In most models it is known to connect a multi-motor it is necessary to make a connection considered simple between the battery, the esc and the receiver and thus everything will work.
When the model becomes more complex, many model aircraft find it difficult to know how all components should be connected. The model airplane considered complete are the multi-engines that are: the twin engine, the trimotor and the tetramotor.
The multi-engine is a model airplane that needs to have more than one electric motor to run. The electric motor is extremely practical for this type of model because the petrol or glow multimotors need to be regulated all electric equally with the same rotation. If the electric motor is not regulated correctly, this electric motor will work on all flights, so it is necessary to make a correct adjustment.
The electric motor need not evade the rule. Should be placed in the same rotation, otherwise the flight can be dangerous and unstable even more if subjected to large rotational differences. https://www.mrosupply.com/hydraulics-and-pneumatics/hose-reels/2517511_hp1125-4-325-c_coxreels/