Aldo, at 20 lbs. the ducted fan would fly but would have marginal performance. I have built several Migs for Bruce Sanders and other customers as turbine aircraft. The switch to a trbine is easy with this model and Bruce at Century Jet can supply the parts and details of the conversion.The turbine Mig 15 will weigh about 26 lbs. and flys well with a 17 lbs. thrust turbine. Mike