I'm upgrading my GWS A-10 also. Is yours a GWS? If so go out to www.e-flightline.com, look for the ducted fan link. They have a few EDF-55 upgrades to choose from depending on your style of flying. Me I ordered the Himax 2015-5400. Please note that you will need two brushless ESC's, just cant get two brushless motors to work on one. Now how do you hook two ESC's up to the Receiver? I have a thread under hammer2002 out hear on RC universe under electric jets. One of the people that responsed is a guy named Carl RC univers name CTulanko he stated this "Another thing to note is that if you use the ESC to supply BEC power to the receiver, you will need to use a Y-Connector to connect both the ESC's to you receivers "throttle" channel. You can run into problems if both ESC's are supplying power to the receiver, so you just unplug the positive lead from it's plug on just "one" of the speed controllers. It's usually the middle wire and is either orange or red and you can put some heat shrink over it so it doesn't short against anything. This way, only one ESC is supplying power to your receiver."

I hope this helps, I'm wating for my new EDF-55's and my second ESC to come in, shoul be here by weeks end.