It's 1.3 oz difference. This setup must be awesome for 3d because I have never 3d'd before flying this plane . First time out I was doing harriers up and down the runway, hovering (2 mistakes high), and an experienced pilot showed me how to get into a very flat spin. Awesome. Unlimited vertical, etc. love it. The only thing I didn't like about the plane was that it was so delicate...

Jess