From what I understand most outrunners have a relatively low rpm limit because of the amount of mass they are turning. Also, I think most outrunners are much higher pole counts. Like 10, 12 or more poles. This may also have something to do with the extra tourque.
Its actually funny that you say this. I
just ordered (ordered on Monday)an ourunner I am planning on testing in a BL Cen Matrix project I am starting.
There is actually a company that makes outrunners specifically designed for car and truck applications.
www.cyclonbrushless.com
I have been wondering about these motors for quite a while but I havent found ANYONE that has tryed them yet. So, I decided that this would be a good place to test it. They are a little diferent than your typical outrunner. They are supposed to be good up to 40K rpm. I'll let you know what happens. Although its probably going to be while since I am lieterally just starting and this is going to be my ''winter'' project. I am going to use the Cyclon Car 2000 (2093kv) motor on 5s (if your gonna test it why not push it right to the limit :018: ) with the Quark 125 set to ''outrunner'' mode. Its the only car controller I have ever seen with a setting for outrunner mode.
My thought was I could go with a lighter motor and get just as much/more torque out of it cuz its an outrunner. We'll see I guess...