What is shenyang j-13?

I'm sorry, but there is no publicly available information about the Shenyang J-13. It is possible that you meant to ask about the Shenyang J-31, a fifth-generation stealth fighter jet developed by the Shenyang Aircraft Corporation. If that is the case, here is some basic information about the Shenyang J-31:

• The Shenyang J-31, also known as the FC-31 Gyrfalcon, is a twin-engine, fifth-generation stealth fighter jet developed for the People's Liberation Army Air Force (PLAAF) and the People's Liberation Army Navy (PLAN).
• The J-31 made its public debut at the 2014 China International Aviation & Aerospace Exhibition, and its first flight took place in October 2012.
• The J-31 is similar in design to the US's F-35 Lightning II, with two internal weapons bays and stealthy features like radar-absorbing materials and a low-observable design.
• The J-31 is designed to be adaptable to various missions, including air superiority, ground attack, and reconnaissance.
• It is believed that the J-31 may enter operational service with the PLAAF and PLAN sometime in the 2020s; however, officially it has not been confirmed.