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Old 05-11-2019, 06:57 PM   #1
The AMRAAMer
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Default Good Climb Rate

After take off when you're heading to the AO, what's a good, consistent, climb rate? Is there one value for all aircraft? If not, what's a good climb rate for the F15 and other fighters like it?
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Old 05-11-2019, 08:59 PM   #2
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For F-15C: what nighthawk2174 says below - it's from the -1. For other aircraft it's different.

Last edited by draconus; 05-13-2019 at 10:13 AM.
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Old 05-11-2019, 11:46 PM   #3
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"If at MIL power, climb at 350 knots to 0.90 Mach, then maintain 0.90 Mach. If at MAX power, climb at 350 knots to 0.95 Mach. If Mach increases above 0.95 at 40° pitch attitude, hold 40° and allow the Mach to increase (Mach will rise only slightly before returning to 0.95). "
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Old 05-24-2019, 02:19 AM   #4
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Quote:
Originally Posted by nighthawk2174 View Post
"If at MIL power, climb at 350 knots to 0.90 Mach, then maintain 0.90 Mach. If at MAX power, climb at 350 knots to 0.95 Mach. If Mach increases above 0.95 at 40° pitch attitude, hold 40° and allow the Mach to increase (Mach will rise only slightly before returning to 0.95). "
Where can I find these values for other aircraft? If you have them on hand for the A10, F14 and F16 can you provide? Thank you
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Old 06-12-2019, 07:43 PM   #5
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Quote:
Originally Posted by nighthawk2174 View Post
"If at MIL power, climb at 350 knots to 0.90 Mach, then maintain 0.90 Mach. If at MAX power, climb at 350 knots to 0.95 Mach. If Mach increases above 0.95 at 40° pitch attitude, hold 40° and allow the Mach to increase (Mach will rise only slightly before returning to 0.95). "
Did you pull those from Mig-29 Manual? Is that Max rate or Cruise climb?
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Old 06-12-2019, 07:48 PM   #6
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Quote:
Originally Posted by Kazansky222 View Post
Is that Max rate or Cruise climb?
Only if you are using less than MIL/MAX power it's a 'cruise' climb.
Since jet engines are using a lot of fuel at lower altitude you usually climb with max climb power in all jets.
The above speeds are for the F-15C.

350 is surprisingly low for a MAX power climb since e.g. the optimum climb speed for the F-5E in clean config is 590kts / M0.93.

Last edited by bbrz; 06-12-2019 at 08:02 PM.
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Old 06-12-2019, 08:50 PM   #7
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350Kts is the optimum climb speed for minimizing fuel-to-altitude IIRC.
Yours is minimizing time-to-altitude and is used in difference circumstances.

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Originally Posted by bbrz View Post
350 is surprisingly low for a MAX power climb since e.g. the optimum climb speed for the F-5E in clean config is 590kts / M0.93.
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Old 06-13-2019, 03:22 AM   #8
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Originally Posted by GGTharos View Post
350Kts is the optimum climb speed for minimizing fuel-to-altitude IIRC.
Yours is minimizing time-to-altitude and is used in difference circumstances.
Hm, I don't think so. The F-15 and the F-5E both have a single fixed climb speed schedule for MAX power, there are no other speeds/climb schedules available for different circumstances.

E.g. the F-4E and the Tornado are also much higher IAS, 595kias/M0.90.
The F-105 even needs 615/0.93 and the F104 a slightly lower 610/0.925.

What is surprising (for me) that the F-14A is a real Turkey with a climb Mach Number of 0.70 even in the clean case. That's a lot slower than every civil airliner!
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Old 06-13-2019, 08:32 AM   #9
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Quote:
Originally Posted by bbrz View Post
there are no other speeds/climb schedules available for different circumstances.
I don't know about the F-15 specifically, but generally, there are always two climb schedules: Best rate of climb and best fuel economy. Military airplanes often have a third climb schedule for AB best rate of climb.

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Originally Posted by bbrz View Post
E.g. the F-4E and the Tornado are also much higher IAS, 595kias/M0.90.
The F-105 even needs 615/0.93 and the F104 a slightly lower 610/0.925.
That M 0.7 you quoted is the best fuel economy rate of climb for the Tomcat, while the values for the F-4/Tornado are likely for AB climb. There is also an AB max rate of climb schedule for the F-14 which also prescribes M 0.9.

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Originally Posted by bbrz View Post
What is surprising (for me) that the F-14A is a real Turkey with a climb Mach Number of 0.70 even in the clean case. That's a lot slower than every civil airliner!
No surprise at all. Unlike most other fighters, the Tomcat has a high aspect ratio and can climb more efficiently than other fighters. Hence its fuel conservation climb speed is about that of commercial airliners (A320 climbs at around M 0.7/0.8 once it gets high enough).
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Old 06-13-2019, 08:39 AM   #10
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Quote:
Originally Posted by sLYFa View Post
I don't know about the F-15 specifically, but generally, there are always two climb schedules: Best rate of climb and best fuel economy. Military airplanes often have a third climb schedule for AB best rate of climb.
(A320 climbs at around M 0.7/0.8 once it gets high enough).
Can you point me to the additional climb schedules in the F-4, F-105 and Tornando flight manuals ? I didn't find any.
The (rather slow) A320 standard climb is .78 and with a high drag index the F-14 climbs at M.62, I could never fly that slow with a heavy 767!

I didn't find anything in the F-14A manual which mentions a 'best fuel economy rate of climb'. It simply 'climb speed schedule military power' which means max climb thrust and hence max ROC.
Couldn't find an AB climb schedule either in the manual.

Last edited by bbrz; 06-13-2019 at 08:45 AM.
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