I drilled 3, 1 inch holes in the top sidewall of each tire about 3 inches below the treads. I created a tire pyramid last fall using the biggest tires I had. It stands about 7 feet tall using 4 tires as the base, 3 tires in the middle, and 1 on top. Drilled holes in all of them and the entire structure is now underwater.
That is exactly how I built mine also about 20 years ago. 4/3/2 stacked and tied together in a pyramid, except I didn't drill holes in the top two tires but did in the rest so the air in the top two would keep the structure upright as it sunk from the melted ice I built mine on. I also had rocks in the bottom 4 tires to help keep it upright as it sunk.
Wind turbines were were built in our area last year and I can see maybe 30 from my property. I like them and could have had a couple on my property but I am in a glide area to the small airport in the area. It looks like the future is coming fast.
I was going to build a wind turbine for the pond and bought plans from a guy in Scotland. It was two bladed, 12 volts and the generator is made from a truck brake drum and rear earth magnets. Just a dream setting in my computer room drawer.
