US 11,807,376 B2
Method for rating a propulsion unit comprising a main engine and an auxiliary engine
Pascal Charles Edouard Coat, Moissy-Cramayel (FR); Jean-François Endy Bersot, Moissy-Cramayel (FR); Stephane Orcel, Moissy-Cramayel (FR); and Nicolas Jerome Jean Tantot, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 15/776,593
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Nov. 16, 2016, PCT No. PCT/FR2016/052978
§ 371(c)(1), (2) Date May 16, 2018,
PCT Pub. No. WO2017/085405, PCT Pub. Date May 26, 2017.
Claims priority of application No. 1561000 (FR), filed on Nov. 16, 2015.
Prior Publication US 2018/0370644 A1, Dec. 27, 2018
Int. Cl. B64D 31/00 (2006.01); B64D 27/00 (2006.01); B64D 27/10 (2006.01); B64D 27/16 (2006.01); B64D 27/24 (2006.01); B64D 27/02 (2006.01)
CPC B64D 31/00 (2013.01) [B64D 27/00 (2013.01); B64D 27/10 (2013.01); B64D 27/16 (2013.01); B64D 27/24 (2013.01); B64D 2027/026 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A process for rating a propulsion unit for an aircraft, the propulsion unit comprising at least one main engine and at least one auxiliary engine distinct from the at least one main engine, the at least one main engine configured to provide main thrust, the at least one auxiliary engine configured to provide auxiliary thrust, the process comprising:
determining a first distribution between the main thrust and the auxiliary thrust to obtain a first thrust of the propulsion unit in a first operating condition, the auxiliary thrust selected to be at least 5% and at most 65% of the first thrust such that, when the propulsion unit is operating in the first operating condition, the propulsion unit provides the first thrust that includes the first distribution between the main thrust and the auxiliary thrust;
determining a second distribution between the main thrust and the auxiliary thrust to obtain a second thrust of the propulsion unit in a second operating condition, the second distribution being a function of the first distribution, the auxiliary thrust selected to be at most 70% of the second thrust, such that when the propulsion unit is operating in the second operating condition, the propulsion unit provides the second thrust in the second distribution between the main thrust and the auxiliary thrust;
rating the propulsion unit based on the first distribution and the second distribution such that the determined main thrust of the at least one main engine for the first operating condition is a maximum thrust of the at least one main engine; and
manufacturing the propulsion unit based on the rating.