Twin tails and asymmetric flight
I was looking at pictures of the Lockheed Electra today and was wondering what effect they have on controllability OEI. Would a twin tail or single tail aircraft have a lower Vmca? I can see that having a rudder directly in the slipstream of the live engine would aid directional control butbwhat effect would the extra drag of the second fin have?
I'm guessing that the costs outweigh the benefits or more aircraft would have them but would be interested in the exact explanation as to why.