Frank, I guess I didn't write that very clearly.
When the instability passes he moves his head forward to the normal position. I'm guessing the stability probably comes from adding the weight of the head to the upper portion of the bike. Kind of like a spinning ice skater exends arms to reduce spinning rpm. Well, maybe there is a better example but I can't think of it right now.
In normal riding, adding a passenger transfers the trailing edge drag to the passenger making the driver more comfortable. Same thing with adding a fairing behind the riders head on the single passenger bike.
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Good design is simple. Getting there isn't.
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