Gratuitous C.S. Forester Blegging

I'm currently in the middle of C.S. Forester's The African Queen, the 1935 novel on which the famous 1951 movie starring Bogart and Hepburn is based.

I've got to the bit where the Queen's propeller and shaft get damaged and need to be repaired (which event occurs while the boat is still in the rapids, not after our heroes have made it to the lowlands as in the movie). So far, at least, the primary difference between the book and movie is the book's much heavier focus on the transformation of Rose Sayer from repressed spinster to full-blooded woman during her journey with Charlie Allnutt down the Ulanga, some of it getting positively racy.

This has gotten me wondering: Did Forester himself have anything to do with the movie's screenplay? And apart from that, what did he think of the film? He didn't die until 1966, so presumably would have had ample time to see it.

UPDATE: Finished the book. The movie stays pretty faithful to it right up until the point where the African Queen sinks in the storm. Without giving away any spoilers, I'll just say that the Hollywood Ending is considerably different from Forester's original. Dunno what he'd make of it, but if I were in his shoes, I'd have been pretty crabby.