Two engine karrar with two turbojets
Rumors
Any source?
Interesting question. I think we can get close to an answear if we think about this by our own.
lets asume that there is a twin engine karrar. So how would the tecnical datas change? what kind of modifications would be needed and which problems and solutions would accure?
General data of karrar:
Combat Range: 1000 km
Empty Weight: 450 kg
Max Weight: 700 kg
Max Payload: 227 kg
Engine: Toloe 4
Thrust 3,7 KN
Engine Weight: 54,7 kg (par of Empty weight)
Hoch much fuel does Karrar need for these specifications?
Fuel = Max weight - (MaxPayload + EmptyWeight) => 700kg - (450+227) = 700 - 677 =
23kg Fuel
That means that Karrar needs 23 kg Fuel with a single toloe 4 Engine for a general range up to 1000 km or a combat range of 500 km.
If we add another toloe 4 Engine and want to keep the specifications, we need the same amount of fuel. That means
Added weight = EngineWeight + FuelWeight = 54,7kg + 23kg = 77,7 kg Additional weight.
If we take into account that the engine will double the thrust wich means that the Max possible Weight will also be doubles (dont consider the additional drag), we will have a max weight of 1400 kg inseat of 700 kg. The weight of the body + two engines and double fuel will be alltogether = 784,7 kg. So the new specifications will
be round about: 600kg Payload instead of 227 kg.
Iran can also double or triple the range. Karrar will have
46 kg Fuel for 1000 km range. 2000 km range will need round about 100 kg fuel. That means 550 kg payload and 2000 km range.
Constructive Changes inside in the karrar:
The fuel tank will also increase its size because it have to hold not 23 kg of fuel anymore but 100 kg or 50 kg according to configuration.
Lets take a look if there are any bigger changes has to be made or if its possible to put the fuel tank in the already existing frame:
1kg jetFuel = 0,8Liter
23kgjetFuel = 18,4 liter = 18.400 cm^3 => 3rd squrt out of that and we get Tank sidelenght if tank is square:
26 cm
50kg JetFuel = 40 Liter = 40.000 cm^3 => 3rd squrt out of that and we get Tank sidelenght if tank is square:
34 cm
100kgJ etFuel = 80 Liter = 80.000 cm^3 => 3rd squrt out of that and we get Tank sidelenght if tank is square:
43 cm
Okay honestly a Tank maybe be barrel or Sphere Shaped and not square shaped. But this reference should give us only an overview about the evolution of the dimensions.
Cause there are many other subsystems inside the karrar drone and many other subsystems may have to be also doubled, for example Oil System, Fuel pumps and redunancy systems, i believe that the whole frame of the karrar will also increase. That means that the lenght or the thickness of the body will maybe increase.
This will lower the whole payload weight, increase the overall drag again and higher the fuel consumption. Taking all these facts into consideration
I expect general payload of 500 kg for realistic instead of the 600kg mentioned before.
The question is: What optioins do we have with 500kg payload?
Air Defence support with 1000 km range version:
Yes It is generally possible to mount Fakour 90 Air defence Missiles on that drone and fire them from karrar, guided with radars from other aircraft or radars on the ground.
It is also possible to mount modern Jet Aircraft radars on that drone (100 - 150 kg ) with Azarakhsh or Fatter Air-Air missiles. If Infrared Missiles are used, radar is not needed and the drone can carry between 6 - 8 Air to Air missiles and Support the Air defence specially against other drone.
The Karrar is very good to use for an Air defense drones, specially against other drones because it is fast, high payload, mobile and cheap to produce.
Drones are a big problem for any air defence. Iran shot the Heron drone with a big S-200 Missile. Of course there are also valuable drones like the Global Hawk. But most drones are not valuable or costly. For example, if an enemy owns 200 Bayaktir drones and several hunderet cheaper drones with the possibility to replace them if shoot down, the defending country can not always use its S-300 or Bavar 313 or even Tabas Systems and so on. Other option is to use large and costly fighter aircraft. Another Option are CIWS. problem with CIWS is that they are not able to take the initiative in this game. They wait for enemy drones until they come and react on their actions. But first: It is simply not possible to protect every single assed in a country with sophisticated air defence.
So a twin engine Air defence Karrar drone with 500 - 600 kg payload will enable Iran to be in the initiative in any drone war.
The Karrar drone is almost the only drone wich is able to do the job fast and with big amount of missiles on board.
One single karrar can potentially destroy 6 enemy drones. 12 Karrars needed to fight more than 60 enemy drone swarms.