Mmm Ok I slowly start to get it.
On the PC-6, the low pitch stop is 9°30', so it's still producing forward thrust.
So, when entering into Bęta, the power lever becomes a correlation of blade pitch and Ng speed, exactly like the reverse, but with a minimised min pitch ( on the PC-6 I've read that -0°30' is the lowest angle ( Bęta angle ) that can be reached without entering into reverse.
Are there any experienced PC-6 Pilots there to confirm or correct what I said ?
Thanks so far guys