"I use before Auto climb but I find some strange behavior. Climb rate could suddenly change during climb."
If you hold a constant climb speed, climb rate will change as the engine power changes(look at the performance charts on the help page to see what I mean). It could also be due to wind layers, but I don't think wind is turned on in the MA?
"You needed a chart to figure that out? Simple to do. Get 2 of the same AC. One loads with externals, the other does not. The heavy plane is slower to altitiude.
Either that or look at your ROC when clean verus dirty. Easy to see the difference"
Uhm, what he noticed was that the best speed for climbing when you are carrying ordinance is lower than the default speed, which is the best climb speed for a clean aircraft. Ie: with bombs on, you actually gain some climbrate if you fly slower than the default climb speed, just like you would in Real Life™.
"Can someone explain to me why i should not use 100% throttle on the climb out?"
Uhm, you should use 100%(not WEP, save it for combat)! Unless you want to climb slower for some unknown reason...
The whole point is that if the best climb speed for a clean a/c is say; 160mph IAS, then with bombs on the best climb speed might be 150mph IAS, ie: lower.
Then again, there are some planes like the Yak-9U which has very close climbrates at any speed from 100mph to 200mph IAS.
