[aerohead]

I put these tables together from the original streamline body of revolution table to demonstrate how the drag will vary as it is brought down into ground proximity as a half-body,then what happens when wheels are added,and finally assigning a drag value to the wake itself.
NOTE: These values are only valid for the 12% thickness streamline body,although how the value percentage changes as a function of truncation percentage will be common to all bodies.



Here is a 2-D flow drag table I morphed from two in Hoerner's book.Remember,it's not 3-D,but you can see the effect of gaps and attempts to 'cheat' the air compared to 'ideal' teardrop forms.



Here is a table for 'J-form' wing/strut sections.Cd for the section is at left,and Cd of 'missing' portion is within yellow area