The Baron’s best rate of climb is achieved at 105 knots indicated airspeed, but often Baron pilots will climb at a faster speed than that. This is known as a “cruise climb” and the main benefits are better engine cooling and faster ground speed during climb out.
You should be at full power when taking off, but once you hit about 400 feet above the ground, you’ll want to pull the propeller (blue) levers back so that the RPMs read 2500. The throttle can stay wide open for the climb. You should adjust your pitch for somewhere around 136 knots for the rest of your climb. Pull up to slow down, push down to speed up.
In the real Baron, that will get you approximately 1,500 ft/min ± 500 ft/min depending on how heavy you are and the density altitude. I’ve noticed that in the simulator the Baron’s climb performance is a bit in excess of what the book says it should be, so it may be more than that.
Also, don’t forget to lean the mixture as you climb for max power. In the real thing, there’s a handy little arrow on the G1000’s fuel flow gauge that tells you exactly how to set your mixture for the climb, but in the sim, you just have to eyeball it. Pull the mixture (red) levers back slowly until you see the fuel flow stop increasing. If it starts decreasing, you’ve gone too far. Keep checking that every 1,000 feet or so of climb.
Hope this helps.