I've seen a 4-blade prop. conversion somewhere in these vast sources of information but now when I want it - it's not to be found.

Can anybody help ?

<What do you mean a conversion to 4 blades?  You want to make an aircraft with 3 blades that is already working in FS into a 4 bladed prop? >

Yes that's right.  No big deal about it. It's just that I remembered (or thought I remembered) somewhere
in going thru the material presented on  this site that somebody had listed a four bladed prop cpnversion and after looking for it again, and not finding it, I posted this querry hoping that someone would tell me where it was located