Dave T wrote:Probably the biggest advantage it has over a conventional twin, is you will not get the asymmetrical yaw induced by a dead engine. Probably less drag as well but cooling of the rear engine might be a problem.
Yes Dave the "push-pull" engine layout is much safer if you lose an engine at v1 or beyond. And, the loss of the front engine affects the performance to a lesser degree. The rear "pusher" engine is more efficient and thus provides more thrust if its running.
The drag reduction is a real bonus because it reduces the "flat plate drag areas" from 3 on the conventional Twin to just one on the Push-Pull designs. The conventional twin has drag areas on the left engine, the nose, and the right engine. The push pull has only the nose drag. With all other things being equal you can use a bigger cabin, and still fly at good cruise speeds while using smaller engines and burning less fuel. The Cessna 336 had only 195Hp per engine and the Cessna 337 with retractable gear had only little 210hp engines. Yet it had a fairly big cabin and good performance. One funny thing on the C337 was that they put a lot of gear doors on it to reduce drag at cruise. You could hear each gear door slap shut on initial climb after takeoff and you could feel the extra drag from the doors until they were all retracted. Overall it was a good safe and fun airplane to fly. It could also land and take off on some fairly short runways even with the small engines.
I have seen the Adam 500 up close and I would love to own one if they were available in a nice highly developed final version. Unfortunately, they're not.