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Quite agree Vy usually most sensible climb speed but it could just be on some types that Vy is less than VMini - which is why I said VMini+, with IMC being focal issue. Sorry wasn't very clear and too abreviated perhaps! You could argue VTOSS would be safest climb speed for IMC obstacle avoidance clearance being nearest to Vx (best angle), but that is almost always less that VMini.