Supersonic with a propeller plane !

[Jukka]

Re: Supersonic with a propeller plane !

I have done several calculations. It could go M2.6 without payload. Only electric aeroplane can cruise at 120 000 ft or above....and rockets of course.

[Jukka]

Re: Supersonic with a propeller plane !

Swiss team is going to 80 000 ft with solar, but aiming later to 300 000 ft.

https://www.google.fi/amp/www.thelocal.ch/20161208/swiss-unveil-stratospheric-solar-plane/amp