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Search: Posts Made By: barit1
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Forum: Rumours & News
28th Feb 2010, 16:17
Replies: 3,239
Views: 1,137,470
Posted By barit1

Sir Richard The KLM 747 at ANC report is...

Sir Richard

The KLM 747 at ANC report is NTSB ANC90FA020 (http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X29893&key=1). I can lend a bit of insight - the volcanic ash ingestion eroded the...
Forum: Rumours & News
14th Feb 2010, 16:28
Replies: 3,239
Views: 1,137,470
Posted By barit1

Of course it's called the flare. I was just being...

Of course it's called the flare. I was just being a mite academic.

And I suppose a tailstrike would be the least of your worries.

Thanks for the confirmation, anyway, BR.
Forum: Rumours & News
14th Feb 2010, 14:54
Replies: 3,239
Views: 1,137,470
Posted By barit1

An 'umble question

I've oft been known to stick my foot in my mouth - and this is no exception:

Assuming (we all know what that means) that one has a choice of speeds at which to touch down off-runway, would you not...
Forum: Rumours & News
5th Aug 2009, 02:44
Replies: 3,239
Views: 1,137,470
Posted By barit1

Will F: Not quite true, except at SL. But...

Will F:


Not quite true, except at SL. But you gotta consider the whole envelope.

Think about this: The HP pump flow rate is directly proportional to core RPM, and is independent of altitude....
Forum: Rumours & News
3rd Aug 2009, 00:43
Replies: 3,239
Views: 1,137,470
Posted By barit1

That's what I thought. My point is that...

That's what I thought.

My point is that pumping fuel up to burner pressure takes a lot of energy, and when there's an excess of high pressure fuel available, that's heat that can be put to good...
Forum: Rumours & News
2nd Aug 2009, 21:09
Replies: 3,239
Views: 1,137,470
Posted By barit1

Not knowing the details of the Trent/777...

Not knowing the details of the Trent/777 installation -

The HP fuel pump is typically sized to pump fuel for the SL takeoff condition, which means it is oversized in cruise, and VERY oversized in...
Forum: Rumours & News
31st Jul 2009, 21:12
Replies: 3,239
Views: 1,137,470
Posted By barit1

A random thought

Liquid-fuel rocket engines use regenerative cooling (http://en.wikipedia.org/wiki/Regenerative_cooling_(rocket)), wherein the cryogenic fuel and/or oxidizer is used to cool the case and nozzle of the...
Forum: Rumours & News
7th Apr 2009, 01:48
Replies: 3,239
Views: 1,137,470
Posted By barit1

I am really surprised that Boeing let the R-R...

I am really surprised that Boeing let the R-R Triple7 out of the barn without very aggressive fuel heating capability. Boeing's experience with fuel icing goes back six decades - and they have a...
Forum: Rumours & News
7th Sep 2008, 14:23
Replies: 3,239
Views: 1,137,470
Posted By barit1

Brainstorming for a minute - only...

Brainstorming for a minute - only half-facetiously:

Inasmuch as fuel is the common link in BA038, 2 or 4 or 6 or 8 engines would be equally vulnerable.

The obvious answer is a dual-fueled...
Forum: Rumours & News
4th Sep 2008, 18:42
Replies: 3,239
Views: 1,137,470
Posted By barit1

I'm not sure this adds up. The "amazingly...

I'm not sure this adds up. The "amazingly efficient" Trent with more spools, and more bearings, probably has more heat generated in the oil, and thus any "stagnating" fuel will be exposed to more BTU...
Forum: Rumours & News
9th Aug 2008, 23:32
Replies: 3,239
Views: 1,137,470
Posted By barit1

The "blocked vent" theory might be viable; there...

The "blocked vent" theory might be viable; there could be enough air entering the tanks to sustain the engines through TOD down to approach altitude, albeit at less-than-spec inlet pressure to the HP...
Forum: Rumours & News
8th Aug 2008, 18:48
Replies: 3,239
Views: 1,137,470
Posted By barit1

Per TopBunk: I infer from this that the...

Per TopBunk:


I infer from this that the LP pumps (aircraft side) are implicated, and not the HP pumps (which are certainly engine-specific).

However, it may also be that the specific R-R HP...
Forum: Rumours & News
17th Jul 2008, 12:05
Replies: 3,239
Views: 1,137,470
Posted By barit1

Whatever happened to AVIATE, navigate,...

Whatever happened to AVIATE, navigate, communicate?
Forum: Rumours & News
15th Jul 2008, 12:12
Replies: 3,239
Views: 1,137,470
Posted By barit1

Not that this thread needs it, but add my $0.02...

Not that this thread needs it, but add my $0.02 support to advocacy for proper communication. :D

If a poster can't organize his words, does not that call into question the ability to organize...
Forum: Rumours & News
19th Jun 2008, 02:40
Replies: 3,239
Views: 1,137,470
Posted By barit1

I'm 99% certain the reference to "interference...

I'm 99% certain the reference to "interference with the fuel pump electronics" must really mean EMI to the FADEC. However that does not explain the fact that the fuel metering valves were commanded...
Forum: Rumours & News
15th Jun 2008, 23:57
Replies: 3,239
Views: 1,137,470
Posted By barit1

Just out of curiousity -

What might the 777 cruise fuel flow have been just before TOD? (call this point A)

And what fuel flow might have been demanded on a normal close final? (call this point B)

Between these two...
Forum: Rumours & News
15th Jun 2008, 15:35
Replies: 3,239
Views: 1,137,470
Posted By barit1

THAT, of course, is the $64 question (am I...

THAT, of course, is the $64 question (am I showing my age?)

One excitation possibility is the gear tooth passing frequency (assuming a gear-type HP pump).
Forum: Rumours & News
15th Jun 2008, 13:34
Replies: 3,239
Views: 1,137,470
Posted By barit1

Both the plumbing and the fluid therein (fuel,...

Both the plumbing and the fluid therein (fuel, possibly with air or vapor) have elastic properties: they store energy when under stress, and give that energy back when the stress is removed. That's...
Forum: Rumours & News
23rd May 2008, 01:45
Replies: 3,239
Views: 1,137,470
Posted By barit1

The fuel system engineers will follow this train...

The fuel system engineers will follow this train of thought, I trust, based on the difference between volume-unit and mass-unit measurements. If I follow that AAIB reading of the data correctly:
...
Forum: Rumours & News
18th May 2008, 16:51
Replies: 3,239
Views: 1,137,470
Posted By barit1

Often the gearbox-driven pump assembly contains...

Often the gearbox-driven pump assembly contains both an LP pump along with the HP pump. The purpose of the LP pump is essentially the same as the tank boost/transfer pumps, i.e. to keep a positive...
Forum: Rumours & News
17th May 2008, 22:23
Replies: 3,239
Views: 1,137,470
Posted By barit1

Once again, the discharge of the HP pumps is...

Once again, the discharge of the HP pumps is indeed at high pressure ( :ooh: ) to overcome the compressor discharge air pressure and feed the burner. Thus any air or vapor content would be compressed...
Forum: Rumours & News
14th May 2008, 21:09
Replies: 3,239
Views: 1,137,470
Posted By barit1

Does anybody know for certain the clock speed of...

Does anybody know for certain the clock speed of the Trent FADEC?

I once knew of a FADEC clocking at 120Mhz, with predictable coupling to VHF comm frequencies. :eek:
Forum: Rumours & News
7th May 2008, 22:29
Replies: 3,239
Views: 1,137,470
Posted By barit1

arcniz makes an excellent point re cavitation: ...

arcniz makes an excellent point re cavitation:


Such conditions may well exist at the HP pump inlet, but the pump discharge must still be at a much higher pressure to overcome the burner (air)...
Forum: Rumours & News
5th May 2008, 23:26
Replies: 3,239
Views: 1,137,470
Posted By barit1

Green-dot - All I can say to you is: please...

Green-dot - All I can say to you is: please re-read my post #1028.

Simply adding fuel may not produce the desired acceleration, if there is something abnormal going on in the core flowpath. You...
Forum: Rumours & News
4th May 2008, 02:59
Replies: 3,239
Views: 1,137,470
Posted By barit1

Turbine engine acceleration is a pretty complex...

Turbine engine acceleration is a pretty complex process. Simply dumping in more fuel does not assure the desired results.

The fuel controller (MEC, FADEC, whatever...) has been tailored to produce...
Showing results 1 to 25 of 25


 
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