Assuming that it will fit in the airframe, will any 5" fan work on an OS 77?

I have seen 5" fans for the 46 and 5 1/4" for the 91. I have no idea what to put on my 77.


Are some better than others (I'm sure SOMEBODY has an opinion............haha)?


More blades, more static, less speed, right? That's okay here. Just trying to put together my first DF Jet.




Thanks