I'm having trouble coming to terms with that statement, but I think it's just because we are thinking about this differently. I don't have any formal physics training or knowledge, but I do have 27 years of skiing experience, many of which I spent racing downhill and super-g in FIS and USSA events.
From this I can say that the more time you spend on the ground, with maximum surface area in contact with the snow, the faster you go. I understand that while in the air there is no drag between your ski and the ground, but even if you're really good at getting those arms down and knees up, staying tight in the air, you're going to lose speed without your skiis on the ground.
Anyway, most likely I am wrong and just don't understand why, but it seems to me that a properly waxed/tuned ski, when weighted down by the racer and gravity, actually provides acceleration enough to offset the lack of friction while in the air, thus being faster on the ground. I feel like everyone would be trying to blast off the lips/rolls/jumps IRL if it were faster in the air, rather than sucking them up and staying on the ground.
From this I can say that the more time you spend on the ground, with maximum surface area in contact with the snow, the faster you go. I understand that while in the air there is no drag between your ski and the ground, but even if you're really good at getting those arms down and knees up, staying tight in the air, you're going to lose speed without your skiis on the ground.
Anyway, most likely I am wrong and just don't understand why, but it seems to me that a properly waxed/tuned ski, when weighted down by the racer and gravity, actually provides acceleration enough to offset the lack of friction while in the air, thus being faster on the ground. I feel like everyone would be trying to blast off the lips/rolls/jumps IRL if it were faster in the air, rather than sucking them up and staying on the ground.