Vintage Windmill and Wind Generator Forum

There was no helmet on that mill. It is considered an "Open-Gear" mill. All parts are open to the weather. Aermotor made a weather-proof enclosed, self oiling, mostly maintenance-free windmill in 1915. That would be the Model 502, which lasted 1 year I think. In 1916 they modified it to a Model 602 which went until 1933.

Not sure what a 'Lookout" is you are saying.
Sorry, I am confused with your last post. But then again, I am easily confused anyway.

sorry lookout : platform you understand

I also have several numbers on the parts of the wind turbine
B0152'4
B0152'2
B152
B110
B108
B106
B109
B112
B92

Your tail pivet has a B on it which means 10ft mill which is the size of the wheel

Okay I missed your last post with all the part numbers according to my literature it is a 10ft heavy aermoter 1907 RA model

can you tell me from which year this model is manufactured and until when
may we also know how many were manufactured

ah ok I thought that 10 ft was the total height of the wind turbine but in fact it is only the diameter of the wheel

All I can find in my litterateur they made the heavy model in 10 and 14ft in 1907 after that I don't know

ok thank you so much if I recapitulate , this is a model 502 from 1907

Your windmill is a 1907 RA.

Model: RA (Removeable Arms)
First year produced: 1907