Help with ideas for student flight program

I am proposing a school enrichment program to train children who are interested in learning to fly r/c airplanes; the age group will be 12 to 16 years old. I need help determining the type of plane (r/c) gear and power system, the total system will be provided as a package for each student. Classes are two hours long and there will be twelve days of training. The first week (4 days) training will be on aerodynamics and aircraft flight controls and a little electric theory, flight simulators and building the plane. The next two weeks will be spent on the football field flight training. Classes will start at 9 am the last class will end after 3pm expected winds in the afternoon could be 15 mph.

Requirements for aircraft:

1. Easy to build, should build in less than 4 hours. (Instructor supervised)
2. Must be crash resistant (indestructible would be grate)
3. Must handle wind to 15 mph yet stable enough to train on
4. Ducted fan to keep fingers out of props?
5. Radio system must be full range (not the 300’ range jobs)
6. Battery should be NiMH not lipo, charger should be included
7. Total system should cost around $100 per student (not including simulator)

Any help, advice, you can give will be greatly appreciated.