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JJ1400 14lb Turbine Stripdown/Rebuild

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JJ1400 14lb Turbine Stripdown/Rebuild

Old 01-31-2010, 07:36 AM
  #26  
Tadango
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

Good to see it running again EGT's look good. You made a flight with the 2 piece cone? I only get 4.62 kg's of thrust at 167k with the 2 piece. Egt's about the same as yours. A single piece cone from a 1200 (a bit wider then a 1400 cone) gave me 5.6kg's at 167. Egt rose 40-50.


Is it possible for you to measure the thrust?
Old 01-31-2010, 07:51 AM
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Xairflyer
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild


ORIGINAL: Tadango

Good to see it running again EGT's look good. You made a flight with the 2 piece cone? I only get 4.62 kg's of thrust at 167k with the 2 piece. Egt's about the same as yours. A single piece cone from a 1200 (a bit wider then a 1400 cone) gave me 5.6kg's at 167. Egt rose 40-50.


Is it possible for you to measure the thrust?
Yes flying has been done with two piece cone, I think the thrust is now the same as before with the single piece just going by the Push felt on the ground and the vertical performance. I believe I never had all injectors working properly from the start and the single piece cone then was poor, much different now. Single piece may be tried again at a later stage but not needed on this model anyway.
Old 01-31-2010, 07:59 AM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild


ORIGINAL: chrigui

Check the right bearing assembly...(the inner cone bearing must to be in center shaft direction)

Thanks maybe I have not worded it clear enough so I might take apart an old bearing today and take a pic showing the correct orientation of the inner cone to bearing outer case. Pictures do say much more, I will edit it in to that post.
Old 01-31-2010, 02:16 PM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

ok...no problem...
Old 02-12-2010, 10:36 PM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

Seamus, you've done an excellent job here in showing us n00bs how to go about stripping and rebuilding a Turbine.

Well done mate.

Is there any chance that you might be putting it all together in, say, a Word document that we could download somewhere and print off to use as a handy Manual in the garage?

Regards,

BJ
Old 02-12-2010, 10:38 PM
  #31  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

...or, alternatively, if you wouldn't mind, I could cut & paste your work and collate it...

BJ
Old 02-13-2010, 06:03 AM
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Xairflyer
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

I have planned to put it, plus other turbine related stuff, in a word doc for my own use (I forget easily ) and when I do I will probably put it on my website.
Old 02-13-2010, 07:40 AM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild




Yeah welldone Xairflyer , you done a great job and its good for all jj owners or at list most of them ..

Old 02-19-2010, 12:49 PM
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Jetbono
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild



Hey Pips

Im currently building a KJ66 style combustion chamber , does anybody know where I can get Inconel vaporizer tubes ?

Also WhichGrade inconel is best to use, 718 or 625 ??
Old 02-19-2010, 12:59 PM
  #35  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

you can buy it at wren.
Its 600, enough for the sticks.
Old 02-21-2010, 07:05 AM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild



What is the best way to make the combustor ends such as in picture bellow ?

Press or Spinning ?

Whats best ?
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Old 02-21-2010, 07:15 AM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

the part in the picture with pressing
Old 02-21-2010, 07:18 AM
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild


Do you think I will get better finish by spining ?

Ok , how much pressur do you think I would need to press that ?
Old 02-21-2010, 05:10 PM
  #39  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

I would suggest going onto the GTBA site for information like this, the guys there have been building KJ66 and other turbines for years and know the process inside out
Old 05-05-2010, 07:46 PM
  #40  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

ORIGINAL: Xairflyer


ORIGINAL: chrigui

Check the right bearing assembly...(the inner cone bearing must to be in center shaft direction)

Thanks maybe I have not worded it clear enough so I might take apart an old bearing today and take a pic showing the correct orientation of the inner cone to bearing outer case. Pictures do say much more, I will edit it in to that post.
Any chance I could get clarification on the orientation? One post says to put the tapered inner race towards the wheels (compressor and turbine) another post I interpret to mean one or both (not sure) should point towards the mid point of the shaft.
Which is it for both bearings?

Old 05-06-2010, 05:31 AM
  #41  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

Again maybe the wording is not clear, the inner race is tapered and the narrowest part of the taper points IN away from both wheels.
The arrow on the bearing case is the best to follow it should always point out (towards the wheels). see pictures in posts 8,9 &13

text from post 8
After cleaning and inspecting the shaft/wheel a new ceramic D688/602976 GRW bearing can be fitted. The bearings have an arrow stamped on the outer case, (see pic) this is for fitting the correct way around, the arrow points out towards each wheel. The reason for this is the bearing inner race is tapered.
Old 05-06-2010, 06:07 AM
  #42  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

Got it. Thanks.
Was cleaning and reinstalling bearings in a used RAM750. No arrows on outer case. Wanted to make sure they were in the correct orientation.

Mike
Old 05-06-2010, 06:26 AM
  #43  
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Default RE: JJ1400 14lb Turbine Stripdown/Rebuild

look this
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