This Helicopter paper model is the Raven 4, created by Aliens Papercraft. Raven Helicopter 4 was designed as an additional model in a magazine article ABC 21st Century. When the author was making quite a free hand. The only limitation on the number of leaves went, simplicity of construction and time.
All those escaping from this model, (ABC 8/2010) have the opportunity now, when the author finally got to be accessible to others.
About this aircraft paper model:
Title: Raven 4
Difficulty: 1234 (5) 6789
Recommended print on 120 ~ 160g/m2 card paper.
You can download this papercraft from here: Aliens Papercraft - Raven 4 Helicopter Free Paper Model Download