Thank-you all for your responses.. But they weren't exactly what I was looking for.


I intentionally omitted airplane specifics because I didn't want the conversation to drift away into "I've got this (which isn't what you have but it might mean something)" type conversation.

I wanted a more scientific discussion. So.. Assume I have an engine on a test stand. There is no airplane.

If I change from a 11x6 to a 11x7 prop, what is the performance difference? Does it have more thrust? Would it yield more acceleration? or more top end speed? If I change just that one and only one dimension. What happens?

Does that make sense?