Jump to content

Issue with engines?


Recommended Posts

G'day all,


So I've been messing about with a B-57 Canberra I have, and 'fitted' it with Rolls Royce Spey 511 engines. Got an appropriate sound pack, edited a few parameters in the aircraft.cfg, and I appear to have come across an odd issue.


Basically, at higher altitudes (FL300 and higher), the engine seems to lose thrust if it runs at full throttle. I'm cruising at lets say FL360, and set the autopilot (I've fitted it with the stock 737-400's autopilot) to increase speed from lets say Mach 0.76 to 0.82. It increases engine power, as expected, and the aircraft will accelerate, but after about 10 seconds, the engines seem to rapidly lose power (no difference in N1/N2 speeds) and the aircraft starts to decelerate. If I disable the autothrottle and manually throttle back to about 90% power, the engines pick up and the aircraft accelerates again.



Is this just physics at work, or have I messed something up somewhere?



Link to comment
Share on other sites

"edited a few parameters in the aircraft.cfg"


I would edit the same parameters in the .air file as well, not all of the .air file parameters are over-ruled by the .cfg ones. Check that the EGT parameters are within limits for the "new" engines as they could be overheating at full throttle. Max take off EGT should be 585C, max continuous 540C for the Spey 511.

Tim Wright "The older I get, the better I was..."

Xbox Series X, Asus Prime H510M-K, Intel Core i5-11400F 4.40GHz, 16Gb DDR4 3200, 2TB WD Black NVME SSD, 1TB Samsung SATA SSD

NVidia RTX3060 Ti 8Gb, Logitech Flight Yoke System, CH Pro Pedals, Acer K272HL 27", Windows 11 Home x64

Link to comment
Share on other sites

Did you turn ON the Pitot Heat (Ctrl+H)?

Chuck B


i7 2600K @ 3.4 Ghz (Turbo-Boost to 3.877 Ghz), Asus P8H67 Pro, Super Talent 8 Gb DDR3/1333 Dual Channel, XFX Radeon R7-360B 2Gb DDR5, Corsair 650 W PSU, Dell 23 in (2048x1152), Windows7 Pro 64 bit, MS Sidewinder Precision 2 Joy, Logitech K-360 wireless KB & Mouse, Targus PAUK10U USB Keypad for Throttle (F1 to F4)/Spoiler/Tailhook/Wing Fold/Pitch Trim/Parking Brake/Snap to 2D Panel/View Change. Installed on 250 Gb (D:). FS9 and FSX Acceleration (locked at 30 FPS).
Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...