thanks again RedGN .. that was some helpful info ...

i think that buying each piece separately would give me the ability to choose its specs. individualy .. for example i could choose a motor with a specific rpm .. and so on ..

for the stability .. our design is in the form of an equilateral triangle-shaped body .. which uses opposite moments from different motors to stabilize it .. the design actually requires 3 motors ...

so .. if i need 3 motors that generate a relatively strong thrust .. which motors would you recommend ? and also what battery and remote control should i use ?