Heat sink designing problem for Drones
I have an AC powered drone in my lab, the drone itself should be lightweight, but because of the heat sink used in it, its very heavy, even reducing the heat sink weight by half would significantly increase its payload capacity.
Currently the heat sink used in it is a conventional parallel fin heat sink, made of Aluminium-6061-T6, it currently weighs a staggering 678grams.
I need to reduce its weight at least by half. I have read some research papers there I have got the idea of using other different types of fin designs, from which Inverted trapezoidal fin stand out along with (Aluminium+5% by wt Graphene) as the material, because it keeps the base plate temperature almost same while reducing the weight by 42%. But that is only when we consider the weight of the fins. If we consider the whole setup i.e. (fins + rectangular base plate) then the reduction in weight is only 12%. That just messes up the whole direction all over again, I am very confused, can anybody give me any idea or tell me if there is any better material with similar thermal conductivity while being lesser density, or maybe some other type of fin design, or maybe a total overhaul of te whole heat sink design, any type of ides is appreciated. Thank you!