Would you not be better putting all that R&D money, time and effort into something than is fundementally more suitable...
One example, 17kg (with gearbox removed), 200hp, better fuel efficiency than Lycoming:
Or following Inodyns efforts:
Just food for thought...
Helicopters need an incredible power-to-weight ratio, so why not start with the type of engine that gives the best power-to-weight ratio?
Hope this helps
CRAN