[jhautz]

I am using a MM in my Xray XB8 on 5s and 4s depending on the situation and have no problems, it runs great, but I do run a fan on it in to help keep the little guy cool. Obviously I pull the red wire on the rx plug to disable the internal BEC and run the servo and Rx off of an external UBEC like everyone does. I am looking at ways to simplify wiring on this thing as the MM is at the back of the buggy and UBEC ans Rx is at the front so I'm trying to reduce the number of wires I need to run front to back on it.

I know the MM brains still run off of the MM internal BEC even when the red wire is pulled so the internal BEC is still functioning, but with just a very tiny load on it. My question is what would happen if I ran just the little 25mm fan on the MM internal BEC. The fan is a 5v fan that says .9W so that means it will pull around a .18A load at 5V. I'm sure running it on 6v would make that Watt rating a little higher and the amp rating a little higher, but its still a fairly small load of maybe .25A.

How much heat would this generate on the internal BEC if i ran just the cooling fan on the internal BEC power? Everything else would run of of the external BEC. Would I be canceling the effect of the fan cooling out by generating extra heat with the additional load on the internal BEC on these higher voltages?

I'm thinking about trying it so I only need to run a little wire around the side of the MM to the wire solder points rather than all the way to the front of the buggy just to plug th fan in.

What do ya think?