Ni-Mh battery failure
Discussion
Just had an old ish nimh battery lose all charge very rapidly resulting in a badly parked Twinstar 
Thought they should drop off slowly rather than fall off a cliff. Usually get 10 mins from a charge on this one, but at around 8 minutes it shut the motors down (after about 10 sec of noise change from the props) then 20 secs later all power to servos lost. It was in the final turn for a deadstick, all looking fine then it nosed in from 30ft. Wing requires a dose of exopy & tape now, it will fly again.
Thinking about this could I have a dodgy ESC? Best see what voltage the battery is now giving
Thought they should drop off slowly rather than fall off a cliff. Usually get 10 mins from a charge on this one, but at around 8 minutes it shut the motors down (after about 10 sec of noise change from the props) then 20 secs later all power to servos lost. It was in the final turn for a deadstick, all looking fine then it nosed in from 30ft. Wing requires a dose of exopy & tape now, it will fly again.
Thinking about this could I have a dodgy ESC? Best see what voltage the battery is now giving
Batteries are batteries and are affeccted by number of times used, charge rate applied, temperature (this can have a BIG effect on battery capacity), and a number of other variables.
I bin all my batteries every year and dont take any chances that way. Batteries are cheap and have a profound effect on the outcome of any flight.
I fly glow engines and have had an rx pack give up the ghost on a 1/2 fuelled plane resulting in a fly away over a very long distance, model hit the roof of a house which knocked out 6 or so tiles... could have been a lot worse.
I include a name and address sticker inside the model so that if this ever happens I can be contacted, because I'm a memeber of a club I have full insurance for this - I assume you do to?
I bin all my batteries every year and dont take any chances that way. Batteries are cheap and have a profound effect on the outcome of any flight.
I fly glow engines and have had an rx pack give up the ghost on a 1/2 fuelled plane resulting in a fly away over a very long distance, model hit the roof of a house which knocked out 6 or so tiles... could have been a lot worse.
I include a name and address sticker inside the model so that if this ever happens I can be contacted, because I'm a memeber of a club I have full insurance for this - I assume you do to?
ESC is a bec one so no separate reciever battery. I am a BMFA member so insured. Was a 9.6v 8 cell batery about 18 months old. No matter, I am binning the ECS, batteries & reciever (switching to 2.4ghz) My glow planes are on 2.4 with fail safe so shouldn't have to walk too far for them as they are bound with a throttle cut. Only my twinstar was on 35mhz
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