BarShaker,
A 65 in both aircraft - obviously different actual engines, but the same type, and both in good heath (comps in the 70's). We are talking about a small engine with a 5.4-1 compression ratio here - the effect of a heavy metal prop over a light wooden one is really obvious. The inertia makes the compressions seem less when you swing (due to the flywheel effect), the throttle response is much slower and yes I really do believe the extra inertia keeps the prop turning in the air for longer than the wooden alternative.
Once stopped, my Cub, even a dive to VNE won't spin the prop due to airflow... (don't ask!)
Kingy