I was one of the last pilots to fly the B170 in Australia flying both the Mk21 and 31 with Air Express at Essendon in 1977. The 31 had toe brakes and bigger engines, 1980 BHP, the 21 had that funny hand brake system so favoured by the home country. We carried 4 tons at 130 knots. Had an oil system of 20 gallons per side and used 3 gallons an hour. 56 inches and 2800 rpm I think by memory were the figures on t/off. Had auto-coarse, electrical tail-wheel lock, rubber blocks for suspension, she would bounce like a whore, very odd. Auto mixture, ECB etc. I could go on but have to go to work in a nice simple Boeing. ( God bless the Yanks).