Russ,
I live about 3 miles from the end of the Santa Rosa airport main runway. The CDF (California Dept of Forestry) flies their fire bombers out of Santa Rosa so in the summer I see them alot. Up until a couple of years ago the had big twin engine recips and they would go over my house, pretty low and really laboring now they have what looks to be the same plane but with gas turbines , no problem for them they are at least 250 higher than the old planes but you know what! Nothing sounds as good as a big recip!!!
Rex