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Search: Posts Made By: WojtekSz
Showing results 1 to 35 of 85
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Forum: Tech Log
30th Aug 2016, 07:33
Replies: 5
Views: 2,241
Posted By WojtekSz

correct yet with development via wind tunnel we...

correct yet with development via wind tunnel we are close to the coffins corner - not much freedom's left
with plasma we may break some boundaries and get a leap type progress - after all the known...
Forum: Tech Log
28th Aug 2016, 09:10
Replies: 5
Views: 2,241
Posted By WojtekSz

Plasma use for improved flow over the wings

there is an interesting article on experiments in flow control (http://www.pbs.org/wgbh/nova/next/space/plasma-air-control/) over wing front and rear edges using plasma. Serious optimization effects...
Forum: Rumours & News
7th Jan 2016, 06:10
Replies: 22
Views: 14,965
Posted By WojtekSz

@Aluminium if one decides to not use Russian...

@Aluminium
if one decides to not use Russian (possibly Chinese, Iranian and other Eastern sources, excluding NKorean!) than he agrees to see the situation through seriously and obviously biased...
Forum: Rumours & News
7th Jan 2016, 01:03
Replies: 22
Views: 14,965
Posted By WojtekSz

@ all interested thanks for opinions on...

@ all interested
thanks for opinions on Sputnik, which may be well justified, but this is just another news agency, very much like CNN or AlJazeera:
the information provided on KE007 is clearly...
Forum: Rumours & News
6th Jan 2016, 19:29
Replies: 22
Views: 14,965
Posted By WojtekSz

Korean KE007 shot down in '83 by accident - new data released

Welcome in 2016 - very best wishes for the peaceful and happy new year!

Just run across new data on Korean KE007 shot down over Sakhalin (USSR) back in 1983.
The source is unusual here but over...
Forum: Rumours & News
23rd Jul 2013, 06:17
Replies: 119
Views: 85,806
Posted By WojtekSz

@olasek to believe in statistics require more...

@olasek
to believe in statistics require more detailed knowledge what they are counting and how these incidents are gruoped.
As people here say: smoke/fire is more important than bulb/CB and...
Forum: Safety, CRM, QA & Emergency Response Planning
1st Nov 2011, 14:50
Replies: 415
Views: 293,446
Posted By WojtekSz

kudos to PF - landing was well balanced, and...

kudos to PF - landing was well balanced, and touched the tarmac with the rear of the fuselage, just a VERY small bump and slow lowering of the engines to touch the surface. Looked like a very...
Forum: Tech Log
23rd Jul 2011, 06:08
Replies: 3,435
Views: 1,674,436
Posted By WojtekSz

...or you are following previous orders to be...

...or you are following previous orders to be called back if the situation calls for it. Remeber we are taking about French plane with all French crew following clearly set 'power index' rules.

if...
Forum: Tech Log
7th May 2011, 09:24
Replies: 3,435
Views: 1,674,436
Posted By WojtekSz

@dfish: thanks for that link - excellent piece...

@dfish:
thanks for that link - excellent piece of investigative jurnalism
Forum: Tech Log
4th Apr 2011, 05:02
Replies: 3,435
Views: 1,674,436
Posted By WojtekSz

what is the position?

what is the position?
Forum: Tech Log
14th Feb 2011, 19:15
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg: exposing such information to public poses...

Derg:
exposing such information to public poses a threat to national security :ugh:
Now you can understand why some countries do close internet access at all - remember what some BIG money makers...
Forum: Tech Log
14th Feb 2011, 19:06
Replies: 746
Views: 210,958
Posted By WojtekSz

what do you want to say, really?

U415967:
looks like you may have not spent too much time reading all this forum before starting to write ;)
And possibly that is why RR is currently at 3rd iteration (C) of the solution for...
Forum: Safety, CRM, QA & Emergency Response Planning
13th Feb 2011, 00:37
Replies: 1,860
Views: 542,718
Posted By WojtekSz

what is exactly the instrument in 102 that is...

what is exactly the instrument in 102 that is missing the right colors so it cannot be used for HEAD flights but still be used for other flights?
Could it mean that the report is getting so harsh...
Forum: Tech Log
10th Feb 2011, 00:48
Replies: 746
Views: 210,958
Posted By WojtekSz

Turbine D, Derg: hey, you are both right !-...

Turbine D, Derg:
hey, you are both right !- there are basic problems somewhere within RR design and business but being an European i am a little biased towards trying to understand RR problems while...
Forum: Tech Log
9th Feb 2011, 21:30
Replies: 746
Views: 210,958
Posted By WojtekSz

yeah, you're right but would you build anything...

yeah, you're right but would you build anything valuable (say: a 0,1M$ house or a 10M$ bridge or a 10M$ turbine engine) based on such facts as we have here ;)
I would say these are good for...
Forum: Tech Log
9th Feb 2011, 18:25
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg: have you invented a new Deduction...

Derg:
have you invented a new Deduction Generator ;) ?
Looks like too much of a guesswork at play, why don't we stick to facts pls
Fan - carbon fibre is lighter but more expensive. Companies do...
Forum: Tech Log
8th Feb 2011, 19:45
Replies: 746
Views: 210,958
Posted By WojtekSz

Turbine D: thanks - your clear explanation +...

Turbine D:
thanks - your clear explanation + some web search produced much better understanding that the combustor tech can be very simple (available to enthusiasts) or complicated (professional big...
Forum: Tech Log
8th Feb 2011, 06:37
Replies: 746
Views: 210,958
Posted By WojtekSz

Turbine D, Barit1 thanks for good examples - it...

Turbine D, Barit1
thanks for good examples - it really is a case by case operation then ;) like fine tunung relative natural frequencies so they would not happen together. Does this tuning also...
Forum: Tech Log
7th Feb 2011, 22:49
Replies: 746
Views: 210,958
Posted By WojtekSz

Turbine D: thanks - it is a pure pleasure to...

Turbine D:
thanks - it is a pure pleasure to read such posts :)

could you pls tell a little more on techniques to absorb vibrations? The lower the weight and stiffer the shape the higher is the...
Forum: Tech Log
7th Feb 2011, 09:03
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg: look also at the second article...

Derg:

look also at the second article mentioned: http://www.eng.ox.ac.uk/samp/pubs/clifton_transfer.pdf and check fig 2.2 referring to trent 900 engine with data "...constructed from 200 hours of...
Forum: Tech Log
7th Feb 2011, 05:22
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg i believe the problem is actually not the...

Derg
i believe the problem is actually not the bearings but the structure supporting the bearings - forces, temperatures and vibrations do significantly impair bearings geometry and hence the...
Forum: Tech Log
6th Feb 2011, 20:21
Replies: 746
Views: 210,958
Posted By WojtekSz

yeah, i know there is some difference between...

yeah, i know there is some difference between micro and nano - i was boring holes to micrometer tolerances ;)
still we are discussing the accuracy of balls and the track: overall bearing...
Forum: Tech Log
6th Feb 2011, 12:43
Replies: 746
Views: 210,958
Posted By WojtekSz

thanks ;) this one should do better : ...

thanks ;) this one should do better :
http://mdrl.mne.psu.edu/papers/bearinganalyzer.pdf
Forum: Tech Log
6th Feb 2011, 10:54
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg bearings: i am learning from this...

Derg

bearings: i am learning from this thread rather than trying to teach anyone ;) even if having some experience from high precision machine tools spindles which needed the speeds and accuracies...
Forum: Tech Log
5th Feb 2011, 12:26
Replies: 746
Views: 210,958
Posted By WojtekSz

bear, Derg: the grease is not a solution - keep...

bear, Derg:
the grease is not a solution - keep in mind that the bearings need cooling which comes from the flow of cooling medium - in this case oil or oil mist (depending on load/speed). So the...
Forum: Tech Log
23rd Jan 2011, 22:47
Replies: 746
Views: 210,958
Posted By WojtekSz

Bearfoil: do i get you right: technically they...

Bearfoil:
do i get you right: technically they could have made a mistake but instead of making it clear they kept on selling the stuff hoping to get away with it?
Do you believe RR have already...
Forum: Tech Log
23rd Jan 2011, 22:35
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg: using the finite element method...

Derg:
using the finite element method scientist/engineers can predict mechanical beahviour of any part in known conditions. Actually they can model it according to known and proven cases. Problem...
Forum: Tech Log
23rd Jan 2011, 22:07
Replies: 746
Views: 210,958
Posted By WojtekSz

Bearfoil: i can agree to certain level of...

Bearfoil:
i can agree to certain level of vibrations from the burning process but i do belive that it must be very much similar to the very process eqisting in all other aero engines flying all...
Forum: Tech Log
23rd Jan 2011, 09:03
Replies: 746
Views: 210,958
Posted By WojtekSz

TurbineD: torsional load on the shaft and on...

TurbineD:
torsional load on the shaft and on the spline coupling comes form hot gases from burning process. Bearfoil calls it fluid drive but the fluid is still very compressable compared to any...
Forum: Tech Log
20th Jan 2011, 22:03
Replies: 746
Views: 210,958
Posted By WojtekSz

Spline Damage Due To Torque Stress

Derg:

actually both two-spool and three-spool engines have shafts inside shafts
when discussing different load components acting in any joint it is important to evaluate actual values of these...
Forum: Tech Log
20th Jan 2011, 21:06
Replies: 3,893
Views: 1,543,842
Posted By WojtekSz

Yiorgos: its good to know that even being a...

Yiorgos:
its good to know that even being a parapsychologist or shaman ona has certain limitations and certain dangers. After all this is working with souls or demons:
Imagine observing a medical...
Forum: Tech Log
15th Jan 2011, 10:59
Replies: 746
Views: 210,958
Posted By WojtekSz

there is also another difference concerning...

there is also another difference concerning spline location
in GP the spline is located directly 'inside' bearing and in T900 the IP spline is 'outside' of the bearing plane. The difference becomes...
Forum: Tech Log
15th Jan 2011, 09:27
Replies: 3,893
Views: 1,543,842
Posted By WojtekSz

well, this might be a little unconventional but: ...

well, this might be a little unconventional but:

has anyone tried to use some parapsychologist technology to show possible location of the plane? use several well qualified and independently...
Forum: Tech Log
9th Jan 2011, 15:58
Replies: 746
Views: 210,958
Posted By WojtekSz

bearfoil the strange thing with vibrations...

bearfoil

the strange thing with vibrations is that sometimes you can get better results by getting the item actually lighter (remember the famous story of Mr Citroen?). The trick is to get away...
Forum: Tech Log
9th Jan 2011, 14:34
Replies: 746
Views: 210,958
Posted By WojtekSz

Derg: thanks ;) i have posted the link to...

Derg:

thanks ;)
i have posted the link to both books to propose an explanation on how the shaft's splines have gone away as this is the problem RR has to solve. And this may in fact also include...
Showing results 1 to 35 of 85
 
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