Junkers (OKB) TW-12

14 stage compressor, 5 stage turbine PTL engine with 12000 hp
also called NK-12

OKB TW-12 / Kuznetsov NK-12

The TW-12 was a further development of the coupled twin TW-2 engine 2TW2F, which reduction gear was insufficient for a Serial production. Initial TW-12 designs are already known from 1951 and seemed to have been picked up again in 1953-

Compared to the TW-2, the number of turbine stages was increased to five. Heat resistant Nimonic alloy allowed to increase the compressor pressure and the EGT of the engine. Engine efficency was increased by better blade mechanism, reduced tip clearance of the blades and cooled blades. The reduction gear was a completely new design as was thje planetary reduction gear.

The engine prototype was ready in early 1953 and the test cell runs showed good Performance and a reliable design. The TW-12 was the last engine design by the former Junkers Team in Russia and the Team left Russia after the successfull static test runs. Kuznetsov continued the work on the TW-12 since 1953 and put it in Serial production under the Designator Kuznetsov NK-12. Kuznetsov equipped three Tupolev Tu-5 Bombers with the TW-12 engines as the right inboard engine, while the rest of the aircraft was powered by AL-73 Piston engines. In February 1955 the Tu95-V2 was equipped with the NK-12 engine for test flights. The engne was used on the Tupolew Tu-95, Tu-114 and the Antonow AN-22 later.

Variants:

• 2TW-2F - original 12000hp engine based on coupled TW-2, aborted
• TW-12 - generally new 12000hp design based on 2TW-2F with 10880 hp
• NK-12 - first Serial engines of the TW-12 by Kuznetsov  with 12170hp
• NK-12M - improved thrust since Sep 1955, approved June 1956 with 15211hp
• NK-12MA - for Antonow AN-22 with AB-90 Props with 15211hp
• NK-12MV - for Tupolew aircraft Tu95K, Tu114, Tu126, Tu142, reduced Prop Diameter
•  NK-12MK - for Ekranolot "Eaglet"  with 13464hp
• NK-12MP - for Tu95MS rocket carrier, also Tu142M with 15000hp 
• NK-16 - further development of the NK-12 with 16000hp (also TW-16)
• NK-12ST - gas turbine pump applications

Technical Data:

Weblinks:

• SecretProjects.co.uk - Excellent Posting by PaulMM on Jumo 012 and Jumo 022
• Wikipedia.org - Kuznetsov NK-12 Story, Variants, Data

introduced Nov 1996, transfered Aug 2017
http://hugojunkers.bplaced.net/
contents last updated 30 Aug 2017