Speedbrake question

[happydude]

Hey everyone! When are speedbrakes normally used in jets? Are they deployed just before landing or after? Thanks in advance

Earl

[rtriez]

....toward the bottom - http://www.hq.nasa.gov/office/pao/Hi...468/ch10-5.htm

Also from the manual -


http://www.flightsim.com/dcforum/Use...956dabe75e.jpg


If you need to descend rapidly and need to control your airspeed, you can use them in flight. Or on a full configured approach, they are often deployed upon touchdown to "spoil" lift and help slow the plane. Shift + / will set them for auto deploy.



Best Regards,

Bob

[happydude]

Wow, thanks for the prompt reply. Very good link you got there. Thanks for the help Bob

Earl

[cactuscap]

Earl,

Depending on the airplane, the increase in descent rate - even with full deployment of the spoilers – can be minimal.

The devices “spoil” life, causing an increase in drag. Therefore you can descend at a similar indicated airspeed, but at a somewhat greater rate. Or, their use can aid in a speed reduction, while maintaining a similar rate of descent. Also, the speedbrakes are more beneficial at a higher indicated speed than slower.

Lastly, the speedbrakes can very helpful during landing roll. The downward pressure created will place all of the aircraft weight on the wheels, allowing the tires and brakes to aid in deceleration; on contaminated runways, friction may be lost otherwise.

Sean

Ps. The spoilers in MSFS are far more effective than on most real jets.

[rtriez]

>> The devices “spoil” life

They're only speed brakes man, no need to get so philosophical about it :-lol

Sorry, couldn't resist playing on your typo :-lol


Best Regards,

Bob

[coolian2]

>Sorry, couldn't resist playing on your
>typo :-lol

I could have sworn that was my typo to mention.....






[font color= blue][b]
coolian2
Auckland, New Zealand
coolian2@hotmail.com
http://www.flightsim.com/dcforum/Use...6b02a031df.jpg

[cactuscap]

>>The devices “spoil” life …<<

Darn, I have gotta spend more tim prof reeding befor hitting the pst buton!

However, if you were a molecule of air, it could spoil your life.

Regards,

Sean