Hazet, Windhoff and other double radiator types…

[Volker_Nemsch]

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I asked this question some years ago, but I got no response. Now it's time to try it again.


The question is about Hazet, Windhoff and other double radiator types and their tubing/piping. Since there are always two of these radiators connected to the cooling system of the engine, this raises the following question.

Was it possible to disconnect one side (or roughly half the system) during flight? In case of an unexpected leak or battle damage it would have offered the crew the possibility to fly for a longer time or to return to the own side of the lines – even if the engine was running very "hot" temporarily. Alternatively, a working engine would have given the crew a chance to glide down and attempt a successful landing with a functioning engine.

I don’t think that the term "additional weight" would have been of real importance, because the needed hand valves and 1 or 2 meters of additional piping would sum up to less than 2 or 3 pounds.

Any ideas, data or photos?

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[Makhpiyaluta]

Volker, the only info I could ever find online about the Hazet is this illustration. It does not show any means of shutting down one side. Should you have more info on the Hazet and/or Windhoff I would gladly see it since I'm still trying to fill some hiats on the Fokker Spinne wich used both types.

Willem

[Volker_Nemsch]

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Thank you for showing this drawing. It is one of the few drawings you’ll find when you are looking for information about Hazet radiators.

On the drawing you’ll find an Endflansch mit Ventil (end-flange with valve), as well as an Endflansch mit Ablaßhahn (end-flange with drain tap). Both are on the upper left side of the drawing.

But I’m missing the terms Sperrschieber (gate valve) oder Durchflussregulierung (flow regulator). But as you can see the picture only shows those parts needed to build these radiators, since it was a part of the concept that they could be lengthened or shortened, depending on the temperatures / needed cooling.

I also have an idea how this device should - probably - have looked like. With a small handle it would have been easy to open or close with thick gloves (something that would have been a problem when using a small handwheel). The photo below shows a contemporary device for a heating system.

https://www.meine-heizung.de/fileadm...c36d481d39.jpg

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[MikeMeech]

Originally Posted by Volker_Nemsch

.
I asked this question some years ago, but I got no response. Now it's time to try it again.


The question is about Hazet, Windhoff and other double radiator types and their tubing/piping. Since there are always two of these radiators connected to the cooling system of the engine, this raises the following question.

Was it possible to disconnect one side (or roughly half the system) during flight? In case of an unexpected leak or battle damage it would have offered the crew the possibility to fly for a longer time or to return to the own side of the lines – even if the engine was running very "hot" temporarily. Alternatively, a working engine would have given the crew a chance to glide down and attempt a successful landing with a functioning engine.

I don’t think that the term "additional weight" would have been of real importance, because the needed hand valves and 1 or 2 meters of additional piping would sum up to less than 2 or 3 pounds.

Any ideas, data or photos?

.

Hi

I am presuming you have looked at the 'Flight' archive? This has some information eg. Dec 31, 1915, pp.1028-1029 on Hazet Radiator. There may be more information tucked away in the various editions that might not appear immediately on a search. There is a mention of the Windhoff in a piece on the Rumpler-Taube monoplane in July 9, 1915 edition, pp. 490-492. Again it may pay to do a variety of searches, as I have found subjects that you are looking for do not always come up searching the obvious 'words', I don't know why.

Mike

[Makhpiyaluta]

You are correct, these radiators came as loose components to be adapted for different engines and needs. I read that at one time they changed the Dichtungsring or sealing ring using rubber to prevent leaking, the previous were all metal. But I've never seen or heard of a valve to shut down one side of the cooling system, and thinking about that a leaking radiator still cools although not as well as a good one, when you shut it down it doesn't do anything. I've studied a lot of Spinne foto's and (at least on the Spinne) there is no evidence of any valve for closing half the cooling system.

Willem

[Pedro Ramis]

Originally Posted by Makhpiyaluta

But I've never seen or heard of a valve to shut down one side of the cooling system, and thinking about that a leaking radiator still cools although not as well as a good one, when you shut it down it doesn't do anything.
Willem

Nice imput Willem!
But the radiator's still losing water, isn't it? I guess that Volker was thinking about trying to fly the planes further towards home with the still available water in the system by closing the leaking side...
My 2cents

[Makhpiyaluta]

Originally Posted by Pedro Ramis

Nice imput Willem!
But the radiator's still losing water, isn't it? I guess that Volker was thinking about trying to fly the planes further towards home with the still available water in the system by closing the leaking side...
My 2cents

What I meant is, if you would close down one side you have only half the amount of water, if you just fly on with one good and one leaking radiator you have more then half the amount of water thus cooling a bit better. The engine will overheat quickly in both cases ofcourse.

Willem

[rednev]

Depends on the leak . A small leak from say a faulty gasket is different from a large leak from one or two bullet holes.