+53
AMCXXL
Kiko
lancelot
The-thing-next-door
Cyberspec
jaguar_br
Singular_Transform
RTN
marcellogo
owais.usmani
miketheterrible
Isos
Arrow
kvs
archangelski
SeigSoloyvov
ult
dino00
Tsavo Lion
Hole
magnumcromagnon
Stealthflanker
GunshipDemocracy
mnztr
LMFS
hoom
PapaDragon
Svyatoslavich
T-47
ATLASCUB
franco
AlfaT8
Odin of Ossetia
Firebird
JohninMK
Honesroc
ExBeobachter1987
Vann7
nemrod
zepia
flamming_python
collegeboy16
d_taddei2
Viktor
Big_Gazza
TR1
George1
Hoof
Austin
GarryB
USAF
Russian Patriot
Sukhoi37_Terminator
57 posters
Tu-95MS "Bear"
LMFS- Posts : 5183
Points : 5179
Join date : 2018-03-03
- Post n°76
Re: Tu-95MS "Bear"
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
JohninMK- Posts : 15716
Points : 15857
Join date : 2015-06-16
Location : England
- Post n°77
Re: Tu-95MS "Bear"
I would say, especially the propeller.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
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.
Tsavo Lion- Posts : 5954
Points : 5906
Join date : 2016-08-15
Location : AZ, USA
- Post n°78
Re: Tu-95MS "Bear"
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?
LMFS- Posts : 5183
Points : 5179
Join date : 2018-03-03
- Post n°79
Re: Tu-95MS "Bear"
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 inceptionJohninMK wrote:I would say, especially the propeller.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
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.
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°80
Re: Tu-95MS "Bear"
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.
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.
GarryB- Posts : 40685
Points : 41187
Join date : 2010-03-30
Location : New Zealand
- Post n°81
Re: Tu-95MS "Bear"
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.
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.
Tsavo Lion- Posts : 5954
Points : 5906
Join date : 2016-08-15
Location : AZ, USA
- Post n°82
Re: Tu-95MS "Bear"
Although slower, officially, its
The VVS didn't bother updating it with relevant world aviation bodies!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
mnztr- Posts : 2922
Points : 2960
Join date : 2018-01-21
- Post n°83
Re: Tu-95MS "Bear"
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.
d_taddei2- Posts : 3029
Points : 3203
Join date : 2013-05-11
Location : Scotland Alba
- Post n°84
Re: Tu-95MS "Bear"
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.
https://www.russiadefence.net/t3372-my-pics-and-vids
https://www.russiadefence.net/t3372-my-pics-and-vids
George1- Posts : 18540
Points : 19045
Join date : 2011-12-22
Location : Greece
- Post n°85
Re: Tu-95MS "Bear"
Beriev supplied another upgraded Tu-95MS aircraft with the onboard number "54" for the Russian long-range strategic aviation.
https://kot-or-osl.livejournal.com/2229138.html
https://kot-or-osl.livejournal.com/2229138.html
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°86
Re: Tu-95MS "Bear"
What is this heresy!
A painted Tu-95
A painted Tu-95
GunshipDemocracy- Posts : 6174
Points : 6194
Join date : 2015-05-17
Location : fishin on Stalin´s Strait between Mexico and Canada
- Post n°87
Re: Tu-95MS "Bear"
hoom wrote:What is this heresy!
A painted Tu-95
its a stealth paint
Hole- Posts : 11159
Points : 11137
Join date : 2018-03-24
Age : 48
Location : Scholzistan
- Post n°88
Re: Tu-95MS "Bear"
This is not the first to be painted.
Tsavo Lion- Posts : 5954
Points : 5906
Join date : 2016-08-15
Location : AZ, USA
- Post n°89
Re: Tu-95MS "Bear"
Tu-95MS to the retaliatory strike is ready
"Major repairs and modernization'll allow the "Bear" to fly until the mid. XXI century"
"Major repairs and modernization'll allow the "Bear" to fly until the mid. XXI century"
mnztr- Posts : 2922
Points : 2960
Join date : 2018-01-21
- Post n°90
Re: Tu-95MS "Bear"
Tsavo Lion wrote:Tu-95MS to the retaliatory strike is ready
"Major repairs and modernization'll allow the "Bear" to fly until the mid. XXI century"
Are those the upgraded engines? I was hoping for more advanced props like a propfan
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°91
Re: Tu-95MS "Bear"
Thats just the same pic as above of recently completed upgrade to current standard.
Prototype of the new standard is said to be due for first flight late 2019 so I think we're fairly unlikely to see it till then.
On the other hand presumably they'll need to flight-test the new engine/props on an existing airframe first so we might see that before?
As much as I'd love to see big An-70 style raked scythe blades
They seem to have gone for a relatively conservative type on new TV7-117 for Il-112
though the ones they used for flying tests has raked leading edge, flat back
Prototype of the new standard is said to be due for first flight late 2019 so I think we're fairly unlikely to see it till then.
On the other hand presumably they'll need to flight-test the new engine/props on an existing airframe first so we might see that before?
As much as I'd love to see big An-70 style raked scythe blades
They seem to have gone for a relatively conservative type on new TV7-117 for Il-112
though the ones they used for flying tests has raked leading edge, flat back
mnztr- Posts : 2922
Points : 2960
Join date : 2018-01-21
- Post n°92
Re: Tu-95MS "Bear"
I assume they will be using a counter rotating prop? If not even with 6 blades the prop radius will be HUGE. I really hope they seek to break new ground in prop fans with this engine. The incredible power of this engine is still unbeaten in the turbo prop world and I think it has HUGE potential for future airliners engines. Maybe they will go with 4 rows or maybe counterrotating 6 blade to keep the tips subsonic.
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°93
Re: Tu-95MS "Bear"
So I did a bit of digging about Aerosila they named as supplier of new Tu-95 props
Turns out they're the continuation of the main Soviet propeller developer/manufacturer since i-15 in the late '30s including the props for Tu-95, An-70 & Il-112/114. (as well as various other related products)
Mostly seems to have been working on APUs recently though
But apparently are equipped with modern digital design/manufacturing gear & those Il-112/114 props do give some recent experience.
Interestingly the Technical page for SV-27 (raked scythe blades for An-70, btw its 8 blades front, 6 blades rear)
http://aerosila.ru/en/products/vozdushnye-vinty-ivintoventilyatory-dlya-samoletov/vintoventilyatory-klass-tyagi-10000-kgs
says its designed for 11,000hp, but the History page says 'later' 14,000hp.
Still short of the quoted 15,000hp for new Tu-95 engine but pretty close so it may indeed be the case that the new prop is a variant of the An-70 prop
Turns out they're the continuation of the main Soviet propeller developer/manufacturer since i-15 in the late '30s including the props for Tu-95, An-70 & Il-112/114. (as well as various other related products)
Mostly seems to have been working on APUs recently though
But apparently are equipped with modern digital design/manufacturing gear & those Il-112/114 props do give some recent experience.
Interestingly the Technical page for SV-27 (raked scythe blades for An-70, btw its 8 blades front, 6 blades rear)
http://aerosila.ru/en/products/vozdushnye-vinty-ivintoventilyatory-dlya-samoletov/vintoventilyatory-klass-tyagi-10000-kgs
says its designed for 11,000hp, but the History page says 'later' 14,000hp.
Still short of the quoted 15,000hp for new Tu-95 engine but pretty close so it may indeed be the case that the new prop is a variant of the An-70 prop
Hole- Posts : 11159
Points : 11137
Join date : 2018-03-24
Age : 48
Location : Scholzistan
- Post n°94
Re: Tu-95MS "Bear"
The new propellers are called AV-60T. They are a refined version of the currently used props.
mnztr- Posts : 2922
Points : 2960
Join date : 2018-01-21
- Post n°95
Re: Tu-95MS "Bear"
Hole wrote:The new propellers are called AV-60T. They are a refined version of the currently used props.
Hmm that does not sound like more then an incremental step. I was really hoping they would go with counter rotating 6 bladed schimitar fans....
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°96
Re: Tu-95MS "Bear"
Well thats much less fun
I guess my first instinct of minimal change was right.
I guess my first instinct of minimal change was right.
GunshipDemocracy- Posts : 6174
Points : 6194
Join date : 2015-05-17
Location : fishin on Stalin´s Strait between Mexico and Canada
- Post n°97
Re: Tu-95MS "Bear"
hoom wrote:Well thats much less fun
I guess my first instinct of minimal change was right.
and what is wrong with incremental steps? Su30SM is an incremental step form Su-27 too
hoom- Posts : 2352
Points : 2340
Join date : 2016-05-06
- Post n°98
Re: Tu-95MS "Bear"
Because as well as looking amazingly cool there is a big efficiency/noise difference between the raked scythe style props & the conventional blade style of the original props.
GarryB- Posts : 40685
Points : 41187
Join date : 2010-03-30
Location : New Zealand
- Post n°99
Re: Tu-95MS "Bear"
But clearly not enough to warrant a change...
GunshipDemocracy- Posts : 6174
Points : 6194
Join date : 2015-05-17
Location : fishin on Stalin´s Strait between Mexico and Canada
- Post n°100
Re: Tu-95MS "Bear"
hoom wrote:Because as well as looking amazingly cool there is a big efficiency/noise difference between the raked scythe style props & the conventional blade style of the original props.
But new scythe are those updated ones?