I didn't find anything about Momentum bomb project in the forum.
In Chris Gibson & Tony Buttler's book "British secret projects: Hypersonics, Ramjets & missles" this project names "RAE Momentum bomb":
and "Vickers Momentum bomb":
What does it mean? And I have another question. Do you have any...
How many different airplanes carried bombs in their engine nacelles?
Both Martin Mariner and Marlin carried bombs or torpedoes in their enlarged engine nacelles.
Grumman S2 Tracker ASW airplanes carry sona-boys in the rear end of their engine nacelles.