How do I know how to find the equivalent of this motor? http://www3.towerhobbies.com/cgi-bin...?&I=LXLWT6&P=M I am getting the new GP spad and this is the recommended. I thought I might save a few bucks if I order one from somewhere else in another brand. I am placing an order to hobby city soon so if anyone knows of a good motor like that or even more powerful, please make a suggestion. I will be using the electrifly 25A esc that is recommended. Thanks!

Look for a motor with similar dimensions and kv rating. It may not be exact but it will be close. You'll also want to compare Watt ratings. a lot of times ARF's from GP, E-Flite and others come set up to use their specific motor. That doesn't mean you can't use a different motor of course but it may require you to a do a little "engineering" on your own.

I found this, looks like it may be just a little more powerful which would be nice. http://www.hobbycity.com/hobbycity/s...idProduct=2112

Actually the Rimfire is slightly more powerful, as it's Constant Current is 14A while that is MAX current for the Turnigy.

The Rimfire is billed as a "400" sized motor, so you can look for something slightly larger.

As an example, in a plane that calls for a 450, I put in a 480 motor and got MUCH better results.

Remember that increasing the KV rating MAY NOT be a good thing.

Brushless motors and ESC's ALWAYS operate at maximum output values from the batteries.

The ESC merely controls the pulse width to bring down the rotational speeds.

That means that as you open the throttle, the motor will try to attain the KV rated rotation rate, or burn itself up trying.

All too often people will put in a high KV rated motor thinking that this will increase power, when all they are really doing is overloading the motor.

In an ideal situation the KV * Voltage total will be attained when the plane is at full throttle and partially unloaded, letting the prop spin. Some loading is desired, but not too much.

Wattmeters are your friend!