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GOT: The Blohm & Voss BV 222


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#11 simon



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Posted 08 April 2007 - 03:47 AM


#12 Romantic Technofreak

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Posted 10 April 2007 - 11:45 PM

quote:Originally posted by Double T:

I think the US also had a 4-engine model didn't they, a Martin flying boat?

Consolidated PB2Y Coronado, Tim...;)

Regards, RT

#13 Trexx


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Posted 11 April 2007 - 06:25 AM

Wonderful post, RT!

Neat-o German plane indeed.

The BV-222 stimulated development of the H-1 Hercules?
U-be innaccurate. U-boats it was. U-boats.

It's interesting to note that very large airplanes require very long take-off runs.
So long in fact, that some of the very big airplanes during the "golden age" and shortly thereafter had to be sea-planes. There were not runways long enough to accomodate them.The Boeing 314 "Clipper" early behemoth is one as is the Hercules H-1.
The Me-323, the first very large and useful types to have wheels for solid ground, is rightly credited by GregP to be exectionally remarkable.

Rambling on... the Bv-138 is a fav here. I think it's a cool looking 3 motored job.

#14 Geheimprojekte


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Posted 27 October 2008 - 11:16 PM

In the second half of 1943, the exact date isn't known, refuelling experiments with the BV 222 V-7 in the Baltic Sea off Gotenhafen (this is a Nazi-renaming of the city's name. German: Gdingen, Polish: Gdynia) were undertaken. The submarine used was the former Dutch UD 4. But the connection did not prove to be completely shut. Together with the Diesel fuel, water flew into the BV 222's engines, causing a hazard on three ones. The V-7 had to be towed back to Gotenhafen . The experiments were not continued, especially a necessary one in the Bay of Biscay never took place (N162).

One did not need to load high octane petroleum from U-boats. The Bv222 used Fanfir diesel engines. The problem was water in the fuel.

U-boats had diesel fuel in saddle tanks. A large U-boat like a IX type would have around 15-16 tanks along their length for fuel and only the centre tanks and compensating tanks at both ends were used for boyancy. The rest were used for storing diesel fuel. As the U-boat consumed fuel, seawater was pumped in or simply flooded in from beneath. Diesel would float on top of the seawater and the U-boat's engines would draw off the top.

As fuel got low enough for slopping in tanks to contaminate it, Koneigsberg flaps were shut in the bottom and water was pumped in to press remaining diesel out into another fuel tank.

One of the other reasons refueling the Bv222 at sea was abandoned was because it required sheltered calm seas. A warm upwelling of water kept Kane Basin between North Greenland and Ellesmere Island ice free year round.

A few years ago in 2004, a Bv222 navigator Haupt Ernst Koenig told British newspapers how he had orders on 30 April 1945 to evacuate senior Nazis to Japan via Greenland. Either there was to be a refueling off Greenland and a flight to continue on from there or passengers would be offloaded to a U-boat. That aspect is unclear.

#15 SimonG



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Posted 15 December 2015 - 11:31 AM

A excellent thread, thank you.


Picking up on the U-boat refuelling issue, the quantities of petrol/gasoline required for a small E14Y Glen floatplane are miniscule compared with what would have to carried & supplied by U-boat for a BV222.


Possibly the aromatics of petrol make it dangerous for a U-boat since the heat from a submarine's exhaust could potentially cause explosion, however the real issue could be more simple than that.


According to author manfred Griehl (Luftwaffe over America, p.39) the original plan had been for BV222 aircraft to refuel U-boats at sea.


The problem in refuelling U-boats was these carried diesel oil in tanks open to the sea at the bottom. Diesel oil would float on top of seawater. Fuel for U-boat engines were drawn off from the top and as the fuel quantity got low, supply for the engines were switched to another tank, then seawater was pressed into the former tank in to push the remaining fuel out into the next fuel tank.


Extrapolating from this, the problems experienced in trials with the Dutch submarine possibly arose from the method used by U-boats to press fuel out by pushing it out with seawater. 

#16 Armand


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Posted 15 December 2015 - 06:44 PM

Picking up on the U-boat refuelling issue,.......
Possibly the aromatics of petrol make it dangerous for a U-boat since the heat from a submarine's exhaust could potentially cause explosion, however the real issue could be more simple than that.

Diesel engines works without sparkplugs because Diesel self-ignite at a temperature 100' celsius below Petrol (350'C vs. 450'C IIRC)!
Petrol might be easy to ignite by any spark, but in case of heat-effecting (ex. from an exhaust as written) it is Diesel wich is most dangerous!

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