Maybe we should allow them to have varying ranges of power. I'm currently making a medium weight jet that uses the largest jet engine, the BlastoBFE120. I can only get a limited amount of power from it. I can't even reach Mach 1. So, to increase the flexibility of such engines, we should allow for some degreee of performance customization. I'll post the plane in question sometime within the next dew days, maybe even hours.