I am planning the electronics for my 1/3 scale Fly Baby and I have a question about Current Draw. When you look at the specs on a servo it tells you the current draw at idle and at zero load travel. I want to know the peak draw so I can plan my receiver power distribution properly.

I stumbled across a website that had several sample "peak servo current tests" done with an oscilloscope. One of the samples used a HS-925MG servo and it showed a peak draw of 1700mA. I looked up the servo specs and I found the following:

Current Drain (4.8V): 5.3mA/idle and 400mA no load operating
Current Drain (6.0V): 6.6mA/idle and 500mA no load operating

Assuming the test was done at 4.8v it looks like the peak is just over 4 times the no load operating (3 times at 6v)

The servo I will be using is a 200oz servo and it draws 8mA idle and 800mA at zero-load operation. I will be using a 2100 LiFe 10C/30C Peak battery to power the servos (receiver will have its own battery).

Using the sample above I expect to have a peak current draw of 2400mA-3200mA per servo. If all 5 servos are activated at the same time (not including the throttle servo) I may be looking at 16000mA or 16A. At 10C my battery will deliver 21A (63A momentarily)

So am I over thinking this? Will my 2100mA-10C battery be up to the job? Am I missing something? I would also like to know the average draw so I can calculate how much time I can safely fly before the battery starts to get too low.

Anyone want to give this 20 year pilot some pointers on flying the big boys?

This is my first 1/3 scale - in the past with my 1/4 scale and smaller planes I did not worry so much about the draw but I was only using 98oz servos then. I worry about the 200oz servos and how much current they will use.