Hi All
I just ordered two 3.7 and one 5.18 gearboxes from Aliexpress to mate up to a 550 80 turn brushed motor.
The 3.7 gearbox on the 80 turn motor( 5500 rpm @ 7.2volts unloaded) will 1486 rpm at the 6mm output shaft.
The 5.18 gearbox with give me 1061 rpm at the shaft.
If I change to 12 volts the 3.7 gearbox (2434 rpm) and with the 5.18 gearbox(1737 rpm).
At present I am running my Eileen and Helen fishing boat with straight 80 turn motors on 7.2 volts with 60mm 3 blade props.
I am only using 50% throttle for scale speed.
So one of the Helen’s is in for a motor change.
Harry
Ashley turn the heater on for me, it’s WINTER down under !!!!