Silvite, there would be momentary points of various G forces, as with most any roller coaster, but not a more sustained time of G force as with Mission Space. It certainly will be a different experience for each individual as to how they handle it. I think I would be safe to say that if dad has ridden Roch n Roll, Thunder Mountain, and was okay, he would most likely be okay on EE also. MS, orange, is a unique 'animal' when it comes to G forces. The new green version does not have those same G forces though.