I'm looking to electrify my not-yet-built Northstar since I just sold off my .55ax on MCP. I've seen vid of a Northstar running a 4025 1100kV motor on 6S/5000 with a 100A Castle ESC. No mention of prop, however. Hard to tell from the video, but it looks to be doing 70-80mph easily... might well be a bit over 100.
I'd sure be interested if anyone has a particular 4025 1100kV motor to recommend, as I've already got just a few CC 100A ESCs and 6S/5000 packs lying around waiting for the 50cc profile to be completed...
Unless you modded the vertical and nacelle, I don't know about anything bigger than a 9" or 10" prop... 9square seems like a good place to start at the least... see "Watts Up" and adjust from there. I'd rather adjust and experiment with props than with motors!