Does anyone recognise this prop manufacturer’s logo? It will be from the US, late 1930’s, and it appears on a blade of type Navy Bu Aer drawing 5868-9.
I was thinking it was Hamilton Standard, but comparison with its immediate neighbour – which definitely IS Ham Stand, has made me think again.
..and yes, it is the blade design otherwise known as 54409 when manufactured by DH, and the one that goes on a whirly!!
By: Beermat - 29th October 2012 at 13:26
..though it’s something others are more qualified than me to do. Matt P, what are your plans on this area?
By: Beermat - 29th October 2012 at 11:16
Yes, I am now thinking along those lines – that, or take a Blenheim or Lysander unit and reverse it in CAD..
Cheers,
Matt
By: Arabella-Cox - 28th October 2012 at 21:11
Cylinder size
Would it be possible, or feasible to measure or computer “map” the size 5 and produce a slightly smaller one using the benefits of computer CAD/CAM technology, I wonder?
Anon
By: Beermat - 28th October 2012 at 17:30
Thought as much – thanks. So the problem remains, producing or finding a 4 series Right Hand dH bracket hub, or at least the cylinder.
By: Arabella-Cox - 28th October 2012 at 17:22
Not the same.
There are also slight differences within the No5 cylinder size as well.
DAI
By: Beermat - 28th October 2012 at 17:16
Does this mean that the cylinders on 5 series props as per Spitfire/Merlin are the same size as 4 series (eg Whirlwind /Peregrine, 4/4)?
32
By: Arabella-Cox - 28th October 2012 at 16:57
Cylinder
You will, therefore, need a cylinder for a RH rotation prop, such as that from an early Spitfire. I have got an intact one from a crashed prop and intend to remove it as another Forumite needs it for the same reason – to make a copy for his prop.
It would be possible, if the necessary allowances were made for shrinkage, etc., to use it as a pattern for casting another one.
Anon.
By: Beermat - 28th October 2012 at 14:03
:diablo:..and cast into that cylinder (very much part of the hub assembly) in 2 possible orientaions depending upon direction of rotation. I have just fallen over this problem on another thread – we can’t use Lysander/Blenheim or whatever hubs on our Whirlwind unless we replace the cylinder with a RH one. Any ideas how we get around this – how easy would it be to cast a new cylinder?
By: coldkiwi1 - 9th January 2012 at 18:50
From the shape of the butt area it looks like a Curtiss blade.
By: coldkiwi1 - 9th January 2012 at 18:50
From the shape of the butt area it looks like a Curtiss blade.
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January 9, 2012 at 5:53 pm