Once you decide on the position of your shoulders, the rear fairing tapers down at about a 4 degree angle. The bottom angle is usually up 8-10 degrees. With a scooter your wheelbase is longer than a motorcycle (62" vs 56") and your CG is lower and further back. Make the tail as long as you feel is practical for your situation. At 30" wide, a 5:1 ratio puts your total length at 150" or 12' 6".
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