Not sure when it was developed, but the Thunderbeam was available thru the late 1980's or early 1990's. Ermanno Dilorenzo once described the T-beam to me as "A giant wastebasket", Which is pretty accurate. It had 12 ports like an STH10, so it seems like under ideal conditions the pitch would've been closer to 675 hz. If I remember correctly, the RSH10 used the same rotor as the STH10, but with a different stator, similar in concept to that of the 2001. I believe it used a gear reducer to drive the deflector plate (I have an old parts diagram somewhere). If this was a single phase unit, many of them had brushes that were prone to wearing out.Fletch wrote:Definitely one of the most interesting looking sirens ever designed.
Does anyone know the production dates for this siren?
There are a few scattered around Ohio. Mostly to the east of Columbus.
This test reminded me of a famous quote from "Alice", of "The Brady Bunch"...."It sounded like a cow died in the driveway".