Thank you very much for checking my figures.The current measurement obtained on the 8A charger range with 1 kg load appears to be a mis-read (shown in red).
View attachment 207046
My guess is that I have inadvertently swapped the figures between the 2kg and 1Kg loads.
If this is so, the table should read:
Load - RPM - Amps
4A delivers 12V free of load
8A delivers 13.55V free of load
4A delivers 10.3V motor load - no weight - 88 rpm - 1.5 A
8A delivers 12V motor load - no weight - 104 rpm - 1.6 A
4A delivers 9V motor load - 1 kg - 60 rpm - 2.1 A
8A delivers 10.9V motor load - 1 kg - 80 rpm - 2.4 A *
4A delivers 8.7V motor load - 2 kg - 54 rpm - 2.3 A
8A delivers 10.3V motor load - 2 kg - 68 rpm - 2.8 A *
* bold results swapped.
I'll run the tests again, after cleaning up the gearbox.
My next post will show the gearbox dismantled.