RE: The new H9 Sukhoi gets a BME!
My observations are based on my experience.
Me and my friends have 3 Sukhois with DA-85s, some with a 27x10 prop and some with 25x12 Air Model props.
I also have a Hangar 9 Extra 260 with a DA-100L on cans and an Aeroworks Extra 260 on DA-100 with regular mufflers.
I am not sure if your comments relate to the BME 102, but if they do, my experience shows the engine is not as powerful as the DA-85, DA-100 and certainly the DA-100L, which is the most powerful engine I have seen in that bracket so far. The DA-100L is providing me more power than the DA-100 on 28x10 or 26x12 three-blade. Both DAs are mounted on 35% planes ( 26 to 27lbs.) and I doubt very much the BME 102 can provide this amount of power on 26x10, which is why I mounted it on a light 33% plane (22lbs.).
Based on the manufacturer recommendations, I am running the BME with a 26x10 prop, which seems to be the right one in terms of getting a proper power curve. The same 26x10 is the break-in prop for the DA-85 which will develop it's full power on a good 27x10 or 25x12 three-blade, if you want to reduce the rip noise.
So far, my side by side flying comparison between the BME and the DA-85 shows a clear advantage to the 85 on MTW can, regardless of the minor weight penalty for the BME with regular mufflers.
The story is likely very different with the larger BMEs, such as the 115 or 116, which I understand develop a lot more power for the same weight.