ATB,
I'm running a [link=http://www.unitedhobbies.com/UNITEDHOBBIES/store/comersus_viewItem.asp?idProduct=3849]KB20-40-17L 3400kv[/link] BL motor from United Hobbies. I'm working on a detailed BL conversion article based on my experience with the Axe, but it's gonna take a little while. Anyway with this motor the thing is a animal. It's fairly warm at the end of a run (160-170*F), but if it fails it's only $15.

I finally got fed-up trying to find info on this subject and ordered a tach to check RPM myself in addition to my meters for volts, amps, temp, and weight I should be able to nail this down. I basically used this set-up was a point of reference. At this point the head is really zipping along. I'm thinking of going to one of these two motors ([link=http://www.unitedhobbies.com/UNITEDHOBBIES/store/comersus_viewItem.asp?idProduct=4875]Feigao 130-L (2040)Size 20T 2900kv[/link] and [link=http://www.unitedhobbies.com/UNITEDHOBBIES/store/comersus_viewItem.asp?idproduct=4211]KB20-40L-20L 2900kv[/link]) to reduce headspeed, but I'll wait for the tach so I can take some readings to be sure. Being stuck with only the OE 14T pinion also adds to this challenge.

...for now to be continued...