I have only worked with single EDF units before. I am thinking about building a VTOL with 4 x 70mm EDF units. What electronics do I need? How many ESC's? How do I wire multi batteries and not over AMP/Volt anything? Basic idea attached for visual reference.

Take a look at the quad copters forums. They sell and explain how to build the boards that control and manage the motors. I have only read and thought of it.

You will start like a quadcopter and. Transition into A plane.

Rcgroups has more detailed forum.

Cheers

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All great questions that require a lot of research on your part. Have fun!

We will see if it gets off the drawing board so to speek. And yes, I am a 42 yr old kid who still daydreams

I think I will simplify this project a bit. I will scale it down and go with two fans. Sort of a copy of the V-22 Osprey with EDF's.