Oh, I see, it's the old "Let's impress the guys at work" thing!

Well, as they say, "If you can't Dazzle them with Details, Baffle them with B.S"

Just tell them that the engine will turn at 11.000 RPM with an 11x7 prop.

That means that for every revolution, it moves 7 inches of air.

So at 11,000 RPM It moves 77000 inches (or 6416.6 Feet) of air per minute.

Which, depending on the plane, equates to about 72 MPH (Faster in a dive)