Who ever designed that Howard 500 is right on!!  I used to be a line guy at Cirrus Flight Operations at the Anoka County Blaine Field where N500HP is based!!!  I used to have to get up on the wing of that plane every week and fill it up!  Airborn who owns the aircraft, their chief pilot Dave gave me a ride up in their Cessna Caravan.  Which currently has been totaled for a couple of years..no one was hurt.  But anyway, I thought that I would share that little bit of information.  The aircraft itself has 5000HP, won an Oshkosh award a few years back, and that tail number is ment to display the horsepower but you cant have 5 numbers and 3 letters.

MIKE