The other very important part of the system is the new Hartzell three-blade composite propeller, certified just last summer, which represents the second generation of composite design from legendary prop maker Hartzell. The new prop boasts a number of improvements over the first generation and is a natural on the SR22 (turbo or not). The blade material is now a combination of Kevlar and carbon, as opposed to the earlier all-Kevlar blades, allowing for a thinner blade section at the tips, greatly improving efficiency and even rivaling metal blades, which can be made quite thin at the tips. The co-molded steel shanks have better retention qualities than those on the first generation models, so they don't need secondary fasteners (bolts and screws on the previous model). Of course, the obvious advantage to the new prop is that it greatly cuts weight-the blades are 30 percent lighter than metal blades and overall the prop saves 14 pounds. But from my point of view the best part is that it really cuts down on vibration. The difference is very noticeable from the cockpit. With the Kevlar and carbon fiber prop, the airplane seems much smoother, especially on takeoff and climb-out, and the noise signature seems different too, smoother and slightly quieter, as well.