Here's where the problem starts, the apparatus routinely RTH with 38% of battery capacity remaining, and will start the landing procedure when the battery dips below 10%, so if your antenna system is capable of out flying your battery, like the Titan is, your left with either playing it completely safe, and RTH with 38%, or doing some fuzzy math to try to get the most performance out of the apparatus, which is what got me in trouble in the first place. It's a delicate balance, trying to get the most performance out of the battery.
It's really not
fuzzy math. The remaining flight time is pretty accurate. If you fly with OA turned on, to limit full throttle to 30 mph, that is 2 minutes per mile. I use 2.5 minutes per mile because at zero minutes remaining, you are at 0% remaining battery, and Autoland has already kicked in at 10% remaining, adding more complications (OA gets turned off, descent begins, and full throttle will reach 40mph, sending the aircraft past you before you can spot it, unless you let off on the throttle!). Also, 25 mph return speed is a given, even in a moderate crosswind in OA.
So, by monitoring the distance away, you should leave 7.5 minutes for 3 miles away, 5 minutes for 2 miles away, and 2.5 minutes for 1 mile away. To land
before 10% Autoland kicks in, add 2.5 minutes to each of those times, as 10% remaining battery displays roughly 2 minutes and 15 seconds of remaining flight time. This also presumes that you smartly flew upwind on your outleg, and are downwind on your return. The closer you are, the more margin you have to dawdle, if you find you were too conservative. Lastly, descending is very flight time consumptive and slow, so while returning, make sure you fly back on a
glide path that will arrive just high enough above you to avoid all obstacles along the way, descending as you return, to less than 50 feet above, and well out in front of you, to land manually, after sighting the aircraft, preferably hand catching, as you guide it into reach above and in front of you, while smiling for the camera!
