So he mentions that it was originally a D model upgraded to an H but and he lists some boiler plate H information but we don't know if that H model has the -13 or -703 engine which I think is 400 more horsepower. Yes I saw the list that says -13 but I'm not convinced they didn't just google H model and list the base engine they had versus asking which one. The DCS H has the -13. Also a military helicopter is alot heavier than a civilian one. When they go to civilian service they get stripped of alot of unnecessary equipment like IFF, the second generator, armored seats, etc. So you would need to compare the actual weights of the helicopters. And I've never bothered but people have compared the DCS huey to performance charts and its come up fairly close until you get to high altitudes. Thats not to say it couldn't use some improvement. I'd like to see VRS reduced and more pedal authority added.