Third "turbine" on top of large Mil helis?

[[email protected]]

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/

[bBob]

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

Got a pic?

[[email protected]]

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/

[Sla#s]

> 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

[JP]

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/
>

[JP]

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/
>>
>
>

[[email protected]]

Thanks for that. Mystery solved :)

[[email protected]]

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 :)

[Sla#s]

"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

[JP]

"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