Questions for our Avsim pros with real-world PT6 experience based on the following:

In the sim most of the PT6 turboprops I fly have very linear torque curves from where they start to develop significant torque (from 60-80% Ng) with a linear development all the way to the Ng limit. This includes all the stock turboprops, the M500, the SWS PC-12 and Kodiak, and the Black Square 208 and King Air. I'm pretty sure the v1.1 TBM-850 was also this way.

The Black Square Turbine Duke and the v1.2 TBM-850 however have torque curves that are relatively flat, then essentially go exponential at the high end of Ng. I am sure there is some variation expected in a family of engine across many models but the latest TBM and the Turbine Duke to me really seem very different.

I plotted coarse torque curves for all these aircraft and most will develop the last 40% of torque in a range of between 10-18% of the high end of Ng. The Duke and latest TBM however develop their last 40% of torque in only 2-3% of max NG.

In the sim I seem to need to flog the TBM right at the Ng limits on most flights to get any speed out of it (after updating to v1.2). In watching a lot of Steveo YouTube videos he does not seem to need to do that and that made me curious about the real-world torque curves of the PT6.

Are real-world PT6 engines fairly consistent in the real-world like most of these planes? How does torque vary with Ng, especially near the Ng limits?

I'll preface by saying I've never flown a turboprop IRL so mine is not an expert or necessarily a knowledgeable understanding.

Interesting question. I've noted that on turbojet aircraft most of the thrust is in the last 25% - 30% of the N1/N2 range. For example there seems to be a smallish change in thrust between idle and 40% N1, but between 70% and 100% N1, the increase in thrust is dramatic, so I would assume the same applies to torque for turboprops.

I've got like 1500 hours in PT6 airplanes and to be honest, I've never really looked (and can't remember after a year and a bit out of them).  You push the torque up to takeoff power, and as long as the ITT and Ng aren't exceeding limits, you're good to go.  

I will say, the big PT6s, like the one in the Caravan EX, make a LOT of power between 1500 lb-ft of torque and the redline.  It's a very noticeable surge in power.