Various Blohm und Voss projects

[Motocar]

Next cutaway drawing BV P.210

Ready speculative cutaway drawing Blohm & Voss P-210, link

http://www.secretprojects.co.uk/forum/index.php/topic,23005.msg310600.html#msg310600

Saludos newsdeskdan...!

Certainly the work of Peter Allen differs, only accompanies the speculative cutaway, is very vague information of that project although some models have flown testing the validity of the design. Just a small and modest contribution to the thousands of projects that were left in the inkwells ...! Motocar
Lovely, but this is the only known contemporary drawing of the Blohm & Voss P 210, from German Aircraft: New and Projected Types. Flitzer's art... differs from it somewhat.

 

[hesham]

From Le Fana 300.

 

[starmountain]

Second project BV 138 with little engine nacelle turret.

Hi Dan, do you have the source from this very early Ha 138 Drawing? This report was entitled "Chronik des See-Fern Aufklärers von 1933 bis zum heutigen Tage" (Chronicle of the long range maritime reconnaissance seaplane types from 1933). I am really interested in this chronicle report, which could have been published by the Travemünde test center.
Kind regards,
starmountain

 

[Airborne2001]

Do we know if the BV P.215 ever achieved wind tunnel testing and/or a mockup being built?

 

[starmountain]

I don't think, there was a mockup of the Bv P.215. Wind tunnel testing perhaps.
But this drawing is great
Regards,
starmountain

 

[hesham]

Was there a Blohm & Voss P.215.03 ?.

 

[Zizi6785]

Very interesting and never seen photo: Blohm & Voss P 211 wind tunnel model from FliegerRevue X 90

 

[Raketyr]

From the TV documentary series: German secret aircraft ...

 

[Orionblamblam]

From the TV documentary series: German secret aircraft ...

Huh. 3302 in particular looks kinda fake to me.

 

[Raketyr]

From the TV documentary series: German secret aircraft ...

Huh. 3302 in particular looks kinda fake to me.

I also think that pictures are animations.

 

[sienar]

The 2nd one shows a very obvious seam between the shadow and wingtip.

Besides that its a very large model. Were they even running the big tunnels at the end of the war? The power usage of such tunnels is immense and its hard to see them using the bigger tunnels unless they could avoid it.

 

[hesham]

Very interesting and never seen photo: Blohm & Voss P 211 wind tunnel model from FliegerRevue X 90

As the text tells us,it was not fake;

Bottom left: The wind tunnel model
of the hunter Blohm &
Voss P 211, a competing project
to He 162, is behind
End of the war unnoticed
the company's premises.

 

[newsdeskdan]

The 2nd one shows a very obvious seam between the shadow and wingtip.

Besides that its a very large model. Were they even running the big tunnels at the end of the war? The power usage of such tunnels is immense and its hard to see them using the bigger tunnels unless they could avoid it.

As the text tells us,it was not fake;

Bottom left: The wind tunnel model
of the hunter Blohm &
Voss P 211, a competing project
to He 162, is behind
End of the war unnoticed
the company's premises.

It seems unlikely to be genuine. On October 12, 1944, Richard Vogt wrote a brief history of his involvement in the Volksjaeger project. He was feeling embittered because his design lost and he wanted to make sure posterity knew - when the He 162 failed - that he had been right all along.
He recounts the various twists and turns - his original design, drafted between September 10, 1944, and September 14, 1944, was the swept-wing P 211.01-01. Having seen Heinkel's simpler and less risky P 1073 at the comparison meeting on Semptember 14, his engineers revised the P 211 to create the straight-wing P 211.01-02 (the design apparently shown in the FliegerRevue X 90 photos). This was described in a new report dated September 29, 1944.
So the new design was created - on paper - in two weeks.
But Hitler had already been persuaded to approve the P 1073 on September 23, 1944. And Knemeyer formally announced this decision on September 29 - the same day that the P 211.01-02 design was published.
Vogt was annoyed because he felt that the P 211.01-02 was now superior to the P 1073 (he was probably right) but his design had been rejected primarily on the basis of concerns about the length of the intake duct. So first, on October 2, 1944, Vogt appealed the decision and his appeal was rejected.
Then he invited the very well respected Dietrich Kuechemann from the AVA to Hamburg to assess his design, particularly with regard to the intake duct - and Kuechemann reported the following day (October 5) that the P 211.01-02 was superior to the P 1073 in most respects. The B&V duct was relatively short and unlikely to result in reduced airflow to the engine, he wrote, and with the P 1073 there were unresolved concerns about the effect of the boundary layer on the intake positioned above the fuselage.
And here's the interesting bit:
Kuechemann arranged for 'rough' wind tunnel tests to assess the effect of air flow on ducts of different lengths and from different angles and whether vibrations occurred under different conditions. The tests found that airflow was unaffected up to angles of 60-degrees.
The models used in these tests appear to have been different lengths of cylindrical piping with either a 'sharp' or 'rounded' edge. Kuechemann's text (undated, but definitely received by Vogt on or before October 12 - see below) says: "Die Abrundung des Rohreinlaufes bringt, gegenueber dem scharfkantigen Rohr, nur ein frueheres Einsetzen der Schwingung bei etwas kleineren Schraeganblasungswinkeln."

I wrote in Secret Projects of the Luftwaffe: Heinkel He 162 and also in Secret Projects of the Luftwaffe: Jet Fighters 1939-1945 that the AVA had conducted wind tunnel tests which proved that Vogt's intake duct was fine. And they did. But they didn't go to the time, trouble and expense of constructing a full scale P 211.01-02 model! They just used bits of pipe.
However, if all you knew was the that the AVA carried out wind tunnel tests to prove that the P 211.01-02's duct was fine, you might think that such a model had been built for that purpose. But it wasn't. Vogt sent the results of the AVA tests to the Chef-TLR on October 14 but clearly by this point the He 162 was unstoppable.
The bill for B&V's involvement in Volksjaeger appears to have been RM 1100 and the invoice for this sum seems to bounce around between various different institutions well into January 1945 and it's not clear if B&V ever got paid for it.
The P 211.01-02 only really existed for a couple of weeks before it was well and truly rejected. Building a large wind tunnel model of it would have been utterly pointless.

 

[Raketyr]

Very interesting and never seen photo: Blohm & Voss P 211 wind tunnel model from FliegerRevue X 90

As the text tells us,it was not fake;

Bottom left: The wind tunnel model
of the hunter Blohm &
Voss P 211, a competing project
to He 162, is behind
End of the war unnoticed
the company's premises.

Just for comparison ...

 

[sienar]

That natter looks fake too. Again the shadows look off and the wing break is really odd.

 

[Raketyr]

That natter looks fake too. Again the shadows look off and the wing break is really odd.

Sure, the same background was used for different 3D models.

 

[fightingirish]

The newest November issue of the German magazine "Flugzeug Classic 11/21" features an article about the proposed Blohm & Voss BV P 211.02 "Volksjäger" as part of the Emergency Fighter Program design competition. Again, the graphics for this article is contributed by the aviation artist Anastasios Polychronis.

Technik - Typengeschichte
Blohm & Voss BV P 211.02: Der wirkliche „Volksjäger“?
Der noch bei Kriegsende hergestellte „Volksjäger“ Heinkel He 162 ist bis heute bekannt. Es gab aber auch weniger berühmte Alternativen wie die P 211.02. Wäre sie die bessere Option gewesen?

 

[Ivan Culjak]

The variable incidence wing was originally conceived by him for his flying boats so that the fuselage would have the correct position to the water surface during landing independent of the angle of approach of the wing. This is critical because the touch down of the tail in the water could generate a momentum to cause the aircraft nose to dive into the water during landing. The implementation of the variable incidence wing was facilitated by the typical wing construction method of Vogt - using one strong hollow steel spar for the wing which was at the same time the axle of rotation for the wing.

Another field of application for the variable incidence wing is when tandem (bicycle) landing gear has been used.
There are many advantages of bicycle gear for bombers - like bigger and cleaner bomb bay and less pressure on tires. So, many early jet bombers had it. But there is one big difficulty, too. When using tandem gear, both gears (front/rear) are getting off the ground and landing at the same time ( to see when a B-52 takes off) . So there is no nose rotation - so how to produce lift, how to take off? An elegant solution is the use of variable incidence wings. The case for variable incidence wing has been really good explained in a book: Luftwaffe - Secret Bombers of the Third Reich by Dan Sharp (chapter on P.188)

There are less elegant solutions, too - B-47 had longer nose wheel, so while on ground, a nose is pointing up; B-52 has a permanent positive incidence of wings so it flies horizontally with a nose pointing down, some Soviet jets had two stage nose wheel, and so on..

 

[HortenVIII]

Here a drawing of Blohm And Voss Ha 140 from Nowarra's last edition book. The drawing is labelled as Ha 140 V1-01.
4 things are different for me:

1. Engine cowl looks like V-12 (instead BMW Radial 132)
2. The fuselage is longer (exceed rudder)
3. Rudder shape is different (round)
4. Wing shape in W

The BV P.19 is listed with 2x Jumo 210, it can be an early drawing of Ha 140 indeed. Quite interesting.

Nowarra's specification:
Spann 21m (21.8m on the drawing for me)
Length 17.6m
Height 5.5m

V1 to V3 specification
Spann 22m
Length 16.75m
Height 5.9m

 

[hesham]

Sharp note HortenVIII.

 

[hesham]

From Air Pictorial 1963.

 

[hesham]

From this report,

a very strange projects (the lower two designs) ?,BV.333 Bomber ?.

 

[Jemiba]

At least the lower one (BV Steuerung) is described as a gyro controlled flight control system, not an aircraft project.

 

[The Wooksta!]

Re the P.188.02

Are there any decent drawings of the main gears? I've got the Unicraft resin approximation (I cannot use the work "kit") and that indicates single wheel on a single leg in two separate positions either side of the fuselage. Even for Blohm und Voss, that's just plain stupid. The drawings I've seen are just not clear enough.