RE: Brison 2.4 high throttle problem
I have the 2.4 with a Bolly wood 20-8. Turns that at about 7300. Also had a Master Airscrew 20-8 liked it too, it turned a bit faster, about 7500. A Master Airscrew 20-6 would be fine I think, nothing wrong with revving that motor a little. I might even try it my self.
In the past people used 18-10s on that motor, and Brison would recommend it.