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Old 28th Aug 2012, 18:41   #1 (permalink)
 
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Iran 'pimps' Tu-154 - for F-5 ejection seat tests

Bizarre story of the day on a Flight International blog:-

Quote:
Just when we thought that Iran couldn't do anything else crazy linked to its aged fleet of Northrop F-5 fighters (following its foray into developing the V-tailed "Saegeh" version), a newly published image has raised many eyebrows here on Flightglobal.

Hosted on the Airliners.net site, the picture shows a modified Tupolev Tu-154M, formerly flown by Iran Air Tours, with an F-5 cockpit section now grafted onto the front-top of its vertical stabiliser. Image supplier "Iranian Spotters" describes the combo as intended to support tests of an Iranian-made ejection seat, and says the same aircraft will also carry out future work carrying indigenous unmanned air vehicles.
If you do one thing today, check out the image here.
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Old 28th Aug 2012, 18:45   #2 (permalink)
 
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Bizzare, putting it mildly.
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Old 28th Aug 2012, 18:52   #3 (permalink)
 
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Rather resourceful and with no vertical obstructions in the way a good way to test the seat. Would like to see the airflow once the canopy has gone but at first look this looks viable to me.

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Old 28th Aug 2012, 19:01   #4 (permalink)
 
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Getting into it looks to be challenge enough but once there it will be the best view in the house!
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Old 28th Aug 2012, 19:22   #5 (permalink)
 
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Wouldn't it have been easier to use a rocket sled for seat trials?
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Old 28th Aug 2012, 19:34   #6 (permalink)


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They've been watching Thunderbirds
Its their version of the Fireflash!
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Old 28th Aug 2012, 19:35   #7 (permalink)
 
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If it is possible to control (fly by wire) the entire aircraft from that cockpit, this could give rise to some pretty scary weaponry, of the kind trialled by the japanese in 1945.
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Old 28th Aug 2012, 20:10   #8 (permalink)
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Close escort fighter?
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Old 28th Aug 2012, 20:23   #9 (permalink)
 
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First test ejection could see the entire tail section deprting company withthe test bed. Think about it.
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Old 28th Aug 2012, 20:31   #10 (permalink)
 
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Courtney
One would hope that they do a few ground tests first with
some dummies ?

PM sent.

Last edited by 500N; 28th Aug 2012 at 20:32.
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Old 28th Aug 2012, 20:32   #11 (permalink)
 
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From another website: (No mention of ejector seats)


On Aug. 21, the first avionics and radar testbed for what it’s thought to be the Saeqeh V fighter jet, made a sudden appearance on the images taken during the presentation of six types of new military equipment held in Tehran.

In fact, according to FARS, the aircraft was showcased during a presentation that included the fourth generation of Fateh 110 missile, Bonian 4 marine engine, Armita space test laboratory, Aras tactical vehicle, Vafa mortar-launcher, and Shahed navigation system.

The front section of the new fighter (an advanced version of the Saeqeh, a modified F-5 with Hornet-like tails) is attached to the tail of a Tu-154 testbed that will be used for high speed tests.

Although we don’t know anything of this “new” aircraft, the military significance of this alleged next generation plane is at least questionable. However, this experimental plane shows that the Iranian aerospace industry is quite active, not only on UAV (Unmanned Aerial Vehicle) technologies.
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Old 28th Aug 2012, 20:39   #12 (permalink)
 
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That would be a shame, my friend, 500N. I could say that a sensible nation that was resourcing a proper bang seat reasearch programme would do even more testing and engineering before the first trails. But this is a nation who are happy to do the most audatious engineering jobs - you have to admire them for that.

My guess is that, without a lot of internal structural work, the first bang will put a huge moment on the front of the fin and rear fuselage. The resulting, gaping hole will create some interesting aerodymic characteristics and, if that doesn't do it, any subsequent tests will simply compound the damage. If they do some ground tests first, the damage will be there already.

I hope they put the trial videos on You Tube.

Last edited by Courtney Mil; 28th Aug 2012 at 20:40.
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Old 28th Aug 2012, 20:40   #13 (permalink)
 
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Quote:
If it is possible to control (fly by wire) the entire aircraft from that cockpit, this could give rise to some pretty scary weaponry, of the kind trialled by the japanese in 1945.
AND the Luftwaffe...not forgetting the Americans.
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Old 28th Aug 2012, 20:42   #14 (permalink)
 
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Surely the fuselage fore-section is going to induce both an adverse tortional bending moment on the fin structure and a destabilising lateral stability characteristic on the host aircraft?

I'm not sure of the weight of a bang seat, but that much weight so far aft of the CG suddenly released on test would probably induce quite an interesting transient pitching moment.

But if it all works, it'll have been a very clever idea.
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Old 28th Aug 2012, 21:16   #15 (permalink)
 
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Buccaneer fitted with rearward firing missile ring a bell......?
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Old 28th Aug 2012, 21:27   #16 (permalink)
 
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Give it a set of rotor blades, a ramp, a smoke generator and hang some weapons under the horizontal stabiliser. They could sell it to the UK as "an entire air force in one airframe". The beancounters would jump at it!

Last edited by Easy Street; 28th Aug 2012 at 21:28.
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Old 28th Aug 2012, 21:37   #17 (permalink)
 
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I wonder if they added some ballast forward of the CG to compensate for the weight. Likewise, I wonder if they beefed up the tail section to accomodate some of the odd loads the vertical stab might see when the plane turns.

Interesting idea for a test bed, if they've thought through some of the engineering bits.
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Old 29th Aug 2012, 10:22   #18 (permalink)
 
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Don't let O'Leary see that. Imagine how much he could charge for an upgrade to the first class seat.

I too have visions of the F5+tailpane departing company from the Tu154 the first time they do a live ejection. I know Tupolevs are built like Brunel's bridges but surely it's not stressed for this kind of thing.
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Old 29th Aug 2012, 11:15   #19 (permalink)
 
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Interesting - look closely at the cockpit; it looks to me that the "bullet" atop the Tu-154's fin is actually protruding into the rear of it. Also, there is a small lump on the upper nose of the cockpit - wonder what that's for? The Iranians have long been known for some clever reverse engineering and also for even cleverer bluffing....
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Old 29th Aug 2012, 11:21   #20 (permalink)
 
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Started as an air-to-air refuelling accident and they decided to keep it!

KB
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