It fits in a standard parking space. I didn't experiment with different boattail lengths. I used the tailcone of a Questair Venture kitplane (a 350mph airplane nicknamed "the flying egg" for its short fuselage) as a pattern in designing my boattail and just sized a pattern for the Venture's tailcone to fit the back of my car. I have a small air inlet slit at the top of the nosepiece that feeds air to the radiator. The only time I have ever had any overheating problems was when driving 75+mph on a 95F day. No problems in normal driving, even when climbing up US25 into the NC mountains. One of the things on my list is to install a manually operated radiator door in the front of the nosepiece.
View of the front and the air inlet slot (at the front of the hood on the passenger's side).
