Queries !!

[EagleOne]

But still there are lot of advantages in using liquid propulsion just because of the ability to throttle up the missile can be made more maneuverable and also can be made smaller because of thrust. That is why asked for mixed propulsion based on the advantages of both propulsion the type of propulsion can be used in various stages as needed.
Maintaining a missile regiment is always a costly affair so with some extra maintenance we can have a deadly missile with both propellant. I dont know about the Failure rate because most of the rockets are using liquid propulsion. It is costly but the liquid propulsion is the most effective one.

well in case of rocket it can be checked at the time of launch....but this is not the case of missile
one thing liquid propelled missiles cannot be kept all the time fueled because the liquid oxygen in cyrogenic state boils off ,ice formations are the general problems (these are faced by these countries so they changed to soild fuel) that means signficant time is required to fuel them up again. this is not possible if we are already under attack (for a significant second strike),liquid propellents are effective at the same time less reliable

 

[plugwater]

well in case of rocket it can be checked at the time of launch....but this is not the case of missile
one thing liquid propelled missiles cannot be kept all the time fueled because the liquid oxygen in cyrogenic state boils off ,ice formations are the general problems (these are faced by these countries so they changed to soild fuel) that means signficant time is required to fuel them up again. this is not possible if we are already under attack (for a significant second strike),liquid propellents are effective at the same time less reliable

SS-19 stiletto is a strategic missile which is operational under Russian strategic rocket force. Strategic Missiles are always fueled and ready to go anytime, they have the least preparation time in case of nuclear war. If they have to refuel in order to launch means they wouldn't have chosen the liquid propellant missile. The matter we have to see is the Russians even have the operational solid propellant missile but they also chose the liquid propellant missile. IMO they have seen some advantages in using both kind of missiles. I really don't believe they have to refuel to launch i could say they have found a way to use the liquid propellant missile effectively.

 

[EagleOne]

well yes statergic missiles are operational and ready to go ...we cant say that they are not refuled at regular intervels
and if u follow the icbm development of russia the last icbm with liquid propellant is ss-19 after that from 1987 all the missiles they developed are solid fuel let it be ss-24,ss-25,ss27,rs29 all these are three solid stages missles ... if liquid stage maintence is not a issue then why they have changed to soild fuels

the development of solid fuel stated in 1966 after Minuteman-I and solid fuel missle of russia is SS-13 Savag but due to technical problems russia took many years to come out with ss-24 in 1987
untill that to maintain proper balance they need to have missiles (let it be liquid or solid)icbms

their is effective way of using liqiud propellant missiles i.e :to monitor them regularly and refill liqiud oxygen when required....due this and some other reasons liquid propellants are less preferred then solid in case of weapon systems

 

[plugwater]

well yes statergic missiles are operational and ready to go ...we cant say that they are not refuled at regular intervels
and if u follow the icbm development of russia the last icbm with liquid propellant is ss-19 after that from 1987 all the missiles they developed are solid fuel let it be ss-24,ss-25,ss27,rs29 all these are three solid stages missles ... if liquid stage maintence is not a issue then why they have changed to soild fuels

the development of solid fuel stated in 1966 after Minuteman-I and solid fuel missle of russia is SS-13 Savag but due to technical problems russia took many years to come out with ss-24 in 1987
untill that to maintain proper balance they need to have missiles (let it be liquid or solid)icbms

their is effective way of using liqiud propellant missiles i.e :to monitor them regularly and refill liqiud oxygen when required

There are three types of rocket propellant Petroleum, Cryogenic ,Hypergolic. Cryogenic is the one you are talking about, it need constant monitoring, refueling and also very low temperature. But the propellant used in SS-19 stilletto is Unsymmetrical dimethyl hydrazine (UDMH) which is a Hypergolic propellant. Hypergolic propellant needs lless monitoring and the missile can be kept without refueling for a very long time.

The SS-19 Stiletto ICBM is the smallest of the 10,000 km range ICBM's. It has only 3 minute reaction time from key turn to lift off and considered as a huge accomplishment for using liquid propellant. To achieve low reaction time the vehicle stays fueled throughout its service. This was achieved by encapsulation of the missile in a container in which this missile stayed from production until launch.

Regarding the latest missiles being solid propellant is true but the replacement of SS-18 Satan ICBM will be a Liquid propellant ICBM. So we cant say all liquid propellant missiles are being replaced by solid propellant.

 

[EagleOne]

There are three types of rocket propellant Petroleum, Cryogenic ,Hypergolic. Cryogenic is the one you are talking about, it need constant monitoring, refueling and also very low temperature. But the propellant used in SS-19 stilletto is Unsymmetrical dimethyl hydrazine (UDMH) which is a Hypergolic propellant. Hypergolic propellant needs lless monitoring and the missile can be kept without refueling for a very long time.

The SS-19 Stiletto ICBM is the smallest of the 10,000 km range ICBM's. It has only 3 minute reaction time from key turn to lift off and considered as a huge accomplishment for using liquid propellant. To achieve low reaction time the vehicle stays fueled throughout its service. This was achieved by encapsulation of the missile in a container in which this missile stayed from production until launch.

Regarding the latest missiles being solid propellant is true but the replacement of SS-18 Satan ICBM will be a Liquid propellant ICBM. So we cant say all liquid propellant missiles are being replaced by solid propellant.

well if u know the difference then ok
u see UDMH will use dinitrogen tetroxide (nto) for combustion and the properties of nitrogen tetroxide
are highly corrosive and toxic .
u need to look at the case of R-16 missile of russia ..after that they developed sophisticated technology for holding this kind of fuel but the problem redused significantly but cannot be avoidable.
that the another reason for replacing these liquid stage propellant

 

[plugwater]

I don't see any problem with toxic. Missile are always sensitive so you need to extra careful when handling it. In case of corrosive each SS-19 missile have a lifespan of 10 yrs which is a very reasonable time.

Mate all liquid propellant missile are not being replaced by solid propellant, R-36(Liquid propellant) will be replaced by another ICBM which is liquid propellant only.

 

[EagleOne]

I don't see any problem with toxic. Missile are always sensitive so you need to extra careful when handling it. In case of corrosive each SS-19 missile have a lifespan of 10 yrs which is a very reasonable time.
Mate all liquid propellant missile are not being replaced by solid propellant, R-36(Liquid propellant) will be replaced by another ICBM which is liquid propellant only.

10 years is reasonable but compared to the same range of solid fuel it is higher ,....but in case of Russia they are still present .and if all liquid propellants are replaced by another liquid propellant system then it need to be advanced and over come the difficulties of corrison etc of previous versions
well ss-19 may be replaced by liquid propelling icbm in future but we need to wait untill we get some more details of the system.

US completely replaced liquid propelled with solid and china replacing their inventory .

 

[EagleOne]

see this link
MissileThreat :: New RS-24 Missiles to Replace Older Russian Systems
Russia says destroyed 9 ICBMs in 2009 under START 1 arms pact | Russia | RIA Novosti

they are bit confusing

 

[plugwater]

see this link
MissileThreat :: New RS-24 Missiles to Replace Older Russian Systems
Russia says destroyed 9 ICBMs in 2009 under START 1 arms pact | Russia | RIA Novosti

they are bit confusing

I think the news about the liquid propellant missile is the latest so they may have changed the decision.

 

[A chauhan]

I have read somewhere that Pak Fa will have a Radar with 350km+ range ! how credible it is?

 

[EagleOne]

Irbis-E- PESA -can detect 30 airborne targets at one time at ranges near 400 kilometers-it is used in su-35 so it may be definetly more...

 

[plugwater]

I have read somewhere that Pak Fa will have a Radar with 350km+ range ! how credible it is?

Pak Fa will have five radars. 3 X-band AESA radars one in nose and other two on the sides and 2 L-band radars in the wings. Main X-band AESA Radar will have a range of more than 400 kms.

 

[black eagle]

can anyone tell me did india actually ink the contract to purchase the Spyder system with israel? because wikipedia says this......

India has planned the acquisition of 18 systems at a cost of $415 Million (Rs. 1800 crore) for its air force, but the deal is to be reviewed by the Central Vigilance Commission, the government's anti-corruption agency.[2] The deal was cleared by the Defence Acquisition Council in August, 2009.[3]

 

[plugwater]

can anyone tell me did india actually ink the contract to purchase the Spyder system with israel? because wikipedia says this......

The Indian ministry of defence has confirmed that it has signed a contract with M/s Rafael, Israel for the supply of the SPYDER (Surface-to-air Python and Derby) low level quick reaction missile system (LLQRM) for the Indian Air Force.

Rafael to supply SPYDER SAM systems to Indian Air Force | India Defence
http://www.aviationweek.com/aw/blog...79a7Post:04f35fb5-767a-4ca5-8c4f-450c13dc0bbd

............................

 

[sadaiv agrasar]

it has been under discussions that QRs are under development for Small Arms Fire Detection System, any member would like to shed some light on this?