Here is what I am using on my Simple Stick which weighs about 20 ounces with the wheels and about 25 ounces with floats. It is very aerobatic, but not 3D. If you put it on your Yak, I think you could safely bet on being 3D with it.
Here is the motor - [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7705&Product_Name=TGY_Ae rodriveXp_SK_Series_28-26_1000Kv_/_240W]Turnigy SK 28-26-1000[/link]
The ESC - [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6457&Product_Name=Hobbyk ing_SS_Series_18-20A_ESC]Hobbyking Super Simple ESC[/link]
I think you might be able to use that Stick attachment with this motor too. I use a 9x6APC E prop on it and it is fantastic. It has a prop adapter that will mate right up to the motor. You don't use a gearbox, the benefit of the outrunner motors is the windings can be varied so much, that you can find one that will match your voltage and give you a good speed range. My 9x6 will turn in the 7000 RPM range.
Let me know if you have any further questions.
Curtis