Flight Planning Question.

[umop apisdn]

Hi everyone. I'm tackling flight planning at the moment. Just missed out by 2 marks!

Anyway...

I was wondering if anyone knows where I can find minimum drag speeds for the 727? I have flicked very slowly all the way through the book and can't find anything, nor any reference in any of my texts. I thought it would, logically, be the LRC speed, but that didn't seem to work.

Also, if there is anyone currently tackling flight planning in the Melbourne area, would be happy to meet up and have a study sesh.

[DirectAnywhere]

If there is a question relating to minimum drag they are pointing you in the direction of the holding tables. Minimum Drag = Minimum Thrust = Minimum fuel flow = Holding.

Long Range Cruise is a function of Max Range Cruise and is not directly related to minimum drag speed.

Regarding Long Range Cruise

AERO - Fuel Conservation Strategies: Cruise Flight (http://www.boeing.com/commercial/aeromagazine/articles/qtr_4_07/article_05_2.html)

LRC has been historically defined as the speed above MRC that will result in a 1 percent decrease in fuel mileage in terms of nautical miles per kilogram or pound of fuel burned. The classic text, Aerodynamics for Naval Aviators, revised in 1965, states: "Most long-range cruise operation is conducted at the flight condition which provides 99 percent of the absolute maximum specific range. The advantage is that 1 percent of range is traded for 3 to 5 percent higher cruise velocity. Since higher cruise speed has a great number of advantages, the small sacrifice of range is a fair bargain." This concept is graphically illustrated in figure 1.

[umop apisdn]

Thanks a lot for your reply. If only i'd seen it there written clearly on the page! Oh well. Next time :)