Crash, the WM 400 fan works fine. The plane seems to have a bit more power. I have tested the thrust using my test stand. I was getting 2 lbs, 4 ounces of thrust at 39 amps. The motor I used was a Mega 2. I do have other thoughts on that subject. I have a modified fan that is getting almost 3 lbs of thrust at 65 mps, 670 watts. Keep in mind that this set up is using two Zippy 3s 1450 30-40c batteries hooked up in parallel. If you can get your hand on the parts, it should work better. I used a RCLander 68 mm fan housing, a HET 2w motor, and a HET four bladed rotor. It is a bit heavy, but much lighter than the stock RCLander setup. The sotck fan weighs eight ounces, and the modified fan weighs 5 ounces. I am using this same fan on a RCLander F9F with a flying weight of 42 ounces. Trust me there is more than enough power. Flight times are around 3 1/2 minutes. I could probably get more flight time, but there would be a sustantial weight penalty. Mounting the WM 400 fan is easier, and one would have to get creative to mount the RCLander fan.