Re: Is a heartline roll on a B&M Flyer actually an inversion
Just to elaborate a little...
If you define lying on your back as not inverting, then pretzel loops on flyers aren't inversions either. At the bottom of the loop, riders are lying on their backs as well, but there's no dispute that that's still an inversion.
Having the riders parallel to the track (in a flyer) instead of perpendicular to it (everything else) may make it hard to think of how an inversion looks, so instead think in terms of the track itself inverting. During a flyer's heartline roll, the track flips around 360 degrees, creating an inversion.
If you remember some of the discussion involving X2 and the other 4Ds, it came to the point where inversions were defined by the track itself inverting, not the riders. Even if it seems odd to think of the riders as inverting on a flyer, there's no doubt that the track flips over and inverts. Therefore, the rolls are still inversions.