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Search: Posts Made By: Rightbase
Showing results 1 to 35 of 39
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Forum: Rumours & News
16th Aug 2009, 00:36
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Sorry, Sooty

It isn't a case of either-or. It is and-and-and.

My (amateur) analysis of water source candidates based on information available is:
3Kg Max dissolved moisture at Beijing uplift (AIB all...
Forum: Rumours & News
6th Aug 2009, 20:32
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Post #1805...

Post #1805 (http://www.pprune.org/rumours-news/340666-ba038-b777-thread-91.html#post4377055) refers .....

PS - it is a real pity they didn't find melt water in the FOHE in their first inspection...
Forum: Rumours & News
6th Aug 2009, 19:45
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Good question for the general case, Chris, but...

Good question for the general case, Chris, but IIRC BA038 was pretty well water and ice free before starting the 2-way trip to Beijing and back.

So irrespective of where it collected, where...
Forum: Rumours & News
5th Aug 2009, 00:41
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Injecting water ...

is what happens after the frost in the centre tank melts, when the fuel purge pumps get hold of the melt water.
A bit of clever redesign might make the refreezing of this melt water in the cold main...
Forum: Rumours & News
5th Aug 2009, 00:00
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Possible solution ...

... warm refuelling.

Water in fuel tanks is inevitable and you are right - sumping is the answer - but it only works above freezing point.
Forum: Rumours & News
4th Aug 2009, 22:35
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Sumping - easier said than done sometimes...

No water in the fuel at cruise - too cold, it is all ice.
Descent to a surface still below freezing - atmospheric ingestion contains water vapour which at lower altitudes condenses as frost on the...
Forum: Rumours & News
5th Jun 2009, 22:12
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

The report refers earlier (p7) to the possibility...

The report refers earlier (p7) to the possibility of water accumulating during the flight rather than being ingested with the fuel burned .
and on page 8 to the effect of water injected into the...
Forum: Rumours & News
20th Mar 2009, 21:39
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Airfoilmod - Symmetry?

My light hearted observation was prompted by an assumption that since there is no (significant) net heat gain, one fluid body loses as much heat as the other gains, and a second assumption that it...
Forum: Rumours & News
19th Mar 2009, 19:58
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Redesign - Can we all have a go?

With nice clean fuel and nice clean oil, it doesn't matter which flows through the little tubes, and which flows round them.

But if the fuel is lumpy, perhaps because some water has been pumped...
Forum: Rumours & News
14th Mar 2009, 10:32
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Just to be safe ...

It would be reassuring to know that the redesigned FOHE can cope with ice pellets delivered at a greater rate than the CWT fuel scavenge system can shoot water into the main tank.
Forum: Rumours & News
2nd Mar 2009, 19:25
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Everybody knows where it comes from ......

Why all the emphasis on
?
With respect, we knows where the water in fuel tanks (ground based or airborne) comes from - it comes from the atmosphere - either warm wet air being cooled, or suspended...
Forum: Rumours & News
27th Feb 2009, 22:22
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

answer=42 - possibly....

The thread you quote says the amount of water that can accumulate is quite substantial.

Against - there was a limited time window for it to accumulate after the inspection.
For - water...
Forum: Rumours & News
21st Jan 2009, 19:30
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Question from a confused lurker:

misd-agin writes:



How would this tell us more than we (or the programmers of the sim) already know from the flight dynamics model programmed into the simulator?

Presumably the flight tests...
Forum: Rumours & News
27th Oct 2008, 22:32
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Photographic evidence posted earlier shows the...

Photographic evidence posted earlier shows the fuel was cold enough to cause frost on the lower wing surface.
Forum: Rumours & News
7th Sep 2008, 19:51
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Puzzling .....

Green-dot, Swedish Steve:

There are so many unknowns. Not disagreeing, just thinking on....

For an arrival in approx freezing temperatures, my calculations suggest a worst case of 500ml of new...
Forum: Rumours & News
5th Sep 2008, 22:10
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Respect...

An impressive AAIB report which I am sure will reward more study.

For those unhappy that an extremely unlikely event should affect two independent systems within a few seconds of one another -...
Forum: Rumours & News
7th Aug 2008, 19:53
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

The fuel problem...

As I recall, the AAIB did report - or imply - a problem with the fuel. It was not getting to the fire.

The 'throttles' were open, the engines were sucking, the pumps in the tanks were...
Forum: Rumours & News
26th Jul 2008, 13:41
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Newbie guide?

Peter - there is a 'search this thread' button at the top of the forum window.

Try searching for temperature specification or other words likely to be in any post answering your question.

The...
Forum: Rumours & News
19th Jun 2008, 00:16
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Hmm.... Silly late night thought. If senior...

Hmm....
Silly late night thought. If senior government officials could be persuaded to sit directly above the high pressure fuel pumps it might solve some of our other problems.
Forum: Rumours & News
16th Jun 2008, 22:45
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

The farther back we take the the history of the...

The farther back we take the the history of the aircraft, the easier it is to find a unique set of circumstances. So looking at the centre tank (a common feature linked to the two independent wing...
Forum: Rumours & News
12th Jun 2008, 21:40
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

777fly- Air bubbles in the fuel do not cause...

777fly-

Air bubbles in the fuel do not cause cavitation damage. The air cushions the collapse of the air bubble, so the bubble does not disappear when pressure is restored, and there is no...
Forum: Rumours & News
30th May 2008, 22:09
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Or a humble rheogoniometer.

Or a humble rheogoniometer.
Forum: Rumours & News
27th May 2008, 16:29
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Pp: Cavitation bubbles are full of low...

Pp:

Cavitation bubbles are full of low pressure gas or vacuum, and they occur as the fluid is torn apart by suction. The vacuum filled bubbles collapse implosively when pressure is restored and...
Forum: Rumours & News
13th May 2008, 22:11
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Some water in the fuel?

Can anybody work out what the effect of a few litres of water per minute mixed in with the fuel would be? Would it be enough to account for the observed loss of power?

I ask because water could...
Forum: Rumours & News
7th May 2008, 21:29
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Cavitation damage is hard evidence

The cavitation damage may or may not be relevant to this incident, but it is incontrovertible evidence that at some stage in its life that pump has had to suck harder than it should. Or put another...
Forum: Rumours & News
2nd Apr 2008, 23:58
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Not necessarily...

The subject of the observation was the timing rather than the failure of fuel scavenge. Ice could possibly delay the onset of scavenge until some time during the descent, then melt away and be...
Forum: Rumours & News
2nd Apr 2008, 22:15
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

bsieker: Assuming the scavenge system was...

bsieker:


Assuming the scavenge system was working properly, and not iced up.
Forum: Rumours & News
1st Apr 2008, 22:25
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Water in fuel

Sunfish - have you seen the post by UNCTUOUS (P35 post681) where in response to several reports from users, Boeing theorise that water might be accumulating in the centre tanks of -200LR and -300ER...
Forum: Rumours & News
31st Mar 2008, 20:39
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Snanceki said: Possibly because I am...

Snanceki said:


Possibly because I am guilty of not answering it. An apology and explanation are in order.

Sorry.

Explanation:
I just hate the way some news media capitalise on natural...
Forum: Rumours & News
31st Mar 2008, 08:04
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

snanceki: re Airfoilmod There are several I...

snanceki: re Airfoilmod

There are several I can think of, but the obvious reason is they must be free to speculate about all the possibilities in order to eliminate those they can. Publishing...
Forum: Rumours & News
30th Mar 2008, 22:33
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

airfoilmod Care to share? Google not...

airfoilmod



Care to share? Google not delivering - perhaps I'm not touching the right nerve.
Forum: Rumours & News
30th Mar 2008, 16:01
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Airfoilmod: I'm curious - do you have...

Airfoilmod:



I'm curious - do you have a link to the details by any chance?
Forum: Rumours & News
3rd Mar 2008, 10:44
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

According to the diagram provided in an earlier...

According to the diagram provided in an earlier post (sorry - can't find it at the moment) the centre tank fuel scavenge outlet is at the outboard (high) end of the main tank. To get to the engines...
Forum: Rumours & News
3rd Mar 2008, 07:16
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Yes, 777fly, my outsider's view is showing its...

Yes, 777fly, my outsider's view is showing its weaknesses.

The increase in volume of 4000Kg (about 320 - correction - 5000 litres) can only be supplied by adiabatic expansion if there is enough...
Forum: Rumours & News
3rd Mar 2008, 06:56
Replies: 3,239
Views: 1,137,456
Posted By Rightbase

Micro-muck

This is air pollution muck - NSEU - and its sink rate is very low within its water carrier.

Thanks for the 400Kg/hr figure. I was wondering how 'leisurely' the scavenge was.

If a dam of ice...
Showing results 1 to 35 of 39
 
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