counter rotating props?

[garbubba]

I'm still searching for a motor for my '87 cuddy. Want a carb yammie, but since I have merc controls I'd settle for a 150 merc. I've seen a few deals with a pair of counter rotating props & it got me thinking.

If you had only one engine, why would it matter which way the prop spins? It would just torque in the opposite direction, right?

And then why are counter rotating engine generally cheaper? & prop's too?

Doug