In theory, yes. In practice the blades don't have enough angular momentum for this to work longer than a very short time, which is why the first step a pilot mu

In theory, yes. In practice the blades don't have enough angular momentum for this to work longer than a very short time, which is why the first step a pilot must take upon engine failure is to slam the collective down so the air flowing past the blades will keep them spinning in the same direction. Some helicopters with very heavy blades with lots of angular momentum have been built, but it makes the blades heavy which requires a more powerful engine which makes the whole craft heavier which means you need even more angular momentum...you get the idea. It's an engineering nightmare so it's atypical.