Pardon the dinosaur ruler. It was the only one in the house that has cm and in.
Click the thumbnails below to see full-size.Rager: 3.5 in, 8.5 cm
Spray: 4.0 in, 10.0 cm
Scout WC: 4.25 in, 10.5 cm
So based on the pictures, it looks to me like UFO will be about the same height as Scout Windcharger.