Hi Everyone.
I have casually browsed through these pages and am impressed with the knowledge they offer.
I live in Johannesburg where the wind leaves a lot to be desired.
As a handyman and kinetic art hobbyist, I stumbled across an idea for a new propeller design that takes full advantage of wind direction change and gusts at a low elevation of 2m.
My prototype is up and seems to run continuously during the day at 2m in suburbia reaching 4 revolutions per second from time to time. But averaging around 1 – 1.5
I invested in a bicycle speedometer and a weather station for a more accurate data and constructed a 9m high tower on which to mount this contraption - which I have not yet done, preferring to conduct low elevation tests first.
The first results are meaningless to me. Perhaps someone can help to decide whether this project is viable or not.
Prototype 1:
Measurements: Metric (mm)
Propeller Radius: 650
Propeller Diameter: 1300
Propeller Circumference: 4084
Propeller Surface Area: 424110
Attack angle: 22*
Sweep Area: 1327322
Propeller to Sweep area: 31%
Propeller Weight: 5.1 Kg
Measurements: Imperial (In)
Propeller Radius: 25.5
Propeller Diameter: 51
Propeller Circumference: 160
Propeller Surface Area: 657
Attack Angle: 22*
Sweep Area: 2043
Propeller to Sweep area: 32%
Propeller Weight: 112 lb
Average Weather:
Altitude: 1690m
Barometric Pressure: 82.54 kg/m3
Air Density: 0.98 kg/m3 at 20*c
Relative Humidity: 22% - 96%
Wind Speed: 1m/s - 7m/s
Temperature: 3*c – 25*c
Test 1:
A short lived wind of 7.2 km/h produced a speed of 40km/h at 2m elevation
Test 2: 6.1 - 42.6
Test 3: 3.6 - 33.6
Test 4: 5 - 30.8
Test 5: 3.6 - 26.4
Test 6:
Test 7:
Test 8:
Do these values hold much water and if so how much.
Please help if you can.
Regards.
OooWeh.