The RCS 140 might actually be a hot engine for this plane. ALL UP with all mufflers, switches, extra battery etc it weighs 3 lbs. It swings a 16" prop and can deliver up to 14 lbs thrust.
It will hover and slow pull out an 11lb 1/4 scale sukhoi, just like my OS91 FS does with the UCD. So yes, it is a pound heavier and has a similar listed HP but the trust is much higher.
You would have balance issues but you could get 30 plus minute flights on the same fuel tank. LOL!!!!