When you say "stopped prop" are you meaning an engine malfunction in one of the two engines ???
Yes.
Most twin engine airplanes use propellers with variable pitch. This has two big advantages in a twin engine airplane:
1) If one engine quits, the propeller can be "feathered", and this reduces drag a lot (compared to a non-feathered prop)
2) An adjustable propeller allows the engine to produce optimum thrust at both the airplane's normal cruising speed AND at the much lower speed for optimum single engine clime (rate or angle). This second part is critical, since climbing on one engine is the most difficult performance challenge for a twin.
If we want a plane that can climb safely with one engine not running
and we want to use fixed pitch props
and we want to use these cheap engines that are heavy for their power output
and we want very benign single-engine handling (no significant "
minimum controllable airspeed"), then we have a very tight set of design parameters to meet. That means no novelty for its own sake, the design decisions have to pull their own weight on pragmatic grounds.
Maybe an asymmetric twin design can do that, and maybe it is something that an amateur could analyze and build.
