Is it this simple ?
I have identified my motor as the first one , and have found details on the second one as a replacement.
Is it this easy ? Fit motor two and the boat goes faster ?
Both Graupner speed motors
Nominal voltage 8.4 V
Operating voltage range 6 ... 12 V
No-load speed approx. 13,200 rpm
No-load current approx. 2.5 A
Current drain at maximum efficiency approx. 20 A
Stall current approx. 79 A
Maximum efficiency excluding gearbox approx. 63 %
Permissible rotation R
Case length excl. shaft 57 mm
Case diameter 37.6 mm incl. flux ring
Free shaft length 13 mm
Shaft diameter 4.0 mm
Weight 240 g
Specification
Nominal voltage 8,4 V
Operating voltage range 4,8 ... 9,6 V
No-load rpm 21000 min–1
No-load current drain 2,2 A
Current drain at max. efficiency 12 A
Current drain when stalled 90 A
Max. efficiency without gearbox 76 %
Length of case, excl. shaft 57 mm
Diameter 36 mm
Free shaft length 8,5 mm
Shaft diameter 3,17 mm
Weight 195 g