CrashTronic

It's true for all phases, after takeoff, the power is always lower than where it should be. Enjoy and let me know if you run into any other issues. Hopefully an update occurs.

Yup you are cruising using only ~950hp per engine, about 250hp short of where you should be or 1000hp total. With the change from XP10 to 11 something changed the piston engine behavior and the AFE always undershoots the power in XP11, meaning you have to control it now and use the cruise tables in the back of the operating handbook. If you set book power values, the speeds will match. Hope this helps, Mike

Thanks for the photos, my initial hypothesis is your engine power is low based on your BMEP, but I need a bit more information. Could you take some more screenshots with the overlay displaying engine rpm and engine power instead of torque and prop rpm? Thanks, Mike

The performance seems to match high blower settings up to about FL190 in the low blower setting, I am using the 11.10 beta. My testing indicates the airspeeds are pretty close to right. @alexcolka please let me know if you find any discrepancies. If you do find one, please retest at "clear" weather settings (ISA) if you aren't there already and please send the aircraft altitude weight, airspeed, engine: RPM, BMEP, Fuel Flow, power, blower setting, and mixture setting. The altitude, engine power, fuel flow can be found in the data output screen of the settings and click show in cockpit.Thanks!

It's a quick and dirty work around until/if PMDG decides to update the core functionality of the code. I'd be happy to help update the blower code and CHT profile and support it myself. I really do not want to see this airplane fall behind the xplane update cycle. As reference I did the twin otter from aerosoft updated and alternate FDE a couple of years ago with support from Aerosoft: http://forum.aerosoft.com/index.php?/topic/88611-updated-fde-to-twin-otter-updated-2842015/ http://forum.aerosoft.com/index.php?/topic/94799-fsx-p3d-v1-dhc-6-300-wheels-alternative-fde-and-engine-simulation/

New Changes to the high alt values. Tested at 19000 low blower auto lean for cruise

What values did you change for the FF and how close are they? could you put a reply in my topic about superchargers so we can compare notes? thanks!

@SO666 provided you only release the sections of your cfg you modified you aren't infringing on the PMDG IP. I have been mucking with the xplane aircraft settings have made mods for the Aerosoft twin-otter as well. do not release the entire file, rather quote the sections and data you changed if you want an example see my thread for xplane as an example

can you please attach screenshots showing this issue? Thanks!

@DEHowie It would be nice to know. For now you can check out my thread which updates the SFC for the engines, it's a wip, the high blower doesn't work quite right either but it's better than a direct import

X-Plane 11.10 beta With the addition of the new aerodynamics and minor changes to the piston code I have reformulated the SFC for the DC-6. Things of note: The specific fuel consumption values match in sim to POH values at 1200 bhp and 2400 bhp The actual x-plane sfc model appears to follow a (c+x^n)/x rational function where X is power and Y is SFC, however at the power levels concerned a linear approximation is quite adequate for the 1/2 power to full power range with SFC deviating from expected values at lower power values. The fuel flows per engine do not match poh values and deviate from poh as follows (low blower only, auto-rich) 1800BHP (METO) -140pph 1500BHP (Climb) -150pph 1400BHP (Climb) -150pph 1200BHP (Cruise) +65pph 1100BHP (Cruise) +87pph ACF SFC set values P acf/_SFC_half_lo_PRP 0.3982 P acf/_SFC_half_hi_PRP 0.3982 P acf/_SFC_full_lo_PRP 0.70225 P acf/_SFC_full_hi_PRP 0.70225 X-Plane SFC observed / POH 1200BHP (Half) - 0.487 (597pph) / 0.487 2400BHP (Full) - 0.861 (2067pph) / 0.857 I have not tuned the high altitude (hi) SFC values or the Auto-lean.

Oh and I should add, below ~17" mp the prop drives the engine according to AFSD.

Solution to the negative torque problem....hang jets on them wings

If shock cooling is a risk then are those effects also seen in cold climates sub zero temperatures on shutdown? It appears that would be the greatest shock cooling area because of no heat production. And with a massive fleet of piston powered airlines we have yet to see any evidence which is statistically relevant to support shock cooling. Yes damage can happen if there are flaws in the metallurgy but that is the root cause not the high cooling rate theory. I highly suggest reading Pelican's Perch by Jonn Deakin https://www.avweb.com/news/pelican/182102-1.html He has a wealth of information and we used it at our flight school as a foundation to engine management, especially for those looking to get into the big bore high performance engines.

probably 12000-16000

Just a quick update for the SFC The Full power High and low SFC should be 0.962. The low numbers stay the same. This should give much better fuel flows. Thanks

Good to know. I am currently fully immersed with xplane 11. I find it a much better platform and have made the switch. In my supercharger inquiries I managed to address the fuel flow issue with the aircraft and a sign switch - to + in one file makes the model work perfectly. Thanks though!

Or you can open the DC-6 ACF file and remove/replace the following specific fuel consumption P acf/_SFC_alt_hi_PRP 10000.0 P acf/_SFC_alt_lo_JET 0.0 P acf/_SFC_alt_lo_PRP 0.0 P acf/_SFC_full_hi_JET 0.0 P acf/_SFC_full_hi_PRP 0.842 P acf/_SFC_full_lo_JET 0.0 P acf/_SFC_full_lo_PRP 0.763 P acf/_SFC_half_hi_JET 0.0 P acf/_SFC_half_hi_PRP 0.453 P acf/_SFC_half_lo_JET 0.0 P acf/_SFC_half_lo_PRP 0.453 This change doesn't address the high blower setting issues when switching from low to high.

Dont know if this still works but i found it using google

I have resolved the fuel flow issues in XPLANE 11 Open up the plane maker, go to the engines screen, go to the SFC tab. Set the following values Altitude: 10,000ft High Alt Full Power: 0.841666667 Low Alt Full Power: 0.762500000 High Alt Half Power: 0.452500000 Low Alt Half power: 0.452500000 Follow this guide if you need: http://developer.x-plane.com/manuals/planemaker/index.html#creatingtheengines @Pilot53 @deimos256

I have attempted, and failed. I just assigned the global "Throttle" in FSUIPC. I have a saitek X-65F but I can't figure out how to either

As expected it's more complicated than it appears. mixtures are auto adjusting as the name implies. Further testing in progress. Edit: nope im just a doofus. It works fine.

Wish I could use it! Linda is broken for me because I use a trackball mouse and the devs have given up on being able to fix that bug per their post.

@deimos256 Thanks, I adjusted my values as well for SFC. I also noticed the mixture control doesn't work in XP11 either, I'm currently investigating why that might be. Current numbers: High Max: 0.684 half: 0.633 Low Max: 0.715 half: 0.553 I tried turning off the FADEC settings in plane maker and in the sim but the programming in the DC-6 still sets the mixture full rich regardless of where the handle is set. Interesting sidenote: the prop is super sonic at the tips at all times, not due to anything PMDG did but because of the diameter of the prop spinning at higher than 1651 rpm. I tried last night to fly the plane in FSX:SE and I see what many people say about airplanes feeling like they are on rails. I get a much more fluid sensation from X-Plane

Sorry to hear that! Screen shots would be very helpful in diagnosing what issue you are having. Thanks!