You are not applying 500w you are using 500w to turn the motor which in return is creating the rotational speed of 1750 rpm.
So i am applying 500w of rotational speed that is then converted to the equivelent of 47 mph wind with a pulley
I want to ask and i already said that an extractor of air that consumes 150 watts has 1750rpm. How is that different from consuming 500 watts instead of 150 watts? As I see what we need is 1750 rpm right to give air blowing speed of 47mph?
also to convert rpm to mph,
https://sciencing.com/convert-rpm-mph-calculator-2854.htmlFor example, if the rotational speed is 100 rpm, enter "100." Multiply this number by 60 to convert it from feet per minute to feet per hour. Divide this number by 5,280, which converts feet per hour to miles per hour. Push the equal sign to see the speed in mph.
Using that webpage to calculate it, it gave me the number of 20 mph, 1750 x 60 =105.000, divide by 5280 = 19.88 mph.
Maybe your 500 watts 1750rpm is not 1750rpm, more like 4200rpm. That explains why it uses 500 watts. 3 x 150w = 450 watts.
The noise a 4200rpm generates kill everything in few meters.
Also what i think is the most important is the cfm and the cfm is related to diameter and rpm.
Generating electricity from wasting electricity, i wonder is that is really viable or just a waste of time.
The wind turbine works better with? 30cm, 40cm, 50cm, 60cm, 70cm exhaustor? and I guess it has to be very close or with a good connection with pipes, cause it can not have any leaks.