How a jetpack design helped create a flying motorbike

At around the age of 12, David Mayman tried to build a helicopter out of

 fence posts and an old lawn mower.

Needless to say, it did not go well. His contraption didn't fly and he was made to fix the fence.

"I was brought up in a way that I guess challenged me scientifically... I was always told that nothing's impossible," he says.

Perhaps he got a bit ahead of himself during his childhood in Sydney, but as an adult Mr Mayman, has built innovative machines that really do fly.

After selling his online listings business Mr Mayman developed a jetpack, which in 2015 he flew around the Statue of Liberty

But, since 2018, he has been working on a different kind of project, one he thinks will have more commercial opportunities.

Called the Speeder, his new machine will be like a flying motorbike. It will take off vertically, fly at high speeds, but be compact enough to fit in the back of a pick-up truck.

Speeder is just one of many flying machine projects under way at the moment.

There are currently hundreds of EVTOL (electric vertical take-off and landing) aircraft in development, with engineers hoping to create a new era of cheap, quiet air transportation.

But Mr Mayman's machine is very different from those aircraft. Instead of being powered by batteries and electric engines, his Speeder uses four small jet engines, which run on aviation fuel.

That might seem like a step backwards in technology, but for the customers Mr Mayman has in mind, only liquid fuel will do.

He says the military, emergency services and the offshore energy industry want a fast, compact aircraft that can carry a significant weight.

For that, you need jet fuel, as it stores 20 times the energy of batteries for a given weight. Or in other words, to supply the power needed, batteries would be too heavy.

"If you want to carry a certain payload, and you want that aircraft to have a certain range and certain speed, the only way to do that with current technology is, with turbine engines." Mr Mayman explains.

Spider-Man No Way Home: Making the visual effects

The latest Spider-Man film No Way Home has made almost $2bn (£1.5bn) worldwide and is continuing to pack

 out cinemas across the world.

As part of a series looking at visual effects, BBC Click’s Al Moloney spoke to Digital Domain’s VFX Supervisor Scott Edelstein to find out how they made one of the key sequences of the film.

 

Reselling PlayStations keeps a roof over my head

 

A sudden drop in income, a mounting medical debt and a family to feed left Sheraz (not his real name) struggling to find another way of making money.

During the pandemic his wife lost her job as a beautician, and the government's pandemic support was not easily available to him.

So, he turned to "scalping" - an unfavourable term for stockpiling popular products and reselling them at a higher price for profit.

Many sought-after items are resold, including concert tickets, limited-edition trainers and games consoles.

While the general resale of football tickets is illegal, practically everything else is legal to buy up and resell.

Sheraz says he only sells to his friends and family to make about £250 extra a month, so that he can "slowly eat away" at a £50,000 medical bill.

But for a majority of resellers, scalping is big business - and they are using tech to give them an added advantage.

Online bots

A lot of electronics are in short supply because of a global shortage of semiconductor chips, which are essentially the brains of modern electronic products.

Cars, graphics cards, smartphones and games consoles have all been affected.

The PlayStation 5 - Sony's next-generation games console - has been particularly hard for many gamers to get hold of.

Some shoppers relied on leaked information from big retailers to predict when new stock might become available. But even those staying up until 03:00 excitedly refreshing a retailer's website would find the stock sold out in minutes.

Real shoppers were being beaten by bots.

Software developed by the scalpers can notify them as soon as stock is available from any of their target websites. Sometimes the bots can even automatically buy items.

The PS5 consoles were being snapped up by bots, only to be resold for twice the regular retail price of £450.

Meeting the scalpers

Jack Bayliss is a 24-year-old former investment banker who started reselling six years ago. His profit margins were huge - sometimes he would buy Yeezy trainers for £150 and sell them for up to £1,000.

He decided to quit his day job and start Aftermarket Arbitrage - a reselling company that teaches others how to scalp. Through subscriptions alone, Mr Bayliss says he has made £456,000 in revenue since starting the company 18 months ago.

For £30 a month, subscribers receive alerts as soon as the bots detect that a rare item is in stock.

The 1,200 subscribers are notified on the Discord app, and can quickly head to the retailer's website to snap up the item.

Asked whether scalping was fair, Mr Bayliss told the BBC: "If you look at any marketplace, if there is an arbitrage opportunity, people are going to capitalise on it.

"Why would you leave the money on the table?"