I am on my third hatch using the LIttle Giant Still Air Incubator (Again, no fan).
The first time, we had 6 eggs in the bator, and only one of the six made it to pip the egg. And that baby didn't make it out of its shell. I think my students and I made many, many errors along the way (Including not having enough humidity).
The second time, after looking over our list of Goods and Bads, we set 14 eggs and 11 of them hatched.
This third time around, I am starting with a new group of students and a new Little Giant (we've added the automatic turner) and we will just have to see how it turns out for the eggs just went in today!
Hope that helped...a little.