FlexJetOKC
Topic Author
Posts: 48
Joined: Mon Feb 07, 2011 2:05 am

Behind The Scenes Of The TU-95 Bear

Thu Jan 10, 2013 5:32 pm

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...
 
spantax
Posts: 302
Joined: Fri Nov 05, 2004 4:44 pm

RE: Behind The Scenes Of The TU-95 Bear

Thu Jan 10, 2013 6:00 pm

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
 
JoeCanuck
Posts: 3938
Joined: Mon Dec 19, 2005 3:30 am

RE: Behind The Scenes Of The TU-95 Bear

Thu Jan 10, 2013 11:51 pm

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...?
 
 
GDB
Posts: 12652
Joined: Wed May 23, 2001 6:25 pm

RE: Behind The Scenes Of The TU-95 Bear

Sun Jan 13, 2013 9:49 am

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 avatar
Francoflier
Posts: 3688
Joined: Wed Oct 31, 2001 12:27 pm

RE: Behind The Scenes Of The TU-95 Bear

Sun Jan 13, 2013 11:54 am

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'll do my own airline. With Blackjack. And hookers. In fact, forget the airline.
 
MrChips
Posts: 933
Joined: Wed Mar 30, 2005 2:56 pm

RE: Behind The Scenes Of The TU-95 Bear

Wed Jan 16, 2013 9:56 pm

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!
 
titanmiller
Posts: 86
Joined: Thu May 25, 2006 2:57 pm

RE: Behind The Scenes Of The TU-95 Bear

Sat Jan 19, 2013 12:59 am

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 avatar
Loran
Posts: 574
Joined: Mon Jul 04, 2005 11:13 am

RE: Behind The Scenes Of The TU-95 Bear

Sun Jan 20, 2013 5:02 pm

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...
703 717 727 732-9 747 757 767 777 788 AB2/6 310 318-321 330 340 380 D8M D91/3/5 D1C M11 M81-90 L10 AN2/3/F/4/6/28/74/40/58 IL1/8/6/7/W/9/4 TU3/5/2 YK4/2
 
celestar
Posts: 494
Joined: Mon Jul 09, 2001 11:37 am

RE: Behind The Scenes Of The TU-95 Bear

Tue Feb 19, 2013 8:06 am

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.
 
rwessel
Posts: 2448
Joined: Tue Jan 16, 2007 3:47 pm

RE: Behind The Scenes Of The TU-95 Bear

Tue Feb 19, 2013 8:35 am

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.

Who is online

Users browsing this forum: 3wheelbogey and 8 guests