chriss
Senior Heliman
Location: Sunny Florida
| Al
Start by getting the batteries broken in. Five or six gentle flights of say 7 or 8 minutes will do the trick...keep them cool.
Now, charge the batteries up to full. Set a timer for 5 minutes, go fly the way you would normally fly, if your bogging the motor, back off a bit. Stop flying at 5 minutes.
When you recharge the packs, make note of the pack that has the highest amount of power put back in (mAHr's). Your charger should give you this info.
Take that number and divide it into the capacity of the battery...either 6000 or 8000 mAHr.
Mutiply that number by the 5 minutes you flew for and then by a safety factor of 0.8 for that "I goofed, but only a little" flight.
This will give you a time you should be able to always count on as safe.
By way of example:
Lets say I'm using 8000mAHr packs and I flew for 5 minutes and recorded a maximum of 3300mAHr's back into the packs.
(8000/3300)*5*0.8 = 9.69 minutes.
This of course does not mean that you should forego watching the temps. You should still always make certain that those do not exceed their limits. 180 for the motor, 120 for the control and 140 for the batteries (all in degrees F). A quick auto every few minutes (especially when it's warm out) to check temps is a good idea. If anything is at the limits (or above) discontinue the flight. Never try to push things right up to those limits as temperature does not rise linearly. Rather it rises exponentially at those points.
Hope this helps
Chris |
