[Seahawk]

It is a great design, near centerline thrust given the counter rotating props and excellent performance one engine out.

But, with all designs, there are trade-offs:

- Large tail area (empennage) with complex controls and large drag co-efficient. Design also needs to cool aft engine with inlets, adding to drag.

- Complex fuel system to feed for and aft engines.

- Noise and vibration if engines are not in sync.

- Cabin space can be compromised.

- Rough field landings can be tough without a tail.

I love the Skymaster, however. There have been adaptations, mostly in the experimental aircraft association.

Edit: Not a tremendous amount of cruise performance over a single, mostly in gallons per hour.