Why not? Every homebuilder can make his own decission=or involve best L/D with low weight and costs...
(BTW=constant chord K-wing is simple for HBAs...)
Just to explain you a bit better my point of view....
The e-Glider idea is aiming to clubs and young or older private pilots.
Final result should be KIT of composite one seat "glider like" airplane with possibility to install electric propulsion. It should not be designed to one exact type of electric propulsion.
Maybe would be not bad to offer it like a pure glider (with done preparations for battery pack installation place, motor and controller holders, pre-wiring etc.) and make some recommendations about "tested" propulsion configurations.
Up to now seems to be not so hard challenge.... however real challenge starts with price and weight.
My dream would be to keep price of complete airframe arround 20K EUR (24-25K USD).
It means that airframe constructio should be simple. Materials are comming to be expensive, but even more expensive is human work.
If we consider actualy offered electric propuslion systems in our power range (arround 20 kW) we can get price from 10 000 USD (Aerolite system with 2 batteries).
Geiger Avionics or MGM system available in EU will costs arround 12-15K EUR (my estimation).
Builder experienced in electronics could probably make propulsion system for lower price (of course on his own risc and than he must convince inspector about safety of his system).
Is interesting to see how the weight is affecting final price.
Low empty weight can safe a lot of money on certification / registration proces and pilot requirements (price of pilot license, requested or not requested medical checks etc.).
However low empty weight is also increasing price of materials. Is practically impossible to make light airframe without to use carbon fiber. In this case is not possible to make some compromises as the e-Glider should be able to fly also in mountains and wave conditions. This is by the way another reason to make design with relativelly "short wings" and keep possibility to "sponsor" L/D with electric propulsion.
Where could be possible to save some money is simplicity of construction. Is really necesary to keep production hours as lower as possible.
Another ways how to save money... (just "self brainstorming").
- to use parts already developed (possible for example for control lines, control lines connections etc.)
- keep low Vne. Vne is affecting necessity of expensive flutter testing. Of course cannot be too low - that would affect safety. Optimal Vne is 180 kmph (100 kts).
- use of back parachute instead of ballistic rescue system? I prefer BRS to save pilot and whole plane but this again affects price and empty weight....
- ... maybe other suggestions?