HAL Indian Multirole Helicopter (IMRH)

500 KM !? Sea Level Range !?

What are the Army Requirements...!?

 

From PKS:

1) Actually, the HTSE-1200 is being developed for a slightly stretched version of the ALH that will see the ALH morphe from the existing 5.5-tonne MRH to a 7.5-tonne MRH. In fact, you may recall that back in 2005 HAL, CSIR & a few DRDO labs were trying to develop a fly-by-light flight-control system & it was all to do with this envisaged 7.5-tonne MRH version of the ALH that will have greater internal volume as well as more internal fuel for increased flight endurance

@Agent_47 remember we had discussed this









A "stretched" ALH design in the 7.5-9 ton range would be an excellent addition to HAL's portfolio.



Incidentally, Boeing are pitching the AW139 (MH-139) to the USAF to replace their UH-1N.



There are >900 AW139s in service (or on order) around the world, there is a HUGE market for this class of helo.

@Gessler @PARIKRAMA @Hellfire @MilSpec @nair @randomradio @GuardianRED @ni8mare @Echo_419 @Grevion @Ankit Kumar 001

 

Do like this concept

BUT , keeping our needs first ! Does the Indian Armed forces have a requirement for 7.5ton MRH?? and do we have an existing 7.5ton frame already in use?

 

Currently there isn't any overt sign the armed forces are looking for a 7.5-9 ton helo but as they say build it and they will come, I'm sure when/if this is developed there will be sufficent interest from multiple services, for many roles it is more suited than far the IMRH (a heavy medium class helo). And the new design will fit nicely within HAL's portfolio otherwise there would be quite the jump from the 5.5t ALH to the 12-13t IMRH, quite the glaring gap.

To be honest, I think the 7.5-9t "stretched" ALH makes more sense for, say, the IA than the current

True bro and in fact HAL may embark on this new project just to keep their, now, highly capalble development team occupied. HAL seem very concious these days of keeping their capacity (whether that be on the production or the development side) fully utilised.

In not very long the R&D efforts of the LUH and LCH will largely be maxed out and only iterative development would need to go on (as in ALH MK.1-4) but that requires far less resources and focus so there will be capacity becoming freed as a result and the IMRH is the only new project HAL's rotary development wing has proposed.

5.5t ALH in the transport role. The ALH always struck me as a bit of an outlier, it doesn't really fit anywhere- it is not a light helo as its designation would suggest, nor is it a medium class helo really either. It can't be used for the RSH roles of the LUH nor does it have the range/endurance of a true medium class helo to be used in maritime/shore based roles such as SAR or interdiction. The "stretched" ALH design would address all of these issues.

For this reason, I think a "stretched" ALH design could have enourmous potential for the ICG and IN (to a lesser extent as they hand over more domestic roles to the ICG) backing up heavier helos like the H225M/EC-725

True true, but it does make me wonder about the IMRH, based on the HTSE-1200's power ratings it will be insufficent for the IMRH in a twin engine configuration. Unless HAL are willing to go the AW-101 route and have three engines, they will need to look to a more powerful engine for the IMRH.

Really, the "stretched" 7.5-9t ALH will be a walk in the park compared to the IMRH, it will be almost identical to existing designs and will even use their own in-house engine. The IMRH is a different beast all together and quite a leap for them.

True bro and in fact HAL may embark on this new project just to keep their, now, highly capalble development team occupied. HAL seem very concious these days of keeping their capacity (whether that be on the production or the development side) fully utilised.

In not very long the R&D efforts of the LUH and LCH will largely be maxed out and only iterative development would need to go on (as in ALH MK.1-4) but that requires far less resources and focus so there will be capacity becoming freed as a result and the IMRH is the only new project HAL's rotary development wing has proposed.

 

Recent Hal Tender for IMRH

 

It looks like a Puma and Mi-17 "did the do" and that was the product of their unholy love. Pretty conventional design, should help from a risk perspective, but meh, it's otherwise unremarkable. So long as it works who really care though, right?

 

Sorry guys, but don't try to see similarities with other helicopters, when the answer is right in front of you:




The design of the cockpit section is not only similar, it even has identical layout and number of windows.



Both obviously share also the gear and sponson layouts and even the high tail and tail boom is a common design feature for HAL (Dhruv, LUH, LCH). So they took the smart way and enlarged the Dhruv design with a re-designed mid section. The twin air intakes btw is a common design for different helicopters, not only for the Puma, but for Mi 8 / 17 / 26, Kamov versions, so it's obvious where this feature came from.

 

HAL floats RFI for turboshaft, transmission and technical consultancy on rotors for the Indian Multi-Role Helicopter (IMRH) Programme.

HAL's Rotary Wing Research and Design Centre division on the 10th of May floated RFIs for Turboshaft engine, transmission and technical consultancy of the rotor for the Indian Multi-Role Helicopter. The Turboshaft requirements are for a 250kg engine with Full Authority Digital Engine Control (FADEC) which can operate in -40* C to 55* C and in 95% relative humidity. Specific fuel consumption of the engine is expected to be in the range of 0.250kg/kwhr to 0.275kg/kwhr at TOP.

The engine should provide max continuous power ratings (MCP) of 1650, 1250, 1060, 900 and 830 KW at sea level, 3000m, 4500m, 6000m and 6500m respectively. The take-off power rating (TOP) of 1950, 1450, 1250, 1050 and 975KW at sea-level, 3000m, 4500m, 6000m and 6500m respectively should be available for a minimum of 5 minutes, feasibility of 30 minutes ToP is also to be provided by the OEM. The engine should be able to start in temperatures of -40* C to 55* C and pressure altitude of -500m to 6000m. The engine must be capable of air starts (relight in air) up to an altitude of 5.5 km.

The Transmission system Main Gear Box (MGB) should take up around 22000 to 24000 RPM from engine and reduce to around 205 to 240 RPM at Rotor Axis. It should also have potential to take Power of around 2X2000 kW to meet it's operational requirement. Tail Gearbox (TGB) should have potential to take up around 400 to 500 kW power at a speed of around 1050 to 1300 RPM.

 

Cough....cough...



http://indiandefence.com/threads/hal-indian-multirole-helicopter-imrh.57844/page-2#post-524606


http://indiandefence.com/threads/hal-indian-multirole-helicopter-imrh.57844/page-2#post-524615

 

RFI for Landing Gear System and Rotor Blade Folding System was also out too.