On Monday, November 14, 2016 at 7:54:51 PM UTC-7, Jonathan St. Cloud wrote:
I have seen a four bladed composite prop on a Pawnee. That Pawnee was pretty quiet and was used at a high altitude airport.


On Monday, November 14, 2016 at 5:49:26 PM UTC-8, wrote:
On Monday, November 14, 2016 at 6:17:20 PM UTC-6, Dan Marotta wrote:
YES! The 260 Pawnee with constant speed prop is ear shattering. When I

I think all of the Pawnees operating at Boulder may have 4 bladed props and mufflers as a noise concession. Mile High Gliding has the US STC for the Hoffman HO4/27BHM-185. Pretty sure it's wooden/composite construction.

Frank Whiteley