Iskander-M/K (SS-26 Stone):

Spoiler alert:

Arrow wrote:
Not quite. Currently, cruise missiles are returning to ICCM ranges. The new version Kh 101, 102 has a range of about 6,500. That's already an intercontinental range.

Not quite.
The real successor is the 9M730 Burevestnik nuclear cruise missile

I wrote it wrong. Several dozen seconds. Modern ICBM ballistic missiles with a range of 11,000 km have an engine phase of just over 2 minutes.

They also have three stages with three sets of engines each being smaller and lighter and pushing a smaller lighter load.

So three engine burns... are they two minutes each?

A liquid fuelled rocket like the Kh-32 can optimise its fuel burn depending on the range to the target and the flight profile chosen for the attack, and of course any air defence sites it might fly past on its way to its target... A solid rocket fuel missile like iskander has fixed fuels with fixed burn times, but you say it only uses high energy rocket fuel like no other long range solid propellant missile...

Exactly. I'll tell you something else, ICBM missiles operate for 2 to 4 minutes and then another 20 minutes fly without propulsion as MIRV warheads.

ICBMs have three rocket stages that are all used to accelerate and climb out of the atmosphere. The third stage is the warhead bus that manouvers left and right and up and down to release individual warheads in the direction of each of their targets on the flight path the missile is taking.

At an altitude of 50 km it is very thin and the drag is very small.

Have you ever stuck your hand out the window of a car in motion? In a carpark or at very low speed the force is not that noticeable, but on a motorway the force of the airflow drags you hand back. Even at 50km/h you can hold your hand out with your palm down with a flat hand and you can feel the airflow around your hand... angle your hand up or down and you can feel the very significant upwards or downwards for this creates.

Pilots flying at mach 2.8 in a MiG-31 wear all sorts of heavy pressure suit gear and one British guy whose feet were too big for the boots available wore normal shoes during a flight to 20km altitude and high speed and was told in the event he had to eject he would be landing on bloody stumps.

Even very thin air accelerated to mach 7 has force and energy... and will slow down objects in flight.

Iskander does not fly to the target with the engine burn, similarly to long-range air-to-air missiles, which fly kinetically for a significant part of the route, even the 48N6DM, or R037M. Only the Meteor has a ramjet engine on longer. However, those with standard engines

As I have explained several times, it is not efficient to use full high thrust engines as the only fuel in a rocket missile... an AIM-9 missile has a range of less than 10km at low altitude low speed launch because the thicker air limits the speed it can accelerate to and then the thicker air slows it down faster than if launched from higher faster launch platforms.

Missiles like R-27 and R-77 and R-33 use different rocket fuels to maximise performance... the high energy fuel accelerates and climbs to altitude but it burns very quickly so only having that fuel is a waste because it will only burn for a relatively short time.

The most efficient flight performance is achieved by something like the Kh-32 which has two rocket exhausts... you can see them on the rear of the missile... it is teh same for the Kh-22M that it is based on, but the Kh-32 has more powerful fuel.

The powerful fuel is burned to allow the missile to climb to altitude and accelerate to high speed, but if it only had that thrust setting it would not go very far.... think of it as a fighter using full AB to take off and climb to altitude... if it is an Su-7 fighter it can operate its AB for about 7 minutes and then it is out of fuel. If it uses the AB to take off quickly and climbs to 10km altitude and then reduces throttle to maybe 60% thrust it can cruise to a much greater flight range than if it used full power all the way.

Iskander does not need full power thrust all the way to the target... 30-40 seconds of full thrust will get it off the ground and accelerating to a decent altitude and speed of mach 6 to mach 7... but then instead of another 20 seconds worth of the same rocket fuel, it starts burning a lower energy fuel that essentially acts like a base bleed system on an artillery shell that reduces drag to close to zero so it can coast and high speed for several minutes.... it keeps the flight speed high and the longer it does this the better the flight range, but in the case of the Iskander it is not about extra range it is about being able to manouver at very high speeds and high altitudes to evade threats using tiny little low drag control surfaces like those you see on Patriot or even S-300.

Even the fins on AMRAAM are rather small and would struggle to manouer with a missile using thrust vectoring.

You can also see that the Iskander E does not have those thrusters engines. You can see that the export version has limited maneuvering.

What small thrusters?

Ok so you still believe those fins are fixed. From an engineering perspective - wouldn't it be far more simple and efficient to just weld the whole base of the fin to the missile's body if that was the case?

No. Normal air to air and air to ground missiles have fixed and moving control surfaces removed for storage and transport and have them attached before loading them onto aircraft. Wielded fins add extra size to the storage container.

Those two programs you mentioned were pale in comparison to what the Soviets had at the time - so not even worth mentioning!

No argument from me there.

Unfortunately the ICCM's proved obsolete very quickly with the advent of the ICBM.

They proved obsolete because ICBMs were too fast to intercept and could achieve better range by leaving the drag of the atmosphere.

A modern version using nuclear propulsion, like Thunderbird, or a scramjet powered missile that could fly very high and only carry fuel instead of having to carry fuel and oxidiser like a rocket needs to means they make rather more sense now.

It is like the difference between trying to track an artillery shell and trying to track a bomber aircraft.

In fact having thrust vectoring engine exhausts as part of the scramjet motor means you could probably do away with all external fins and strakes... further reducing drag and improving performance.

Not quite. Currently, cruise missiles are returning to ICCM ranges. The new version Kh 101, 102 has a range of about 6,500. That's already an intercontinental range.

Thunderbird has essentially unlimited range too and is nuclear powered.

Iskander is tested against the world class S-300VM series. Its the shit. Overpowered shit even.

Ironic even that they are developing a simpler cheaper more basic model for general targets at greater distances.

Iskander will be excellent for enemy long range SAM sites and even ABM systems if they get in range, but for most targets a simpler cheaper missile that actually is ballistic makes more sense.

A bit like having guided artillery shells and also having conventional shells for use against area targets...

Apologies in advance for posting a conversation but it helps for clarity and perspective.

Mir wrote:Ok so you still believe those fins are fixed. From an engineering perspective - wouldn't it be far more simple and efficient to just weld the whole base of the fin to the missile's body if that was the case?

GarryB wrote:No. Normal air to air and air to ground missiles have fixed and moving control surfaces removed for storage and transport and have them attached before loading them onto aircraft. Wielded fins add extra size to the storage container.

The Iskander is transported as a complete missile as the fins are relatively small compared to to size of the missile's body.



A great picture of the size of the fins compared to the missile body. No need to remove or fold them during transport, but feel free to post images that indicate otherwise.

Now here is a excellent example of some quality engineering when it comes to fixing fins to a missile body.
The sample missile below is much smaller than the Iskander but each of the fins have two attachment points for a much stronger fix compared to the Iskander. If the Iskander fins were fixed one would have at least expected two attachment points as in the sample below - especially since the much larger Iskander is maneuvering at hypersonic speeds! Having a small single attachment point on the Iskander's fin only makes sense if it's moveable.



Btw - I have never seen those small control surfaces in the above picture in a deflected position. They must be fixed then, or have anyone seen any evidence suggesting otherwise?

The Iskander is transported as a complete missile as the fins are relatively small compared to to size of the missile's body.

Hahaha... Mr Picky, I mean in their shipping boxes, not their operational reload vehicles that transfer them directly to the launchers for launch in the field.

A great picture of the size of the fins compared to the missile body. No need to remove or fold them during transport, but feel free to post images that indicate otherwise.

Yeah, they look even smaller from space...

Btw - I have never seen those small control surfaces in the above picture in a deflected position. They must be fixed then, or have anyone seen any evidence suggesting otherwise?

Amazing photo... also evidence that the thrust vectoring blocks don't cover the exhaust so it clearly does not have thrust vectoring either.

The discussion on the Iskander missile should be moved to the relevant Iskander thread by the Mods.

A somewhat interesting translated graphic on the various trajectories utilized by the Iskander missile.

GarryB wrote:Amazing photo... also evidence that the thrust vectoring blocks don't cover the exhaust so it clearly does not have thrust vectoring either.

Good! Finally you're getting the message.  

GarryB wrote:Hahaha... Mr Picky, I mean in their shipping boxes, not their operational reload vehicles that transfer them directly to the launchers for launch in the field.

Yeah about those shipping boxes...The missile container ship with the missile as is - fins included.

GarryB wrote:Yeah, (the fins) look even smaller from space...

With a little research I've noticed that the "fins" on the Iskander missile are in fact referred to as "rudders' in Russian which itself is quite interesting, because a rudder is by definition a steerable or a moving part. Not only that, they refer to the assembly (or reinforced) block on the rudder as a "gas-dynamic rudder assembly". Conclusive evidence that the fins/rudders are moving and that they are used to steer or direct the missile during atmospheric flight.

Please also note the steerable nozzle. It's pretty clear that the Iskander use various/multiple means of steering and guidance for the missile to hit its target with extreme precision. The method of steering depends on the choice of flight trajectory.

lyle6 wrote:
You put a high guard an Iskander will uppercut you from down low. Defend against a low attack and the other missile will elbow you from above.

The new Iskander-K GLCM variant (9M729) will have 4 missiles per launcher - some sources say 6. These will be a deadly long range combo with the Iskander-1000.

Yeah about those shipping boxes...The missile container ship with the missile as is - fins included.

A control surface would be vulnerable to impact damage and would be attached later. When lifted out of its container and into the launcher or transport vehicle a 4 ton missile hanging from a crane lightly impacting something during handling would rip a control surface off or damage it.

A stabiliser fin on the other hand...

A somewhat interesting translated graphic on the various trajectories utilized by the Iskander missile.

Some guy makes a diagram suggesting extending the range if the missile by adding a lofted trajectory component outside the atmosphere (which would be about 100km or so) and you think this is proof of something?

With a little research I've noticed that the "fins" on the Iskander missile are in fact referred to as "rudders' in Russian which itself is quite interesting, because a rudder is by definition a steerable or a moving part.

Or a mistranslation of keel or stabiliser.

You put a high guard an Iskander will uppercut you from down low. Defend against a low attack and the other missile will elbow you from above.

That might have been an original plan but with experience it is pretty clear that both missiles are going to reach their target anyway.

That drawing from 2021 looks like a suggestion to extend the range of the Iskander beyond the 500km design limitation by using a lofted trajectory up into space.

GarryB wrote:Or a mistranslation of keel or stabiliser.

Perhaps your Russian is better than your English grammar? Care to give it a shot?



I must say from a scientific perspective the material you have provided in our discussions is pure gold  

How much thrust could those tiny thrusters have? I imagine it would only be enough to change the angle of the missile.

Well the Russian have very extensive knowledge on how to maneuver in outer space - so it should work perfectly

It would be good if the Mods could move this conversation from post 167 to the Iskander thread please.

https://www.russiadefence.net/t75p450-iskander-m-k-ss-26-stone

Yes, that's true. The apogee of the parabola is about 50 km.

Its flight path is not a parabola because it is not a ballistic missile.

Look up the meaning of quasi in the term quasi ballistic.

Mir produced a drawing claiming to show an alternative ballistic flight path where the missile leaves the atmosphere which might be used to extend flight range, but it is the lower flight path that the missile is used with normally.

Other posts of this topic have been moved along with the Iskander thread to the Russian Army section where it belongs...

Here.

Thanks GarryB for moving all the stuff. Made a slight mistake though

I should have asked "from post 162" and not post 167. Would be nice if you could include those as well, but no biggie if you can't.

ALAMO wrote:It seems that Iskander proved to be so much overkill for the western supplied AD assets, that Russkie started to produce a downgraded version of it.



It lacks the countermeasures dispensers.

I've had a look at this thread and spotted this post above. The still is from Combat Approved - I think.

Anyway that clip actually shows an older missile design. It's the Iskander-E, but it even has an older history. It dates back to about 1991 and was an experimental version of the Iskander known as 9P760 and it was based on the BAZ-6954 chassis. The 9P760 only had one missile ready for launch.



Better pick of the Iskander-E missile.



However this one below may just be the actual downgraded missile - or maybe NOT?  
The fins or rudders are the same as on the Iskander-E.
Perhaps even the elusive optical guided version?

Those aren't manouvering jets... those are locations for Decoys...



Missiles that use thrusters for manouvering have side facing rockets to rotate the missile or vehicle, having thruster rockets facing backwards like that would have no effect on the manouvering of the vehicle in practical terms.

Those are tubes for ejecting drone jammers that fall with the missile and maintain a trajectory and likely have a few corner reflectors inside as well as electronic emitters pretending to be the Iskander missile in the hopes the enemy air defence will hit it instead of the actual missile.