chetak wrote:There are no special specs given by the IAF for the crash worthiness of the Dhruv. Why would any Indian designed helo be more crash worthy than required? Do we crash more often?
There is essentially no airframe difference between the civilian and military versions of the Dhruv except for the wheels fitted on the civilian ( and also Navy & Coast Guard ) version and the skid fitted on the Army and Air Force versions. Other differences are engines and the equipment suite.
No what I meant is that the civilan Dhruv is a military derviative and has the same crash worthiness as the military one. Normal civilian versions wouldnt have that kind of extra crash worthiness (the military ones are expected to be in combat and get shot at and you might have to land one in a real hurry!) as the military ones because that would cut fuel and payload efficiency. Enter composites in a big way in Dhruv .
But that said, I knew during the design stage that extra care was paid to crash worthiness that was built into the designs. Back in those days there were big whines when the skids were selected for army version becuase the whiners said that only wheels alone will make it crash worthy !.
Composites notwithstanding, the Navy baulked at accepting the Dhruv because primarily it was very much heavier than promised and having a short range bird at sea is a big time liability. This translates to less loiter and weapon carrying capacity. This also puts the ship at great risk because she will have to stay exposed longer in submarine infested waters.
The Dhruv is not suitaeble as a ship borne helicopter which is esentially multi role . Period.It needs to do ASW, ASwW and SAR and have large endurance and range as well. You need a 10 ton helicopter to be able to do that. With even just a LWT or a Anti ship missile laoded it will have serious range and loiter restrictions. As for SAR roles, again, there will be restrictions on range and no of people it can pick up at a give time.
The more important part is I think the Dhruv wouldnt have certain key requirements that are really really necesary for a true Navl Helicopter like the Sea King . Stuff like auto fold of rotors, auto hover all these are absolutely crucial. I dont think Dhruv had these features. A
As for vibration, I think that was a fallout of the US sanctions. Remember, the original powerplant for the Dhrvu was the LHTEC CTS 800 i think with close to 1800 shp. The Dhruv in fact was nearly fully certified with athat engine and the trubomeca was adopted only after the sanctions. Why Turbomeca did not have an equivalent engine.. Hence the Shakti. That crusial Lorid's Anti Resonance Isolation system too fell a victim of that. I dont know what happened to address that , but I think there must have been something done. If anyone knows , please update