Wind power is measured by swept area. There is almost no swept area with the one design that looks like a water wheel especially when one side will have to push against the wind. And as Hedges alluded to it is basically meaningless to measure a wind turbine under no load. With no load a lot of "small" wind turbines will have huge voltage spikes and spin so fast they could eventually fly apart, hence the reason why many require a load of some sort at all times to prevent that.
I have showed the amperage 19 amps, using 8 dc motors, that is the reason of why it is so high, but the video was old and did not use 2 multi meters, but even as that, the speed of the spin indicates that there is a voltage, maybe not 20 volts but let say 10 volts being humble, it is amazing for a portable wind turbine even. (When you place a multi meter to measure amps it is more hard to spin, if you say it is free load, sorry but very limited information you have about that applied to wind turbines when you measure in amps a turbine spin)
Rhino, do not simplify your arguments to misleading statements as (With no load a lot of "small" wind turbines will have huge voltage spikes and spin so fast they could eventually fly apart, hence the reason why many require a load of some sort at all times to prevent that.) it was measured in voltage and in amps, so do not pick just voltage to decorate your 2 sentences. When you measure amperage there is a load!!!! If you have ever measured a turbine spin with your hands just change from voltage to amperage and you will notice that it is more hard to spin. Another thing you have not taken in consideration, it used a gearbox of 10x1 so that have more resistance, usually those portable small wind turbines do not even have gearbox so it fly away as you said. An empty paragraph for the gallery does not give more credibility to your commentary
Can I measure amps with a multimeter?
A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms). So if you are saying that when the multi meter was measuring voltage ignoring that it measured also amperage then sorry but you have a lack of information or you did not thought about it and you preferred to concentrate in voltage so your reply was having more sense. The term amp load is used to indicate the power you get from the main electricity source or transformer.
Amperage is the official term used for the measurement of the total electrical capacity.
Here is again a 3d picture showing the extension unit. You can extend them up to 1.20 meters, and it will do not bend if it is done with poly carbonate filaments. You can unit extension with extension and even link the turbine with each other with let say copper coil cables so it do not bend if you want to extend it much further than 1.20.
Rhino, there is another version of a multi-stage system that you can use more blades so more swept are, anyway this system can use up to 18 dc motors, and it has been in the project of the students of applied sciences of Munich university (Engineering students).