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Author Topic: Big Propeller  (Read 4555 times)

Martin [Admin]

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Big Propeller
« on: September 06, 2010, 08:57:42 am »

See on the BBC News website....

( http://www.bbc.co.uk/news/world-11166650 )
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Prophet

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Re: Big Propeller
« Reply #1 on: September 06, 2010, 10:14:32 am »

that's pretty big, intrests me is it due to fit to a boat, or is it just for show at the fair there having?
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Patrick Henry

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Re: Big Propeller
« Reply #2 on: September 06, 2010, 04:31:21 pm »

Now that would look nice on my Dragonfish.
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Martin [Admin]

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Re: Big Propeller
« Reply #3 on: September 06, 2010, 05:47:47 pm »

Saw this is a restaurant car park in France a few years ago.....
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boater12

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Re: Big Propeller
« Reply #4 on: September 06, 2010, 07:17:28 pm »

Looks like it gives a good 'short / back & sides'  {-) {-) {-)

Cheaper than going to a barbers shop !

Jim.
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ray123

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Re: Big Propeller
« Reply #5 on: September 06, 2010, 08:40:06 pm »

prop shop expanding into ''bigger size''  as the models are getting bigger  {-)
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garston1

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Re: Big Propeller
« Reply #6 on: September 22, 2010, 06:21:00 pm »

Some my son took when his ship CMA CGM BELLINI docked in Singapore. That's a propeller!!
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Umi_Ryuzuki

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Re: Big Propeller
« Reply #7 on: September 22, 2010, 06:26:20 pm »

Temporarily placed for a show in Hamburg....

(photos by Tom Boere)

 ok2
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Prophet

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Re: Big Propeller
« Reply #8 on: September 22, 2010, 07:09:12 pm »

how about these...

largest korts i have ever seen...



the oddest prop i have ever seen apparently its off the QE2



nice big shiny one.. you think they used a dremmel multi to buff the finish  %)



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Martin [Admin]

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Re: Big Propeller
« Reply #9 on: September 22, 2010, 10:14:45 pm »

OK, what Dickens are these?!?!

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Prophet

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Re: Big Propeller
« Reply #10 on: September 22, 2010, 10:22:23 pm »

http://www.roblightbody.com/liners/qe-2/1987_Refit/

info on the QE2 properller and refit here

Prop info near the bottom

QE2's new propellers were completely different to her old ones.  Her old propellers had been fixed pitch, just like her predecessors.  This meant that in order to change speed, she had to actually slow her turbines.  With the new controllable pitch (CP) propellers, the shafts run at a steady speed of either 72 or 144 rpm, and speed is determined by the pitch of the propeller blades.  The new propellers are 5 bladed with a 5.8 meter diameter.  Each propeller is designed to absorb up to 65,000 shp.

QE2 is the first passenger ship to use Grim Wheels (so called because they were invented by Dr Ing Otto Grim) in an attempt to make the new QE2 even more efficient.  These wheels spin freely in the wake of the main propellers.  The innermost parts of each of the 7 blades pick up speed from the propeller, while the outermost parts act as propellers themselves, adding some forward motion to the ship for "free", capturing energy which would otherwise be wasted.  The Grim Wheels are 6.7 meters in diameter.
« Last Edit: September 22, 2010, 10:24:11 pm by Prophet »
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Liverbudgie

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Re: Big Propeller
« Reply #11 on: September 22, 2010, 11:33:43 pm »



QE2 is the first passenger ship to use Grim Wheels (so called because they were invented by Dr Ing Otto Grim) in an attempt to make the new QE2 even more efficient.  These wheels spin freely in the wake of the main propellers.  The innermost parts of each of the 7 blades pick up speed from the propeller, while the outermost parts act as propellers themselves, adding some forward motion to the ship for "free", capturing energy which would otherwise be wasted.  The Grim Wheels are 6.7 meters in diameter.

This set up worked very well and added two or three knots until, that is the blades started to fall off during or soon after trials, the rest were removed soon afterwards. It was indeed, a grim time for Dr. Grim.

LB

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