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The frontal area is a factor but overall shape is far more influential. A wide front tapering to a narrow rear can be highly efficient. I can't remember the number but from 15kph upwards air resistance is the major factor. Sadly the more aerodynamically efficient an object is front on, the...

That is certainly a valid concern. It's the risk factor that I would be most worried about.

I could see the Iris being aerodynamically highly efficient and effective in dealing with frontal resistance but cross winds could be a significant concern. I don't know the coefficient rating. It would be interesting to know. The 750w would require registration, insurance and a licence. It may...