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Calculators And Convertors!

Speed Calculator

Enter distance and unit: Metres Feet Yards

Enter time: Seconds

Speed is (select units before calculating): Metres per Second Metres per Minute Kilometre per Hour Feet per Second Feet per Minute Yard per Minute Mile per Hour Knot

Speed Prediction

Propellor Pitch: mm Propellor RPM: Prop Slippage: % = Km/h Mph

Prop Slippage Guide Monohull approximately 25% Scale Hydro approximately 20% Rigger approximately 15%

Length converter

Enter length: in (inch) ft (foot) yd (yard) mm (millimeter) cm (centimeter) m (meter) = in (inch) ft (foot) yd (yard) mm (millimeter) cm (centimeter) m (meter)

Weight converter

Quantity: centigram decigram dekagram dram grain gram hectogram hundredweight [long, UK] hundredweight [short, US] kilogram lb, lbs long ton megagram metric ton microgram milligram ounce pound short ton ton [long, UK] ton [metric] ton [short, US] tonne		=	centigram decigram dekagram dram grain gram hectogram hundredweight [long, UK] hundredweight [short, US] kilogram lb, lbs long ton megagram metric ton microgram milligram ounce pound short ton ton [long, UK] ton [metric] ton [short, US] tonne

Current Calculator

Battery mAh:
Run Time: Hours Minutes Seconds = Amps

Volt Drop

Current: Amps Milli-Amps
Wire Resistance: Ohms Milli-Ohms = Volts, Volt Drop

Cell Pack Voltage

Nº Of Cells: = Volts

Cell Pack Duration

Battery mAh:
Discharge Current: Amps Milli-Amps = Seconds

Power/Resistance

Voltage: Volts
Current: Amps Milli-Amps
= Watts
= Ohms

Propellor Pitch

Prop Diameter: mm
Prop Pitch Ratio: 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 :1 Propellor Pitch = mm

Battery Voltage + Power Under Load

Battery Nº Of Cells: Voltage: Discharge Current: Amps Milli-Amps Resistance Of Cell: Milli-Ohms

Cell Voltage Under Load = Volts Pack Voltage Under Load = Volts Power Output Under Load = Watts

Motor R.P.M.

Boat Speed: Mph Km/h
Propellor Pitch: mm
Gear Ratio: None 2:1 3:1 4:1 5:1 6:1 7:1 8:1 9:1 10:1
Prop Slippage: % = R.P.M.

Discharger Design

Battery: Nº Of Cells Voltage Discharge Current: Amps Milli-Amps Use a Ohm resistor across the battery. With a power rating of Watts

Note: To gain a bigger power rating in a resistor you can put them into parallel, this with half the resistance and double the wattage. If for example you wanted 3.4 Ohms 50Watt resistor, you could use two 6.8 Ohm 25Watt resistors in parallel to get the same value.

Charging Time

Battery: mA/h A/h
Charging Current: Amps Milli-Amps
This battery will take hours to charge up.

Charging Current

Battery: mA/h A/h Charge Time: hours. This battery should be given a current of Amps.

Note: It is recommended that batteries are only given fast charges (below 2 hours) occasionally, as they do start to deteriorate with high charging currents.