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Search: Posts Made By: CliveL
Showing results 1 to 35 of 290
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Forum: Tech Log
28th Oct 2023, 09:30
Replies: 13
Views: 3,639
Posted By CliveL

Not logged into PPRune for some time John. With...

Not logged into PPRune for some time John.
With caveats: a) memories blur after half a century, b) this was an area of Aerospatiale responsibility
Worth remembering Concorde instruments and...
Forum: Tech Log
20th Jul 2022, 16:27
Replies: 45
Views: 4,629
Posted By CliveL

I had never thought of it before, but: For...

I had never thought of it before, but:
For there genuinely to be nothing else happening the lift and pitch balances must be satisfied simultaneously.
If the aircraft started in trimmed 1g flight...
Forum: Tech Log
20th Jul 2022, 07:21
Replies: 45
Views: 4,629
Posted By CliveL

John, I wasn't going to post anything as it has...

John,
I wasn't going to post anything as it has all been said, but since you ask:
Concorde, like many supersonic aircraft, has wings swept so that the flow normal to the LE is subsonic. That being...
Forum: Tech Log
19th Jan 2022, 10:51
Replies: 2,133
Views: 1,678,063
Posted By CliveL

This extract from Norman Harpur’s 1966 paper on...

This extract from Norman Harpur’s 1966 paper on “The Structure of the Concorde” explains it pretty well I think. Norman was the chief structures engineer on the British side so he can be classed as...
Forum: Tech Log
10th Sep 2018, 19:00
Replies: 56
Views: 13,119
Posted By CliveL

@ Concours This might help you understand...

@ Concours

This might help you understand what forces act where

https://cimg1.ibsrv.net/gimg/www.gmforum.com-vbulletin/661x529/z184_zpsed5e397c_186cf00d536a4100de67a876d86f928e09e0502d.jpg

@...
Forum: Tech Log
17th May 2018, 07:52
Replies: 14
Views: 3,448
Posted By CliveL

Can't see any reason in principle why one should...

Can't see any reason in principle why one should not tap cooling air earlier in the cycle, but I was under the impression that the Ol 593 cooling technology was state of the art for a 1960's engine...
Forum: Tech Log
16th May 2018, 06:56
Replies: 14
Views: 3,448
Posted By CliveL

1100 deg C at M 2.0 ISA +5

1100 deg C at M 2.0 ISA +5
Forum: Tech Log
15th Dec 2017, 08:15
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@SSDriver Yes, I had seen the video, but...

@SSDriver

Yes, I had seen the video, but although he states things with apparent confidence his view is not supported by the formal report.
Consider the final report wording quoted in my post...
Forum: Tech Log
14th Dec 2017, 14:16
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@SSDriver You are quite right; I should have...

@SSDriver

You are quite right; I should have checked that :O
A simple check of BEA's figures shows that they were assuming transfer into the feeder tanks.
Their sums say one needs to transfer...
Forum: Tech Log
13th Dec 2017, 20:12
Replies: 2,133
Views: 1,678,063
Posted By CliveL

If the intent was to get the CG forward, what...

If the intent was to get the CG forward, what would be the point in transferring fuel to anything other than the forward trim tank? In particular why to the engine feed tanks which are arranged to be...
Forum: Tech Log
13th Dec 2017, 17:08
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@Lancman There a a lot of misinformation...

@Lancman

There a a lot of misinformation sculling around on this.
The final report states that the overfill was 300 litres (237kg) put into the engine feeder tanks 1 to 4. These tanks are grouped...
Forum: Tech Log
13th Dec 2017, 08:56
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@Lancman Not so on several counts 1....

@Lancman

Not so on several counts

1. The phenomenon of structural damage arising from internal pressure waves in fuel tanks was unknown when Concorde was designed. Consequently the design made...
Forum: Tech Log
30th Nov 2017, 08:27
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Casper You might find it useful to read the...

Casper

You might find it useful to read the BEA accident report (in English) f-sc000725a which has all the information you are looking for
Forum: Tech Log
8th Feb 2017, 14:55
Replies: 2,133
Views: 1,678,063
Posted By CliveL

I think we are pretty much on the same page. ...

I think we are pretty much on the same page.
Since the cg is generally close to the landing gear longitudinally, to all intents and purposes the height changes are the same on most aircraft. Pitch...
Forum: Tech Log
8th Feb 2017, 12:56
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@EXWOK I like your last paragraph - that is...

@EXWOK

I like your last paragraph - that is exactly the advice we gave Trubbie before first flight!

No problem either with your view that negative lift was never a practical problem, but on...
Forum: Tech Log
5th Feb 2017, 08:00
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Bellerephon: Interesting! About eighteen...

Bellerephon:

Interesting!
About eighteen months ago a MD11 piloting friend and I had a close look at that machine to see if we could identify any features that might explain its poor hard landing...
Forum: Tech Log
4th Feb 2017, 07:26
Replies: 2,133
Views: 1,678,063
Posted By CliveL

This may be overtaken by later postings, but a...

This may be overtaken by later postings, but a couple of reasons why n5692s's explanation might not work:-

Most of the lift is generated on the upper surface and is dominated by the vortex lift...
Forum: Tech Log
3rd Feb 2017, 15:31
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Can any of our pilot contributors confirm...

Can any of our pilot contributors confirm n5296s's remarks re landing in a strong headwind?
For my part I was never aware of any complaints
Forum: Tech Log
17th Jan 2017, 07:29
Replies: 13
Views: 4,791
Posted By CliveL

Nice one! Thanks for your efforts

Nice one! Thanks for your efforts
Forum: Tech Log
21st Dec 2016, 16:48
Replies: 2,133
Views: 1,678,063
Posted By CliveL

4 min limitation, of my memory serves, is because...

4 min limitation, of my memory serves, is because reverse thrust blocks off the cooling air flowing over the engine mounted accessories. The limitation is then to stop them cooking up.

Regarding...
Forum: Tech Log
7th Jan 2016, 19:35
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Concorde eastbound

@tomahawk, pattern is full

You really need an input from a BA pilot, but my memory is that the approach to LHR was up the Bristol Channel not the English Channel.
Original decel point was moved...
Forum: Tech Log
15th Oct 2015, 12:49
Replies: 2,133
Views: 1,678,063
Posted By CliveL

There was a lot of work devoted to minimising...

There was a lot of work devoted to minimising drag of surface discontinuities etc, but almost nothing on skin surface changes. I'm not sure we understood enough about supersonic skin friction with...
Forum: Tech Log
15th Oct 2015, 08:27
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Bit of a hypothetical question requiring a...

Bit of a hypothetical question requiring a judgemental response!
My short answer would be not much more than the certified limits - at least not without significant modifications.
FL680 was...
Forum: Tech Log
23rd Apr 2015, 14:36
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Thank you everyone - much appreciated

Thank you everyone - much appreciated
Forum: Tech Log
23rd Apr 2015, 07:09
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Sorry, you will have to excuse my confusing...

Sorry, you will have to excuse my confusing statement as I am writing from. hospital bed and not at my sharpest!

To be clear, the original question related to maximum speed which I took to be Vd -...
Forum: Tech Log
22nd Apr 2015, 15:26
Replies: 2,133
Views: 1,678,063
Posted By CliveL

At low altitude think 455 ktCAS. Tmo was a...

At low altitude think 455 ktCAS.
Tmo was a long exposure structural limit
Mmo was an intake limit
Vmo was a structural (flutter) limit
Forum: Tech Log
13th Apr 2015, 07:46
Replies: 2,133
Views: 1,678,063
Posted By CliveL

I suppose there might have been a combination of...

I suppose there might have been a combination of system failures that would have caused it to deploy, but AFAIK it never did, so there was nothing to write up.
Forum: Tech Log
12th Apr 2015, 15:36
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@ Volume Sorry for slight delay; I hadn't...

@ Volume


Sorry for slight delay; I hadn't a clue and had to ask an old friend who was directly involved in Flight Test. This is his verbatim reply:




I think that is about as much as one...
Forum: Tech Log
9th Apr 2015, 19:05
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Thanks dazdaz; that's the shot I was trying to...

Thanks dazdaz; that's the shot I was trying to post.:ok:
Forum: Tech Log
9th Apr 2015, 07:24
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@stilton Yes they did. I tried to post a...

@stilton


Yes they did. I tried to post a photograph but the Dropbox link doesn't seem to work any more (neither does the "quote" icon)
Forum: Tech Log
8th Apr 2015, 07:02
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Leaky

@a-q


Ah yes, page 55 from 4 years ago ...... It's my age you know!


What threw me was your reference to a leaky intake - on 101 it was all the nacelle aft of the intake that leaked not the...
Forum: Tech Log
5th Apr 2015, 07:55
Replies: 2,133
Views: 1,678,063
Posted By CliveL

@EXWOK There was a certification...

@EXWOK


There was a certification requirement for descent time from FL600 down to FL100 if I recall correctly. Can't remember the value though. In flight reverse was developed to trim some...
Forum: Tech Log
29th Jun 2014, 15:12
Replies: 2,133
Views: 1,678,063
Posted By CliveL

They were an attempt to avoid the mechanical...

They were an attempt to avoid the mechanical complexities of the prototype double hinged 'barn door' combined dump door/auxiliary intake by having several 'blow-in' vanes set in the door which were...
Forum: Tech Log
4th Mar 2014, 16:51
Replies: 2,133
Views: 1,678,063
Posted By CliveL

Sorry Nick, you are out of luck on that one. It...

Sorry Nick, you are out of luck on that one. It was tailor made to optimise cruise drag. Varied from 3% thick at the root to 1.8% near the tip, but the camber and twist don't fit any recognisable...
Forum: Tech Log
22nd Feb 2014, 12:04
Replies: 2,133
Views: 1,678,063
Posted By CliveL

SSD I know they aren't anything to do with...

SSD

I know they aren't anything to do with AICUs but seeing where they are located and looking at Bellerephon's diagram I would think they are reference static ports for the air conditioning...
Showing results 1 to 35 of 290
 
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