Vasyfan is making 250mm and 390mm monsters running over 70kg with up to 50kw, and eye popping amps.

In most cases you want high rpm to get the mass flow and high thrust numbers, yet you then have to have very strong blade mounts. In his case they are individually molded carbon fiber blades

https://www.vasyfan.com/en-gb/edf-plus

250 mm and controller close to a big Jetcat in prices.

Regards,