Wind Arrow Wind Turbine Hot

Wind Arrow Wind Turbine

This is a robust turbine, designed with minimal parts to maximise durability. Unusually for small machines, the turbine features a motorised self-start system, which is designed to get the blades generating at lower-than-normal wind speeds. Every so often it kick-starts itself, to see whether there is any wind at all that can be used. The Air Dolphin is also one of the turbines being tested as part of the Warwick Wind Trials.

Wind turbines

Swept area

The WindArrow has a blade diameter of 2.12 metres. This means it has a swept area, or capture area of 3.53 square metres. This is all important when comparing wind turbines, since it directly relates to the amount of passing wind energy the turbine blades can intercept.

WindArrow power output curve

The graph below shows the power produced (in watts) for the WindArrow at different wind speeds, based on data supplied by the manufacturer.

The green line shows the actual output that the wind turbine achieves at the given wind speed, according to the manufacturers.The dashed line in the graph shows the theoretical maximum energy that this turbine could extract from the wind, according to Betz's Law (59.3%). At a typical wind speed of 5 m/s, the WindArrow is extracting 86 Watts of power from the wind, which is an efficiency of 31.69%.

If you want to install a wind turbine, it is very important to measure how much energy you might produce.
Learn more about the Power Predictor

How efficient is the WindArrow?

Wind turbines can only convert some of the energy in the wind into electricity. The graph here shows how efficient the turbine is across the range of wind speeds you might get.

The orange line in the above graph shows the efficiency ranging from 0 to 1. The grey line is the previously mentioned maximum efficiency - The Betz Limit. If this limit is exceeded, the manufacturer's claims are not to be trusted!

While these graphs give an indication of the instantaneous power and efficiencies you might expect from the WindArrow turbine, working out annual power production is more complex.

Read more about the Power Predictor

Power output
The Wind Arrow has power generation beyond 20mph. Unlike other turbines, it does not shut down at higher wind speeds and tilts instead by using its Active Flight Control.
The cost we have here is based on the price in Canadian dollars. The manufacturer quotes C$2995 for the turbine and C$529-C$1650 for a compatible tilt tower.
Blade diameter
2.12 metres
Rated output (W)
5 years
24 Volt • 48 Volt
True-North Power NG
Noise levels
virtually silent
Comments (1)Add Comment
written by John Sharp, August 19, 2012
Hi, I'm trying to understand how Wind Turbines work. Could a person take a small diameter large energy capacity turbine and mount it near the ground and place a 110V industrial fan that uses approx. 150 watts positioned in front of it and have it work? There are industrial fans of this type that produce over 10,000 CFM's (900 CFM being approx. 10 mph). Would this not work? Could you route some of your energy production back into running the fan for perpetual operation and use the rest to operate other household things and battery storage? Thank you for your response.

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