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The petals served a dual purpose. First, they could be used to control the surface area of the jet pipe, much like the turkey feathers of F-15's. Second, they served as speed brakes. They had no thrust reversing function. The only tactical fighters with thrust reversers were SAAB Viggens and Panavia Tornados.Pete wrote:tomh wroteBelow we see an F-105B from the NJ ANG with Bicentennial Markings at McGuire AFB, NJ 31 May 1976/quote].
Is this one equipped with thrust vectoring devices?
Regards Pete
Thanks for your explanation Hans, the device looked similar to the one on the MBB X-31 for me. I have never seen them on a F-105 so i guessed this could be a very early stage of experimenting with thrustvectoring.Hans Rolink wrote:The petals served a dual purpose. First, they could be used to control the surface area of the jet pipe, much like the turkey feathers of F-15's. Second, they served as speed brakes. They had no thrust reversing function. The only tactical fighters with thrust reversers were SAAB Viggens and Panavia Tornados.Pete wrote:tomh wroteBelow we see an F-105B from the NJ ANG with Bicentennial Markings at McGuire AFB, NJ 31 May 1976/quote].
Is this one equipped with thrust vectoring devices?
Regards Pete
Besides, keep posting this great stuff Tom!
Hans.
Well I am learning a lot on this regular wednesday evening, your picture Tom is the first i saw of a F-105 featuring these petals, do you know if this was only used on the B model or was it wide spread in use?tomh wrote:This makes me feel good. I can post a photo that I think is only interesting because it shows somewhat unusual markings (Bicentennial). But someone else sees an aerodynamic question due to some of the detail and the angle of the shot. Then a third person provides a correct answer. Great stuff, this.
As I recall, Pete, the lower petal on the airbrake would eventually assume a near-vertical position as the jet sat on the ramp over time due to slow hydraulic pressure equalization. I'll post some photos of this.
On the thrust-vectoring: In the early 1970s, Grumman operated a very pretty white F-11A Tiger with thrust vectoring and/or reversing (Maybe both). It was no longer an operational aircraft during these tests.
Well at least they have a "similar" speed brake on the F-16 that is offering symmetrical drag at the rear of the aircraft, so not all the lessons from the past have ended up in a museum.tomh wrote: The big advantage to this design was that it offered symmetrical drag, based on the aircraft centerline, at the rear of the aircraft when applying the speed brakes. This meant fewer corrections on the part of the pilot once they were deployed. I was surprised more aircraft didn't feature this design, though I can see where it would complicated in the twin engine types.
Here is a shot of a "T-Stick II" variant of the F-105D model at Westover ARB showing the "at rest" position of the bottom petal of the speed brake
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