Since you are only using about 2/3 of battery capacity, could you get by with a smaller battery pack. How much weight might that save ?
Allan, this is a very important question.
In addition to Jason's answer, you may want to read Dean's very informative and detailed post (reply #4) on the thread below.
http://stunthanger.com/smf/index.php?topic=19275.0We have to keep in mind that the 75% rule is there ONLY as it pertains to a reasonable compromise between battery weight (physical size) AND the number of use cycles until battery death (battery death defined in ECL as that point that the battery at full charge has < 90% of its original capacity). With the new high tech. batteries from quality mfg. like Thunder power and Hyperion you can expect between 150 to 200 cycles when keeping the drain per flight at or below 75%. When using cheap batteries at 75%, you can expect a much lower cycle rate ( some reports are < 30) and marginal reliability. This 75% rule of thumb does NOT address the overhead issue we have in ECL.
Battery OVERHEAD:
Please read Dean's excellent post carefully. We need to always factor in this issue of OVERHEAD when selecting our battery size. We need to focus our math at the end of the flight when the power draining maneuvers come just when our battery has only <30% of it's power left. I will have a complete E-Stunt article on this in the next (JAN/FEB) issue of PAMPA SN. ....... Until then, please don't let the quest to save a few ounces compromise the power of your system at the very moment that max power is most needed! Remember the watts needed is around 175 to 200 watts per pound to do our maneuvers cleanly. Compute this with the V and mAh you have left near the END of the flight and you will see what I mean.
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