Since OS is owned by greatplanes (Towerhobbies) I would assume the motors are rebadged something else. They already have several lines of BL motors through greatplanes companies and I would imagine that the OS line is to get the attention of the hard core nitro and gas flying people.
Funny story but a couple of years back I was at a big RC show and heard an interesting conversation. There was a single large scale electric out of about 150-200 gas/nitro large scale planes. The pilot took it up to the area where they start engines etc before moving on to the runway and taking off. He checked everything and gave a quick buzz to the props and stopped awaiting his turn. Meanwhile two other guys were making fun of him and why he wasted time with those silly electrics. They commented how he couldn't even keep it started!


I really had to hold back from falling off the bench I was sitting on laughing. So when it was his turn he throttled right up, moved on to the runway, took off, and had a great flight. He was the only one who didn't have engine stalls/issues at all. I never said anything to those guys but commented about their ignorance loudly enough to my father-in-law for them to hear. They wouldn't even look at me afterward since they had made such asses out of themselves. Other people around me heard what I said as well. I wasn't rude, just politely stated that they didn't know what they were talking about and how reliable electric is.
Anyway, when I first got into lipo I knew a Heli guy who was hardcore electric and converting large scale before anyone actually made kits for electrics other than the small stuff. He told me that in 10 years (about 5 years from now) that most large scale stuff would be electric.
I can see why, when I watch the struggles of those guys getting multi engine setup going correctly (even with regular gas motors) electric is the obvious choice. Surely you don't get the same sound but the props still make a nice buzz and are loud on the the large scale stuff.
I do see a lot more of the turbines in large scale too including turbo props at the local events now. To me that is very interesting too and the seem very reliable albeit expensive.