[hef19898]

Rolls Royce, the only company that ever made civilian super-sonic jet engines, for the Concorde, dumped Boom in September. So, it is not tha Boom doesn't have an engine OEM partner. They had, and that partner was not interessted beyond some initial research.

[masklinn]

Technically two other companies also did:

- Kuznetsov Design Bureau, now JSC Kuznetsov, designed the NK-144 which powered the Tu-144S

- Kolesov Design Bureau, now NPO Saturn, designed the RD-36-51 which replaced the NK-144 in the Tu-144D

Both are now under the UEC state-owned group.

[hef19898]

The aerospace industry of the USSR is something, isn't it? Fun fact, they used the metric system for everything, including flight controls. Was, aparently, quite a problem for all countries that continued to use Soviet aircraft after they joined NATO.