Sorry, I didn't see the question above until just now. I don't recall specific speeds, but I generally turn something like this as fast as I comfortably can since it reduces the problem with the intermittant cut on the wings. I'd guess around 1250 to 1500 RPMs for something like this... Basically, I'll spin it as fast as it will go without vibrating.
I guess it doesn't matter since you've already turned one.