Author Topic: Shackleton 1722  (Read 5324 times)

K_F

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Shackleton 1722
« on: January 26, 2014, 04:46:44 AM »
I believe this is the last flying 'Shack'.. has something like 10 hours left on it's airframe.
Not sure if it flies or not.. but they had a 'ground run'  (test engines.. etc) today.
It was a real buzz.. when those engines were at full power.. the ground was vibrating under my feet..

https://www.dropbox.com/s/wripw7c1095l9qa/Shackleton1722.mp4 (63MB)
'Sire, Sire!... the peasants are Revolting !!!'
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Gunther

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Re: Shackleton 1722
« Reply #1 on: January 26, 2014, 10:24:28 PM »
Hi K_F,

that's impressive.  :t

Gunther
Get your facts first, and then you can distort them.

KeepingRealBusy

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Re: Shackleton 1722
« Reply #2 on: January 27, 2014, 05:22:12 AM »
I noticed that the aircraft had a South Africa flag on the tail (I think that is what it was). I also noted that it appears to have counter rotating props on each engine. I wonder what sort of strain that puts on the props as the blades pass each other?

Dave.

dedndave

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Re: Shackleton 1722
« Reply #3 on: January 27, 2014, 09:33:49 AM »
never heard of that one before
poked around a little and found this site

www.thegrowler.org.uk

KeepingRealBusy

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Re: Shackleton 1722
« Reply #4 on: January 27, 2014, 01:49:15 PM »
Wiki had a little on the Shackleton, including that they were used in the UK and SA for coastal defense. That is where I got the SA connection.

Dave

K_F

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Re: Shackleton 1722
« Reply #5 on: January 28, 2014, 06:09:08 AM »
I noticed that the aircraft had a South Africa flag on the tail (I think that is what it was). I also noted that it appears to have counter rotating props on each engine. I wonder what sort of strain that puts on the props as the blades pass each other?

http://en.wikipedia.org/wiki/Contra-rotating_propellers
'Sire, Sire!... the peasants are Revolting !!!'
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KeepingRealBusy

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Re: Shackleton 1722
« Reply #6 on: January 28, 2014, 02:26:47 PM »
I noticed that the aircraft had a South Africa flag on the tail (I think that is what it was). I also noted that it appears to have counter rotating props on each engine. I wonder what sort of strain that puts on the props as the blades pass each other?

http://en.wikipedia.org/wiki/Contra-rotating_propellers

Thank you for the link. I stand corrected on the nomenclature - Contra-rotating vs counter-rotating.

Obviously not a problem here, but I thought I had heard of problems in wind powered (windmill farm) applications where there were problems with vibrations as the blades passed by the tower.

Dave.

dedndave

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Re: Shackleton 1722
« Reply #7 on: January 28, 2014, 03:06:15 PM »
there are some problems with vibration and noise (a result of vibration, of course)

but, with more modern techniques, the problems could probably be reduced
i'm sure you've seen modern aircraft with curved wing tips or winglets



they reduce wing-tip vortices, and are thus more efficient

the same techniques may be applied to propellers, with some changes