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March 10, 2013 at 10:02 pm in reply to: Fairey Battle question. #966390

Beermat
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Worth remembering, though, that an original selling point of the hydromatic was the ability to feather blades in the case of engine failure on multi-engine types, so less imperative to introduce them on singles..

March 9, 2013 at 3:43 pm in reply to: Spitfire X4650 question #968518

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Thanks Pete. Thought it was odd.

March 8, 2013 at 5:35 pm in reply to: Spitfire restoration costs #969700

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I thought the US restriction on proprietery secrets with vintage types has been quashed by the Greg Herrick – Fairchild 45 drawings legal case

http://www.lightaircraftassociation.co.uk/2012/News/us_records.html

“The new law invalidates the trade secret claim for aircraft from that era”

Interesting stuff! But I fear it only applies to the FAA records, and a manufacturing company are still not obliged to part with anything they don’t want to. But it does point to an interesting avenue for our reseach.. thanks.

March 8, 2013 at 2:49 pm in reply to: Spitfire restoration costs #969875

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Russell, do you still have that 3D40?:)

With reference to this old thread – was recently foiled in my attempts to get blade data from Hamilton Sunstrand (ex Hamilton Standard) and also one of their former licence holders in Europe for a blade type from 1935, and not used on anything since 1947

The offiicial reasons? Proprietry and confidential design data (US) – and a military secret (Sweden).

February 26, 2013 at 12:56 pm in reply to: Seen on eBay – 2013! #982272

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DC3 elevator? Seems inexpensive.

http://www.ebay.co.uk/itm/DC3-Wing-Sections-Make-Your-Own-Great-aircraft-desks-/181084707389

February 26, 2013 at 10:21 am in reply to: propellor id? #982403

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I have just checked the shank size as submitted by the OP – what we have here is a Westland Whirlwind blade – I am now 100% on this. Extraordinarily rare (no other production aircraft used the 54409 blade), probably not very valuable as not Spitfire!

Does anyone know how to contact this poster?

February 23, 2013 at 10:51 am in reply to: propellor id? #986275

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Anon. All true. It is simply the wrong shape for Lysander or Blenheim. Dimensions look wrong for a Spit’s 55409. I have a strong suspicion that this is a DH dp54409 blade. Confirmation would come from rotation, a measurement of shank size and precise length/max width/position of max width, as no other DH counterweight blades had the combination of RH rotation, shank size ‘4’ and approx 55 inch length/9 inch width at 50% radius. This is not ‘armwaving’.. I have spent 2 years on this and researched at Farnborough, and elsewhere.

If it is, reading my signature will show why I perked up when I saw it. Hen’s teeth indeed.:D

I am fully aware that it might not be, but you can see why I’d wish to measure it.

February 22, 2013 at 9:29 pm in reply to: propellor id? #986856

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Fallen over this ancient thread, and my jaw dropped.

Is the OP still around? I am prepared to bet that I know exactly what this is..

February 19, 2013 at 8:45 am in reply to: Spitfire from Lowestoft. #991127

Beermat
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Wonderful, inspiring stuff. Well done that man!

February 18, 2013 at 12:29 pm in reply to: Data Plate. How much? #992728

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Got an idea where there maybe one or two, I’ll dig out my mask, snorkel and flippers.

Has the Isle of Wight sunk? :dev2:;)

But seriously, Ian, if you really do have an idea where the Channel Isles ones are, we’d be delighted to hear more.

February 16, 2013 at 5:40 pm in reply to: Any aerofoil experts out there? #994660

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Hi Jeff

That’s a thought. We are waiting for the results of a 3 d scan of a wind tunnel model – it will be interesting to see if the profiles match..

Re the 5 digit Mainplane, that foil does fit with everything else we know, too. Funnilly enough I wa just thinking about trying a 5 digit naca foil with suffix modifiers to see if I can produce something similar to the tail section – that may be how the same numbers as the 63A-017 were generated. I wish I was better at maths! Can somebody tell me if this is feasible before I wear out another pencil?

February 16, 2013 at 10:30 am in reply to: Any aerofoil experts out there? #995135

Beermat
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Yes, to be fair what we are using are the scaled co-ordinates presented by the wind tunnel model plans, cross-checked with a small number of factory drawings of the tail acorn showing partial aerofoil. But the smoothed result happens to match to the point where the two plots drawn full-scale with 2mm lines overlay each other.

The naca plots were mathematically generated theoretical shapes, so could be called exact..

It is another section that matches with this degree of accuracy that I cannot find. But it existed in 1938, and would have been called something else. The 6 series were first documented in 1940.

February 15, 2013 at 5:54 pm in reply to: Any aerofoil experts out there? #995700

Beermat
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Indeed not! But I have exhausted the ‘usual suspects’ in trying to find a match. I’d be grateful for anything you find!

Great link. Here’s another for the hardcore: http://history.nasa.gov/SP-4305/ch4.htm

February 12, 2013 at 8:00 pm in reply to: What do I have here? #999612

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Good luck! Hope you get those pics.

February 3, 2013 at 2:03 pm in reply to: What book would you like to see on the big screen? #1011445

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There was a bloke on here – ‘NewGuy’ – who was working on a Bob Tuck screenplay. I wonder how he is getting on?
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