Airforce101
Hi guys, I was just wondering:

if you are to plot the amps drawn from the battery against throttle input, what kind of graph would you get? Linear, hyperbolic, some wacky curve, ...?

I'm asking because in my transmitter (9XR), I can set a timer to go off to signal when to land. I can set it to a specific time and relate it to my throttle stick input. If I set it to 1 minute, then it will start beeping after 1 minute at full throttle, after 2 minutes at half throttle, after 3 minutes at 1/3 throttle, etc.. It basically calculates how much time you have left, depending on how you fly/have flown the plane. But to set it up, I would like some insight in amps vs throttle input, any thoughts on this?
My avatar is what I look like after a "landing"...
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LukeWarm
You are looking at it in the wrong way, energy consumption is the results of work being done. Going streight up at full throttle take 5 times the energy that a full throttle dive takes.

The energy consumption of the aircraft deals with friction, and building and looseing momentum; it is information like the weight, Air flow obstructions and the aerodynamics of the air frame. Anything that increases the load on the motor, increases the energy consumption . Anytime you’re flying and you hear the motor working harder, it’s because the plane turned hard, the plane accelerated, the throttle is in its faster settings, or the plane is climbing fast; these things all put more of a load on the motor. To put the max load on a motor, you must do a combination of several of these.

With experience, looking at you setup and battery size and how you fly the plane, you can get a good idea about how long the battery will last. When you feel it is getting close to that time, fly up wind. Soon as you feel the battery getting weak, cut the throttle and land it somewhere close.
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PhilDou
Set your TX to 'count up' and fly it like you plan on flying it.

Once you notice the power drop Luke was describing, land. Take whatever time is on the timer and subtract 1 min, then input that time into the TX and set it to countdown.

I'm kinda cheap, so I never want to deeply discharge my batteries. 3.5V per cell is about as low as I like to go. Since getting ER 9x, and doing what I described above, when the transmitter beeps I land, and check the battery voltage. It is usually pretty close to 3.5 volts per cell. But you can adjust the amount of time to subtract to suit whatever discharge value you prefer.

I've also noticed that's some applications don't work well with the TX% setting. helicopters, quads, 3D, and aggressive flying seem to favor the TXs setting.

That's just my 2 cents, and how I do it.
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