Ive had a similar issue with a 12Kg servo, and after a bit of thinking and testing power caps etc. i have decided to make a separate BEC that is man enough for the job. it turns out its not my esc cutting out its the reciver crapping out at low input voltage.
Why do some ESCs (mines an LRP brushless sphere) have such weak BEC circuits? Most recivers and servos are happy at 6V input. so why are BEC set at 5.4V (mine is) and why the silly thin wire!!! the current to the servo has to come all the way from the ESC on wofully inadequte wire. it makes no difference haviing manly servo wire if the esc wire to the Rx is thin.
And power caps... has anyone done the calculations on how much energy an Rx and servo need to stay alive for say 200ms while the BEC has a transient crap out? very large i say grrrrrr, power caps just take up space.
so come ESC people make some better BECs and the problem will go away
sorry for the rant but this has bothered me for while
Discuss....
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