12-06-2011, 07:18 PM
That's easy. You will get exactly until the ESC cuts out due to low voltage! 
.
Seriously, it does depend on the day and flying style. If you get 16A WOT, you probably won't be flying at WOT for the whole time. If you are flying on a windy day, you will possibly be flying at a higher throttle setting than cruising around on a calm day. If the aircraft is a floating trainer or glider, you might spend some of the fligh time on idle. Obviously a 3D craft will work harder.
Having said all that, I figure a 50-60% throttle guess is reasonable. So assume that you'll be drawing 16A for take off and a couple of emergency spurts and 8A for the rest of the flight.
Not for the real info - an 1800mAh battery can sullply 1.8A for 1 hour, 3.6A for 30 minutes, 7.2A for 15 minutes or 15.4A for 7.5 minutes and be completely exhuasted.
You don't want to exhaust the battery - only go to 75% of those figures, maybe 60% for safety. Based on the average expected draw, plan you flight time from there.
Finally, start conservative with a few short test flights and measure how much is taken out then plot the threshold from there.
.Seriously, it does depend on the day and flying style. If you get 16A WOT, you probably won't be flying at WOT for the whole time. If you are flying on a windy day, you will possibly be flying at a higher throttle setting than cruising around on a calm day. If the aircraft is a floating trainer or glider, you might spend some of the fligh time on idle. Obviously a 3D craft will work harder.
Having said all that, I figure a 50-60% throttle guess is reasonable. So assume that you'll be drawing 16A for take off and a couple of emergency spurts and 8A for the rest of the flight.
Not for the real info - an 1800mAh battery can sullply 1.8A for 1 hour, 3.6A for 30 minutes, 7.2A for 15 minutes or 15.4A for 7.5 minutes and be completely exhuasted.
You don't want to exhaust the battery - only go to 75% of those figures, maybe 60% for safety. Based on the average expected draw, plan you flight time from there.
Finally, start conservative with a few short test flights and measure how much is taken out then plot the threshold from there.
Drew
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Built-up
Balsa: Commercial: Depron:
Great Planes PT-20 (modified) HK Hawk 80 Index 3
Indoor Thingy Skyartec Cessna 182
Katana X lite (in construction) UM SU-26 12"WS Shoestring (Plantraco)
HK Extra 260
and a Fox chuck glider converted to RC
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