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Post by fiddlefly on Apr 12, 2011 1:40:24 GMT 1
Hey All.
A rookie super cub question here...
On my third day of flying, I twice had the battery just die mid air (propeller stops spinning)... a fellow flyer was able to save it both times with brilliant landing.
What I don't get is that I thought it is supposed to warn you before it just dies....
how are you supposed to avoid crashing if you don't know its about to run out and land safely?
Any thoughts as usual appreciated.
ff
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Post by flydiver on Apr 12, 2011 1:53:55 GMT 1
Read your manual and do a search on low voltage cut off.
Try NOT to fly until the battery quits-not good practice and is hard on the lipo. Set a timer if you need to. I did at first.
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Post by Dillzio on Apr 12, 2011 11:29:45 GMT 1
The motor cutting out IS the warning that the battery is about to die. It cuts out the motor, but because you haven't lost all power you still have control to bring it in for a landing.
Once the motor cuts out, you can cut the throttle all the way down to zero, then if you turn it back up the motor will start again. This will often give you enough time to bring it in at 1/2-2/3 throttle. As fly says, it's not good practice to fly until low-voltage-cutout, it reduces the lifespan of your batteries.
Best bet is to invest in one of the cheap little battery testers that plug into the balance tabs, then you can get a better idea of what voltage your battery will be at after how long flying, then you can work out your flight times. Ideally, you should stop flying before you drop below 3.6 volts per cell, i usually fly for 10 minutes and that gets me down to about 3.7 per cell.
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Post by ginginho on Apr 12, 2011 12:51:45 GMT 1
Once the motor cuts out, you can cut the throttle all the way down to zero, then if you turn it back up the motor will start again. This will often give you enough time to bring it in at 1/2-2/3 throttle. As fly says, it's not good practice to fly until low-voltage-cutout, it reduces the lifespan of your batteries. TBH, I wouldn't recommend this unless absolutely necessary (i.e. plane is likely to cause a hazard on it's current flight path) as the LVC on the stock ESC is woefully low and this will only damage the packs further. The LVC is provided so that control of the aircraft is retained without continuing to supply power to the motor. With a poor/old/small pack this has the potential of draining it even further and could then result with a loss of control, a much worse situation. Best practice, fly to a timer as Fly suggests, and learn to ensure that there is sufficient residual charge left in the pack so that it isn't degraded. |
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will
Flight lieutenant
Posts: 39
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Post by will on Apr 12, 2011 16:29:21 GMT 1
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