Thanks, Chris T.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chris Trask" <christrask@xxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>; "Olympus Camera
Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 09, 2012 8:15 AM
Subject: Re: [OM] IMG: An Infrequent Visitor
> >
>> > I suspect it helps, but the aircraft is noisy on the ground.
>> > Even the co-pilot called it loud. It may be the interplay
>> > between the five-bladed props and the twin exhausts of the
>> > engine in each nacelle.
>>
>>
>> It's probably the prop blades feathered but with the engine
>> still turning over at normal speed. The C-130 is pretty noisy,
>> and unmistakeable, on the ground.
>>
>> But I suspect a former C130 pilot would know better . . .
>>
>
> Might be that the engine exhaust passing through the prop is the
> source of most of the noise. On the C-130 most of the noise was due to
> the supersonic blasts caused by the adjacent props. Since they spin in
> the same clockwise direction, the speed of the air between them is no
> small matter. There is a "sync master" on the right side of the flight
> deck that keeps the props 45 degrees apart so as to minimize the noise, if
> it works. You could adjust the one control to change the phase angle and
> move the centre of the noise.
>
> The new Airbus M400 solved that by having the adjacent props turn in
> opposite directions. Nice looking plane, especially with the topside
> spoilers. But fuel efficiency and range are not very good. It has twice
> the power of a C-130J, but the Snecma engines are fuel hogs.
>
> Chris
>
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