Dan,
That seems about 10 Kts slow based on our experience. I don't have real accuracy, I flew to 8,000 ft density alt and ran at or near full throttle @ 2600 RPM into and away from the reported wind, and averaged the GPS ground speed.
I removed the metal Sensenich (sorry, I don't remember the pitch) and installed their Ground Adjustable Carbon Fiber prop on my wife's 160 HP 1989 built short gear, old wheel pants, sheet metal intersect fairing RV-4. I selected the short 68" diameter. I set the pitch to position 5.
It has nickel leading edges, is that metal enough? It climbs better and is faster, plus feels smoother. Marilyn takes off like a rocket. Could be partly because the plane is light & she weights about 108 Lbs...
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I love the CATTO prop on my RV-8 so much I'm upgrading to a 3 blade, but this adjustable thing has a quality all it's own.
I suggest you provide more detail and a picture of your friend's plane (we always love that). Search the archives. Find out if the throttle is wide open or partly closed to keep from exceeding 2600 RPM? Does it have a manifold pressure gauge? Those aren't just for planes with constant speed props anymore! You can figure out % of power with RPM and manifold pressure.