What do you call the stack on top of the Albatros D.V radiator?

[shackleton]

Originally Posted by Greybeard

I agree with Dan-San.

Pressurized coolant circuits not existed yet.

GB

A further complication of an atmospheric pressure coolant circuit is that the boiling water temperature reduces with altitude. I don't think glycol was in use during the first war so assuming water was used as a coolant it will boil at a lower temperature of 1 degree Fahrenheit for each 500 feet of altitude. That would mean water coolant would boil at 212 F at sea level,

202 F at 5000 feet
192 F at 10000 feet
182 F at 15000 feet.
This could be set against the lower temperatures of the air that cools the radiator at higher altitudes and the reduction of power and hence heat generation of an unsupercharged engine at altitude.

The lovely Anna in impeccable Hochdeutsch informs me that the name of the gadget on top of the radiator on an Albatross is called

Das Verdammtemetaldingaufderheizungsteht.

You can shorten it to VMDAHS if you wish.

[Greybeard]

Originally Posted by shackleton

A further complication of an atmospheric pressure coolant circuit is that the boiling water temperature reduces with altitude.

...

This could be set against the lower temperatures of the air that cools the radiator at higher altitudes and the reduction of power and hence heat generation of an unsupercharged engine at altitude.

True.

Though, as a rule of thumb, since both reduces with atmospheric pressure, the balance remains virtually unchanged.

GB

[Vati]

This is very interesting thread. I have additional questions for it.
We can see on some scouts additional handle which controlled airflow deflector. Anyone knows the procedure for operating this at that time, as I understand there was no temp instrument in cockpit? Was this addition only for specific engines?

[Dan_San_Abbott]

Hello Vati:
If they did not have a water temperature guage in the cockpit, there was a temperature near the top of the metal tube that runs from the top of the engine to the radiator. It was a Idflieg requirement that a water temperature be on every engine to be monitored by the pilot Also the was a required to be able to regulate the water temperature in the radiator with a shield to block the flow of air through the radiator that could be controlled by the pilot.
You will find this shield either in front of or onthe rear of the radiator and a control lever in the cockpit or under the wing as on the Albatros and Pfalz machines with wing mounted airfoil radiators.
Blue skies,
Dan-San

[Vati]

Dan-San,

Thank you for your great insight on the matter. Is there any photo or drawing reference how this thermometer looked like?

[edit]All I found were these attached photos. However I would really love to see something like these on photos/drawings of Albatros or Pfalz scouts.

[Vati]

Aaah.. found it finally on one picture where it can be seen clearly.

[Ransom E. Olds]

Dan San: Did some Albatros D.V and D.Va have radiator shutter control from within the cockpit? I ask the question because the Australian and the Smithsonian planes both have the wing-mounted levers, but the well-known photo of Vfw. Ernst Hamscher shows his plane to have no indication of a wing-mounted lever. I had assumed that a photographer seeking a more pleasing composition had removed the offending lever, but maybe there never was one externally mounted on Hamscher's Albatros. Ransom