Tesla's Cybertruck launch went off the rails when its 'armour glass' windows were easily smashed twice in a live test

FREDERIC J. BROWN/AFP via Getty Images‘Oh my f—ng God,’ Musk said after Tesla’s top designer easily smashed the truck’s windows. ‘Well, maybe that was a little too hard.’

Tesla’s new Cybertruck reveal didn’t go quite as smoothly as expected after its “armour glass” windows got smashed during a live test.

CEO Elon Musk unveiled the $US39,900 truck in Los Angeles on Thursday, and he got Tesla’s lead designer, Franz von Holzhausen, to test the left-side windows by throwing a silver metal ball at them.

After von Holzhausen smashed the front-left window with ease, Musk exclaimed: “Oh my f—ng God. Well, maybe that was a little too hard.”

“It didn’t go through – that’s a plus side,” he said.

Von Halzhausen then tested the back-left window, which also smashed. “Room for improvement,” Musk joked.

“We threw wrenches, we threw literally the kitchen sink at the glass and it didn’t break. For some reason it broke now … I don’t know why.”

Tesla CybertruckTeslaA rendering of the Tesla truck

Before the hiccup, in his opening remarks, Musk said trucks had “been the same for a very long time,” while images of conventional trucks flashed on a screen behind him.

A caption on the screen said “100 years of the same.”

The Cybertruck is made of a heavy-duty exterior shell made from “ultra-hard 30X cold-rolled stainless steel” and armoured glass, according to Tesla.

Musk took pains to show the Cybertruck as being unlike any other production passenger truck on the road, punctuated by a 100-cubic-foot cargo area and up to 14,000 pounds of towing capacity.

The premier Cybertruck variant can reach 60 mph in 2.9 seconds, according to Tesla.

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