[EricH]

Originally Posted by Molten

When it says comparable. It says that it is in respect to the danger of the blades. In reality, it really isn't saying much.

I have to ask: How do you draw that conclusion? Sorry, but I just don't see it. They just say, this is one example of a safe design, and we expect comparable ones. They don't say what it's in respect to, just that it has to be comparable. The design given is for a general propeller, that's it.