AT vs Berk

[Wet Dream]

I'm not trying to create a huge debate here, but rather a simple question. The Berk A impeller is equivelant to the AA American Turbine? Or is it the opposite?

[toad polumsky]

The old sand cast AT impellers were about the same as the berk impellers. The new investment cast AT impellers are far superior.

[miketsouth]

I use this chart.
http://www.americanturbine.com/information/impeller_chart_sd309.htm
How far could i be off? I have a recent AT pump with a B ss impeller.
Target 5100rpm @ 350 hp
Target 4800rpm @ 300 hp
Hopefully my SBC (stock, with a Comp xe274H ) will come within that range.
no stickers here.
mikeT

[LVjetboy]

"I'm not trying to create a huge debate here, but rather a simple question"
Sometimes "simple" questions not so simple after all. And why no debate? In history, people debated planets revolving around the earth or around the sun. That was a "huge" debate. People lost lives over that one. In perspective, jet boat forum debates no big deal.
According to charts, a Berk A is equivalent to an AT A based on hp vs rpm (not mfg quality or methods), your question I believe. Yet an AT AA is NOT the same as a Berk A or a Berk AA.
Impellers from different mfgs can in fact be different in rpm vs power absorbed for a given cut size.
jer