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THis is an interesting new lightweight piano designed for portability. It's somewhat similar in concept to the Klavins Una Corda.
Keybird X1

Huh! I can just hear the service call. "Can I just bring it by and have you tune it while I wait?" The scaling might be fairly decent. i notice there is no crook in the tenor bridge. Single strings would sound very different, though.

David Klavins had already produced a similar kind of thing, the Una Corda Piano. I think not quite as lightweight and without the foldable aspect for fitting in the car. There are a few YouTube videos of it, with musician Nils Frahm.

Looking at the new Keybird X1, the action looks very conventional, and it makes me realise how truly forward-thinking and ingenious the designers of the Lindner pianos were, back in the early 60s. It was just that the materials let them down.

I remember a decade or so ago there was a 6 octave piano marketed with just two strings per note. It had a strange bar for a sustain pedal. Conventional action. I just can't remember the name. It retailed at £800 here in UK so was a cheap starter. Maybe it was called pianino?
It had an odd sound, two strings didn't sound convincing. I'd love to see this new attempt, one string would be a tuning delight....and who needs volume in a modern minihouse, which is all young people can afford around here. It might be great.....?
Nick

Re Lindner pianos...the materials and construction certainly did let them down!
I was tuning one once and the screwheads holding down the pressure bar started flying off straight at me. It was like having someone firing an air pistol at me! I went off them rapidly......
Nick

Such an excellent design. Thanks for sharing this, David. I have been wondering for the longest time when someone might wake up and do this? I would say the market has been asking for 20 years or more. With the destruction of middle class peoples everywhere, this will likely be the only acoustic option for the musician of the future. Large pianos and home service will be only for the rich..

Even for 69 keys, 50kg is astonishing, as is the price...my old Roland stage piano was 40kg with the stand. One string per note is interesting, though I think it would be nice to have 2 which could be marketed as "historic".

Reminds me of the Phoenix Carbiano in ways, though that instrument uses lots of carbon fiber (aka money) to make it full size and full power. It kind of gets me thinking, what if someone built a fiberglass framed piano with 88 keys but less strings per note to make it lighter and cheaper...

Wow! I've never had that happen to me! Nasty!

Would be very easy to tune with one strings and only 69 notes.