Waiting - 081203_08.jpg (1/1)

[RustY©]

[Bruce R]

"RustY©" > wrote in message
53...t

What's the dirty smudge coming off the left wing root area?


Bruce

[Maple1]

Bruce R wrote:
>
> "RustY©" > wrote in message
> 53...t
>
> What's the dirty smudge coming off the left wing root area?
>
>
> Bruce


APU exhaust

[Isaac A.]

Such an ugly plane , i would'nt waste my time taking pictures of it , as
next pics are showing one of the smartest jet fighter : F 15 ;o)

"RustY©" > a écrit dans le message de news:
...

[Bruce R]

"Maple1" > wrote in message
...>
>> What's the dirty smudge coming off the left wing root area?
>>
>>
>> Bruce
>
>
> APU exhaust

Could you clarify for me item/purpose etc for it? Not being a jet jockey I
am clueless..............no comments from the Peanut Gallery please.


Bruce

[Maple1]

Bruce R wrote:
>
> "Maple1" > wrote in message
> ...>
>
>>> What's the dirty smudge coming off the left wing root area?
>>>
>>>
>>> Bruce
>>
>>
>>
>> APU exhaust
>
>
> Could you clarify for me item/purpose etc for it? Not being a jet
> jockey I am clueless..............no comments from the Peanut Gallery
> please.
>
>
> Bruce


It is the Auto Power Unit sort of like the starter on your car It is a
timy turbine unit. They start it and it has enough power to get the
systems going and turn the main turbine to get the engine going. Prior
to the Apu they used an explosive charge to get the turbine spining Very
cool start up but a pain in the tail pipe.
LOL

[Bruce R]

"Maple1" > wrote in message
...
> Prior to the Apu they used an explosive charge to get the turbine spining
> Very cool start up but a pain in the tail pipe.
> LOL
>
Is that like the starter cartridges you see in the movies starting up some
huge radial engine?

[Maple1]

Bruce R wrote:
>
> "Maple1" > wrote in message
> ...
>
>> Prior to the Apu they used an explosive charge to get the turbine
>> spining Very cool start up but a pain in the tail pipe.
>> LOL
>>
> Is that like the starter cartridges you see in the movies starting up
> some huge radial engine?


Yes

[Dennis[_5_]]

"Maple1" wrote

>> Is that like the starter cartridges you see in the movies starting up
>> some huge radial engine?
>
>
> Yes

Actually, no. The APU, or auxillary power unit, provides electrical power
while the engines are not running. Cartridge starts are a different matter
all together.

When I was at Offutt AFB in the days of Looking Glass, I was called out
because of a stuck "crossover valve". That valve allows air from the left
side over to the right. Normal starting procedure was to start the number 2
engine first, and then use the air off it to start the other three. Since
the crossover wouldn't allow air over to numbers three and four, we made the
decision to do a cartridge start on #3 and use its air to crank up #4.
Mission accomplished with on-time takeoff.

Been 38+ years since I walked off the flight line for that last time, but I
seem to remember in aircraft that were equipped with APU's, they were
generally in a wheel well. Not all fighters aircraft had APU's.







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On 4-Dec-2008, "Bruce R" > wrote:

> Is that like the starter cartridges you see in the movies starting up some
>
> huge radial engine?

There is a famous scene in the movie "Flight of the Phoenix" where they use
those cartridges.

[Dennis[_5_]]

> wrote in message ...

> There is a famous scene in the movie "Flight of the Phoenix" where they
> use
> those cartridges.

Very different cartridges, size-wise, anyhow. The ones used in the movie
were ~ the size of a shotgun shell. The ones used to start a jet engine are
about the diameter of a gallon of ice cream and 1/2 again as tall.

Pic: schoolward bound, Chanute AFB, winter 66-67.