The Revolutionary Role of Hydrogen

Hydrogen has a history with aviation. What could be better. A gas that is so light. So easily produced and with no need heat it up. With a lightweight gas-tight bag and a fair amount of rope, balloon construction took-off. Literally. The proof that hydrogen gas could lift a balloon goes back to the 1780s in France.

Sadly, the downside of this gaseous element is its propensity to combine with other elements. In fact, where would we be without liquid water. On this planet, that most basic and prolific combination of hydrogen and oxygen. Not so much sadly but more luckily.

Step forward about 250 years and we have a different vision for hydrogen in aviation. If it’s combined with the oxygen in the air that we breath, we get nothing more noxious than water. Since, the other forms of combustion, that populate our everyday lives, is distinctly noxious, surely hydrogen has a lot to offer. Talk about downsides. Burning fossil fuels is distinctly unsustainable. Polluting the atmosphere.

This week, I was looking out to sea. At the English Channel (No name changes there, I see). Standing on the pebble beach at Budleigh Salterton. They ought to have an award just for that name. It’s a small seaside town in Devon. The towns cliffs are part of a World Heritage Site, namely The Jurassic Coast[1]. 

Forget the 250 years of humans flying, cited above. About 185 million years of the Earth’s history is for all to see on the Devon and Dorset coast. When we say “fossil fuels” what we mean is that we are living off the back of Earth’s history. Society powers modern life on dinosaur juice. Well, not exactly but plant and animal life from hundreds of millions of years ago. How crazy is that?

Hydrogen, on the other hand, is one of the most abundant elements. It’s everywhere.

Modern day dinosaurs (politicians and pundits) insist that we continue to exploit dinosaur juice until it’s all gone. That’s putting aside any concerns about returning all that carbon to the Earth’s atmosphere. Carbon accumulated over millions of years.

Hydrogen can be a clean fuel. The problem is that saying that and then doing it are two different things. There are complexities that come with using Hydrogen as a fuel. It might be reasonably easy to produce, in multiple different ways, but it’s not so easy to transport.

Producing leak proof systems for transport and storage requires innovative thinking. We can’t just treat it with the familiarity of conventional fuels. Whole new regimes are going to be needed to get Hydrogen from where it’s produced to where it’s needed.

Producing leak proof systems for aircraft is a challenge. Given the odourless and invisible nature of this light gas, accurate and extensive detection systems are going to be needed. If the gas is to be consumed by fuel cells to produce electricity, then there’s going to be a constant struggle against complexity and significant expenditures.

What is reassuring is that none of the above is insolvable. At this time in history, we have the materials technology and control systems that make Hydrogen a viable clean fuel.

[1] https://jurassiccoast.org/

Understanding Aviation Safety

The recent dramatic events in Toronto brought to mind the equally dramatic event of Air France Flight 358 back at the latter half of 2005. Then a large aircraft was destroyed but the crew and passengers got away without fatalities. The combination of bad weather and poor decision-making led to a catastrophic runway excursion.

I remember that the year 2005 shook the aviation community. There was a whole succession of fatal aircraft accidents across the globe. In Europe, Helios Airways Flight 522 was particularly tragic. Errors led to the crew suffering hypoxia and as a result the aircraft and everyone onboard was lost. In Italy, lives were lost as an ATR72 aircraft ran out of fuel and plunged into the Mediterranean Sea near Palermo.

West Caribbean Airways Flight 708 fell from the sky killing all on-board. Kam Air Flight 904 hit a mountain killing all on-board. In Indonesian, Mandala Airlines Flight 091 crashed. A few passengers survived but many people were killed on the ground.

I sincerely hope that 2025 is not going to turn into another 2005. However, I do take the view that there is a cyclic element to the occurrence of fatal accidents. We are often proud to be able to say that the time (number of years) between one cluster of aviation accidents and another grows as overall safety improves but we are a long way from zero-accidents.

The global aviation industry is an incredibly safe industry when considering how many passengers are carried every year. However, zero-accidents remain an illusion however it might be touted as the ultimate goal.

As safety practitioners try to be ever more pro-active in our safety regimes there’s inevitably a reactive element to aviation safety. The aftermath of the 2005 experiences led to ICAO holding its first high-level safety conference in 2010 in Montréal. There have been two more such conferences since. One in 2015 and one in 2011.

The results have been to push the aviation industry towards a more pro-active management of safety. It’s not just the industry. In cases, the regulatory weaknesses that exist in individual States has needed to be given attention.

Add all this up over the last 20-years and you would expect everyone to be pro-actively managing aviation safety. Sadly, that’s not the case as some States and organisations are still managing the transition to a more pro-active approach. Some are so resource constrained that they are more inclined to talk about aviation safety than to act upon it.

Regulatory weaknesses exist in some unlikely places. Additionally, with the fashion of the time being to cut “red tape” at every opportunity, more troubles might be just over the horizon.

I’d like to see a break between the association of what is regulatory and what is considered bureaucracy. The two are not necessarily the same. Regulation and standards are synonymous. And what we know is that there is no successful complex industry without standards.

Please let’s not wait for the next accident report to tell us what to do.

Toronto Regional Jet

The bubbling cauldron of social media is overflowing with comments on the regional jet crash in Toronto. So, far 2025 is starting as 2005. After a period when aviation safety results were admirably good, we now enter a period when events conspire to show us that we should never take aviation safety for granted. Obviously, the question gets asked – is this a statistical blip or is something more concerning happening?

As would be expected the Canadian air accident investigators are gathering data. No doubt there will be preliminary reports. Much evidence is available to help the air accident investigators determine probable cause. This evidence available includes a plethora of video footage. The ubiquity of the mobile phone has led to a situation where videos circulate on social media before they get into the hands of professional investigators.

Speculation on this major accident ranges from the Trumpian – I saw a video therefore I know what happened to the more considered comments about how well the cabin crew did in evacuating the broken aircraft under horrendous conditions.

Certainly, the landing appears to have been a hard one. The weather condition, as seen on the pictures doing the rounds, was windy but not stormy in the sense of poor visibility. Snow cleared from the runway. Surrounded by a landscape of white.

Luckly the aircraft slid down the main runway. That dissipated energy to an extent that most passengers were not badly hurt and therefore able to escape the wreckage. Another fortuitous part of the sequence of events was the absence of a fire at the time of evacuation.

I need to be careful in using the word – fortuitous. The investigators will put together the exact sequence of events but there’s no doubt in my mind that credit should be given to the good design of the aircraft. Generally, accidents and serious incidents are more survivable that people might initially think. This is NOT simple luck. Although, for individuals’ luck may play a part in their fate.

Structures and Cabin safety experts spend their working lives thinking about the – what ifs. The objectives set for aircraft designs maximise the opportunities for survival. Cabin crew can fly for a lifetime and never experience a catastrophic event. When they do their training kicks in, and lives are saved. My thanks are to all those who work tirelessly behind the scenes to ensure that aviation safety isn’t taken for granted. Those who do the serious business.

POST: Agreed. https://edition.cnn.com/2025/02/20/us/flight-attendants-safety-plane-crash/index.html

The Evolution of Air Traffic Control

Until civil air traffic started to grow the need for its control wasn’t the number one consideration. The pilot was the master of the skies. A basic “see and avoid” approach was taken. See another aircraft and avoid it at all costs. Note, I am talking about the early 1920s.

If you want a nice exploration of how it all started keep an eye on the site of the Croydon Airport Visitor Centre[1]. The first London airport was not Heathrow or Gatwick. No, there’s a stretch of grass, a hotel, industrial units and out of town shopping standing on the site in Croydon of the first London airport. 

Firstly, we can thank Marconi for the first radiotelephony. Providing a means for pilots to speak to airports enabled the development of Air Traffic Control (ATC)[2]. It got going out of necessity because there was limited space on the ground and many aircraft wanted to take-off and land.

Aerial navigation took off in the 1920s. A hundred years ago. WWII drove advancement in every aspect of technology. After WWII, the basic having been established, an international body was established to set standards for international flying. That’s where today’s ICAO originated.

Radar and VHF radio transmissions were the cutting-edge technology that enabled air traffic to grow. Radio navigation aids developed as did automatic landing systems. So, by the time the jet-age started there was a whole selection of technology available to manage air traffic. Not only that but the standards required for these systems to interoperate around the globe were put down on paper.

That legacy has served aviation remarkably well. Incremental changes have been made as new capabilities have been developed. Most notable of that evolution is to return elements of control to the cockpit. A traffic alert and collision avoidance system (TCAS) does just that. It provides a safety net.

What we have available to manage dense airspace and busy airports is a complex, highly interconnected, interdependent set of systems of systems and procedures that is not easy to unravel. Each part, in each phase of flight, plays its role in assuring safe operations.

News and rumours are that quick fixes are being demanded in the US. Responding to recent accidents and a perception that all the above in antiquated, a well know tech guru has been thrown at the “problem”. I shouldn’t be a cynic, as having a fresh pair of eyes looking at the next steps in the development of air traffic management should be good – shouldn’t it?

It’s my observation, as an engineer who knows a thing or two about these things, is that any simple solution means that the parties have not thought long enough about the problem. In this case there are no quick fixes. However, there’s likely to be incremental improvements and they will not come cheap. 

[1] https://www.historiccroydonairport.org.uk/opening-hours/

[2] https://www.historiccroydonairport.org.uk/interesting-topics/air-traffic-control/

Legacy, A Cautionary Tale

English is full of pithy phrases that echo through the pages of history. One of the greatest contributors to this phenomenon was Shakespeare. Lots of quips and quotes and snippets of wisdom come from his numerous plays (and other literary imitations).

The phrase or maximum that I have in mind is: “Beware of an old man in a hurry.” It’s not the only one on the same basic theme. My dad used to say that there’s “No fool like an old fool”. Honestly, as a child I had no idea what he was getting at. I guess it was to sum-up an observation of someone’s behaviour. It’s not a complementary saying.

There’re several ways of interpreting the “old man in a hurry” saying.

For one, and I’m just about to clock 65 years, the way the world seems is conditioned by the fact that one’s final moments are a lot closer than they were as an ambitious young man.

Another interpretation is that we might expect an older person, with more experience, will be guided to make better life decisions. However, in reality, the reverse is so often true.

I could go as far as to say that the “beware” part is to beware of imbedded prejudices and reduced peripheral vison that can come with age.

Doing a quick bit of research the source of this short English saying is not ancient wisdom from a Greek scholar or scribbling Roman sage. Not even a contemplative Medieval monk.

No, it’s a young British Conservative politician talking about an old Liberal. In fact, probably the most successful old Liberal that has ever graced Parliament. The one who left this county with the world’s biggest Empire. When he passed at 88 years, Britain was the most developed, most prosperous nation and biggest manufacturer the world had ever known. If we were ever to call to Make Britain Great Again, we’d call for an old Liberal. MBGA doesn’t exactly flow of the tongue. Anyway, GB (Great Britain) endures as a name.

The young British Conservative politician was Churchill’s father, Randolph, and the old Liberal was an energetic, fired-up Gladstone.

Can I now use “Beware of an old man in a hurry” as I reflect on the week’s News? Does President Trump see the world as a racing clock? Knowing that mortality looms. Knowing that any marks that are to be made need to be made – now. The “long-game” is for others to play.

When time is almost up the tendency to rashness can be understood. A lot depends on whether the subject of legacy looms large in the thinking of a leader. Through the millennia legacy has mattered a great deal to leaders.

Gladstone’s success was marred by the eventual destruction of the Party he led. He did transform government from a boys-club of privilege, at least in part, but the future of Ireland became his achillea heel. As a Liberal, he found building a powerful country didn’t mean granting privilege for politician’s and friends’ private businesses but ensuring that the working class were represented.

Trump’s haste, and lack of longer-sighted goals, appears real. Constitutions, democracy and the public good will endure. Mean-time hang on to your hats.

Challenges Facing Supersonic Flight

Congratulations go to “Boom” for their supersonic jet flight[1]. Civil aerospace hasn’t ventured into this space for some time. Breaking the sound barrier is not an everyday occurrence in the civil world. There may be an international market for such new aircraft as much as there’s a market for fast cars and expensive boats.

However, I do not think a supersonic flight is the future of civil aerospace. It’s not mainstream. The environmental objectives for the future of aviation are ambitious. Generally, that means getting people from A to B in as clean and efficient a manner as is feasible. That does not include going ever faster and faster.

This new aircraft type is likely to be solely made in America. So, it does fit with the current political direction of the administration in the US. A triumph of technology. President Trump’s instinct to get rid of rules and regulations may work in the favour of Boom. However, in the end, the deciding factor will be – will the international marketplace want such a new aircraft type?

I certainly recall amazing ambition of the people who brought us the Eclipse aircraft[2]. Small light jets were going to be everywhere. Like a Silicon Valley revolution for the aerospace industries. That didn’t happen as predicted because the economics didn’t stack up. I don’t recall rules and regulations being the problem.

Even so, BOOM technology will have a hard job meeting international safety and environmental standards. I seem to remember that’s not new for supersonic flight. Even if the advancements made improve noise performance, there’s emissions and contrails to ponder.

There is another consideration too. It’s the problem Advanced Air Mobility (AAM) is facing now. To capitalise on their capabilities, these aircraft technologies require the reorganisation (modernisation) of national airspace. Plus, agreement at international level[3].

Supersonic flight over the world’s oceans may get agreement. Supersonic flight over national territory is a much harder sell. Some fliers may pay to slashing their travel times on-route. Going round and round in a stack, waiting to land, with conventional aircraft all around, will soon dispel any excitement.

Good luck to Boom. If civil use is minimal, no doubt defence applications will be numerous.

[1] https://boomsupersonic.com/

[2] https://www.eclipse.aero/about/

[3] https://www.icao.int/environmental-protection/Pages/default.aspx

Speed

Daily writing prompt
Have you ever unintentionally broken the law?
View all responses

There was a plain envelope waiting for me when I came through the front door, on Thursday last. It didn’t look like the regular ones that are house bills, statements or unwanted advertising junk. Yes, I’m primitive. I’m still paper based, to a great extent.

When I did get to opening it, my heart sank a little. Now, I hadn’t seen one of those for years and years. Inside was a formal bold printed form. Simple question. Was I the person driving my car on such and such a date, in the place named? They got me. I followed a link to a site that held motorway pictures. These images had gone from my recollection but there they were in curated digital realism. Big electronic signs, in bright red, hanging over the M25 motorway saying 60 miles per hour. Trouble is the calculated speed on the form was not 60.

By a small margin of error, the indicated speed of my car was enough to trigger the plain envelope that was not a welcome addition to my correspondence pile. Unintentionally I’d broken the law. I say unintentionally because I’m in the habit of using the speed limiter on my car to make sure such occurrences don’t happen. On this occasion my lapse is almost certainly going to turn into the need to go on a speed awareness course. Never mind.

Question mark?

Daily writing prompt
If there were a biography about you, what would the title be?
View all responses

That not an easy one. There are titles that stick for the strangest of reasons. One for me is David Niven’s: “The Moon’s a Balloon”, which is autobiographical. Simple and captures an actor’s life being one of illusions.

Spike Milligan gravestone epitaph could be a title of a life story: “I told you I was ill…”.  Which sums up the unexpected and terminal nature of life. Not to take anything too seriously.

Douglas Adams’s Hitchhiker’s Guide to the Galaxy is a good source of inspiration. I could take: “So Long, and Thanks for All the Fish” and convert it into “Bye, and Thanks for All the Toast”.

There are a lot of titles that big-up their subject on the basis that book sales might be higher if the story is about untold struggle and marvellous achievements. Epic tales can be repetitive even if they are universal.

I don’t know if anyone has used it, but I have in mind the title: “What was all that about?” Imagining that my biography is published after I’ve past. Although, I doubt if such a whimsical publication would hit the streets in our cosmos.

The Future of High Streets

Traveling is great. There’s always something new to try. OK, I’ll add a caveat to that observation. There’s usually something new to try. What I’m focusing on here is our English urban environment. Whether that be the centre of a major city or a main street of a small town. Variety is the spice. Often communing from layers and layers of changes over decades.

What I can’t pretend is that all is well. There are well-known places that have cut out a specialist niche to thrive whatever the tidal wave of changes. However, even they are impacted by the trend for bland uniformity that the commercial world loves so much.

Yes, I might have a delightful afternoon in Oxford or Bath and think all is well. Then a stop in a less well-regarded city or town and the problems becomes clear. The shifting sands of our High Streets is leaving areas blighted by neglect or sanitised by unthinking development.

The function of the High Street is no longer that captured in Victorian photographs. The butcher, the baker and the candlestick maker. This Dickensian Street scene maybe nice to look at as a novelty. It hardly makes sense unless the intention is to preserve a museum like atmosphere.  

Our town planning can still be caught up a sort of Victoriana. Intent on preserving the line of shops that has existed since the traction engine replaced the horse. It’s nice to see, centrally placed, a traditional coaching inn, but even they survive as restaurants serving specialised cuisine or dusty antique shops.

So, what to do? I have a couple of themes. One is community identity. Another is facing the reality of the on-line world, and another is to bring everyday life back into centres.

Avoiding the bland mediocrity of modern design[1] should be up there high on the list. Future generations will castigate us we leave them such dull ordinariness as to make them look away. Every place has a story. It’s not a question of packaging that story up as a museum exhibit. It’s more a question of making a 21st century interpretation of a history.

Embrace the on-line world. It’s not going away. I don’t say hordes of flashing lights and screens the size of houses. No, let’s be a less crass. Free high-speed connections ought to be in the heart of our communities. Innovative thinking like portals[2] between centres offers opportunities. Even if these must be carefully managed. Connecting places creates new experiences.

There’s often a tussle between the wish to bring living spaces back to High Steets and the demands of the night-time economy. People make spaces work. That could be window boxes full of flowers or tables out on cobbled streets on a moon light night. What’s clear is that public transport, infrastructure, and affordable housing are a must.

More effort is needed to square this circle. Make sure a good life can be lived in a centre but at the same time it be welcoming to visitors. That’s tough for designers and planners but that’s where they should aim.

[1] https://www.prospectmagazine.co.uk/essays/42227/the-duel-has-modern-architecture-ruined-britain

[2] https://time.com/6977881/dublin-new-york-city-portal-temporarily-shut-down/

About Animals and Flying

Pigs do fly[1]. But only the more privileged ones. Yes, animals that fly are not restricted to those with their own wings. It’s true that the animal kingdom has been showing us how to fly long before powered flight took-off. Nothing more graceful than a bird of pray swooping and diving. We (humans) can’t match much of what they do with our flying machines however hard we try.

Birds long inspired great thinkers. They opened the prospect of human flight. If they can do it – why can’t we? Surely the right combination of aerodynamic structures and a source of power would solve the problem. Shocking, in a way, that it wasn’t until a couple of keen bicycle repair men and a smart mechanic persisted until they had a working machine. That was only just over a hundred years back.

So, today’s novelty News item[2] of a cat that didn’t want to leave an aircraft puts a smile on my morning face. For all the farm cats I have known, the story doesn’t surprise me at all. It’s the sort of situation where humans are almost powerless in the face of the preferences of a feline.

Naturally, the engineering staff of an airline will have a good look at where the cat has been in its wanderings. There’s always the remote chance for a rogue moggy to play with something they shouldn’t ought to play with. Even on a modern Boeing 737.

I used the word “remote” but there are definite cases of loose animals causing air safety hazards. Looking this one up, because it sits vaguely in my memory, I do recall a dog that crewed through electrical cables after it got free in a cargo hold. Now, however lovable and cuddly a dog maybe that’s a place that no one wants to be in.

Back in 2002, American Airlines Flight 282 approached New York’s JFK. It was a Boeing 757 that landed with chewed-up electrical cables. Crew members heard noises coming from the cargo hold and found that some aircraft radio and navigational equipment wasn’t working. A dog had chewed its way through a cargo bulkhead and attacked wires in an electronics compartment. 

A quick search reveals that there are more cases of incidents caused by loose animals than might first be thought. Animals are potentially hazardous cargo. Sadly, often these flight incidents are not good for the animals concerned.

One thing to remember is that a large aircraft, at flight altitude, is pressurised. That’s not at the air pressure on the ground (unless an airport is a long way up a mountain range). A dog with breathing difficulties is going to find an aircraft environment distressing. Dogs can be skillful escape artists. Myself, I’m not keen to share a flight with them.

[1] https://intradco-global.com/livestock-transport/

[2] https://www.thesun.co.uk/news/33273791/cat-causes-chaos-ryanair-plane-rome/