Sunderland Mk III/V propellers

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Sunderland Mk III/V propellers

Postby sunderlandmr5 » Tue Nov 03, 2009 11:25 am

Hi all

Guess this is the best place to put this as the with out the props,
the aircraft would have difficulty flying :D

My sources (plans/technical drawing), state that the Diameter for the Mk III (Pegasus XVIII)
propeller is 12 feet 6 inches. Measuring between cut way plans and drawings this about right.

I have come across some modelling sites selling after market propellers etc that claim that
for the Mk I-III, it should be 13 feet 6 inches. It seems way to large for me as a propeller diameter
for a Sunderland.

None of my books give any info either.

Anyone have any technical data to verify, please?

Second question, Mk V propeller diameter, I understand it to be Hamilton Std 12 feet 6 inches also.

My copy of the Mk V Pilots/Flight Engineers notes mention the propeller, but
no techincal data on diameters etc, again anyone have techical data to verify please?

Thanks

Alan
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Re: Sunderland Mk III/V propellers

Postby Pondskater » Wed Nov 11, 2009 11:42 pm

The Mk V prop was the same Hamilton Standard prop as used on the Catalina, as far as I know.

When 10 Sqn RAAF converted a Mk III into a prototype MkV, they cut down some old AW Albemarle props to 12' 6" and later shortened them further to 12 feet diameter.

I can't find a reference at the moment which shows the diameter of the MkIII props, but if I do I will let you know.

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Re: Sunderland Mk III/V propellers

Postby ant » Wed Dec 02, 2009 11:59 am

Hi guys. I can't find the diameter, but apparently from Mk2 onwards (Pegasus 18s) the propellers were de Havilland constant-speed units. Apparently DH was making Hamilton props under licence from 1935. You may already know this site; it has everything you want to know about props - except the diameters! However, I'm sure the webmaster could answer your questions.

http://www.enginehistory.org/Propellers ... illand.htm

Cheers.
Ant
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Re: Sunderland Mk III/V propellers

Postby ant » Wed Dec 02, 2009 2:48 pm

It seems the de Havilland 5000 series, 2 position variable pitch units fitted to the Empire boats were 12' 9" (3.886m) in diameter with a pitch of approx. 14' (4.63m).
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Re: Sunderland Mk III/V propellers

Postby sunderlandmr5 » Sat Dec 05, 2009 10:59 am

Hi Ant

Thanks for that, the Sunderland pilot told me and also in his commentary
stated that on the Mk III he flew, if an engine was lost, you could not feather
the prop (as it was constant speed) and it made for hard flying. Some aircraft and crews were lost
because of that.

Regards

Alan
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Re: Sunderland Mk III/V propellers

Postby GUMMIPUFFER » Fri Jul 08, 2011 6:45 am

HI FOLKS - AS FAR AS I CAN REMEMBER THE PROPS WE FITTED AT SHORTS BELFAST TO ALL MK V WERE HAMSTD. AND MARKED AS SUCH - REMEMBER P+W OWNED HAMSTD - I AM SURE THEY WERE 12'6" DIA. - THATS WHY 10 SQDN. R.A.A.F. WERE PUSHING TO HAVE SAME ENGINES / PROPS AS THEIR PBY CATS - THANX J.C.
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Re: Sunderland Mk III/V propellers

Postby Philthy » Sun Mar 31, 2013 12:00 pm

if an engine was lost, you could not feather the prop (as it was constant speed)


The prop was not constant speed. As Ant said, the DH 5000 series were variable pitch, but not cs. It is, of course, possible to have cs, feathering or non-feathering props.
Aeradio Operator John G. 'Johnnie' Walker, Karumba Flying Boat Base, 1938.
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Re: Sunderland Mk III/V propellers

Postby sunderlandmr5 » Mon Apr 01, 2013 7:41 am

Philthy wrote:
if an engine was lost, you could not feather the prop (as it was constant speed)


The prop was not constant speed. As Ant said, the DH 5000 series were variable pitch, but not cs. It is, of course, possible to have cs, feathering or non-feathering props.


From the Sunderland III Aircraft Four Pegasus XVIII Engines manual (A.P. 1566C) Volume 1

Early Production Mk III Sunderland
D.H. 5/28, 3 bladed variable pitch (20 degree bracket type) with constant speed control.

Later Production Mk III Sunderland
D.H. DR. 2/345/2, 3 Bladed variable pitch, with constant speed control feathering.

Both Sets of Propellers 12 foot 9inch.
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Re: Sunderland Mk III/V propellers

Postby Philthy » Mon Apr 01, 2013 10:57 am

There you go - that's what you get for being a smartie! :o

Thanks Mr5 for the authoritative info on the Mk III.
Aeradio Operator John G. 'Johnnie' Walker, Karumba Flying Boat Base, 1938.
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Re: Sunderland Mk III/V propellers

Postby robmason » Thu Aug 13, 2015 5:00 pm

Hi guys, Can anyone tell me what material the props were made from?
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