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    Tu-160 and Tu-95MS ( Blackjack and Bears )

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    JohninMK

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  JohninMK on Thu Aug 23, 2018 9:57 pm

    LMFS wrote:So, it not only the engine but also the propeller. There has been lots of advance in that regard since the design of the Tu-95
    I would say, especially the propeller.

    Regardless of the application, propellers/fans have changed enormously over the past 20 years let alone 50 years. Just look at the humble cooling fan in your PC or car engine, let alone the prop on a C-130J or A-400M, or even a submarine.

    Its the computer power now in CAD directly influencing power efficiency from an engine.
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    Tsavo Lion

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  Tsavo Lion on Thu Aug 23, 2018 10:09 pm

    I wonder, could pilots feather 1-2 engines in flight to save fuel & extend the range even more, like the USN P-3s do on long patrols?
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    LMFS

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  LMFS on Thu Aug 23, 2018 11:48 pm

    JohninMK wrote:
    LMFS wrote:So, it not only the engine but also the propeller. There has been lots of advance in that regard since the design of the Tu-95
    I would say, especially the propeller.

    Regardless of the application, propellers/fans have changed enormously over the past 20 years let alone 50 years. Just look at the humble cooling fan in your PC or car engine, let alone the prop on a C-130J or A-400M, or even a submarine.

    Its the computer power now in CAD directly influencing power efficiency from an engine.
    If they prevent the tips from being supersonic they will reduce noise many times over, this is probably the reason for the noise reduction mentioned in the article. Probably this has an effect in efficiency too, though I can't quantify it. There was development with UDF engines and similar propeller solutions for high subsonic airliners with extreme degrees of fuel efficiency, it would be funny now to see the Tu-95 as the most fuel-economical bomber 60 years after its inception Very Happy

    hoom

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  hoom on Sat Aug 25, 2018 2:20 pm

    Wow new props too!
    Smaller diameter/bigger area/more blades to get same drive from lower RPM & therefore bring tip speed subsonic?!
    Contra-rotating is still going to be noisy though.
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    GarryB

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  GarryB on Sun Aug 26, 2018 5:52 am

    Actually the Bear is no where near as noisy and some other aircraft... the Harvard for one...

    The speed of the blades on the Bear are much slower than suspected in the west and generate more thrust with a coarser pitch for normal flight.

    Coaxial design increases the number of blades and further increases thrust without increasing blade length.

    The Bear is still the worlds fastest propeller driven aircraft... and the only propeller driven aircraft that requires a swept wing.
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    Tsavo Lion

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  Tsavo Lion on Sun Aug 26, 2018 6:43 am

    Although slower, officially, its
    The Tupolev Tu-114, a large aircraft with four turboprop engines, has a maximum speed of 878 km/h (540 mph, Mach 0.73). The 11,000 kW (15,000 hp) Kuznetsov NK-12 turboprop engines designed for the Tupolev Tu-95 (and used to power the derivative Tu-114) are the most powerful turboprops ever built and drive large contra-rotating propellers. This engine-propeller combination gives the Tu-114 the official distinction of being the fastest propeller-driven aircraft in the world, a record it has held since 1960.
    https://en.wikipedia.org/wiki/Fastest_propeller-driven_aircraft#Turboprops
    The VVS didn't bother updating it with relevant world aviation bodies!

    mnztr

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  mnztr on Tue Aug 28, 2018 5:37 pm

    Does anyone have any detailed info on the new engines on the Bear, I am going to MAKS next year and look forward to seeing all the amazing Russian planes for the first time. The Bear still looks very futureistic in a steampunk kinda way. With schimitar props on this beast, who knows what it could do. I bet engine and prop updates can easily gain 20% in range.
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    d_taddei2

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  d_taddei2 on Tue Aug 28, 2018 9:52 pm

    I have pics of Tu-95 and Tu-22m including one of me standing next to the blades of a Tu-95 gives you and idea of the size. Can be found along with other pics here on this forum if anyone is interested.

    http://www.russiadefence.net/t3372-my-pics-and-vids
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    Tsavo Lion

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    Re: Tu-160 and Tu-95MS ( Blackjack and Bears )

    Post  Tsavo Lion on Tue Sep 11, 2018 4:20 am

    Some good info. & pics here too:
    https://lenta.ru/articles/2018/01/30/blackjack/

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