Silvertown Tunnel Works – 26th June 2023
I took these pictures of the Silvertown Tunnel works on the North Bank of the Thames today.
I went on to Woolwich, did some shopping and then took the Elizabeth Line to Whitechapel to come home.
New Wellington Railway Station Worth £15m Could Open By 2025
The title of this post is the same as that of this article on the BBC.
This is the sub-heading.
Efforts to build a new railway station could soon move a step closer – if plans for 220 new homes are approved.
These are the first two paragraphs.
Somerset West and Taunton Council and Mid Devon District Council put together plans to reopen Wellington and Cullompton railway stations
Both closed during the infamous Beeching cuts of the mid-1960s.
Reading the article, it looks like the Department for Transport are going to pay for the station.
Four weeks ago, I went to the opening of Reading Green Park station, which I wrote about in Reading Green Park Station – 27th May 2023.
When I was there, I met the guy, who works for Great Western Railway, who is responsible for new stations in the area, who when I asked him about Wellington and Cullompton, indicated that they might be treated together.
In Thoughts About Electrification Through Devon And Cornwall, I speculated that there might be some electrification in the area to charge battery-electric trains on their way to and from the Devon and Cornwall Peninsular. As the M5 motorway goes through the area close to the railway, who would complain about some well-designed overhead electrification.
Network Rail could even use a design like this.
The structural rhomboid shape on top is made from laminated wood.
I describe it in detail in Prototype Overhead Line Structure Revealed.
According to Real Time Trains, Taunton and Exeter St. David’s are 30.7 miles apart and a typical train takes twenty-seven minutes, so I’m fairly sure that a long enough electrified section can be created to fully charge trains, even if they speed through at nearly 70 mph.
Services
The BBC article says this about services.
David Northey, a retired strategic planner with Network Rail, said at a public meeting held in May, that the station would initially be served by trains every two hours as part of the Great Western Railway service between Exeter St. David’s and Cardiff Central.
However, he said this likely increase to once per hour as demand grows.
There are currently four services that go through the site of the proposed stations at Wellington and Cullompton.
- London Paddington and Exeter St. David’s
- London Paddington and Plumouth
- London Paddington and Penzance
- Cardiff Central and Penzance
Note.
- All trains have a frequency of one train per two hours (tp2h).
- There is a train every thirty minutes.
- All trains stop at Taunton, Tiverton Parkway and Exeter St. Davids.
If at some time in the future all services are run by battery-electric Class 802 trains, I suspect GWR will have fun working out an efficient charging and stopping schedule, which increases the number of stops at Wellington and Cullompton stations.
Thoughts About Electrification Through Devon And Cornwall
Distances
I’ll start by looking at a few distances.
- Penzance and Taunton – 162.3 miles
- Penzance and Exeter St. David’s – 131.5 miles
- Penzance and Plymouth – 79.5 miles
- Taunton and Exeter St. David’s – 30.7 miles
- Plymouth and Exeter St. David’s – 52 miles
- Taunton and Newbury – 89.6 miles
- Plymouth and Taunton – 82.8 miles
- Taunton and Paignton – 59 miles
- Taunton and Patchway – 51.7 miles
Note.
- Patchway and Newbury are already electrified to Cardiff Central and London Paddington respectively.
- Bombardier’s engineer told me eight years ago, that the battery-electric Class 379 had a range of sixty miles.
- Stadler’s FLIRT Akku has a Guinness world record of 139 miles on one battery charge. See this page on the Stadler web site.
- Even Stadler’s Class 777 trains for Merseyrail have a range of 84 miles on battery power. See New Merseyrail Train Runs 135km On Battery.
The rail distances in Devon and Cornwall are getting closer to being within the capability of trains fitted with batteries.
Station Stop Times
These are typical times that trains stop in the more important stations between Taunton and Penzance.
- Taunton – < 2 mins
- Tiverton Parkway – < 2 mins
- Exeter St. Davids – 2 mins
- Newton Abbot – < 2 mins
- Totnes – < 2 mins
- Plymouth – 11 minutes
- Devonport – < 2 mins
- Saltash – < 2 mins
- Menheniot – < 2 mins
- Liskeard – < 3 mins
- Bodmin Parkway – 2 mins
- Lostwithiel – 2 mins
- Par – 2 mins
- St. Austell – 2 mins.
- Truro – 2 mins
- Redruth – 2 mins
- Camborne – 2 mins
Note.
- The timings were for today.
- The Cardiff and Penzance services were being run by five-car Class 802 trains.
- Most station stops are around two minutes or less, but Plymouth on this train was eleven minutes.
I find it interesting that the Plymouth stop takes so much longer.
Train Stops At Plymouth
I looked at about twenty trains stopping at Plymouth, that included these services.
- London Paddington and Penzance
- Penzance and London Paddington
- Cardiff Central and Penzance
- Penzance and Cardiff Central
Note.
- I found an average time of eight minutes.
- Eleven minutes was a common stop.
- Eight minutes could be enough time for the rail equivalent of a Formula One splash and dash.
- CrossCountry services were going through the station in three minutes.
I am led to believe that the timetable used by the GWR trains would allow a quick battery charge at Plymouth station.
This OpenRailwayMap shows the platforms at Plymouth station.
Note.
- London is to the East and Penzance is to the West.
- Platform numbers increase from South to North.
- The two East-facing bay platforms are Platforms 1 and 2.
- The West-facing bay platform in the South-West corner is Platform 3.
- Platform 4 shares the island with the bay platforms 1, 2 and 3.
- Most trains going to Penzance use Platform 4.
- Platforms 5 and 6 share the centre island platform.
- Platforms 7 and 8 share the Northernmost island platform.
- Most trains going towards London use Platform 7.
- Wikipedia indicates that the track layout is comprehensive and allows a lot of operational flexibility.
Although the station was completed around forty years ago, it could have been designed for handling modern battery-electric trains.
- There are three bay platforms numbered 1 to 3, to charge local services and send them on their way.
- Trains can arrive and depart in the five through platforms, numbered 4 to 8, from either direction.
- Two days ago, a nine-car London Paddington to Plymouth train terminated in Platform 7. After waiting an hour it returned to London. An hour would be enough time to fully-charge a train.
- As many platforms as needed could be electrified.
I am fairly sure, that most battery-electric trains could be timetabled to leave Plymouth station with full batteries.
Turnround At Penzance
I have found these turnrounds.
- 802113 arrived from Paddington at 1142 and left for London at 1215
- 802022 arrived from Paddington at 1307 and left for London at 1415
- 802103 arrived from Paddington at 1500 and left for London at 1615
This OpenRailwayMap shows the platforms at Penzance station.
Note.
- The three example trains used Platform 1.
- Platform 1 is the long platform on the landward side of the station.
- Platforms are numbered 1 to 4 from left to right.
- An appropriate number of platforms would be electrified to charge trains terminating at Penzance.
Trains would appear to have plenty enough time to recharge, so they would start their return journey with full batteries.
Engineering Ambition
Several times in my life, I’ve got fired up about engineering or software projects and I like to think, I’ve produced the best and fastest solution.
For this reason, I believe that Hyperdrive Innovation, who are now part of Turntide Technologies, and Hitachi will set themselves three objectives with the design of the the battery packs for the Class 802 train.
- The battery-electric Class 802 will outperform the Stadler FLIRT Akku in terms of speed and distance.
- The battery packs will be plug-compatible with the diesel engines, so there will only be minor software modification to the trains.
- The train will be able to be handle all Great Western Railway’s routes without using diesel.
- I wouldn’t be surprised that on many routes the train will cruise at over 110 mph on batteries.
I also suspect they want the Akku’s Guinness world record, which will mean the range will be in excess of 139 miles.
Battery Range Needed For Routes
These are routes that need to be covered by battery-electric Class 802 trains or similar.
- Avanti West Coast – Crewe and Chester – 22.2 miles
- Avanti West Coast – Crewe and Holyhead – 105.5 miles
- Avanti West Coast – Crewe and Llandudno Junction – 65.5 miles
- Avanti West Coast – Crewe and Wrexham – 34.4 miles
- Avanti West Coast – Shrewsbury and Wolverhampton – 29.7 miles
- Great Western Railway – Penzance and Plymouth – 79.5 miles
- Great Western Railway – Plymouth and Taunton – 82.8 miles
- Great Western Railway – Taunton and Patchway – 51.7 miles
- Great Western Railway – Newbury and Taunton – 89.6 miles
- Great Western Railway – Taunton and Paignton – 59.0 miles
- Great Western Railway – Weston-super-Mare and Chippenham – 43.5 miles
- Great Western Railway – Oxford and Great Malvern – 65.6 miles
- Great Western Railway – Oxford and Hereford – 86.3 miles
- Great Western Railway – Oxford and Worcester Foregate Street – 57.6 miles
- Great Western Railway – Oxford and Worcester Shrub Hill – 57.2 miles
- Great Western Railway – Cheltenham Spa and Swindon – 43.2 miles
- Great Western Railway – Cardiff Central and Carmarthen – 77.4 miles
- Great Western Railway – Cardiff Central and Pembroke Dock – 118.9 miles
- Great Western Railway – Cardiff Central and Swansea – 45.7 miles
- Hull Trains – Beverley and Temple Hirst Junction – 44.3 miles
- Hull Trains – Hull and Temple Hirst Junction – 36.1 miles
- LNER – Hull and Temple Hirst Junction – 36.1 miles
- LNER – Middlesbrough and Longlands Junction – 22.2 miles
- LNER – Sunderland and Longlands Junction – 48.5 miles
- LNER – Lincoln Central and Newark Northgate – 16.6 miles
- LNER – Leeds and Bradford – 13 miles
- LNER – Leeds and Harrogate – 18 miles
- LNER – Leeds and Huddersfield – 17 miles
- LNER – Stirling and Inverness – 146 miles
- LNER – Edinburgh Haymarket and Aberdeen – 130 miles
- LNER – Peterborough and Doncaster via Great Northern and Great Eastern Joint Line – 93.7 miles
- South Western Railway – Basingstoke and Exeter St. David’s – 124.5 miles
- TransPennine – Hull and Micklefield – 42 miles
- TransPennine – Longlands Junction and Saltburn – 34.7 miles
- TransPennine – York and Scarborough – 42 miles
- TransPennine – Doncaster and Cleethorpes – 52.1 miles
- TransPennine – Stockport and Doncaster – 55.4 miles
- TransPennine – Stockport and Cleethorpes – 107.5 miles
Note.
- Stirling and Inverness and Edinburgh Haymarket and Aberdeen could be shortened by up to thirty miles, by planned electrification in Scotland.
- I have assumed that the TransPennine Upgrade has been completed.
- It looks like a battery-electric Class 802 train could use the Great Northern and Great Eastern Joint Line diversion via Lincoln.
- I am slightly surprised, that the longest stretch of line without electrification and with a passenger service is Basingstoke and Exeter St. David’s.
Charging will be needed at some places to charge the battery-electric trains. Stations fitted with chargers could include Aberdeen, Carmarthen, Cleethorpes, Exeter St. David’s, Hereford, Holyhead, Hull, Inverness, Paignton, Penzance, Pembroke Dock, Plymouth, Swansea, Taunton, Weston-super-Mare, Worcester.
Most chargers would be a length of electrification in the platform, where the battery-electric trains terminated or passed through.
More On LNER’s Ten New Bi-Modes
I wrote about these trains in LNER Seeks 10 More Bi-Modes.
This was my conclusion.
There is a lot of scope to develop LNER’s services.
I think it is likely that the order will go to Hitachi.
But as I indicated, I do believe that there is scope for a manufacturer to design a zero-carbon train, that was able to serve Aberdeen and Inverness.
-
- I suspect a fleet of ten trains would be sufficient.
- Trains would use the 25 KVAC overhead electrification, where it exists and hydrogen or battery power North of the wires.
The trains would also be capable of being upgraded to higher speeds, should the East Coast Main Line be turned into a High Speed Line.
I also think, that whatever trains are bought, there will be a large upgrading of the existing Hitachi fleet, which will add batteries to a lot of trains.
In the July 2023 Edition of Modern Railways, there is an article, which is entitled LNER Embraces Pioneering Spirit, which takes the form of an interview with LNER’s Managing Director; David Horne.
In a section, which is entitled ‘225’ Replacement, this is said.
Meanwhile, Mr Horne is looking to what might replace the InterCity 225 fleet, now smartly repainted in a scheme which pays homage to the original ‘Swallow’ livery. While there were fears this fleet may be withdrawn as an economy measure, the ‘225s’ are now on lease until at least next summer.
But Mr Horne says obsolescence issues are a real challenge and LNER will struggle to maintain the fleet beyond 2025, and from the May 2023 timetable change the number of daily diagrams was reduced from five to four to conserve the fleet’s mileage. Much of the heavy maintenance work had previously been carried out at Wabtec’s Doncaster site, but this facility is no longer available, and while a recent reliability improvement programme is bearing fruit, the challenges remain. The crunch point comes with the transition to ETCS at the southern end of the ECML as part of the East Coast Digital Programme – Mr Horne says LNER does not want to fit cab signalling on the ‘225s’.
The solution to this issue is to procure additional trains to run alongside the 65 Azumas, and LNER went out to tender in October 2020 for a fleet of 10 trains with self-power capability.
While a preferred bidder has been identified, the business case to proceed with the procurement is awaiting approval, but Mr Horne is still hopeful this project can be progressed.
The current plan envisages the new trains broadly replacing the ‘225s’ on Leeds and York diagrams, but a major benefit with the new fleet would be during engineering work – at present LNER has to withdraw services to places such as Harrogate and Hull to concentrate its bi-mode Azumas on services using non-electrified diversionary routes, and having more stock with self-power capability would ease the issue.
Currently, LNER has these Azumas and InterCity 225s in its fleet.
- Five-car bi-mode Class 800 trains – 10
- Nine-car bi-mode Class 800 trains – 13
- Five-car electric Class 801 trains – 12
- Nine-car electric Class 801 trains – 30
- Nine-car electric ImterCity 225 trains – 8
Note.
- There are 23 bi-mode trains and 50 electric trains.
- There are 167 bi-mode carriages and 302 electric carriages.
- Currently 31.5 % of the trains are bi-mode.
- With ten new bi-mode trains and no InterCity 225 trains, 44 % of the fleet will be bi-mode.
Is this increase in the percentage of the fleet, that are bi-mode acceptable?
I wonder, if there is a more affordable and flexible way to increase the fleet size.
In the Wikipedia entry for the Class 800 train, there is a section, which is entitled Traction And Generator Units, where this is said.
The Class 800 and Class 802 bi-mode are equipped with three GU per five-car set and five GU per nine-car set; a five-car set has a GU situated under vehicles 2/3/4 and a nine-car set has a GU situated under vehicles 2/3/5/7/8. In comparison, the electric-orientated Class 801 features a single GU for a five to nine-car set, which provides emergency power for limited traction and auxiliaries if the power supply from the overhead line fails. By adding or removing GUs, a Class 800 can be converted into a Class 801 and vice versa.
Let’s look at LNER’s needs, which are actually two separate sub-needs.
- There is a need for ten new trains to replace the InterCity 225 trains.
- There is a need to increase the size of the bi-mode fleet to be able to use the Great Northern and Great Eastern Joint Line and other non-electrified routes to by-pass engineering works.
Note.
- I suspect that as Mr Horne explained, there are only five or possibly four InterCity 225s diagrammed on a particular day, then perhaps ten five-car bi-mode Class 800 trains, might be able to cover for the retirement of the InterCity 225s.
- These trains would work as pairs to Leeds and York to replace the InterCity 225 capacity.
- If required they could split and join at Leeds and York to serve other destinations.
- The diversion route of the Great Eastern Joint Line has an unelectrified distance of 93.7 miles and the route is electrified at both ends.
- Would a battery-electric Class 800 train handle this distance? I suspect if Stadler can do it, then Hitachi and Turntide Technology will be able to do it too!
LNER will have replaced the InterCity 225s and acquired ten new five-car blockade runners.
As an order for ten new five-car battery-electric trains, is not to be sneezed at, I suspect Hitachi will make sure that their new battery-electric variants have enough range.
So this would mean that the range of a five cat battery-electric Class 800 train, should be in excess of 93.7 miles.
It should be noted that the five-car Class 800 and Class 802 trains have specific advantages when it comes to converting them to battery-electric trains.
- They are modern trains, that are still in production, every bit of information about the train is known down to the last nut, bolt and plastic clip.
- Like most modern trains, hey have a sophisticated computer system controlling the train.
- They have spaces for three, four or maybe even five diesel engines under the floor, which could be used for a battery-pack in every car designed to hold a diesel engine.
- The train has an electric bus between nose and tail.
- As is shown, when the trains change between diesel and electric, the pantograph can go up and down with all the alacrity of a whore’s drawers.
- The trains can be converted between bi-mode and electric, by adding or removing diesel packs. I doubt this feature will be removed, as batteries replace diesels.
With my Electrical and Control Engineer’s hard hat on, I doubt there is anything to stop a Class 800 or Class 802 train being fitted with three or more batteries to create a 125 mph train, with a range approaching two hundred miles on battery power.
The initial name of these Hitachi trains was the Hitachi Super Express. Is this train the Hitachi Super Battery Express?
But it would appear, that for their initial needs, LNER, just need a range to handle the near hundred miles of the Great Northern and Great Eastern Joint Line.
Inverness and Aberdeen will come later.
Hull Trains
This page on the Lumo web site is entitled Greener Travel Between Edinburgh And London.
These are the first three paragraphs.
A new, 100% electric rail service is to start running between London and Edinburgh with fares for as little as £14.90 in a bid to encourage greener and more affordable travel between the capitals.
Called Lumo, it will provide low-carbon, affordable long-distance travel for over 1 million passengers per year. Over 74,500 passengers currently fly between Edinburgh and London each month3.
And with single tickets between the capitals starting from just £14.90, Lumo will be a comfortable, convenient alternative to flying that is affordable for all. Some 60% of all single fares will be available at a cost of £30 or less.
I’m sure Hull Trains, who are owned by First Group like Lumo would like to position themselves in the 100 % electric low-carbon box too!
Currently, Hull Trains’s five-car Class 802 trains, run 88.6 and 72.2 miles using diesel on round-trips to Beverley and Hull respectively from London.
If batteries were fitted to their trains to give a battery range of around a hundred miles, Hull Trains could call themselves 100 % electric.
No new infrastructure would be required, but a short length of overhead electrification in a convenient platform at Hull station would ensure the train left for London and Beverley with a full battery.
The pictures show Hull Trains’s Class 802 train in Platform 7 at Hull station.
Penzance And Taunton
This to me is the key section as if you can run a battery-electric train between these two stations it allows so many of the services to be run using zero-carbon traction.
These are distances from Taunton.
- Exeter St. David’s – 30.7 miles
- Newbury – 89.6 miles
- Okehampton – 55.3 miles
- Paignton – 59.0 miles
- Patchway – 51.7 miles
- Plymouth – 82.8 miles
Note.
- I’ve added Okehampton, as I feel that if Dawlish had another encounter with Poseidon, Okehampton with its proposed Parkway station on the A30 could be the terminus for coaches to and from Cornwall.
- All would be possible with a battery-electric train, with a hundred-mile range, leaving Taunton with a full battery.
- Charging could be needed at Okehampton and Paignton.
What is needed is some form of charging in the Taunton area.
This OpenRailwayMap shows Taunton station.
Note.
- The station has four through platforms.
- All Great Western Railway services to and from Devon and Cornwall stop in the station.
- I feel it would be possible to electrify the station, so that all stopping trains could charge the batteries.
But the problem would be, that as typically trains only stop for a couple of minutes at Taunton, there may not be enough time to take enough charge on board.
This OpenRailwayMap shows the track between Wellington and Collumpton, between Taunton and Exeter.
Note.
- The black line is the railway between Taunton and Exeter.
- The blue arrow in the North-East corner of the map indicates the position of the proposed Wellington station.
- Collumpton is in the South-West corner of the map and has also been put forward for a new Collumpton station.
- I talked about the reopening of these two stations in Reopening Of Wellington and Cullompton Stations.
- The M5 to the North of Collumpton runs closely alongside the railway.
- According to Real Time Trains, it takes just under ten minutes to go the thirteen miles between Wellington and Collumpton.
This Google Map shows a section of the M5 North of Collumpton.
And this Google Map shows Tiverton Parkway station.
Note how the railway runs alongside the M5 to the West.
I feel that if the two new stations of Wellington and Collumpton are built between Taunton and Exeter St. David’s, then why not partially electrify the route, so that all trains would leave or pass through Taunton and Collumpton stations with full batteries.
- Going West the trains would reach Exeter St. David’s, Okehampton or Plymouth.
- Going East trains would reach Newbury for Reading and Paddington, and Patchway for Cardiff.
I believe that a battery-electric solution is possible, that would enable the decarbonisation of the Great Western Main Line all the way to Penzance.
An Aborted Trip To Cardiff
I got up early, this morning with the aim of spending a day in Cardiff looking at the progress on the Valley Lines and have a drink with a friend.
But the trip is off, as there are no trains to Heathrow and Reading on the Elizabeth Line, due to a shortage of staff.
There are also some gaps in the Great Western Railway service to Cardiff, for the same reason.
Is this to show sympathy with Putin?
SSE Becomes First Utility To Trial First Hydrogen Fuel Cell EV Van
hydrThe title of this post, is the same as that of this article on Hydrogen Central.
This is the first two paragraphs.
The low-carbon energy infrastructure company will be the first utility to trial the hydrogen-powered vehicle – and the first to put it to the test in real-life fleet operations by deploying the vehicle with SSE engineers.
The project will enable First Hydrogen’s team to gather data on fuel consumption, usage, and efficiency. The trials are being used to inform development of First Hydrogen’s Generation II series, currently in development, and will help enhance Total Cost of Ownership (TCO) data.
The deployment will take place in Aberdeen, as the city has some of the UK’s best hydrogen infrastructure.
The Mayor of London please note how being a hydrogen denier causes London to have more pollution.
Goodyear Releases New EV Tire For Electric Metro Buses
The title of this post, is the same as that of this article on The Buzz EV News.
This is the sub-heading.
The new Urban Max BSAEV tire was designed in partnership with heavy-duty transit bus manufacturer Gillig.
This is the first paragraph.
The Goodyear Tire & Rubber Company has introduced its newest EV-ready tire for buses and transit fleets. The new Urban Max BSAEV (bus service all-position) tire was designed in partnership with Gillig, a manufacturer of American-built heavy-duty transit buses. The Urban Max BSAEV is the first Goodyear tire engineered specifically with low rolling resistance for EV transit and metro buses to help extend range and handle the increased load capacity, the company says.
This is an idea that could roll a long way.
Does your EV have low rolling resistance tyres?
Airbus To Trial In-flight Auxiliary Power Entirely Generated By Hydrogen
The title of this post, is the same as that of this press release from Airbus.
Airbus UpNext has launched a new demonstrator programme to explore, on the ground and in flight, a new architecture for the generation of non propulsive energy through the use of hydrogen fuel cells.
On conventional airliners, the APU (Auxiliary Power Unit), a small additional engine that runs on traditional jet fuel, provides together with the engines the energy required to power a number of non-propulsive aircraft functions, such as air conditioning, onboard lighting and electric power for avionics. With this new technology demonstrator, led from its facilities in Spain, Airbus UpNext will replace the actual APU of an A330 with a hydrogen fuel cell system that will generate electricity. Known as HyPower, the hydrogen fuel cell demonstrator also aims to reduce the emissions of CO2, nitrogen oxides (NOx) and noise levels associated with a traditional APU.
New design features and integration techniques will also contribute to maturing the safety and operations of future hydrogen-powered aircraft and will demonstrate the stable operation of a fuel cell in-flight, including its restart.
This Airbus infographic describes the system.
This looks to be a well-thought out project and I suspect Airbus will learn a lot about hydrogen and how to use it.
I have some thoughts.
The Noise Factor
Reduction of noise is mentioned in both the text and the infographic, so it must be important.
Years ago, I remember a take-off from St. Lucia, where on the previous day, there had been an engine failure on the flight from London. This meant we were treated to the view of a rare site of a five-engined Jumbo Jet, as the next day’s flight brought in a spare engine on the spare mounting under the wing. Engineers then worked all night to put this engine on the previous day’s stricken plane, whilst we had an extra night in the Carribean.
When it eventually came to leaving, we were on the absolutely crammed-full rescue plane, which was an almost new 747-300.
I remember the plane being positioned at the very Western end of the runway and we waited a long time before take-off. From our position towards the rear of the plane, I couldn’t see if they topped up the fuel tanks but they may have done. The pilot then gave us the good news, that we would be going to Heathrow without the usual intermediate stop at Barbados to take on fuel.
We had no problems, but I suspect the airport’s neighbours on the island didn’t like the screaming noise of the APU (Auxiliary Power Unit) disturbing the peace, whilst we waited for take-off.
A hydrogen fuel cell-powered APU could have advantages in some take-offs from perhaps smaller airports. The plane would be towed into position for take-off by a battery-electric aircraft tug, with all aircraft systems running on the hydrogen-powered APU. When everything was ready, the first engine would be started by the power from the APU and then after all engines were started and everything was ready, the plane would take off.
It looks to me, that a hydrogen-powered APU and a zero-carbon aircraft tug, could work together to reduce pre-take off pollution, carbon-dioxide emissions and noise at airports.
The Inflight Restart
Two air incidents, illustrate the need for an inflight restart of the APU.
The Wikipedia entry for the flight describes the crash like this.
British Airways Flight 38 was a scheduled international passenger flight from Beijing Capital International Airport in Beijing, China, to London Heathrow Airport in London, United Kingdom, an 8,100-kilometre (4,400 nmi; 5,000 mi) trip. On 17 January 2008, the Boeing 777-200ER aircraft operating the flight crashed just short of the runway while landing at Heathrow. No fatalities occurred; of the 152 people on board, 47 sustained injuries, one serious. It was the first time in the aircraft type’s history that a Boeing 777 was declared a hull loss, and subsequently written off.
Wikipedia gives this as the cause of the accident.
Ice crystals in the jet fuel were blamed as the cause of the accident, clogging the fuel/oil heat exchanger (FOHE) of each engine. This restricted fuel flow to the engines when thrust was demanded during the final approach to Heathrow.
Suppose this problem had occurred earlier and shut the engines down in the middle of Russia. At the 40,000 feet, they were flying, they could have probably been able to glide into the nearest suitable airport and land without main engine power. But the APU would have been needed to power the aircraft’s systems like instruments and air-conditioning.
One of my favourite books is All Four Engines Have Failed by Betty Toothill, who was a passenger on BA 009 on the 24th June 1982.
The Wikipedia entry of the flight starts like this.
British Airways Flight 009, sometimes referred to by its callsign Speedbird 9 or as the Jakarta incident, was a scheduled British Airways flight from London Heathrow to Auckland, with stops in Bombay, Kuala Lumpur, Perth, and Melbourne.
On 24 June 1982, the route was flown by the City of Edinburgh, a Boeing 747-200 registered as G-BDXH. The aircraft flew into a cloud of volcanic ash thrown up by the eruption of Mount Galunggung around 110 miles (180 km) south-east of Jakarta, Indonesia, resulting in the failure of all four engines. Partly because the event occurred at night, obscuring the cloud, the reason for the failure was not immediately apparent to the crew or air traffic control. The aircraft was diverted to Jakarta in the hope that enough engines could be restarted to allow it to land there. The aircraft glided out of the ash cloud, and all engines were restarted (although one failed again soon after), allowing the aircraft to land safely at the Halim Perdanakusuma Airport in Jakarta.
In this incident, the APU would have been needed to start the engines.
These incidents show how important the APU is to safe flying.
Some might even argue that a hydrogen fuel cell-powered APU running on its own independent hydrogen supply would be preferable than an APU based on a small gas turbine using the same fuel as the main engines.
Riveting Television
I’ve just watched an episode of Fred Dibnah’s Made In Britain, which was entitled Mechanics and Riveters.
It was fascinating stuff, but how do you decarbonise an industry like the making of rivets without using hydrogen?
Eviation Still Progressing Even As Alice Remains Earthbound
The title of this post, is the same as that of this article on Flight Global.
The article is a full summary of the status of the Eviation Alice project and very much a must-read.
This article on Skies Magazine, which is entitled Eviation Announces New Order For Up To 50 Alice All-Electric Commuter Aircraft, also gives this information about the order status.
In addition to the latest order from Aerolease, Eviation has also received orders from U.K.-based regional aircraft lessor MONTE (30 aircraft), U.S.-based Cape Air (75 aircraft), U.S.-based Global Crossing Airlines (50 aircraft), Germany-based EVIA AERO (25 aircraft), Australia’s Northern Territory Air Services (20 aircraft), Mexico-based Aerus (30 aircraft), Air New Zealand (up to 23 aircraft), and DHL Express for 12 Alice planes in the eCargo configuration.
Whatver, your view on electric aircraft, the total of 315 orders is impressive for a start-up.




























