Slow rotor,
off this topic, the djinn had a 11 m diameter rotor, 350 kg empty weight and was designed in the 60's.
just for numbers, do you know what would be the airflow needed to spin a 8 m diameter rotor at approx 350 rpm ?
I thik that atually, this could be done by using a centrifugal compressor with a 80 Hp engine.
Thanks