Well here's my $.02 worth.. The USN conducted tests between the 190A ,the F6F-3, and F4U1-C .Now those two USN fighters didn't have WEP that would come in the F6F-5 & F4U1-D models while being retrofitted to earlier models. I'm also thinking that both those later models had other improvements as compared to earlier models most notably in improving the already good roll rates even more. So talking about tests which stated that F4U's should try to manuver instead of diving & such against a FW-190 may depend on what model your talking about. If we're comparing the F4U to the P-51 well according to Dean's "America's 100,000" which compares basically fighters using 100 grade fuel and not getting into the overboost & such we have as follows. The F4U-1D would be faster by a significant margin up to 20,000' but then the P-51 would take over. In climb both in initial & sustained climb the P-51 is superior but not by all that much. The P-51 seemed to accelerate better. In initial dive accelration the F4U-1D and P-51D are equal though the P-51 had a better higher mach number with one aircraft enduring dive speeds of 605 MPH in several tests with the F4U-1D enduring 575 MPH dives however it also seems the an F4U-1D that suffered dive damage during combat was much,much more likely to retain structural intergrity till it got back to base it seems. In rolling once again the P-51 semed to enjoy the advantage while in turning the P-51 also seemed to enjoy a advantage though to be fair to the Corsair Dean's book states that other evidence indicates that the Corsair may have been the equal in rolling to the Mustang . edit...It seems at lower speeds the F4U-1D did better in turning. As far as ruggedness there seems to be no comparison the Corsair is head & shoulders ,if not more, above the Mustang. It also is quite carrier capable unlike the Mustang who also would have much more trouble operating from some of the landing strips the Corsair used. However Dean's book also alludes to some of what T. A. Gardiner said about the cocokpit & such however in regards to carrier operations it seems the F4U-1D's performance envelope would be better for carier operations,i.e. lower altitudes. Francis Dean's book relied heavily in the ratings on pilot ratings during the Joint Figher Conference.