Just-powering planes.
Though my Chipmunk is heavy at 8.5lb, giving a high wing loading, it does still fly well.
I started out with a OS 61 FX in it, now a 91 FX.
To save weight, GeraldO hits the nail on the head. It was my fourth plane, so I did nothing to save weight, and probably added some, but would say there is plenty of scope to save weight if you are willing to work at it.
Great plane though.