Not sure, but it may be as close as we can get to 2500 Kv. I'll see if Bob has measured it.

Yes!

So would these lower kv motors do fine on higher voltages? Judging by the rpm limits, I would think the 8.5 would do ok on 6s.
Would the build a balistic include the option of the 14mm rotor, without buying the 12.3?

I will have to check on the higher voltage uses.

The B-A-B would offer a selection of the wound stators, rotors and harness length. Later, we may add ceramic bearings as an option.

The link you quote has the following info in the web page on your site:

SPEED CONTROL COMPATIBILITY
All of the Ballistic 550 motors are compatible with Novak’s Kinetic Racing Brushless ESC (#1740), Havoc Pro Brushless ESC (#1735), GTB Programmable Racing Brushless/Brush ESC (#1710 / #1711), Havoc 3S Brushless/Brush ESC (#1733) and any other sensored brushless speed control.

I've been running a HV7.5 on 3S with the Havoc 3S in a CRT.5 for a while. The speed control doesn't even get warm. Is the blurb above to say that the Havoc 3S can successfully be used with the 4.5 turn Ballistic 550 (and by association, the original HV4.5)?

And then the follow-on question would be: if the HV 4.5 can be used with an ESC rated for 8.5 turn 540 motors such as the Havoc 3S, can it also be used with the Havoc 2S (on 2S) and the XBR (on 2S)?

THIS is a MUST. You've got to get this done.