Good afternoon all, I know this is a a difficult question to ask but I’m hoping some knowledgeable people will be able to advise.
I have recently bought a second hand model with a twin motor setup. The motors in question are believed to be 775 type motors (not confirmed because they have no markings on) but going by can length and diameter they fit the bill.
Second hand nimh batteries (6v 4300mah) were given me with the boat, wired in series to give 12v 4300mah.
On testing the boat first time performance was scale, but very quickly performance dropped off untill eventuallly after 10 mins or so the boat struggled to make it back to shore.
On charging the batteries at home using a nimh charger set at 300 mah, one battery took an overnight charge, the other refused to charge on the nimh charger. After a few attempts of trying the nimh charger i switched to my lipo charger ( on nimh setting - set to 1amp charge) and successfully charged the other battery, or so I thought.
Second sailing of the model was exceptionally poor. Barely a minute or two before the model showed signs of slowing and eventually cutting out in the middle of the lake!
So to actually get to the point of my post, can anyone please give me some idea of how many amps these motors could be pulling in the water driving 35mm props?
Could one or both of the nimh packs be faulty?
What kind of performance should I expect?
Does anyone have experience using these motors and if so what setups do you have?
Regards Chris