causeitflies-RCU
If you just take the inner cone off, the exhaust nozzle area will be too large. That's why the single piece cone is longer than the two piece, so it can taper down. The exit area should be ~ the same. The area of the two piece cone is equal to the outer area minus the inner cone area. If you can match this to the single cone area the thrust should be close or better with the two piece cone as it is more efficient. The reason the one piece cone has a deeper rumbling noise is because of more turbulence in the efflux. But, if they are matched and have the same exhaust temps, go with the one that works best or the one that sounds best
As for the twin cone vs the single can I just take off the inner cone off the turbine or do I need a new tail set up from JJ.
thanks for the information.
i think i will just leave it as is for the moment i might change it around later on to see what happens.
01-31-2006 | 09:05 PM
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RE: JetJoe OWNERS thread
Ya know, I tried to integrate a thrust measurement onto my test stand a few years ago using the drawer slide arrangement. It did not work worth squat. There was so much hysteresis in the measurement that it was basically useless. It was a real cheap mechanical fishing scale though.
01-31-2006 | 09:19 PM
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RE: JetJoe OWNERS thread
I had no problem with it, but the cheapo Zebco DeLiar fishing scale don't cut it, wildly inaccurate. I got a $30 digital one from Gander Mountain, works just fine. Batteries run out really fast, takes an odd battery, otherwise, it works fine, even with tiny Kamdax ICDF units measuring only 14 ounces of thrust. I used ball bearing drawer slides, though.
02-01-2006 | 05:33 PM
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From: Pendle HillNSW, AUSTRALIA
RE: JetJoe OWNERS thread
G'Day Mate,
Any chance of a photo of your thrust measuring setup. I have one where the digital fish scale is off to the side via a pully. I have always thought that there would be some losses in the pully. Does yours have the fish scale directly behind the slide?
Regards
Any chance of a photo of your thrust measuring setup. I have one where the digital fish scale is off to the side via a pully. I have always thought that there would be some losses in the pully. Does yours have the fish scale directly behind the slide?
Regards
02-01-2006 | 05:43 PM
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From: Heath,
TX
RE: JetJoe OWNERS thread
Watching this video:
http://cn.6158.net/xiazai/fjmx5.mpg
Says alot to me.
I have this plane with a Jetcat P60, and when I go to full power it literally leaps forward and is off the ground in about 100ft.
I have also seen this plane on a T-500 and results were the same.
The plane in this video seems to be lacking alot of power, very slow acceleration.
http://cn.6158.net/xiazai/fjmx5.mpg
Says alot to me.
I have this plane with a Jetcat P60, and when I go to full power it literally leaps forward and is off the ground in about 100ft.
I have also seen this plane on a T-500 and results were the same.
The plane in this video seems to be lacking alot of power, very slow acceleration.
02-01-2006 | 05:53 PM
#313
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RE: JetJoe OWNERS thread
ORIGINAL: TommyWatson
G'Day Mate,
Any chance of a photo of your thrust measuring setup. I have one where the digital fish scale is off to the side via a pully. I have always thought that there would be some losses in the pully. Does yours have the fish scale directly behind the slide?
Regards
G'Day Mate,
Any chance of a photo of your thrust measuring setup. I have one where the digital fish scale is off to the side via a pully. I have always thought that there would be some losses in the pully. Does yours have the fish scale directly behind the slide?
Regards
02-01-2006 | 11:16 PM
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From: Pendle HillNSW, AUSTRALIA
RE: JetJoe OWNERS thread
Thanks Mate,
I will do some tests and see if there is a difference. My engine exhaust is about 2 inches above the level of the board. I built it when I was just starting with turbines.
Regards
I will do some tests and see if there is a difference. My engine exhaust is about 2 inches above the level of the board. I built it when I was just starting with turbines.
Regards
02-02-2006 | 06:33 AM
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From: Newcastle, UNITED KINGDOM
RE: JetJoe OWNERS thread
[img]http://www.rcuniverse.com/gallery/galleryitemSolo.cfm?itemid=41309
[/img]
If thrust becomes an issue just get two JJs on board. Some ear plugs and bycycle clips for user protection is recommended. [8D] An English Electric Lightning is certainly on the jet wish list.
Paul
RCdriver
[/img]
If thrust becomes an issue just get two JJs on board. Some ear plugs and bycycle clips for user protection is recommended. [8D] An English Electric Lightning is certainly on the jet wish list.
Paul
RCdriver
02-02-2006 | 06:41 AM
#316
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From: Newcastle, UNITED KINGDOM
RE: JetJoe OWNERS thread
The twin engined Jetjoe turbined jet.
The dropped image link is
http://www.rcuniverse.com/gallery/ga...m?itemid=41309
This jet is a my old Blue Devil/Black Shark.
The dropped image link is
http://www.rcuniverse.com/gallery/ga...m?itemid=41309
This jet is a my old Blue Devil/Black Shark.
02-02-2006 | 11:54 AM
#317
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RE: JetJoe OWNERS thread
ORIGINAL: TommyWatson
Thanks Mate,
I will do some tests and see if there is a difference. My engine exhaust is about 2 inches above the level of the board. I built it when I was just starting with turbines.
Regards
Thanks Mate,
I will do some tests and see if there is a difference. My engine exhaust is about 2 inches above the level of the board. I built it when I was just starting with turbines.
Regards
The EE Lightning is the bees knees, I do beleive the Mick Reeves kit includes bicycle clips of Mick's own design.
02-05-2006 | 12:10 AM
#319
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From: Pittsburg,
KS
RE: JetJoe OWNERS thread
Here's a link to a video of my Intro taken Thursday flying with my JJ1400 putting out 11 lbs as compared to the video I posted earlier when I was getting about 8-9 lbs.
http://media.putfile.com/JJ-1400-Intro
Mike
http://media.putfile.com/JJ-1400-Intro
Mike
02-05-2006 | 06:20 AM
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From: Oudtshoorn, SOUTH AFRICA
RE: JetJoe OWNERS thread
Hi Mike,
I like the snap roll at the top into a spin. Comparing your performance to what i have seen and tested, your motor is putting more out than 11Lbs. I think if you use a load cell and good test stand it is more likely to be close to 14Lbs.
If you loose pressure at the diffuser it will reduce thrust drastically. Just unplug the gas line and leave open and see the thrust decrease. Casing pressure is very important.
Thanks for sharing and keep up the good flying.
Regards
I like the snap roll at the top into a spin. Comparing your performance to what i have seen and tested, your motor is putting more out than 11Lbs. I think if you use a load cell and good test stand it is more likely to be close to 14Lbs.
If you loose pressure at the diffuser it will reduce thrust drastically. Just unplug the gas line and leave open and see the thrust decrease. Casing pressure is very important.
Thanks for sharing and keep up the good flying.
Regards
02-05-2006 | 12:14 PM
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From: Pittsburg,
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RE: JetJoe OWNERS thread
Empty weight is 13.8 lbs, takeoff weight is just under 18 lbs.
One other factor between the two videos I posted that I had forgotten about is that in the first video I had much softer tires installed which had a high rolling resistance increasing the takeoff run even more.
I am satisfied with the current performance, so if my Jetjoe will hold up over time and be reliable I'm happy.
One other factor between the two videos I posted that I had forgotten about is that in the first video I had much softer tires installed which had a high rolling resistance increasing the takeoff run even more.
I am satisfied with the current performance, so if my Jetjoe will hold up over time and be reliable I'm happy.
02-10-2006 | 09:51 PM
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RE: JetJoe OWNERS thread
Okay, finally, the Three Tailcones Of Jetjoe.
In the pic with two cones, the one on the left is the original small tailcone provided with the earlier ones, on the right the two piece, the other pics are the new single piece tailcone.
In the pic with two cones, the one on the left is the original small tailcone provided with the earlier ones, on the right the two piece, the other pics are the new single piece tailcone.
02-10-2006 | 11:36 PM
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From: , UNITED KINGDOM
RE: JetJoe OWNERS thread
O.K Curtis...vernier calipers and calculator out...(a) whats the throat area of each of thre three tailcones ...(b) % difference in each...?
..Dave..
