I've been reading in various sources recently about the PRC Tu-4s modded with the turboprops. We all, I guess, know about the drone carrier & AWACS & I've read some indication that the conversion goes back to the '70s for the standard bomber version, I guess the drone carrier being closest to that. However, I've not found any performance data & I'm curious as to that. I don't know how the weights of the piston engines compare to these turboprops, but they are about twice the power of the recips & appear a cleaner (less drag) installation combined with the additional exhaust thrust, surely the a/c would have been a screamer, not to mention climbing like a bat out of Hades along with greatly reduced ground roll & probably no payload weight limit. Anyone ever seen or heard what its performance was? Or, any of you engineering types have a thought? My limited knowledge & guesstimate of turboprop mods in general it oughta be able to hit about 500 MPH, but I also don't know the airframe limitations, in addition to climbing like that aforementioned bat & other guesstimates. Thanks.