Inspired by another post asking about top speeds with jet engines.
What's the highest speed you lot have gotten a prop plane up to while flying straight and level?
The highest I've achieved is 698 mp/h, and that was with four T-3000s in push-pull configuration.
Go check my BR-2 Firecracker. It's the fastest prop plane i built. I built my own engine consisting of two T-1000s coupled to a turbine leading to 4 exhaust ports.
1200 with a racer I built