Not an expert (member of a community of armchair generals actually), but uprating an engine will increase power density at the expense of durability and some fu

Not an expert (member of a community of armchair generals actually), but uprating an engine will increase power density at the expense of durability and some fuel efficiency. They could build planes, attach an uprated car or motorcycle engine to the front, and point it at the destination. It might have a 90% success rate, which is sufficient.