Potential problem ~ Potential solution
OK, how about eliminating total power failure.
One solution is the incorporation of two engines.
Also, a simplistic reserve fuel system for two engines
I am not sure what market you are designing for Dave. Is it sport or military/commercial?
Any or all.
My thinking process has always been one of a top down approach. It is a reiterative process consisting of dreaming up the wildest concepts and then working down toward the detail levels, until an insurmountable obstacle is met.
The initial objective was similar to yours; that of building a safe recreational Ultralight helicopter, which could eventually be mass-produced. The SynchroLite was detailed to the point of starting construction. However, it became apparent that it would probably never be marketable. This is due to the fact that it's cost would be more than potential customers would be able, or willing, to pay. If interested,
this is an expansion of the thinking on this subject.
My interest then was redirected toward rotorcraft in general. What are the shortcomings of current rotorcraft and what might be done to minimize these deficiencies? IMHO, the
features embedded in the intermeshing UniCopter appear to be the answer for light rotorcraft, which are intended to perform in-flight work.
The interleaving configuration is a similar solution for medium and heavy VTOL transport activities.
Whatever comes about; active blade twist is mandatory for significant rotor improvements, and this is the current project.