You listed a few more Lancairs overall, than I had.  I’ll go back and check my queries for any possible omissions later this week.  However, you only had 16 turbines.

Rick,

 

I did a search of the FAA registration database "model" for the text "IVPT" or "LANCAIR IVPT".  Their search method is such that if one used "IV", all the fours are counted including IV, IVP, and IVPT.  I only found 1 IVT (Mark's).  Also, if the search was for "LANCAIR ES"  I would also see things like "Moses LANCAIR 360" along with "LANCAIR ES". 

 

Note that your list includes Harry League's IVPT and he doesn't even have an engine yet so the searches you used may include many non-airworthy-certificated aircraft but registered N-numbers.  However, I don't know how you came up with fewer total Lancairs.

 

What database engine did you use?  I like the use of "codes" since that is probably more accurate than the stuff people enter in the textual "model" fields during registration.

 

I used:

 

 

I had less difficulty with the NTSB searches because the search field "model" entries were more accurate at reflecting what the airplane was..