Originally Posted by
chopjock
Ok a Class 1 profile takes about 12 to 15 seconds of "exposure" time to Vtoss. A Cat A profile takes about 30 seconds or more. If neither can survive a tail rotor failure during this time, then which is the lesser of the two evils? I would suggest a shorter exposure time...
Again, you're missing the point. The one you linked to showing a S-61 is a "clear area" profile. It needs a specified minimum distance of clear area to operate from. If there is sufficient distance available (such as existed at Penzance before Tescos built a supermarket on it), it would be flown. If not, from a shorter and confined area surrounded by high obstacles (such as Leicester City ground), it can't be flown because the required obstacle clearance or stopping distance can't be guaranteed and a landing following any loss of power would almost certainly end up in the stands.