Performance estimates of a Merlin-powered variant would have made it comparable to the Mosquito but the R-1830-powered prototype was able to achieve only 273 mph (440 km/h), making the aircraft unstable and prone to stalling.
Performance estimates suggested that a Merlin-powered variant would be comparable to the Mosquito, but the R-1830-powered prototype achieved a slower speed of 273 mph (440 km/h), making it unstable and vulnerable to stalling.