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Terry Mackenzie-Hoy

Mackenzie-Hoy is a consulting acoustics and electrical engineer – machoy@iafrica.com

The sublime to the ridiculous
14th August 2020 By: Terry Mackenzie-hoy

Ah, let’s have a few trick questions: (Q) What is the difference between a Cape Town MYCITY Bus and a fire on Guy Fawkes Day? (A) The Guy Fawkes fire only gets burnt to ashes once a year. (Q) When... 


Nondirectional geese
7th August 2020 By: Terry Mackenzie-hoy

I live in Pinelands, Cape Town. Somebody has to. Pinelands is dull. It is one of two suburbs in Cape Town that do not permit the sale of alcohol or the licensing of bars. If you want a good night’s... 


How to cure a hide
31st July 2020 By: Terry Mackenzie-hoy

These days, tanning a hide is an automatic process that generally involves chromium sulphate, a kind of salt, as the tanning agent. However, back in the days when there was no chromium sulphate,... 


Substation Time Bombs
24th July 2020 By: Terry Mackenzie-hoy

About five years ago, I made a policy decision that I would never go into an 1 000 V substation again unless it was maintained by a reputable authority. Most 11 000 V substations are worse than 400... 


Seriously misguided
17th July 2020 By: Terry Mackenzie-hoy

One thing feared by all production businesses is a sudden change in profit. ‘Production businesses’ are businesses which take a lot of materials and convert these into something else  – for... 


While Rome burns
10th July 2020 By: Terry Mackenzie-hoy

In 2019, commercial aviation used 90-billion US gallons of jet fuel, which is basically paraffin. This is 374 755 766 616 ℓ which, in Africa, is impela enkulu.   In November 2012, I wrote the... 


40 years on
3rd July 2020 By: Terry Mackenzie-hoy

Now it happens that, 40 years ago, I had just finished my university degree and was on my way to the South African Navy to spend two years as a guest of government. At that time, the state of the... 


Fantasy of the Greens
26th June 2020 By: Terry Mackenzie-hoy

I regularly communicate with a group of engineering types who are all power-[Unknown A1]  generation minded and we regularly write about how misguided the green movement is regarding power... 


Splitting Eskom into three
19th June 2020 By: Terry Mackenzie-hoy

On February 7, 2019, President Cyril Ramaphosa announced in his State of the Nation Address that State-owned power utility Eskom would be remodelled and split into three State-owned entities... 


The old blood
12th June 2020 By: Terry Mackenzie-hoy

There is nobody who will say that the new CEO of State-owned electricity utility Eskom, André de Ruyter, is doing a bad job. When he took over, Eskom was in a bad way. It was rife with corruption... 


Same taxi, different driver
5th June 2020 By: Terry Mackenzie-hoy

The following is from an article from the Seven Pillars Institute: “Some of the company’s personnel pocketed a brokerage percentage from suppliers, overloaded ships with personal cargoes for... 


All the help we can get
29th May 2020 By: Terry Mackenzie-hoy

I own a small consulting engineering practice with a staff of five. Our work is consulting in acoustics and noise control. We are not considered essential to any project (as, for example, the... 


Icarus
22nd May 2020 By: Terry Mackenzie-hoy

In mythology, Icarus was the son of Daedalus. The latter wanted to escape from the island of Crete and so used wax and feathers to build some wings for himself and his son Icarus. Daedalus warned... 


Bowling for Michael Moore
15th May 2020 By: Terry Mackenzie-hoy

Michael Moore is a famous film director, and one of the films he directed is Bowling for Columbine. The title refers to the true story that two students in their late teens – Eric Harris and Dylan... 


Prophets of doom
8th May 2020 By: Terry Mackenzie-hoy

I have before me an article from a newspaper published in Cape Town. The headline is ‘Worst fire season feared’. It goes on to quote whoever who as saying we should be very concerned and uses words... 


Painting lines on the workshop floor
1st May 2020 By: Terry Mackenzie-hoy

Sometime back, in 1994, when the new government had taken over, there was a great deal of backslapping and self-congratulation by new Parliamentarians and officials and settling in and stuff.... 


Virus stories
24th April 2020 By: Terry Mackenzie-hoy

I did promise not to write about Eskom and the virus. I can leave Eskom alone but, as to the virus, it is a bit like saying to Samuel Pepys, who kept a diary in 1665, at the time of the great... 


Tapping into our readers’ minds
17th April 2020 By: Terry Mackenzie-hoy

To write about State-owned electricity utility Eskom, the virus and government is boring. So, I am going to use this time to get our Engineering News & Mining Weekly readers to solve a few... 


Massive benefits of the virus
10th April 2020 By: Terry Mackenzie-hoy

Some time back – more than ten years – the economy was swimming along. I had five staff and one of them stopped me in the office and asked if she could have a word with me. No problem. She said... 


The more seriously good aspects of Covid-19
3rd April 2020 By: Terry Mackenzie-hoy

A very good aspect about the coronavirus disease, or Covid-19, is that I need not go to those very tedious meetings, which last three hours, during which I will be asked to advise on the project... 


Open letter to South African politicians
27th March 2020 By: Terry Mackenzie-hoy

Ah, yes, at last! When Martin Creamer agreed to publish this column, he requested that I avoid politics. And so I shall. This letter is addressed to all of you politicians, far left to far right.... 


The butterfly effect
20th March 2020 By: Terry Mackenzie-hoy

The butterfly effect is a terribly sweet observation that the fluttering of the wings of a butterfly can be the trigger for a massive destructive storm. Taking the power generated by the wings of a... 


Cape Town saves Eskom
13th March 2020 By: Terry Mackenzie-hoy

With regard to power from independents power producers (IPPs), Cape Town's acting mayor, Ian Neilson, is quoted in The Citizen newspaper as saying “The City is fighting for the right to buy cleaner... 


Climate change: Part 4
6th March 2020 By: Terry Mackenzie-hoy

Summary of previous columns: climate change is real, if only because, in Norway, large patches of ice have melted and given up artefacts. This shows that Norway has become warm enough to melt ice,... 


Climate change: Part 3
28th February 2020 By: Terry Mackenzie-hoy

Summary of previous columns: firstly, climate change is real, if only because, in Norway, large patches of ice have melted and given up artefacts. This shows that Norway has become warm enough to... 


Climate change: Part 2
21st February 2020 By: Terry Mackenzie-hoy

In last week's instalment of this column, I wrote that climate change is real, if only because, in Norway, large patches of ice have melted and given up artefacts such as iron arrowheads and tunics... 


Climate change: Part 1
14th February 2020 By: Terry Mackenzie-hoy

I have decided to write about climate change. I know that, even with that simple sentence, the knives come out, the pistols cock and an army marches against me. But do not fret, my merensky... 


Lies about Eskom and energy
7th February 2020 By: Terry Mackenzie-hoy

A whole new culture of reporting on State-owned electricity utility Eskom, climate and energy has arisen. This country has a number of good-quality, intelligent energy experts but, deeply... 


The bus that Tesla missed
31st January 2020 By: Terry Mackenzie-hoy

Every day, I read all the suggested stories from Google. I know that some story lines repeat day after day. There is always a story about climate change, Jacob Zuma, a bread recipe, living off the... 


Desirable school subjects
24th January 2020 By: Terry Mackenzie-hoy

Last week, Basic Education Minister Angie Motshekga said that select schools would be piloting subjects such as robotics this year and, if successful, the subjects could be rolled out to public... 


Becoming an acoustics engineer
17th January 2020 By: Terry Mackenzie-hoy

I am a qualified electrical engineer. There were 105 students in first year engineering when I enrolled at university (if you ask my staff, they will tell you this was shortly after the Manumission... 


The idle thoughts of an idle fellow
13th December 2019 By: Terry Mackenzie-hoy

There is a lot of gloom and doom about in this country. In the professional community of which I am a part (that is, architects, builders, engineers, developers, and so on) I ask: "How's business?"... 


Fake science
6th December 2019 By: Terry Mackenzie-hoy

In the film A River Runs Through It, we see a young Brad Pitt, acting as Paul Maclean, being home-schooled by his father, Reverend Maclean. Brad is told to write an essay. He does and brings it... 


Staring you in the face
29th November 2019 By: Terry Mackenzie-hoy

Wind power and solar power are not available all the time. Many assume that the interconnected power system it is some sort of system which has a huge storage dam full of electricity that is tapped... 


The World Cup
22nd November 2019 By: Terry Mackenzie-hoy

Years ago, Engineering News publishing editor Martin Creamer told me I could write about anything in this column, as long as it was not offensive. So, the World Cup rugby. Not the recent event, the... 


Hannover Fair
15th November 2019 By: Terry Mackenzie-hoy

"Come on Terence," said Harry, "don't you know about the Hannover Fair ?" "In Hannover, Germany?" I asked. 


2003 Cricket World Cup
8th November 2019 By: Terry Mackenzie-hoy

I was going to write about the latest offering from national government, the Integrated Resources Plan (IRP). This is the document that sets the way forward for the energy generation policy for... 


The dinosaur falls – Part 2
1st November 2019 By: Terry Mackenzie-hoy

In my last column, I wrote that State-owned electricity utility Eskom has been most comprehensively messed up. A combination of black economic empowerment, government incompetence, employee... 


The dinosaur falls
25th October 2019 By: Terry Mackenzie-hoy

State-owned electricity utility Eskom has been most comprehensively messed up. Stronger words apply . . . but anyway. Black economic empowerment (BEE), government incompetence, employee... 


Death of the small consulting practice
18th October 2019 By: Terry Mackenzie-hoy

I am not sure how much we are owed in total. This is 'we' as in my consulting practice. A figure of R1 030 000 springs to mind. Certain debtors do stand out. There is the dear old North West... 


Large storage batteries
11th October 2019 By: Terry Mackenzie-hoy

Before cellphones, the only rechargeable batteries were NiCad batteries, and they were not terribly good. There was a drive to come up with something better, and so the lithium-ion battery was... 


Outsourcing and insourcing
4th October 2019 By: Terry Mackenzie-hoy

The wonder of politicians is their extreme stupidity. Somebody once explained to me that rocket scientists know lots about rockets but not much about anything else. Knowing lots about one thing.... 


Power system stability
27th September 2019 By: Terry Mackenzie-hoy

Power system stability is the degree to which a power grid continues to supply power after an unexpected event. An example: he Zambia power system has a demand of about 1 900 MW. Thus, at any one... 


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