Building a fixed wing drone. What size motor should I use?

An EDF retrofitted Parrot Disco. 40 km flight.
The plane I am building, I would like to see 100km range.
Being that it is a canard-glider, I think that will be achievable.
I don’t have CAD skills or 3d printer, so its being built the standard Pattern-mold-vacuum bagged composites way. So it may take some time….

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