Originally Posted by
Uplinker
At about 1:22 on the #18 video, you can see one of the rail rotors suddenly change angle in the rotational plane. Instead of being 180° opposite the other blade, it moves round to about 150/210° from the other blade.
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The only helicopter I have ever flown is a radio control one that I built - disclaimer - but this didn't look right to me, as if the lower blade was producing lift and the upper was not. Or the other way around, but I believe the TR pushes toward the boom. Maybe this is normal, but it caught my eye:
