I'm asking because as I know part 25 climb segment performance requirements are for feathered propeller, so it doesn't cover the case which you can't feather the prop.
I'm just flying a DA-42 at the moment because I'm in training and there is a 200-300 fpm loss with the prop unfeathered, but I guess the figures are very different for big turboprops due to bigger props and otherss and also different certification.