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Behind The Scenes Of The TU-95 Bear  
User currently offlineFlexJetOKC From United States of America, joined Feb 2011, 54 posts, RR: 0
Posted (1 year 7 months 3 weeks 4 days 1 hour ago) and read 7616 times:

What an awesome video this guy shot. I would absolutely love to fly in a Bear. Check it out and enjoy!

http://www.liveleak.com/view?i=add_1357824243

[Edited 2013-01-10 09:34:34]


Above the planet on a wing and a prayer, my grubby halo, a vapour trail in the empty air...
10 replies: All unread, jump to last
 
User currently offlinespantax From Belgium, joined Nov 2004, 323 posts, RR: 1
Reply 1, posted (1 year 7 months 3 weeks 4 days 1 hour ago) and read 7589 times:

Amazing. Thank you for sharing. Love those contra-rotating propellers.


A300.10.19.20.21.30.40,AN26,ATR42,AVR146,B717.27.37.47.57.77,B1900,C130,C212,CH47,CRJ200.700,DC9,DHC4,ERJ135.190,F27
User currently offlineJoeCanuck From Canada, joined Dec 2005, 5435 posts, RR: 30
Reply 2, posted (1 year 7 months 3 weeks 3 days 19 hours ago) and read 7343 times:

Quoting FlexJetOKC (Thread starter):

Nice find...thanks for sharing.

One thing I find interesting about those huge engines, is that the contra-rotating props spun independent of each other when they were moved on the ground.

Are they directly connected with a gearbox or do they each have their own shaft and gearbox...?



What the...?
User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12138 posts, RR: 51
Reply 3, posted (1 year 7 months 3 weeks 2 days 18 hours ago) and read 6931 times:

http://en.wikipedia.org/wiki/Kuznetsov_NK-12

User currently offlineGDB From United Kingdom, joined May 2001, 13195 posts, RR: 77
Reply 4, posted (1 year 7 months 3 weeks 1 day 9 hours ago) and read 6591 times:

A fascinating video, thanks.
Never seen one in the air, however they sent one to the static park of the RIAT in 1994. Parked it near a B-52 as well!
The TU-95 is a stark, intriguing looking aircraft, even more so if you ever get to see one close up.
It looked to me like some kind of huge metal Preying Mantis, maybe a Dragonfly, either way it looked almost organic .


User currently offlinefrancoflier From France, joined Oct 2001, 3750 posts, RR: 11
Reply 5, posted (1 year 7 months 3 weeks 1 day 7 hours ago) and read 6547 times:

Interesting. I thought those props were connected via a gearbox that made them turn in opposite direction at the same speed.

When the officer preflights, he turns both props in the same direction, meaning they're both independent and connected to 2 different turbine discs on concentric shafts.



Looks like I picked the wrong week to quit posting...
User currently offlineMrChips From Canada, joined Mar 2005, 927 posts, RR: 0
Reply 6, posted (1 year 7 months 2 weeks 4 days 21 hours ago) and read 5837 times:

Quoting francoflier (Reply 5):
Interesting. I thought those props were connected via a gearbox that made them turn in opposite direction at the same speed.

When the officer preflights, he turns both props in the same direction, meaning they're both independent and connected to 2 different turbine discs on concentric shafts.

I'm fairly certain that the NK-12 has a single output shaft, rather than concentric output shafts.

Depending on the type of gearbox used (I'm assuming it's some sort of planetary gearing), it should be possible to turn both props in the same direction by hand while having them go in opposite directions while being powered by the gas turbine.



Time...to un-pimp...ze auto!
User currently offlinetitanmiller From United States of America, joined May 2006, 90 posts, RR: 0
Reply 7, posted (1 year 7 months 2 weeks 2 days 18 hours ago) and read 5563 times:

Quoting MrChips (Reply 6):
Depending on the type of gearbox used (I'm assuming it's some sort of planetary gearing), it should be possible to turn both props in the same direction by hand while having them go in opposite directions while being powered by the gas turbine.

That makes sense. Rotating them in the same direction at the same speed should result in the turbine (input) shaft remaining stationary.

That also means that in flight the props are equal torque, not equal RPM.

[Edited 2013-01-18 17:00:14]

User currently offlineLoran From Germany, joined Jul 2005, 538 posts, RR: 4
Reply 8, posted (1 year 7 months 2 weeks 1 day 2 hours ago) and read 5284 times:

http://www.liveleak.com/view?i=5ae_1356340461

This one is even better, love the Il-78 and Tu-160 cutting through the clouds seen from above...



703 717 727 732-9 747 757 767 777 787 AB2/6 310 318-321 330 340 380 D8M D91/3/5 D1C M11 M81-90 L10 IL8/6/7/W/9/4 TU3/5/2
User currently offlinecelestar From Singapore, joined Jul 2001, 398 posts, RR: 0
Reply 9, posted (1 year 6 months 2 weeks 1 day 11 hours ago) and read 4062 times:

I read from somewhere that the technology behind the propeller engine for Tu 95 originated from captured German engineer and know-how - which is interesting to know that.
Tu95 is designed to fly long distance, over vast expanse of sea or land. I wonder if the Tu--95 was powered not by propeller but by gas engine, would it still be able to make that range - unrefueled mid-year? Is that long range a reason why the plane is a propeller driven? 1950s engine technology is probably not that fuel efficient, I think.


User currently offlinerwessel From United States of America, joined Jan 2007, 2346 posts, RR: 2
Reply 10, posted (1 year 6 months 2 weeks 1 day 10 hours ago) and read 4055 times:
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Quoting celestar (Reply 9):
Tu95 is designed to fly long distance, over vast expanse of sea or land. I wonder if the Tu--95 was powered not by propeller but by gas engine, would it still be able to make that range - unrefueled mid-year? Is that long range a reason why the plane is a propeller driven? 1950s engine technology is probably not that fuel efficient, I think.

To clarify, the Tu-95 is powered by four NK-12 turboprops (gas turbines).

But yes, the range on jets would have been drastically shorter given the turbojets of the time. Actually even now, if you didn't care about top speed, you'd be better off building a Mach .65 turboprop than a Mach .8 turbofan (which will do much better than a turbojet at subsonic speeds).

The approximately contemporaneous B-36 with the added four outboard jets, would always run with the jets shut down, except when the extra thrust was needed (takeoffs, maximum speed dashes through defended areas, etc.). The B-36's props being driven by pistons, unlike the Tu-95, and the B-36 was 100kts slower.


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