Well someone else actually has some understanding that it isn't sand unlike Dave, huge and of course geoff. I assume Dave will never post here again after stating only people with experience of a particular subject should post.
dennis@home wibbled on Tuesday 20 April 2010 10:54
Pratt & Whitney/GE/Rolls Royce tea room:
Engineer 1: Do you think our engines will handle that volcanic ash?
Engineer 2: Dunno - let's Google uk.d-i-y - I heard they know everything.
Yep - sound advice.
;-> (for the hard-of-humour )
Easy like driving one Toyota and declaring the brand safe as you didn't encounter any problems.
MBQ
I have left this post untrimmed.
I am not writing about volcanic ash but what it can do to a jet engine, that is another subject altogether.
Now this is why I left this post un-trimmed. Just where did I write, or infer that they are the same?
Subject closed, for me.
Dave
I had assumed that everyone knew that the desert contained sand and not volcanic dust.
It doesn't, it tends to turn into glass in the combustion chamber.
Dave
well its broadly similar, but a lot more abrasive.
Both are essentially ground glass more or less, but the sand is a lot rounder. It doesn't tend to stick together in clumps.
And, by and large, it's a lot coarser too.
I see that UK flight bans have been extended again this afternoon, though it's curious looking at
Must be the wrong kind of dust over here................or maybe the government are scared of personal injury lawyers which seem to be a strangely British phenomenon within Europe.
Only over 1600 C, I'm informed, whereas the volcanic ash melts at about 900.
I am not claiming expertise, though.
Is this (penultimate sentence) correct ?
Some of them are helicopters...!
Why? Are you idle?
Do as you say others should do and don't comment on stuff you have no experience in. This is about volcanic ash and nothing to do with Saudi sand or anything else you have experience in.
Good, now remember not to comment on anything else you don't have experience in either.
I'm no expert on the combustion chamber, or the melting points, try asking Dennis, he claims to know more than us.
Dave
In message , "dennis@home" writes
As usual dennis - your ability to misquote is almost on par with your general ignorance
where did I mention that volcanic ash wasn't like sand?
Try reading what you post.
Nowhere have I claimed that, however you have on several occasions now and you have been wrong on all of them IIRC.
As for the melting points I don't know, however I can make an educated guess.. the lava is dull red and is therefore about 1000C and it is molten. However even if the ash melts at the same temp as sand it doesn't mean both will melt if they are sucked into a jet engine, grain size and transit time will have a significant effect.
In message , "dennis@home" writes
OK - here's what I posted retard
"Stick to telephones dennis
it's obvious that you have found another discipline which you don't understand and are determined to show everyone"
Now explain exactly where I even mentioned sand YTC
Seems to be some assumption there, or as you say an "educated guess". When in a hole?
Try reading your posts, I am not a primary school teacher so I am not qualified to teach you the basics.
If you mean that I assume the lava radiates as a blackbody then no, its not an assumption.
I'd be happy to oblige...
Pete
We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "
Cheers for that. I was unsucessful in getting much in the way of sunsets as the groundline was too high and the sun was very low before any effect kicked in - taking it through hedges didn't work very well. A couple of months ago there was a spectacular one and I suspect it might have been the same cause - or perhaps some other source - maybe Saharan dust.
Every morning now, there's a film of dust on the cars...
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