New Iranian two-stage solid propellant missile "Sejil"
-- the renamed "Ashura" (Ghadr-110) --

Norbert Brügge, Germany
 

TEHRAN, 2007, Nov. 27 --- Iran has built a new longer-range ballistic missile named "Ashura" with a range of 2,000 kilometers , the defense minister Mostafa Mohammad Najjar said.
TEHRAN, 2008, Nov. 12 --- Iran test fired a new generation of ground-to-ground missile, the defence minister Mostafa Mohammad Najjar as said. "This is a two-stage missile carrying two engines with combined solid fuel," Najjar said, adding that the missile was named "Sejil".
TEHRAN, 2008, Nov. 18 --- Iran flew its new missile for the second time. Iran's defense Minister Mustafa Najjer was sufficiently satisfied to release impressive video footage showing what was clearly a previously unknown large multistage ballistic missile roaring off a mobile launcher. In a series of interviews after the test, Najjer stressed that the new "Ashura" missile is renamed "Sejil", and had a range of more then 2,000 kilometers and that it was a two-stage design, powered by composite solid-propellant rocket motors.
TEHRAN, 2009, May 20 --- Iranian President Mahmoud Ahmadinejad said that the country successfully launched an advanced surface-to-surface missile Sejil-2 with a range of about 2,000 km, the official IRNA news agency reported.
The Sejil missiles use solid fuel and perform in two stages.
TEHRAN, 2009, Dec. 16 --- Iran has successfully tested an optimized version of the solid-fuel Sejil-2 missile. This new version of the Sejil-2 is faster during the powered flight portion of its trajectory and also during the re-entry phase. It is also harder to detect for anti-missile systems, as it is covered with anti-radar material. The new highly maneuverable missile is also more efficient as it requires less amount of time for prelaunch preparations. The engine and various fuels have been tested and the platform is now highly reliable.

Against first conjectures is this new large Iranian two-stage solid propellant missile "Sejil" not based on Chinese Dong Feng  missiles DF-11 or DF-15 because the diameter is approximately 1.25 m and not 0.88 or 1.10 m. An affinity to the Chinese M-18 (Pakistani Shaheen-2) with a diameter of 1.40 m can not be recognized also. That means that the origin is unknown up to now. It is reported that this missile was developed and produced under the leadership of the Air and Space Organization Department of the Iranian Ministry of Defense.
 

I can not believe that Iran has developed the Sejil missile without technology transfer. For other missiles, such an technology transfer was always detectable.
The little-known Soviet 5Ya27 missile and the South African “Arniston” missile (Jericho-II in Israel) are the world's known two missiles with a diameter of about 1.3 m. The Arniston (Jericho-II) missile is not more in consideration, after a objection by Israeli experts.
 

 It is likely that the Sejil based on older  Soviet technology
e.g. OKB Fakel 5Ya27 ABM     >>>>>>>>>>>


A military truck carries a Sejil missile during the military parade Tehran on September 22, 2009


      



              


     


         
         Pressure gas boxes for first stage thrusters                                             Second stage thrusters with four boxes                                       Pipeline and covered thrusters




      


  


               

  

Rear with open boxes

Sejil motor nozzle ?


   
 

On the Sejil missile are visible four unusually large boxes at the base of both stages of the rocket. They contain probably high-pressure-gas or hydrazine. From these tanks the filling is supplied to thrusters in the middle part of the first stage and at low end of the second stage. The thrusters are activates to stabilize the flight of the rocket, as well as with the intent of avoidance of a potentially collision after separation from the first stage, before the second stage ignites
On the pictures below, is to see that the boxes are closed by plates. It is now clear that the jet vanes are welded on the plates.




Sejil missile in launch position



 


     
 

                                        Sample calculation

Stage

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Burn time

Combustion

Total Imp

kN

N*s/kg

kN

N*s/kg

tons

s

t/s

MN*s

1

521.6 2158 592.5 2452 14.50 60 0.2417 35.5
2     170.8 2481 5.50 80 0.0688 13.6

That's new

Recently there was a missile exhibition in Tehran and for the first time there are exact specifications for several of Iran's missiles such as the Ghadr-I (called the Ghadr-F in Iran) and the Sejil missiles. Also Iran displayed the specifications for the Qiam-1 and Shahab-2 as well. These have been accompanied by images. Also of interest is excellent close up images of the Sejil's engine exhaust area, showing it uses jet vanes.

Here is the link to said information:
http://aboutiranblog.blogspot.com/2011/10/scared-defence-exhibition-in-baharestan_30.html


Sejil
Max. Range: 2000 km
Total Weight: 23,623 kg
Length: 17.57 m
Diameter: 1.25 m
Warhead Weight: 500 kg
Propellant: Solid Fuel
Flight Time: 835 s
Flight Path: Ballistic