Third "turbine" on top of large Mil helis?

Hi, many of the large Mil helis have what looks like a third turbine
above, and slightly behind the two main turbines. What is it? All of
the specs for these helis say they have two turbines. I can see blades
in some photos, so it's obviously something like a turbine.


Thanks, Justin.

http://soupisgoodfood.net/

wrote in message
oups.com...
Hi, many of the large Mil helis . . . . .

Got a pic?

http://www.airliners.net/open.file/1011699/M/
http://www.airliners.net/open.file/0857039/M/
http://www.airliners.net/open.file/0658477/M/
http://www.airliners.net/open.file/0863587/M/
http://www.airliners.net/open.file/0646747/M/

wrote in message
oups.com...
Hi, many of the large Mil helis have what looks like a third turbine
above, and slightly behind the two main turbines. What is it? All of
the specs for these helis say they have two turbines. I can see blades
in some photos, so it's obviously something like a turbine.

Oil Cooler fan

Slatts

That is an auxiliary power unit (APU) for pneumatic main turbine starting.
Required for self-contained operations. At least some models of Mil are
equipped with Ivchenko AI-9V APU unit.

Use e.g. Vivisimo meta-search engine www.vivisimo.com and type "Mil Mi APU"
and you get more information about the subject.

JP


kirjoitti
glegroups.com...
Hi, many of the large Mil helis have what looks like a third turbine
above, and slightly behind the two main turbines. What is it? All of
the specs for these helis say they have two turbines. I can see blades
in some photos, so it's obviously something like a turbine.


Thanks, Justin.

http://soupisgoodfood.net/

Oil cooler fan mentioned earlier is not a bad idea after all! Some larger
Mil helos may have a main transmission cooling system located just there.

JP

"JP" kirjoitti
...
That is an auxiliary power unit (APU) for pneumatic main turbine starting.
Required for self-contained operations. At least some models of Mil are
equipped with Ivchenko AI-9V APU unit.

Use e.g. Vivisimo meta-search engine www.vivisimo.com and type "Mil Mi
APU" and you get more information about the subject.

JP


kirjoitti
glegroups.com...
Hi, many of the large Mil helis have what looks like a third turbine
above, and slightly behind the two main turbines. What is it? All of
the specs for these helis say they have two turbines. I can see blades
in some photos, so it's obviously something like a turbine.


Thanks, Justin.

http://soupisgoodfood.net/

Thanks for that. Mystery solved

Justin, Look at first picture. Left rear of cowling shows small exhaust
for APU (I'd guess about 5 in. compared to larger main engines).

Ed R.

wrote:
Thanks for that. Mystery solved

"JP" wrote in message
...
That is an auxiliary power unit (APU) for pneumatic main turbine starting.
Required for self-contained operations. At least some models of Mil are
equipped with Ivchenko AI-9V APU unit.

Use e.g. Vivisimo meta-search engine www.vivisimo.com and type "Mil Mi
APU"

The APU is behind the transmission.

Slatts

"Sla#s" kirjoitti
where.com...

"JP" wrote in message
...
That is an auxiliary power unit (APU) for pneumatic main turbine
starting. Required for self-contained operations. At least some models of
Mil are equipped with Ivchenko AI-9V APU unit.

Use e.g. Vivisimo meta-search engine www.vivisimo.com and type "Mil Mi
APU"

The APU is behind the transmission.

Slatts



Yes I agree, it seems to be the case. The APU is behind the main
transmission. The "third turbine" has to be an oil cooler fan.

JP