10540 if that right engine was in your TB20 I know where you would be going ???
Down of course, but I never argued otherwise.
But I would still prefer a single PT6 over any number of piston engines.
BTW, my name is IO540 not 10540
BTW I bumped into our mutual friend this morning, wearing the full Col Gaddafi regalia (was clean so presumably he must have just washed it) off to somewhere warmer (and much more corrupt) in something fairly big with two PT6s