am I right in thinking in theory the 4 blade front prop would be oppersite either way round but would just give a different leading edge (assuming it fitted on)
Can't remember from the last time I removed mine but I think the back prop has to recess into the forward prop so that you can get the retaining nut on.
So basicaly it won't fit properly the worng way round, I am sure someone will be along shortly to confirm, but it looks right in the photo.