Sitting on the tarmac and having the condition lever in FLIGHT position with the power levers all the way forward, the EGT goes over the limit by about 30 degrees. I was expecting an engine "melt down" but to my surprise nothing happens. After a little bit, the EGT falls back to its limit without me touching anything. Is this normal?Thanks and best regards,

Sitting on the tarmac and having the condition lever in FLIGHT position with the power levers all the way forward, the EGT goes over the limit by about 30 degrees. I was expecting an engine "melt down" but to my surprise nothing happens. After a little bit, the EGT falls back to its limit without me touching anything. Is this normal?Thanks and best regards,

In the J41 configuration manager check to see if you enabled the options to fry your engines....JB

Thanks for the reply. Yes, that option is enabled. I can fry the engines by doing other careless things like starting the engines when the EGT is too high or advancing the throttles for TO when the conditions are still in taxi. But suppose everything is going fine and you are lined up on the runway to take off and you advance the power levers all the way forward. Then the condition I explained above occurs. I mean I am assuming the high EGT should fry the engine if its there for long enough, no? Or is 30 degrees over the limit not enough to fry the engines?

Thanks for the reply. Yes, that option is enabled. I can fry the engines by doing other careless things like starting the engines when the EGT is too high or advancing the throttles for TO when the conditions are still in taxi. But suppose everything is going fine and you are lined up on the runway to take off and you advance the power levers all the way forward. Then the condition I explained above occurs. I mean I am assuming the high EGT should fry the engine if its there for long enough, no? Or is 30 degrees over the limit not enough to fry the engines?

Well to be honest, it should fry the engines. I'm flying it right now and enroute on a FSEconomy flight so I don't feel like thrashing on the plane till I land and get my VCash. But gimme an hour and I will give it a try... It would really be a shame if the Engine Simulation on the J41 doesn't allow one to toast the turbines after the engines are up and running...Like I said, gimme an hour and I will try to break em....JB

Hey boss... Before the devs come over to this thread and yell at ya for not signing your real name, you might wanna put a signature in with your real name.JB

Disregard... sorry didn't see your name...Hey, give this a shot... Try overtempin the engines at 100% rpm then try it at 99% or better yet anything below 100% and see what results you get...JB

You can go past the limits without melting an engine -- just don't do it for very long. The engine model was very carefully done, and if memory serves, was coded so that failures occur randomly when you bust a limit. There are, of course, things that will break an engine right away, as most everyone has discovered. But a few seconds over the limit and you should be okay, as long as you don't make a habit of it.

You can go past the limits without melting an engine -- just don't do it for very long. The engine model was very carefully done, and if memory serves, was coded so that failures occur randomly when you bust a limit. There are, of course, things that will break an engine right away, as most everyone has discovered. But a few seconds over the limit and you should be okay, as long as you don't make a habit of it.

Yoda, the OP said he firewalled the engine and left it there, then it apears the computers brought the engines back to the EGT limit. You don't think the engines shoulda melted?JB

Just wanted to confirm what JB said. I left both the condition and power levers all the way forward. And after about 15 20 seconds of EGT going over the limit, it comes back to around the limit. Is this really how the real thing is?EDIT: I left it there for several minutes and it went back to about 10 degrees above the limit but no engine damage.Thanks again,

Well I landed...I'm currently as I'm typing this on the ramp with the parking brake on and the power levers firewalled. At 100% RPM I'm seeing 98% torque and EGT's at the safe limits... So I kept the power levers firewalled and reduced RPM to 96%.. Egt's are at 682C and the EGT limit is at 648... Ok both engines just blew... LOL... So I had to leave the power levers firewalled and the Condition levers at 96% and after 5 minutes the engines caught fire...JB

Thanks for that JB!So while the RPM is at 100% frying an engine is not easy but once you lower it to 96-98 then damage will be done easier. Also it seems like if you go 40C over the limit then frying might happen. These are just observations so I might be mistaking somewhere.I am having a hard understanding why when the RPM is at 100% and power levers all the way forward the engines don't fry. Isn't more fuel being fed into the engines at 100% RPM and thus higher temps?

Thanks for that JB!So while the RPM is at 100% frying an engine is not easy but once you lower it to 96-98 then damage will be done easier. Also it seems like if you go 40C over the limit then frying might happen. These are just observations so I might be mistaking somewhere.I am having a hard understanding why when the RPM is at 100% and power levers all the way forward the engines don't fry. Isn't more fuel being fed into the engines at 100% RPM and thus higher temps?

It has to do with energy produced vs airflow volume/rate through the turbine core. At Higher RPM, the core is getting more "ventilation" and at higher power lever settings (more torque and more gas), the core produces more heat.. The damaging factors here, should be Overtorque (Too much twisting force being applied by the engine core to the propeller through the Gearbox) And OverTemp of the combustion and turbine section in the engine (Which would cause the metal to fatigue, expand too much and get weak)Just my humble oppinion, but it shouldn't take 5 minutes to destroy an engine at 30c-40c over the safe egt limits, especially when an 8 second hot start will damage the engine enough to shut it down.JB

If RSR wasn't busy at the races, I'm sure he'd chime in here with a bit of actual perspective. But for what it's worth, here's my (real) experience.I was in the jumpseat one morning departing DAY for IAD in the J41. The takeoff roll appeared normal, and acceleration seemed good, but at the "V1/Rotate" call, the nose wouldn't come off the runway. With about 1000 feet to go before we ran off the end of 6L and took out the localizer antenna and few car dealerships at 110kt, the Captain pushed the power levers up to the mechanical stops, and rotated the airplane.We got off the ground and started a very shallow climb, but airspeed was slow to build. We were ignoring ATC's instructions for a 180 heading, because the last thing anyone wanted to do was roll into a turn at 300ft just above the shaker.About the time I was able to return the seat cushion to it's proper position, I noticed all the flashing that was happening on the engine instruments. For at least 2.5 to 3 minutes, we climbed out with the EGT and Torque gauges showing flashing reverse video, indicating a substantial exceedance of both parameters.So, no, the engines don't blow up a few seconds after exceeding the limits. Yes, it's normal for the EGT to come back into limits if the exceedance was small. That's what the TTL system does...it will bypass up to 15% of mass fuel flow in an effort to respect the IEC generated EGT VRL.Regards,Nick

If RSR wasn't busy at the races, I'm sure he'd chime in here with a bit of actual perspective. But for what it's worth, here's my (real) experience.I was in the jumpseat one morning departing DAY for IAD in the J41. The takeoff roll appeared normal, and acceleration seemed good, but at the "V1/Rotate" call, the nose wouldn't come off the runway. With about 1000 feet to go before we ran off the end of 6L and took out the localizer antenna and few car dealerships at 110kt, the Captain pushed the power levers up to the mechanical stops, and rotated the airplane.We got off the ground and started a very shallow climb, but airspeed was slow to build. We were ignoring ATC's instructions for a 180 heading, because the last thing anyone wanted to do was roll into a turn at 300ft just above the shaker.About the time I was able to return the seat cushion to it's proper position, I noticed all the flashing that was happening on the engine instruments. For at least 2.5 to 3 minutes, we climbed out with the EGT and Torque gauges showing flashing reverse video, indicating a substantial exceedance of both parameters.So, no, the engines don't blow up a few seconds after exceeding the limits. Yes, it's normal for the EGT to come back into limits if the exceedance was small. That's what the TTL system does...it will bypass up to 15% of mass fuel flow in an effort to respect the IEC generated EGT VRL.Regards,Nick

Nick, thanks for that... It's absolutely true that most aircraft are designed with very conservative limitations, this allows the "unforseen" to not snowball into an incident. It's good to know that your hides were saved by this safety margin... Thanks for that story, it shows that indeed the engines would probably take a good 5 minutes of thrashing...By the way, did I tell ya how much I'm enjoying this plane? FSEconomy has some of my revenue flights going to small dirt strips... Not the ideal place to lay a comuter TP down and an even worse place to try and get it up... But I'm having a blast, thanks for the work you all did on the plane...JB

JB- if you own the pax terminal you can tell it that you want the flights to go to smal/med/large airports, if thats what you mean by your revenue flightsNick- did you find out what the problem was?