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BA-609 Or V-22 Engine Failure  
User currently offline777 From Italy, joined Sep 2005, 515 posts, RR: 0
Posted (7 years 3 months 1 day 1 hour ago) and read 3410 times:

Hi fellows,

Following the recent BA-609 exhibitions both in Pratica di Mare (Rome) and Le Bourget Airshows, I have a question for you: what does it happen to that tilt rotors in case of engine failure? Is it a single engine able to give its power to both rotors in case you have lost the other one?

I hope so...

Thanks for you replies!

5 replies: All unread, jump to last
 
User currently offlineXv408 From United Kingdom, joined Nov 2006, 52 posts, RR: 0
Reply 1, posted (7 years 3 months 1 day 1 hour ago) and read 3397 times:

Not sure on the margins, but there is a cross-linking shaft to ensure both rotors are driven in the case of engine failure.

User currently offlineStarlionblue From Greenland, joined Feb 2004, 17044 posts, RR: 67
Reply 2, posted (7 years 3 months 21 hours ago) and read 3363 times:

As Xv408 mentions, each engines can power both rotors through shafts running in the wing. Basic common sense I guess. This system has been in use on double rotor helicopters for decades.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineBHMBAGLOCK From United States of America, joined Jul 2005, 2698 posts, RR: 5
Reply 3, posted (7 years 2 months 3 weeks 5 days 10 hours ago) and read 3191 times:

Quoting Starlionblue (Reply 2):
This system has been in use on double rotor helicopters for decades.

It's a bit different on a CH-46/7 in that the shaft always carries half the power(on average); this is its primary role. In a tilt-rotor, the primary role of the interconnecting shaft is to synchronize the two rotors. In the case of an engine failure it is capable of transferring power between nacelles for the duration of the emergency but is not designed to take the associated loads continuously.



Where are all of my respected members going?
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17044 posts, RR: 67
Reply 4, posted (7 years 2 months 3 weeks 5 days 6 hours ago) and read 3167 times:

Quoting BHMBAGLOCK (Reply 3):
It's a bit different on a CH-46/7 in that the shaft always carries half the power(on average); this is its primary role. In a tilt-rotor, the primary role of the interconnecting shaft is to synchronize the two rotors. In the case of an engine failure it is capable of transferring power between nacelles for the duration of the emergency but is not designed to take the associated loads continuously.

Good info thx. Do you know how the Mi-12 operated? 4 engines in nacelles under 2 rotors with cross-connect.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineKELPkid From United States of America, joined Nov 2005, 6392 posts, RR: 3
Reply 5, posted (7 years 2 months 3 weeks 5 days 3 hours ago) and read 3152 times:

Quoting BHMBAGLOCK (Reply 3):
It's a bit different on a CH-46/7 in that the shaft always carries half the power(on average); this is its primary role. In a tilt-rotor, the primary role of the interconnecting shaft is to synchronize the two rotors. In the case of an engine failure it is capable of transferring power between nacelles for the duration of the emergency but is not designed to take the associated loads continuously.

Doesn't the shaft also serve the same purpose in the CH-46 and CH-47? I thought that the rotor arcs between the front and rear rotors actually crossed, and that this was possible because the rotor blades were synchronized...of course, I may be mixing up the Boeing Vertol/Piasecki system with the Kaman rotor system  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
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