gblwy
Well Known Member
Hi,
I’m struggling with electrickery. Over a space of 10 years I have added minor electrical stuff to the plane and, as a probable consequence, I’m having intermittent problems with the trim, possibly in turn due to low battery voltage. The battery is new so I’m wondering about the old chestnut of Ducati Voltage Regulator which was also replaced some time ago.
There’s nothing wrong with the trim motor. It works fine on the ground with a charged battery.
My estimate of the worst case steady state electrical load is around 14A, close to the alternator’s reported max of 15A. Adding the landing light takes the load to maybe 17A, but only runs for a matter of moments.
I have conducted a ground run incrementally adding to the load and noting voltage and current. With minimal load the voltage is around 13.5 during warming up with maybe plus 4-5A current.
At peak load at 4000 rpm the voltage is nearer 12.8 and current around 0-1A. The trim motor is sluggish and I guess may stop with air loads.
Do these figures make sense?
Thanks...Keith
I’m struggling with electrickery. Over a space of 10 years I have added minor electrical stuff to the plane and, as a probable consequence, I’m having intermittent problems with the trim, possibly in turn due to low battery voltage. The battery is new so I’m wondering about the old chestnut of Ducati Voltage Regulator which was also replaced some time ago.
There’s nothing wrong with the trim motor. It works fine on the ground with a charged battery.
My estimate of the worst case steady state electrical load is around 14A, close to the alternator’s reported max of 15A. Adding the landing light takes the load to maybe 17A, but only runs for a matter of moments.
I have conducted a ground run incrementally adding to the load and noting voltage and current. With minimal load the voltage is around 13.5 during warming up with maybe plus 4-5A current.
At peak load at 4000 rpm the voltage is nearer 12.8 and current around 0-1A. The trim motor is sluggish and I guess may stop with air loads.
Do these figures make sense?
Thanks...Keith