Have a look at this fantastic flight demonstration of Francesco Zen with his Beechcraft C-45 during the Fly-In of Falcon Wings

Model data:
Scale: 1/5
Span: 3 m / 118″
Weight: 20 kg / 44 pounds
Engine: 2x Zenoah 38 cc
Kit: Ziroli project. Build and modified by Francesco Zen

Extras: The whole model is covered with aluminum sheet over the wood and composite construction.