For some reason Asobo treats turboprop engines different than jet engines. At ~50% throttle all three turboprops are already close to overtemp when sitting static on the runway, which shouldn’t be the case. As reported already many month ago, Asobo apparently doesn’t consider the velocity of t…

The two points I’m trying to make are: 1.It is possible to remain static at 0kts with close to or at max thrust/power on a jet/turboprop IRL (SL & ISA) without exceeding ITT. This is only possible with jets in MSFS. MSFS turboprops are overtemping already at ~50% power, which doesn’t make any se…

The PT6A-66D is flat rated at SL up to 73C (!) according the EASA TC, so the TBM should not reach anywhere near peak ITT static on ground. And yes Ram Rise isn’t that significant at least on the turboprops I have flown, definitely not in the hundreds of degrees (have flown PT-6, TPE-331 and PW100). …

Another point is that idle doesn’t necessarily means the lowest temp on a jet engine. Can’t remember the PT6, but e.g. the CFM 56 runs noticeable hotter at idle than at low thrust settings, static on ground and in flight.

I haven’t flown PT-6 in 10 years so not sure. I will check on the ATR tonight, I’m pretty sure its the same. ITT is pretty high on ground when idling props feathered, then drops when unfeathering (which also spools up the engine on ATR to keep prop speed above min generator speed). The TPE was alway…

From the same TC: [Capture] Maybe the effect of air-bleed has been overdone? Have you tried with bleed-off?

Just checked my 350i manuals. No difference in the static TO powersettings, regardless of bleed or engine anti-ice settings. Btw, I’ve never noticed that the bleed air switches on the 350i are inop. edit: Bleed air switch works on the TBM, but has no effect on the engine parameters.

There isn’t even a take-off torque table in the TBM930 POH, at least I can’t find it. I guess the point at which ITT becomes limiting is outside the environmental envelope anyway. The take-off distance tables are all valid for 100% torque, bleeds - auto. Anyway, I guess we can all agree it must be …

Just out of curiosity does Asobo simulate the free turbine principle properly? What is the ratio between prop RPM and engine RPM in MSFS? Does the prop RPM drop off quicker than the engine RPM or does the ratio remain the same over the whole operating range?

That’s a difficult one to answer due to the sluggish and too slow throttle response :wink:

But the ratio while stabilized does change right? Engine RPM / prop RPM is a different ratio when feathered compared to unfeathered and full power? In other words the power section and compressor section are not physically connected?

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[BUG LOGGED] Turboprop ITT simulation still way off

Bug Reporting Hub Resolved