F-35C SpeedBrake-Ailerons? Rudder, Front & Rear Flaps

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by spazsinbad » 26 Nov 2010, 04:37

Looks like the F-35C uses ailerons as well as rudders and leading- trailing edge flaps for speedbrake - or do I see this photo incorrectly?

“On the F-35, speed brake functionality is provided through the use of the rudders & leading- and trailing-edge flaps.”

http://www.codeonemagazine.com/article.html?item_id=28

http://www.codeonemagazine.com/images/m ... 7_4142.JPG

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by underhill » 26 Nov 2010, 14:54

Interesting picture, Spaz, which raises a question as to what you do for speedbrake functions on the A and B, which don't have separate ailerons.
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by jetnerd » 26 Nov 2010, 17:23

In an interview between John Beesly and Code One magazine, 15 Jun 2007, I'm guessing that the FLCS directs the rudders to rudders deflect outwards on the A & B, in conjunction with LEF/TEF actions mentioned here. Here's the quote from the article. I tried to link but I got "invalid session" error.

"The F-35, like the F-22, doesn't have a dedicated speed brake like most previous fighters. Instead, it decelerates through the flight control software by deflecting control surfaces in the same manner as the Raptor. We use the leading-edge flaps as well as the trailing-edge flaps and the rudders to slow the airplane. Unlike the F-22, the F-35A and F-35B have no ailerons. That explains why it uses a combination of leading- and trailing-edge flaps and rudders to slow down."

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by spazsinbad » 26 Nov 2010, 23:50

F-35 Lightning II Flight Tests By Eric Hehs Posted 15 June 2007

http://www.codeonemagazine.com/article.html?item_id=33

Same 'jetnerd' reference copy/pasted (thanks): "On Flight 7, we evaluated the speed brake operation. The F-35, like the F-22, doesn't have a dedicated speed brake like most previous fighters. Instead, it decelerates through the flight control software by deflecting control surfaces in the same manner as the Raptor. We use the leading-edge flaps as well as the trailing-edge flaps and the rudders to slow the airplane. Unlike the F-22, the F-35A and F-35B have no ailerons. That explains why it uses a combination of leading- and trailing-edge flaps and rudders to slow down. I found that the buffet levels were very low, essentially the same as buffet levels of the F-16 with the speed brake in operation. Deceleration rates in the F-35 are similar to the F-16 as well, which is a design goal."


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by underhill » 27 Nov 2010, 13:20

I should imagine that decelerating is something that the Super-SLUF does quite well.
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by spazsinbad » 27 Nov 2010, 14:07

UH, Well then I'll imagine that your Sluffing Super likely accelerates equally well with the giant single engine?


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by brancwp » 04 Dec 2010, 00:37

The rudders toe in for speedbrake application. Unfortunately it does not slow us down as much as we would like.


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by spazsinbad » 04 Dec 2010, 01:06

Completely OFF Topic and Counter Intuitive but relevant in the sense that some people argue the opposite - so this is for the FutureStealthySLUF squabbles:

‘Effect of Wind Over Deck Conditions on A/C Approach Speeds for Carrier Landings 1991 (1.2Mb)

NOW 2 pages from PDF below

http://www.google.com/url?sa=t&source=w ... SlZJyW6asw
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Last edited by spazsinbad on 04 Dec 2010, 04:12, edited 1 time in total.


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by spazsinbad » 04 Dec 2010, 01:46

Because it is not easy to find (NATOPS) Limits for some current USN aircraft here are the WOD limits (including Deck Pitch) for the T-45C Goshawk. Note that only a foot in Deck Pitch height separates the Students from others using the T-45C:

http://www.tpub.com/content/aviation2/3 ... &40021.htm
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