Your flying a Jetster 20 with a .45 fan? Fan no too heavy? Not over powered? That would be good to hear, I test ran the Kolibri tonight and wow does it sound mean and is every bit of 5.5 Lbs thrust. Almost seemed a bit much for the Jetster but it weighs less than the the .25 powerplant and 5.5 Lbs is less than the 8 that your turbax unit would make. I should start gluing balsa this week.