Hello, Keesje.
Quote :"...thrust reverse works very well for props but makes a lot of noise too. No thrust reverse after landing & electric drive to the gate would really make a difference in total noise pollution. Is there a smart way to use the electric engines as generators during roll out & use the energy to cool the brakes? Or would it be simpler to put on the APU before landing to provide power to a blower/compressor?
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1/- You can do away with reversers altogether, the props give enough drag in the Betra range ( you'll need to keep that one, if only for line-up ! ) and a 1500 m runway should be ample for your performance.
2/- I do not think that the brake cooling is that much of an issue : your landing speeds would be a lot lower than on an equivalent jet and it's not as though the brake temps would shoot-up immediately.
3/- Why not go a bit further and have an APU auto-start + auto switching to the APU generator after landing. As you'll need some cooling / temp stabilisation time before you cut the engines off, the transition from traction to wheel drive would be very smooth.
Now a few issues with the flight controls : at the speeds you're considering, a trimmable horizontal tail is the best choice --> The to-day position needs to be re-designed again.
The high-lift devices solution are still not very clear...and the roll control ? high speed aileron, spoilers, low speed ailerons/flapperons ?