BPF:
Originally Posted by
Desert185 
Big Pistons Forever:
You are correct, although VMC has to be understood as part of the process. A good example of why you are making a good point is a 3-engine ferry takeoff in a Herc. 2-engine Vmca is 136 KIAS with high rudder boost and 166 KIAS with low rudder boost. Rotation speed is less than that, so there is a period of time when the loss of a second engine could result in a failure to continue controlled flight.
Even though I haven't flown a Herc since 1987, those speeds are still ingrained. Like I said above, Vmc has to be understood as part of the process.
Since I am type rated on the DC6 and L188 I am quite familiar with the 3 engine case and should add that Vmcg is also a very significant limitation, particularly for the L188. However I would suggest that these very specialized situations are not very relevant to flying a light piston twin during initial training for the Multi engine rating.
Any example to enhance understanding and transfer of knowledge to the student is relevant, IMO. I would rather impart related experience to reinforce the importance of Vmca (to include Vmcg, if applicable), and the relationship to Vyse/V2 speeds than parse the information. As usual, the devil is in the details.