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Thanks once again Phil.
So, there's really no such thing as a "less than optimum" tail, other than a truncated ideal tail.
Not quite clear why the Dryden van works as well as it does, I'll have to accept "it just does" for now.
Looking at some percent drag reduction vs. percent of tail stuff, the Dryden van could have gotten to where it was (with 04" and 80" tails) with about an 18" (~15%) truncated template tail. A tail that short would only have drawn in 1". Could that really have worked? Wow...
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