Compliments on a very thorough question!
Firstly, with a radius of .655m, the swept area is 1.33 sq metres.
According to our current understanding of Physics (c.f. Betz), the maximum power that it is possible to get from that area, at an arbitrary 10m/s (a strong wind!), is about (at sea level, so you would get a bit less up there)
0.35 * 1.33 * 1000 = 464.6W
This is at an impossible 100% efficiency. At 7.2km/h, = 2m/s, this maximum drops to 3.7W!
0.35 * 1.33 * 2 * 2 * 2 = 3.72W
Also, your propeller seems very large, and the attack angle is also large. This means it will rotate quite slowly (c.f. apparent wind). It would therefore need to generate a lot of torque to be effective. This is not an efficient combination to use for generating electricity.
Finally a comment about speed and power - they are not the same thing. So what matters is how hard the system can overcome resistance from the generator, not just how fast it can spin when there is no power being drawn from it.
Hope some of that help you!