Special 25 - The S-61 is hammered in terms of its high MMH/FH requirements and engine restoration costs. Parts costs are actually relatively low.
Note, the figures shown on Conklin's site are for fuel @ $6.50/gal. Since Jet-A has fallen a couple of bucks since last year, the current hourly figures for the 225, 92 and 61 are $2,217, $2,158 and $2,437, respectively.
I/C