It's going to be interesting to see what I get with my 4 after I change to the 912ULS. With the 912ul I would get 103kts open throttle. I have the .090 windscreen and it will start to push in at about 120mph. What kind of windscreen do you have? I don't have wheel pants, because I have the big 21inch wheels, the grove gear and speedster horizontal and elevator. I have the pvc struts for the wings. If the speeds go up that much, I'm going to have fun fun fun with my NEW 4.