Leistung

Kalkulation Solaris

Electric-Boat Drag and Power Calculator

Length of Hull 8 m (only used for calculation of Re)Wetted Area of Hull 2.20 m2Speed 3 m/sditto 10.8 km/hditto 5.83 KtsReynold's Number 24,000,000Coefficient of Drag 0.0029Drag 29 NPropulsive Power 88 WEta Propeller 90 %Eta Gearing 100 %Eta Motor 90 %Eta Motor Controller 98 %Battery Voltage 12 VCurrent 9 ACable Length 10 m (to motor and back)Cable Cross-Area 5 mm2Cable Resistance 0.0344 Ohm (Copper)Cable Voltage Drop 0.32 VCable Power Loss 3 WEta Cable 97.4 %Electrical Power (Motor) 109 WElectrical Power (Battery) 114 W

Input into red cells

This calculator is based on actual data of a rowing shell where there is very little wave-making drag. It is Reynold's Number compensated and thus is valid for any size of craft which has a smooth surface and is used at a speed where wave-making is small. Additionally fair lines are assumed, e.g. no immersed transoms.

Note: The spreadsheet contains a circular reference. This feature must therefore be turned on in your spreadsheet program.