Wind Speed, Power Chart

Power in the wind
local wind speed	power in the wind		Our System 200,000 square feet of wind area		Tower Windmill 200 foot diameter 31,400 square feet of wind area
			Cost ~$1.8 million		Cost ~$15 million
	watts/ square foot	watts/ (our) total area	KW electricity out	Maximum mech'l speed	KW electricity out	Maximum mech'l speed
0 mph	0.00	0 kW	0 kW	0 mph	0 kW	Not used
2 mph	0.04	8 kW	2 kW	8 mph	0 kW	Not used
4 mph	0.32	65 kW	20 kW	16 mph	0 kW	Not used
6 mph	1.08	200 kW	60 kW	24 mph	0 kW	Not used
8 mph	2.56	500 kW	150 kW	32 mph	30 kW	48 mph
10 mph	5.0	1000 kW	290 kW	40 mph	60 kW	60 mph
12 mph	8.6	1700 kW	500 kW	48 mph	110 kW	72 mph
14 mph	13.7	2700 kW	800 kW	56 mph	170 kW	84 mph
16 mph	20.5	4100 kW	1200 kW	64 mph	250 kW	96 mph
18 mph	29.2	5900 kW	1700 kW	72 mph	360 kW	108 mph
20 mph	40	8000 kW	2300 kW	80 mph	490 kW	120 mph
22 mph	53.2	10600 kW	3100 kW	88 mph	650 kW	132 mph
24 mph	69.1	13900 kW	4000 kW	96 mph	850 kW	144 mph
26 mph	87.9	17500 kW	5100 kW	104 mph	1080 kW	156 mph
28 mph	110	22000 kW	6400 kW	112 mph	1350 kW	168 mph
30 mph	135	27000 kW	7900 kW	120 mph	1660 kW	180 mph
32 mph	164	32800 kW	9600 kW	128 mph	1970 kW	192 mph
34 mph	197	39400 kW	11500 kW	136 mph	Dangerous
36 mph	233	46600 kW	13700 kW	144 mph	Dangerous
38 mph	274	55000 kW	16100 kW	152 mph	Dangerous
40 mph	320	64000 kW	18700 kW	160 mph	Dangerous
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			Even at extreme windspeeds, no mechanical danger exists, so maximum limit is unknown		System rated at 1800 kW ABSOLUTE maximum

These windspeeds are at the height, which is commonly twice what the ground windspeeds are. If ground windspeed in a storm got to 40 mph, the wind speed at the top of a tower windmill could be in excess of 120 mph. Because of the design concept of the high-tip-speed tower windmills, the outermost tips travel at around 6 times the local windspeed, in other words, around 720 mph! That is in excess of the speed of sound, and the enormous rotor would likely disintegrate due to any of a variety of mechanical problems, centrifugal force, vibration, sonic boom shock waves, etc. Therefore, tower windmills are rarely run when the wind is much over 30 mph. And they are too inefficient when the wind is less than 10 mph. So there is a Capacity Factor of between 21% and 34% of how regularly it can actually operate. In contrast, our system operates at much lower mechanical speeds, and as long as the rotor was built reasonably balanced, it should easily withstand any windspeed that could occur, and even be producing electricity at the time!