aeg13 Posted December 28, 2019 Posted December 28, 2019 So I’m really enjoying the JF-17. It’s wonderful, especially in VR with the big readable MFDs. I keep wondering about fuel economy, speeds and engine wear... My question is actually two-fold: 1. When the guages in RPM (N2) and exhaust gas temperature (T4) turn yellow and orange. What does this mean? Is it something we need to take into account? 2. When operating the craft, I’ve read in Chuck’s guide that we should takeoff using 90% RPM for light loads, and AB when needed for heavy load. But then we climb out and cruise. Do we climb out at a certain RPM or just as we see fit?
L0op8ack Posted December 28, 2019 Posted December 28, 2019 1. there is a T4 limit, should not exceed this limit. T4 and N2 are affected by T1. 2. cruise @0.8M at 8,000m - 10,000m
Tiger-II Posted December 29, 2019 Posted December 29, 2019 It means it's reaching its limit but not yet exceeded it. I've run it for a long time at MIL without incident. If you slam accelerate the engine it can also cause it to overshoot its target RPM and consequently parameters can become red/exceeded, but I only achieved this by setting COMBAT mode. That extra 1% RPM makes a difference. As for takeoff, I do all takeoffs at MIL, then depending on weight and keeping an eye on acceleration through the takeoff roll I apply max AB at around 120 kts until I'm airborne and climbing nicely at around 250 kts, where I come out of AB and continue at MIL. In most configurations I find MIL to be more than adequate. Manage your speed with pitch, and she'll reward you with good fuel economy. I've actually found oxygen quantity to be the limiting factor on flights with a longer ingress. I read that people say she's "short-legged". Only if you make lots of use of the afterburner and don't manage your energy. Learn to fly smooth and at the right speeds for the situation, and you'll have no problem. I would be interested in knowing the idle fuel flow when sat on the ground. I don't see fuel flow displayed anywhere. Motorola 68000 | 1 Mb | Debug port "When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover. The JF-17 is not better than the F-16; it's different. It's how you fly that counts. "An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."
AeriaGloria Posted December 30, 2019 Posted December 30, 2019 I’ve gotten an engine warning before from going over limit with a load, I think it duped up as EDU Black Shark Den Squadron Member: We are open to new recruits, click here to check us out or apply to join! https://blacksharkden.com
L0op8ack Posted December 30, 2019 Posted December 30, 2019 It means it's reaching its limit but not yet exceeded it. I've run it for a long time at MIL without incident. If you slam accelerate the engine it can also cause it to overshoot its target RPM and consequently parameters can become red/exceeded, but I only achieved this by setting COMBAT mode. That extra 1% RPM makes a difference. As for takeoff, I do all takeoffs at MIL, then depending on weight and keeping an eye on acceleration through the takeoff roll I apply max AB at around 120 kts until I'm airborne and climbing nicely at around 250 kts, where I come out of AB and continue at MIL. In most configurations I find MIL to be more than adequate. Manage your speed with pitch, and she'll reward you with good fuel economy. I've actually found oxygen quantity to be the limiting factor on flights with a longer ingress. I read that people say she's "short-legged". Only if you make lots of use of the afterburner and don't manage your energy. Learn to fly smooth and at the right speeds for the situation, and you'll have no problem. I would be interested in knowing the idle fuel flow when sat on the ground. I don't see fuel flow displayed anywhere. about oxygen, you need not turn oxygen 100% on if you cruise at med altitude. turn it fully on only at heigh altitude or ready to fence in, you will save a lot oxygen.
Tiger-II Posted December 30, 2019 Posted December 30, 2019 about oxygen, you need not turn oxygen 100% on if you cruise at med altitude. turn it fully on only at heigh altitude or ready to fence in, you will save a lot oxygen. Interesting! Thank you! Motorola 68000 | 1 Mb | Debug port "When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover. The JF-17 is not better than the F-16; it's different. It's how you fly that counts. "An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."
[VFA-106] Glacier Posted December 30, 2019 Posted December 30, 2019 about oxygen, you need not turn oxygen 100% on if you cruise at med altitude. turn it fully on only at heigh altitude or ready to fence in, you will save a lot oxygen. Nice! I'm impressed that you modeled gas flow rates.
[VFA-106] Glacier Posted December 30, 2019 Posted December 30, 2019 I read that people say she's "short-legged". Only if you make lots of use of the afterburner and don't manage your energy. Learn to fly smooth and at the right speeds for the situation, and you'll have no problem. I was initially one of those people, but yeah, I learned how to easily manage it. My default setup is now Engine - TRG and A/B - Off, which has resulted in a very noticeable reduction in fuel consumption.
Kumabit Posted December 30, 2019 Posted December 30, 2019 about oxygen, you need not turn oxygen 100% on if you cruise at med altitude. turn it fully on only at heigh altitude or ready to fence in, you will save a lot oxygen. A quick question, how can I know how much oxygen left in the tank?
Tiger-II Posted January 1, 2020 Posted January 1, 2020 A quick question, how can I know how much oxygen left in the tank? Look to the right and down of the right MFD. There are two analog instruments in front of where you switch on the power. The left instrument (single needle) shows oxygen pressure in psi x 100. It starts at about 22(00) psi. Motorola 68000 | 1 Mb | Debug port "When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover. The JF-17 is not better than the F-16; it's different. It's how you fly that counts. "An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."
Tiger-II Posted January 1, 2020 Posted January 1, 2020 about oxygen, you need not turn oxygen 100% on if you cruise at med altitude. turn it fully on only at heigh altitude or ready to fence in, you will save a lot oxygen. I see! Great!! Thanks! Motorola 68000 | 1 Mb | Debug port "When performing a forced landing, fly the aircraft as far into the crash as possible." - Bob Hoover. The JF-17 is not better than the F-16; it's different. It's how you fly that counts. "An average aircraft with a skilled pilot, will out-perform the superior aircraft with an average pilot."
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