I tried to build a kind of R/C catamaran working with computer fans using an R/C car circuit (27 MHz). The original circuit uses 6V batteries but the fans uses 12V. To make the fans faster, I've given first 18V and once seen that nothing goes wrong, I've added another 9V to make the tension up to 27V. Of course a component couldn't resist and blew off. Here is the picture of the circuit :
As a result, I decided to rebuild a similar circuit with adequate component that would support up to 27V at least. So I'm asking here what are the components that I would need to build this circuit and if possible, I'd like to have a scheme of the circuit since I don't know much about this.