Engine Failures

[nisx]

Greetings,

I'm flying per the manual but I'm getting an engine failure almost immediately after takeoff. Not sure what else to do, any thoughts?

[jarek]

It's almost a live animal. The list of numbers to respect is long, here is a basic list of parameters to respect in order to keep the engine healthy. Things like adding fuel too early (below 12% N1) or disengaging starter early, over-torque at takeoff/ga etc... will cause a harm.

Maximum N1 Limits
1. Minimum Idle – 62%
2. Takeoff – 104%
3. Maximum continuous – 104%
4. Transient – 104%

ITT Limits
1. Idle – 750°
2. Maximum reverse – 760°
3. Cruise climb – 785°
4. Takeoff – 820°
5. Maximum continuous – 820°
6. Maximum cruise – 820°
7. Transient – 850° max for 20 seconds
8. Start – 1000° max for 5 seconds

Maximum Prop RPM Limits
1. Idle – Minimum 1050
2. Cruise – 1500
3. Maximum reverse – 1650
4. Takeoff – 1700
5. Maximum continuous – 1700

Maximum Torque Limits
1. Takeoff and Maximum continuous – 100%
2. Inadvertent – 102% for 7 minutes
3. Transient 156% for 20 seconds

[KenG]

There is failure modeling on the engines. Most likely on Take-off, you are over-torquing the engines.

I recommend initially setting about 90% torque (or maximum ITT of 820 degree for a high altitude and hot airport) for take-off roll and as the airplane accelerates through 65 KIAS check that no more than 100% Torque and 820 degrees ITT are selected. Follow the below profile.

KA TO Profile.png (182.44 KiB) Viewed 621 times

When you reach 160 KIAS on take-off pull the power back recommend 96% torque or 785 degrees ITT whichever is higher. If you set 95% torque you will need to add power during the climb until you reach 785. (785 is used to reduce engine wear and tear and give you a margin below 820.)