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    Promising high-speed helicopter (PSV)

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    Hole

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    Re: Promising high-speed helicopter (PSV)

    Post  Hole on Thu May 31, 2018 5:12 pm

    High-speed projects from Kamow:




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    LMFS

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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Thu May 31, 2018 6:22 pm

    Hole wrote:High-speed projects from Kamow:

    The Ka-90 is a cool science-fiction concept but I think the lower pic of the transport helicopter has a rear propeller and a rigid rotor doesn't it? That would be pretty much that... For Kamov it should be easier than anyone to modify the coaxial rotor for a fast helicopter concept since they have decades experience operating them. The Ka-52's fuselage would be reusable to a high extent Cool

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    Re: Promising high-speed helicopter (PSV)

    Post  Hole on Thu May 31, 2018 9:55 pm

    There is a military version of the PSV called PSSTDV = future high-speed medium transport and assault helicopter. Like a Mi-24/-35 on steroids.
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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Fri Jun 01, 2018 12:18 am

    Hole wrote:There is a military version of the PSV called PSSTDV = future high-speed medium transport and assault helicopter. Like a Mi-24/-35 on steroids.
    Do you casually have links???
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    Cheetah

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    Re: Promising high-speed helicopter (PSV)

    Post  Cheetah on Fri Jun 01, 2018 2:43 am

    LMFS wrote:Do you casually have links???

    It is mentioned in this PDF i found after a quick search.

    https://vtol.org/files/dmfile/RussiaChinaOmelchenko1.pdf

    Meantime, it was clarified at MAKS that the Ministry of Defence is backing the research of the military high-speed rotorcraft. The Commander-in-Chief of the Russian Aerospace Forces, Colonel General Viktor Bondarev, stated that the program is proceeding “full speed ahead.” Two high-speed programs are being funded: the UVK attack helicopter (Udarny Vertolyotny Kompleks – Strike Helicopter System) and medium-sized PSSTDV transport (Perspektivny Sredny Skorostnoy Transportno-Desantny Vertolyot – Advanced High-Speed Medium Utility Helicopter), the latter reportedly based on the PSKV civil design.
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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Fri Jun 01, 2018 2:02 pm

    Cheetah wrote:
    LMFS wrote:Do you casually have links???

    It is mentioned in this PDF i found after a quick search.

    https://vtol.org/files/dmfile/RussiaChinaOmelchenko1.pdf

    Meantime, it was clarified at MAKS that the Ministry of Defence is backing the research of the military high-speed rotorcraft. The Commander-in-Chief of the Russian Aerospace Forces, Colonel General Viktor Bondarev, stated that the program is proceeding “full speed ahead.” Two high-speed programs are being funded: the UVK attack helicopter (Udarny Vertolyotny Kompleks – Strike Helicopter System) and medium-sized PSSTDV transport (Perspektivny Sredny Skorostnoy Transportno-Desantny Vertolyot – Advanced High-Speed Medium Utility Helicopter), the latter reportedly based on the PSKV civil design.
    Very interesting Cheetah, many thanks

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    Re: Promising high-speed helicopter (PSV)

    Post  hoom on Fri Jun 01, 2018 4:49 pm

    Is it only me or the Alligator has prime conditions to be turned into a high speed helicopter with relative ease? Compare the render below with Sikorky's twin rotor + propeller proposals:
    I think you're right yes.

    I'd not thought of directly reworking Ka-52 airframe like that but those renders show its a pretty viable concept Cool
    It's the sort of thing I'd have expected to have seen rather than that barely reworked Mi-24 demonstrator though.

    Would need a bit more effort than just sticking props on the back though: you need engines & drive shaft to power the prop/s also and harder from my understanding you need to have more rigid hub & rotors for the higher speeds (presumably the key work thats been done with the Mi-24 demonstrator)


    Last edited by hoom on Fri Jun 01, 2018 8:00 pm; edited 1 time in total
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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Fri Jun 01, 2018 5:11 pm

    So, researching a bit...

    It seems Kamov and Mil are competing for the attack (UVK) and transport (PSSTDV) versions of the high speed military helicopter, so in essence quite similar to US efforts. Apparently prototypes were expected to fly this year but the lack of new would indicate the project is progressing slower as planed.

    Below models of the Ka-92 and Mi-X1.



    The advanced blade developed with TsAGI apparently can be retrofitted in existing helicopters and provide a 10% increase in speed.

    Due to matters like retreating blade and main rotor torque, I think the Kamov approach is more promising. The following would make sense to me, at least technically:

    > Advanced blades in the existing Mil models as short term improvement
    > Rigid rotor + propeller technology for Kamov as mid and long term solution, with speeds above 500 km/h and big ranges (>1400 km expected for the Ka-92)
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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Fri Jun 01, 2018 7:03 pm

    hoom wrote:I think you're right yes.

    I'd not thought of directly reworking Ka-52 airframe like that but those renders show its a pretty viable concept Cool
    It's the sort of thing I'd have expected to have seen rather than that barely reworked Mi-24 demonstrator though.
    The Ka-50 (V-80) was designed as a high speed helicopter originally, therefore the fuselage is very aerodynamic already:



    They were already on those early days thinking about 500-600 km/h and very advanced concepts to improve its agility:

    https://www.aex.ru/docs/1/2014/9/16/2118/

    Like said above there is one improvement related to the rotor blades that allows a marginally faster conventional helicopter. This would make sense to improve exiting fleet or models in production (like you refer for the Mi-24) but it clearly falls short of getting all the benefits of a more advanced concept, especially in Russia this is relevant due to the geography. And with US making progress in this area they cannot allow themselves to fall far behind either.

    hoom wrote:Would need a bit more effort than just sticking props on the back though: you need engines & drive shaft to power the prop/s also and harder from my understanding you need to have more rigid rotor hub & rotors for the higher speeds (presumably the key work thats been done with the Mi-24 demonstrator)
    Agree, a very deep rework would be necessary for the horizontal propulsion and rotor. But this could be used to modernize the Ka-52, which is a rather old concept after all while many other areas of the aircraft could be kept.

    The advanced rotor developed in the Mi-24 based demonstrator is IMHO not critical for the solution with propellers, since a fast speed of the main blades is not needed to generate horizontal thrust: in a counter-rotating configuration the fact that the retreating blade does not generate lift at all is not a problem since it is compensated with the additional rotor. In fact the rotation speed of the rotor diminishes in the Sikorsky X-2 with the increasing air speed. So no design for transonic blade tip is necessary. It would be also interesting to see the aerodynamic advantages derived from improved AoA of the fuselage, as the main rotor has no role generating horizontal thrust.

    I had thought a counter-rotating propeller would allow to control the torque in the longitudinal axis, partially compensating the substitution of the original rotor with a rigid one, but thought it was mechanically complex. Interestingly the Ka-92, contrary to US prototypes, incorporates this solution.

    If they see viability in modifying the Ka-52 with these technologies they could get a system in a relative short period of time and little money, with great advantages. Imagine for instance the capacity increase of a naval version with so much more speed and range. That would be a breakthrough indeed

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    Re: Promising high-speed helicopter (PSV)

    Post  hoom on Sat Jun 02, 2018 8:50 am

    Wow  Shocked
    Reminds me of the NOTAR LHX concept I always really liked


    Below models of the Ka-92 and Mi-X1.
    First time I've seen that Mi-X1, hmm.

    I really hope that they're not really expecting Ka-90 to work, like I previously posted US has tried that concept repeatedly & not even got close to a transition, not impossible that the Russian engineers are better & successful but its unlikely.

    Mi-X1 is basically same concept as X-49 which while it seems to work, its always diverting most of the tail thrust sideways, looks hacky  & awkward (to be fair it is just a hacky SH-60 conversion but I don't see how a dedicated build wouldn't still have the same issue, the basic physics of a single rotor dictate you need a big anti-torque effort, Euro X3 concept has similar issue)

    Ka-92 looks great but also seems to be really large: 30 passengers is Chinook class, doesn't seem like a suitable base for new attack chopper or naval chopper that I'd have expected to be part of the program.
    US S-97 looks really on the money (it is small but the concept for the bigger version also looks very good)
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    Re: Promising high-speed helicopter (PSV)

    Post  Hole on Sat Jun 02, 2018 11:12 am

    The design from Amiland is how old? 40 years? Tech evolved. Better materials. It could work. Real question is the cost. Is it really worth it?

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    Re: Promising high-speed helicopter (PSV)

    Post  hoom on Sat Jun 02, 2018 12:26 pm

    Which design?
    The most recent folding blade type concept was a recent carbon composite UAV X-50A.


    X-49 & S-97 are part of the current program for new gen US choppers.
    The LHX concept is really really old & long since abandoned, pulled out of/excluded from (Army said 'conventional only') the competition for what became the cancelled Comanche. I just think thats a hell of a cool concept.
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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Sat Jun 02, 2018 2:21 pm

    hoom wrote:Wow  Shocked
    Reminds me of the NOTAR LHX concept I always really liked

    Yeah that was also a favourite of mine... looks like a "supersonic" helicopter Very Happy. With high speed requirements the new designs will look IMO closer to that.

    First time I've seen that Mi-X1, hmm.

    I really hope that they're not really expecting Ka-90 to work, like I previously posted US has tried that concept repeatedly & not even got close to a transition, not impossible that the Russian engineers are better & successful but its unlikely.

    Mi-X1 is basically same concept as X-49 which while it seems to work, its always diverting most of the tail thrust sideways, looks hacky  & awkward (to be fair it is just a hacky SH-60 conversion but I don't see how a dedicated build wouldn't still have the same issue, the basic physics of a single rotor dictate you need a big anti-torque effort, Euro X3 concept has similar issue)

    Ka-92 looks great but also seems to be really large: 30 passengers is Chinook class, doesn't seem like a suitable base for new attack chopper or naval chopper that I'd have expected to be part of the program.
    US S-97 looks really on the money (it is small but the concept for the bigger version also looks very good)

    Ka-90 and all those high-risk projects... I am not holding my breath for them. Development goes step by step, not four steps at a time. First, decouple lift from horizontal thrust. Then, see how far you can go. Maybe rotor blades grow so big and so slow that you can handle them like wings or can put a radar antenna inside and rotate them relatively slow for an AWACS helicopter... who knows??

    Mi-X1... agree, I don't see the advantage apart from more conventional design and lower profile of the main rotor. As you say it looses propulsion power and is cumbersome due to anti-torque function of the tail. And besides the retreating blade issue is not solved in such design so not cleat to me it can be as fast as the Kamov's design.

    The Ka-92 has roughly the size of the EH-101 so big but within the range of a medium-sized transport helicopter... the  project was apparently destined to civil market to link remote areas, oil platforms for instance, and was moved to the defence ministry afterwards due to funding. Due to the range, it makes sense to make the helicopter big. I expect an attack helicopter to be clearly smaller of course...
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    Re: Promising high-speed helicopter (PSV)

    Post  Hole on Sat Jun 02, 2018 4:47 pm

    hoom wrote:Which design?
    The most recent folding blade type concept was a recent carbon composite UAV X-50A.


    X-49 & S-97 are part of the current program for new gen US choppers.
    The LHX concept is really really old & long since abandoned, pulled out of/excluded from (Army said 'conventional only') the competition for what became the cancelled Comanche. I just think thats a hell of a cool concept.

    The one in your picture.


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    LMFS

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    Re: Promising high-speed helicopter (PSV)

    Post  LMFS on Sun Jun 03, 2018 3:38 pm

    For the Mi-X1 it is relevant to consider the SLES system, I was not aware of this though it is an old issue:


    The Mi-X1 is being developed for a cruise speed of 257kt and maximum speed of 280kt using an innovative main rotor design with computer control. Mil is working on a system to suppress local stalls on the retreating blade. Such high speed would be achieved by applying a technology called the Stall Local Elimination System (SLES) in the main rotor. SLES delays the stall on the retreating blade through the control of its orientation angle. According to Mil calculations, the SLES should work well at speeds of up to 400 km/h. To delay the blade stall at higher speeds, Mil suggests a combination of the SLES technology with an arrow-type shape to the blade tip. Contributing to the helicopter's speed is the potential use of a tail-mounted propeller with thrust vector control via surfaces installed in slipstream.

    https://www.globalsecurity.org/military/world/russia/mi-x1.htm

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