Recommended rear shape and/or ducting
 

I have the following project trike (4-seater, like an extended Polaris Slingshot, with 3 wheels to make it street legal as a motorcycle) and am working on the tail end.

http://ecomodder.com/forum/member-mi...ototypetow.jpg

I made that admittedly amateur sheet foam tail myself, but am curious if I, say, should be using a more or less aggressive tapering angle and also curious what I should do for the (now open) top. Any ideas?

Will post more pics at different angles when I get home.

more pics
 

If you can safely get up on the roof of the house,it would really help if we had images from above.

Is this a re-post?

And again here:

Worse than a fastback design?
http://ecomodder.com/forum/showthrea...tml#post517574

I even posted a sketch of it.
http://s184.photobucket.com/user/kac...ml?sort=3&o=46

Recommended rear shape and/or ducting? Here you go:

http://st.motortrend.com/uploads/sit...rdGT_21_HR.jpg