Like the Progress D-236, the more powerful Progress D-27 propfan engine is a contra-rotating propfan with eight front blades and six back blades,[50] but the D-27 has advanced composite blades with a reduced thickness-to-chord ratio and a more pronounced curvature at the leading edge.[51] An engine that was launched in 1985, the D-27[52] delivers 14,000 hp (10,440 kW) of power with 27,000 lbf (119 kN) of thrust at takeoff.[53] Two rear-mounted D-27 propfans propelled the Ukrainian Antonov An-180, which was scheduled for a 1995 first flight and a 1997 entry into service.[54] In January 1994, Antonov rolled out the first prototype of the An-70 military transport aircraft, powered by four Progress D-27s attached to wings mounted to the top of the fuselage.[53] The Russian Air Force placed an order for 164 aircraft in 2003, later canceled. As of 2013, the An-70 was still thought to have a promising future as a freighter.[55] However, since the propeller component of the Progress D-27 is made by Russia's SPE Aerosila, the An-70 was stymied by Ukraine's political conflict with Russia. Instead, Antonov began working with Turkey in 2018 to redevelop the An-70 as a rebranded An-77, so that the aircraft can comply with modern-day requirements without Russian supplier participation.[56]