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Action Outdoors ltd Marine Marine Accessories Torqeedo Electric Outboards
Torqeedo Electric Outboards
Battery Charger for Torqeedo Travel, UltralightProduct no.: TORQ1127Battery Charger for Torqeedo Travel, Ultralight - Battery Charger for Travel 503/1003/Ultralight 403
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Spare Propeller for Torqeedo Travel 1003/1003cProduct no.: TORQ1917Spare Propeller for Torqeedo Travel 1003/1003c - Spare propeller for the Torqeedo Travel 1003 and 1003c.
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Torqeedo Cruise 2.0 RS Electric OutboardProduct no.: TORQ1201-00Torqeedo Cruise 2.0 RS Electric Outboard Product Code TORQ1201-00Torqeedo Cruise 2.0 R - The standard for powerful
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Torqeedo Cruise 2.0 with tiller controlProduct no.: TORQ1220-00Torqeedo Cruise 2.0 with tiller control Product Code TORQ1220-00 Primary power at affordable prices
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Torqeedo Cruise 4.0 RS Long ShaftTorqeedo Cruise 4.0 RS Product Code- TORQ1211-00 Torqeedo Cruise 4.0 R - The standard for powerful electric outboards
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Torqeedo Travel Outboard 1103cProduct no.: TORQ1103-00Torqeedo Travel Outboard 1103c - Suitable for Boats up to 1500kg/1.5tonnes, Batteries have a Capacity of 400Wh
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Torqeedo outboard motors
Standardisation of power is nothing new. It goes back to James Watt, who defined horsepower in the 18th century to demonstrate the performance of his steam engine. Since then, it‘s been measured uniformly in HP or, in honour of its inventor, in watts. And with that, everything should be clear, shouldn‘t it?
Not completely. It depends on where and how you measure. The most meaningful performance indicator of a drive system is propulsive power, which indicates the performance actually delivered by the motor to move the boat, taking all losses, including propeller losses, into account. This method has been used in commercial shipping for nearly 100 years.
For petrol and conventional electrical outboard motors the propulsive power is not normally revealed. Instead, less meaningful indicators are used, such as shaft power, input power or even static thrust.
That wouldn’t be so bad if the differences between the various power ratings were minimal. But they aren’t; they’re very large. The propulsive power of a petrol outboard with 4 HP shaft power, for example, is just 1 HP. How can the differences in efficiency levels of different types of motor be measured? We’ll shed some light on them.
Input Power
A drive’s power consumption. Often used as a performance indicator for electric outboards (current x voltage), expressed in watts or HP. Input power is not usually specified for combustion motors such as petrol outboards or diesel inboards. However, it can also be determined (flow rate of petrol or diesel x calorific value of petrol or diesel) and is also expressed in watts or HP.
Shaft Power
Power rating of petrol outboards, comparable with cars (torque x angular velocity). The rating is expressed in HP or kW but does not take propeller loss into account, which can vary between 30% and 80%.
Propulsive power
Performance indicator used by commercial shipping and Torqeedo (thrust x speed). The rating is expressed in HP or kW and takes all losses into account, including propeller loss, and clearly indicates the actual power delivered by the drive system for propulsion.
Advantage Torqeedo
Our focus on optimising propulsive power and our use of the latest technologies means Torqeedo has the highest overall efficiency on the market. That is, every Torqeedo drive converts its available battery power to propulsive power better than any other outboard. This is very important for electric drives because it means more power and range from limited battery capacity.
Overall efficiency levels of various outboards
Comparing the Power of Electric and Petrol Outboards: Torqeedo’s HP Equivalent
Electric motors can achieve the same propulsive power as combustion engines with significantly lower shaft power. The reason lies in the different torque curves of electric motors and petrol engines. While the torque curve of combustion engines features a prominent peak, with maximum torque being available only over a limited engine speed range, electric motors feature a much flatter torque curve with ample torque available at any engine speed.
This characteristic allows them to run substantially higher efficiency propellers – even in lower performance classes – than combustion engines. Propeller efficiencies in the lower horsepower class can vary by a factor of 3 between petrol outboards and Torqeedo electric outboards.
To make the comparison easy for boaters used to shaft power ratings of petrol outboards, we always compare the actual propulsive power of our outboards versus petrol outboards. On the following pages, a Torqeedo outboard specified as a "3 HP equivalent" provides the same propulsive power as a 3 HP petrol outboard – even though its shaft power and input power may be substantially lower.
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