Jet engine thrust and response times

[seagull967]

I am trying to find information to ascertain the amount of thrust a large turbofan puts out at typical approach speeds vs. power settings, from idle to TOGA, as well as response times from idle to various points. Does anyone have a pointer to where I could obtain such data?

Thank you.

[deptrai]

Re response time, Google airbus safety lib Flt ops appr seq03
Page 7.sorry phone stubbpenny refuses to paste link

[barit1]

The engines of B-47 (or XB-47) vintage were notoriously slow in spoolup. I see little correlation to seagull967 and his "large turbofan engine" question.

[seagull967]

Wow, thank you both for that!

Here are a couple of links I found on the topic to help others who may be interested, the second one is the link that deptrai provided the pointer to:

docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1072&context=jate

http://www.airbus.com/fileadmin/media_gallery/files/safety_library_items/AirbusSafetyLib_-FLT_OPS-APPR-SEQ03.pdf

[barit1]

Thanks for the links, seagull967
Energy management as a topic for instruction is IMHO long overdue. Some pilots learn this intuitively and empirically, others seem to rely on the go-handle much more.

Sailplane pilots must learn energy management early on, and they have a superb little instrument to help them - the total energy variometer (http://aviation.stackexchange.com/questions/7697/how-does-an-energy-variometer-work).

[Amadis of Gaul]

When words like "empirically" start getting thrown around, that's when you know stuff's about to get real.

[Turbine D]

From the FAA Code of Federal Regulations:

Part 33 AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES
Subpart E--Design and Construction; Turbine Aircraft Engines

Sec. 33.73

Power or thrust response.

[The design and construction of the engine must enable an increase--
(a) From minimum to rated takeoff power or thrust with the maximum bleed air and power extraction to be permitted in an aircraft, without overtemperature, surge, stall, or other detrimental factors occurring to the engine whenever the power control lever is moved from the minimum to the maximum position in not more than 1 second, except that the Administrator may allow additional time increments for different regimes of control operation requiring control scheduling; and
(b) From the fixed minimum flight idle power lever position when provided, or if not provided, from not more than 15 percent of the rated takeoff power or thrust available to 95 percent rated takeoff power or thrust in not over 5 seconds. The 5-second power or thrust response must occur from a stabilized static condition using only the bleed air and accessories loads necessary to run the engine. This takeoff rating is specified by the applicant and need not include thrust augmentation.]


Amdt. 33-4, Eff. 4/23/71