The Castel C.310P differs from the C.310 by a longer and new wing, some spoilers, and an enclosed cockpit.
C.310P
Span: 46 ft
Max glide ratio: 22 @ 37.5 mph
Aspect ratio: 14.3
Min sink speed: 2.45 ft/sec @ 34 mph
Wing area: 146 sq.ft
Sink speed: 6.6 ft/sec @ 63 mph
Empty weight: 315 lb
Loaded weight: 510 lb
All Aero 