00:01
We'd like to calculate the diameter of the blades.
00:09
Let's do it for our turbine blade diameter.
00:14
Our mechanical power is just our output power over our efficiency, or 100 kilowatts divided by 0 .85.
00:23
We get 117 .6 kilowatts.
00:27
Now the area swept out over the blades is 2 times our mechanical power over density v squared.
00:36
We get 126 .1 square meters.
00:40
Then the diameter, d, is our square root of 4 times this area divided by pi.
00:48
We get 12 .68 meters.
00:51
For the direct drive option, we could follow the similar process.
00:57
Now we'd like to find our angular velocity of our turbine, which is just our speed divided by radius...