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Like his rationale, ..if you don't want to watch thevarious 3d printing, guttering & screws assembly videos, this is the one to watch, indeed, mass producing the expensive compons & streamlining overall cost ups the perceived acceptability to many of "not as efficient as a commercial unit"

Sample test of rotor spin conducted by a petrol station at waist height, insightful, ..no marketing spin!

& this is what i'd like to see on iron rods attached to my six foot concrete fence posts gaining some sort of trickle feed energy potential from winds blowing over the fields hereabouts.

I don't get it. Commercial units are barley feasible. Ask Panasonic how those 15MW units are going.

There are real world constraints. Imagine designing something so good at harvesting wind energy that the wind stops, you can't.

RMS doesn’t get many watts out of any of his projects but I watch them all because I generally learn something.
The rather attractive blue rotor above is a helical Ugrinsky version, helical to have better start up performance and presumably less stopping time. He 3D printed it in 4 identical sections because of the length.
He also made 2 versions of a non-helical Ugrinsky, the simpler of which I will probably copy as a wind ornament.

Stan wrote: ↑Tue Jan 10, 2023 9:10 pm RMS doesn’t get many watts out of any of his projects

Has he ever shown anything of practical use?

Whats the output of this in batches of 3 estimated to be dribbling out? ..the premise of cheap + low output is a tempting proposition to us with a small garden but open space.

He doesn’t need to generate watts, he’s generating income via the uploads

Mr Gus wrote: ↑Wed Jan 11, 2023 2:19 am Whats the output of this in batches of 3 estimated to be dribbling out? ..the premise of cheap + low output is a tempting proposition to us with a small garden but open space.

four fifths of F.A. is the quick answer. However, as I have stated several times before it is easy to work out the theoretic maximum any device could produce in ideal conditions:

Power = 0.5 x 1.23 x A x v³

A = swept area in this case approx 0.15 x 0.5 = 0.075m²
v = windspeed, assume 10m/s ( 22mph) (very generous for a back garden at 2m height) !

this gives around 46 Watts - BUT you have Mr Betz to factor in as you will not extract 100% of the wind energy, theoretical max is about 59%, so the absolute max power you will get from each one is 46 x .59 = 27 Watts in a steady 22 mph wind - which won't happen often, so bank on 5 to 10 watts if you are lucky, add in regulator and cable losses and they become expensive garden ornaments. It will be very intermittent, even if you think you have a "nice steady" wind across the garden. I

AGT wrote: ↑Wed Jan 11, 2023 10:42 am He doesn’t need to generate watts, he’s generating income via the uploads

Yes my thought too

Thanks, 10 - 15 watts plus solar top up is one small thru large (boxer) heated dog mat / cat mat in a kennel type environment, which would be helpful specced to be appropriate for small item needs.

Then it comes down to per unit cost & serviceable lifespan.

I know of several animal rescue places located in windier environs (cheap land)

Stables, field shelters, poultry sheds, wildlife hides, firewatch towers & the like where even a trickle of energy may be useful / supplemental.
(firewatch towers are typically 100 ft tall with a tiny cuppola cabin, fire season can be april to september, baking metal sheeting in summer, I could see some low wattage kit being useful after being carried / roped & hoisted.

Example

https://www.cbc.ca/news/canada/edmonton ... -1.5164036