Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

31

General Discussion Area / Re: What has P*ssed you off today?

« on: 03 January 2024, 12:14:06 »

I understand where you're coming from, I suspect that we do it for fatigue management purposes on longer sectors rather than ETOPS.

It's the little details that make the difference, and had anyone in the flight deck of the Dash 8 looked right, they should have seen the A350 on finals and could have clarified their clearance, although that might not have been a culturally 'correct' thing to do.

But it will all come out in the wash.

Latest 'rumours' are that...

1) The Dash8 had been lined up on the runway for 45-60 seconds before the impact. If correct, then even if the co-pilot had looked up the approach before entering the active, there would have appeared to be space/time - the A350 would have been 2-3 miles away which is fine in VFR conditions.

2) Dash 8 strobes were not on, because SOP is to turn them on only once take of clearance is received. TO clearance was not issued.

3) The A350 and Dash 8 were on different Tower Frequencies. These may or may not have been bandboxed (joined transmissions so one freq can be re-heard on the other). If they were not bandboxed, then neither plane would have been aware of clearances issued to the other.

4) Some runway and taxiway lighting NOTAMED as in-op - Specifically the STOP markers at the intersection of C5 and RWY.

5) ATC clearances in English perhaps mis-understood by non native English speakers.

Does sound like the holes in the cheese are lining up. All very sad - the sort of thing that shouldn't happen, but there for the grace of god...

32

General Discussion Area / Re: What has P*ssed you off today?

« on: 03 January 2024, 10:32:25 »

We operate our 350s with three flight crew... An extra pair of eyes is never a bad thing.

But "you" don't operate A350's on domestic routes. I did about a dozen flights in Japan a decade or so ago - and all were on B747-400's. They have a very high passenger rate between relatively close cities. Basically no A320 sized (180-200 pax) commuter stuff - it's all done with 350-400 seat B777/A350's even on short sectors. No need for ETOPS style crewing on that.

33

General Discussion Area / Re: What has P*ssed you off today?

« on: 03 January 2024, 10:12:42 »

It's been suggested elsewhere that the Dash 8 was turning into the runway a ways along it for a short take off (the Dash 8 being a pretty effective STOL aircraft) just as the 350 main gear touched down. Effective they dropped the nose gear into the back of the Dash 8.

Some variables which depend on how the 350 was configured for landing and some will be airline rather than type specific...

If the thrust reversers on the A350 have an auto mode, then once the mains touched, then the WOW system would have automatically pulled the throttles back and deployed the reversers... At which point TOGA override would have been impossible. (This is one thing that Ryanair flight crews seem to do quite often that is actually quite dangerous... Activating the reversers between flare and touchdown...removes all options).
However, the engines showed no sign of the reversers having been deployed, so the throttles were being manually operated. In which case, hitting the the TOGA switch would have opened the throttles and the aircraft would accelerate and climb without any other input... The configuration of the wings for landing makes for a decent amount of lift with modest throttle so it's an almost exponential reaction... More throttle = more thrust = more airspeed = more lift. Done early enough, they might have swatted the Dash 8 with the tail. Have had a couple of go arounds after the mains have touched, so it is a reasonable thing to do.

The A350 flight crew should have seen something unusual ahead of them even if it didn't register as an aircraft... Runway lights blocked from view would have been one thing, lighting on the Dash 8 another. And the landing lights on the A350 would have illuminated from a reasonable distance, although ~130knots wouldn't take too long to be on top of it.

Can see the blame being laid squarely onto the Dash 8 crew and controllers with some responsibility to the A350 crew for not seeing the Dash 8 earlier.

Think of it as a car pulling out of a side road onto a dual carriageway a couple of hundred yards in front of another car without looking.  Yes it's their fault for not looking but the driver of the car on the dual carriageway should be looking far enough ahead to anticipate it and react accordingly.

There were experiments carried out at LAX a few years back after a similar incident. Dash-8's and similar are incredibly difficult to see in the dark against all the other airport and runway lighting. Also SOP is not to turn on anti-collision lights and runway spot lamps until you're lined up and ready to depart - so the Dash 8 may not even have been strobing. It would have been a miriacle if the A350 drivers had seen the Dash8 in time to go-around.

My bet is the Dash8 crew misunderstood an ATC instruction to "Line up after landing A350" (or similar) and pulled onto the runway infront of the landing airliner.

34

General Discussion Area / Re: What has P*ssed you off today?

« on: 03 January 2024, 10:04:43 »

Apparently nobody knew the DASH8 was on the runway because it doesn't have ADSB. Hmm...

That's a mis-understanding of how ADSB is used.

There is full ADSB-out whereby an aircraft transmits its lat-long when interrogated by a SSR radar source. This is what things like FR24 rely on to track aircraft. But there is also an earlier standard (Mode S) where the aircraft replies to normal Mode A/C/S SSR interrogations, but does not respond to ADSB position requests.

Most military/government aircraft do not respond to ADSB position requests, and hence don't show up on FR24 and the like. They will show up on the airports own SSR radar screens due to the Mode S responses.

There are some 'open world' tracking sites such as ADSB Exchange that support something called MLAT. This allows non ADSB-out aircraft to be located by triangulation. However, for that to work it needs at least 3 receivers to be getting signals from the aircraft, and in that area of Japan it appears coverage is not good enough to track anything by MLAT below about 1500'. So the coast guard plane doesn't show on any publically accessible trcking sites.

Just because you and I can't 'see' it on FR24 does not mean that ATC cannot see it on their screens.

35

General Discussion Area / Re: Lotus omega v8 conversion

« on: 29 December 2023, 12:30:52 »

Aha, thats why i cant find info about omega/carlton on this forum.
In sweden this cars are all called omega...
I appreciate the info.
Thanks.

The main source for help on the older Omega A / Carlton, and especially the Lotus Carlton/Omega is a club called The Autobahnstormers. There is a considerable overlap between info here and there, and some of us are members of both. There is an internet forum, but access requires club membership - I think it's £30 a year.

If you need help on an Omega A /Carlton issue then that's were I recommend you go. However, I've been a member since about 1997 and I don't remember anyone successfully completeing a V8 transplant into a Carlton.

36

General Discussion Area / Re: Lotus omega v8 conversion

« on: 29 December 2023, 12:23:13 »

It will almost dro straight in, as per my previous post.

It won't. Many have started down that route and I'm not aware of any that have succeeded in a RHD Carlton.

The Carlton/OmegaA has a different subframe and steering system to the Commodore. They look similar, but there are very few parts that are inter-changable between them.

37

General Discussion Area / Re: Lotus omega v8 conversion

« on: 28 December 2023, 20:44:09 »

Not mad ,maybe a little crazy.
 Actally bought me a lotus replica ,not the real deal.
But there is no engine or transmission in the car.
Im trying to find info if somebody had put a v8 in omega a ,but its hard to find info on the internet.
Would it fit?

If it's a replica, you will never get your money back whatever you do. Best bet would be to try and find a Carlton GSi3000i or a Senator 3000i with engine and gearbox in it. These are probably rarer now than "Genuine" Lotus Carltons/Omegas, but if you can find one in a scrappy or eBay then the  parts should just swap over. There is a 12 valve and a 24 valve version of the GSI3000. 24V is higher powered, but the 12V is preferred my many owners for strength and reliability. Ok 'only' 220BHP ish(for the 24V), but should be a shed load cheaper than a V8 conversion.

38

General Discussion Area / Re: Lotus omega v8 conversion

« on: 28 December 2023, 20:35:50 »

My main issue would be that its an insane thing to even consider. Ruining a very expensive car by dropping an old lump of yank iron in to replace the Lotus developed engine already in there.

That's assuming the current engine is servicable or reparable. We don't know that.

If it's put a rod through the block,(which I have seen - still got that block in the lockup) then getting a 'new' or recon C36GET will be a lot more expensive than throwing in a V8.

Lotus have already done some of the work required - Google Corvette ZR-1. Same/similar gearbox and same ECU. You won't get a ZR1 engine for £5K though.

39

General Discussion Area / Re: Lotus omega v8 conversion

« on: 28 December 2023, 19:18:18 »

I know that, but the OP question is about putting a V8 into an old Carlton shell. So no connection with the straight 6 Lotus version at all, just a mention in the title for some strange reason.

The Lotus Carlton is a RHD 1989-> Carlton fettled at Hethel.
The Lotus Omega is a LHD 1989-> Omega A fettled at Hethel.

The Carlton Is a RHD Omega A, and vice verca.

Unless Ive missed something and he is actually mad enough to put an american V8 into a genuine Lotus Carlton ?   

I think that's nail on the head. Never got directly involved in one, but my understanding is it *should* be possible in a LHD Omega A, but quite difficult in a RHD Carlton. Whenever I've listened to people saying they are going to attempt it I believe the main issues are steering box, steering gear, subframe and brake servo/modulator.

40

General Discussion Area / Re: What has P*ssed you off today?

« on: 20 December 2023, 11:58:30 »

Royal Mail. Got one of those red "you weren't in" cards through the door yesterday. Not too unusual, but this one just says contact us to arrange re-delivery. So log on, and the only option is to redeliver sometime Mon-Fri  -when I'm at work. There is no option to collect from the local sorting office, and the option to collect from a local post office doesn't work.

No idea what the parcel is - I haven't ordered anything so best guess is someone has sent me a Crizzy prezzie, but I'm fed up with people sending stuff that needs signing for. Just put if through the f*c*ing letter box.

Royal fail now automatically try to re-deliver the next working day now IIRC 

Various tick boxes on this particular red card - including the 'we'll try to redeliver tomorrow' . However, that tick box wasn't ticked, just the please contact us to arrange re-delivery. I've managed to get them to agree to a Saturday delivery when I should be in. However, delivery could be any time between 8am and 8pm - so that's all Saturday screwed.

41

General Discussion Area / Re: What has P*ssed you off today?

« on: 20 December 2023, 11:18:07 »

Royal Mail. Got one of those red "you weren't in" cards through the door yesterday. Not too unusual, but this one just says contact us to arrange re-delivery. So log on, and the only option is to redeliver sometime Mon-Fri  -when I'm at work. There is no option to collect from the local sorting office, and the option to collect from a local post office doesn't work.

No idea what the parcel is - I haven't ordered anything so best guess is someone has sent me a Crizzy prezzie, but I'm fed up with people sending stuff that needs signing for. Just put if through the f*c*ing letter box. 

42

General Car Chat / Re: do we have any jetronic LE2 experts please ?

« on: 03 November 2023, 20:18:12 »

Post a photo of the internal boards and I might be able to tell you how to fix it. If the semiconductors are standard parts they can be replaced.

43

Omega General Help / Re: ABS-light constantly on after replacing front ABS/wheel speed sensors

« on: 30 October 2023, 17:13:22 »

Once you get the bit between your teeth, Malcolm.........

The question occasionally crops up in 'another place', and now I've got something to beat the non-believers over the head with

44

Omega General Help / Re: ABS-light constantly on after replacing front ABS/wheel speed sensors

« on: 30 October 2023, 12:00:41 »

Todays results from the Somerset 'elf-n-safety' conscious test labs....

The Markings on the sensor are 0265 001 220, which is the Bosch part number. The word Bosch is also molded into the rubber boot on the sensor.

I polished up the knuckle, and mounted the hub. Not torqued up to 300Nm, but tight enough for this. Then mounted it in the bench mill, with a bodged up drive assembly, and got it as centered as I could.


Then fired up the feeler gauges to measure the clearance...


The 0.8mm gauge goes in fine, the 0.9mm is snug, and the 1.0mm will not go in. So I'd say the installed clearance from sensor tip to reluctor ring is +/- 0.9mm (ish). I wouldn't argue or be worried about any value in the 0.8mm-1.0mm range though.

Then fire up the bench mill, and record the sensor waveforms on a cheap USB scope. The setup wasn't very well balanced, so I lost my bottle at 700Hz as the thing was shaking the desk and threatening to tip my cup of coffee over. Anyway...Scope traces at 100Hz, 200Hz, 400Hz and 700Hz.






Assuming standard tyres (235R45-17) with a rolling radius of 79.57 inches (2021mm), then these sensor frequencies equate to...

100Hz = 2.08 Rev/s = 165.5 inches/sec = 9.4 MPH
200Hz = 4.17 Rev/s = 331.0 inches/sec = 18.8 MPH
400Hz = 8.33 Rev/s = 662.0 inches/sec = 37.6 MPH
700Hz = 14.16 Rev/s = 1158.5 inches/sec = 65.8 MPH

As you can see, the sensor signal grows from about 140mV ptp at 100Hz (9.4MPH) to 630mV ptp at 700Hz (65 MPH). I'll leave you to extrapolate what happens at other speeds. The point is the output from the sensor is probably supposed to be of the order 100mV ptp at 5MPH, up to perhaps 1V ptp at 100MPH.

There will be quite a large tolerance in the ABS system to cope with mechanical and sensor variations - but these are the figures I can demonstrate.

Remember this is all Carlton gear. There is a possibility the Omega B is different. However, your "Holstein" sensors are producing significantly less signal voltage than these Bosch ones do (even at your reduced clearance), and I strongly suspect they are the cause of your issues.

45

Omega General Help / Re: ABS-light constantly on after replacing front ABS/wheel speed sensors

« on: 29 October 2023, 21:36:58 »

And....just been looking at your oscilloscope shots.

The frequency readout say 116Hz, 77Hz and 91Hz. There are 48 teeth on the reluctor ring, so the actual wheel speeds will be one forty eighth of this - 2.41Hz (145 RPM), 1.60Hz (96 RPM) and 1.90Hz (114 RPM)

Do you really mean you were testing at 2 RPM - or two revs per second (i.e. 2Hz = 120 RPM)?