Well there are many parameters to consider (wing area, weight & wing loading, wing profile & ducting etc) but as far as the ducting is concerned I would keep the intake diam close to the fan diam (=69 mm), for fast jets you can reduce it a slight bit. As far as the outlet is concerned for the MF480 you don't want to go below 53 mm diam.
Have a look at the short discussion on
or buy like I did a copy of D. Juras' book.
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