Originally Posted by
ORAC
Still speculation as to whether the B-21 has 2 or 4 engines, let alone which type they are.
I think four engines in B-21 are more likely (B-2 has four, and one of the reason B-52 has (and will have) eight engines is the redundancy (both are strategic bombers) and "rudder authority" issues (in case of an engine failure)).
Originally Posted by
Asturias56
IF they are different its probably because the B21 engines have to fit in a stealth airframe and environment
From the available sources (like e.g.
Northrop Grumman B-21 Unveiling May Answer Lingering Mysteries | Aviation Week Network and
Air Force Unveils New B-21 Stealth Bomber After Seven Years in the Making - Defense One) one can learn that B-21 has been designed with modularity in mind and with the help of as many off-the-shelf components as possible.
I am sure US AF, together with Northrop Grumman and Boeing, have examined the single engine type option in both bombers and just wondered what the reason would be not to choose it.