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F/A-18 Rudders: Question  
User currently offlineLoran From Germany, joined Jul 2005, 554 posts, RR: 4
Posted (8 years 7 months 6 days 4 hours ago) and read 3162 times:


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Please take a close look at the two rudders on the vertical fins, they are both deflected inwards. What is the reason for this configuration? I have seen videos from carrier takeoffs, where they seem to go back into normal position shortly after leaving the deck of the ship. I haven't seen this on the F-14s, neither on any other fighter.

Regards,
Loran


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4 replies: All unread, jump to last
 
User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 1, posted (8 years 7 months 6 days 4 hours ago) and read 3152 times:

When the F-18 was being developed it was discovered it's approach speed was a bit to high. One of the fixes was to program the rudders inboard. On the F-14 with it's long wing span and full span flaps this was not needed.

User currently offlineUsnseallt82 From United States of America, joined Jan 2004, 4891 posts, RR: 52
Reply 2, posted (8 years 7 months 6 days 3 hours ago) and read 3149 times:

Quoting LMP737 (Reply 1):
When the F-18 was being developed it was discovered it's approach speed was a bit to high.

I was going to say the same thing. From what I understand, the aerodynamics of the aircraft are so good that it doesn't induce the normal amount of drag that most others do. This is good for enroute portions of flight, but you need the drag on approach. Therefore, the stabs come inward to provide a vertical-flap type of system.

The only concern I have with this picture is that its at full power, with the burners lit. I can't see why the rudders would come inward at this power setting, unless the rudders are programmed to come in during regular flap settings, as you can see those are still deployed. If that's the case, then it makes sense because he would still have his flaps deployed from the previous approach. Looks like this guy just missed the wire or did a touch and go.

Hope this helps.



Crye me a river
User currently offlineBrendows From Norway, joined Apr 2006, 1020 posts, RR: 4
Reply 3, posted (8 years 7 months 6 days 3 hours ago) and read 3146 times:

Quoting Loran (Thread starter):
Please take a close look at the two rudders on the vertical fins, they are both deflected inwards. What is the reason for this configuration?

The question has come up here before. IIRC, some answered that the rudders are put in this position to help the elevators with pushing the nose up on takeoff.


User currently offlineFtrguy From United States of America, joined Aug 2003, 358 posts, RR: 0
Reply 4, posted (8 years 7 months 5 days 23 hours ago) and read 3108 times:

Quoting Brendows (Reply 3):
the rudders are put in this position to help the elevators with pushing the nose up on takeoff.

Brendows is correct. They create a lifting moment on the nose for takeoff. It you were to see the hornet in the picture above a split second later, you would have noticed that the rudders went back to their normal position. They only toe-in when you are on the ground and have the flaps down (1/2 or Full).


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