HI Shi Zhé,
now I think you will draw plants for the construction of an early prototype of your FF concept, very small because it will be more economic, it's important to show a real one.
exemple : Using air pressure to turn.
and for the fist simple one, you dont add the full transmission.
It's also our project for a simple type of ZZ (p, c or diabolo) engine.
On the Turbicone sujet (by Yves Sauget) i speak about thèse news concepts engines (FF, ZZ , turbicône and robiplan...) : they have the great spéciality to have the main pièce witch is moving in 3 D ....only few engines give this particularity !
we have to show to the world a fonctionnal
métallic prototype in each of thèse news concepts !
Raymond is full working on a métallic prototype of MPRBC and also a SAERE.
i think now we have to do that !
have a great day
friendly
Pascal