• Hi Guest! Forum rules have been updated. All users please read here.

Borovkov/Florov advanced biplanes

redstar72

Soviet Aviation enthusiast
Senior Member
Joined
Jun 7, 2009
Messages
519
Reaction score
63
Alcides said:
I've to say maybe we need to start a thread about Borovkov-Florow projects because I didn't know about the Aircraft 10 and 11 projects. A search in on the web shows a lot about the I-207. Are these advanced versions of 207?
Not quite, but in some way...

The I-207 program came to its final, but Alexei Borovkov and Ilya Florov didn’t think it was all over for the biplanes. They actually believed that biplane can fly as fast as monoplane… at least as fast! So, the “10” and “11” projects appeared…


Borovkov/Florov “Aircraft No.10”
Design date: 1940
Purpose: high-speed maneuverable fighter, escort fighter, dive bomber
Engine: 1x Shvetsov M-71 (1700/2000 hp); 1x Merkulov DM ramjet
Crew: 1
Wing span: 9.5 m
Length: 8.35 m
Wing area: 24.0 m2
Takeoff weight: 3500 kg
Wing loading: 146 kg/m2
Maximum speed without ramjet: 650 km/h
--//-- with ramjet active: 750…800 (840?) km/h
Climbing to 8000 m (with ramjet active): 8.0 min
Flight range: 800 km
Turn time: 14…16 seconds
Weapon: 1x 12.7 mm Berezin BS, 2x 7.62 mm ShKAS. Can be easily replaced with 2x 23 mm cannons.
Significant features: Cantilever biplane with no struts and wires. Upper wing is “gull” type, lower is “inverted gull”. The aircraft featured tricycle landing gear, because tail part was occupied by DM ramjet and there were no place for the tailwheel. The ramjet (already tested by Borovkov and Florov on the I-207/3) was used only for short time as a booster. When it wasn’t active, the inlets were closed by special doors.

Borovkov/Florov “Aircraft No.11”
Design date: autumn 1940
Purpose: maneuverable fighter only.
Engine: 1x Shvetsov M-71 (1700/2000 hp); 2x Merkulov DM ramjets
Crew: 1
Wing span: 8.5 m
Length: 7.85 m
Wing area: 22.0 m2
Takeoff weight: 3250 kg
Wing loading: 148 kg/m2
Maximum speed with ramjet active: 750…800 km/h
Climbing to 8000 m (with ramjet active): 6…7 minutes
Flight range: 800 km
Other technical data unknown.
Significant features: It was smaller and lighter derivative of the “10”. Instead of one large DM ramjet, it has two smaller ones placed side-by-side. The “11” was a taildragger back again, and the tailwheel was placed between the two ramjets.


Despite of high proclaimed performance, any of these projects wasn’t supported by both the VVS and NKAP. The common position was that biplanes belong to the past. According to Maslov, when Borovkov discussed his work with Yakovlev the latter said that any biplane will not get support anymore.

Source: Mikhail Maslov "Borovkov and Florov fighters". - Aviatsiya (Aviation) magazine Vol.2 (2/99), p.15-16.

P.S. It’s interesting that, according to Maslov, the DM letters stood not for Dvigatel Merkulova (Merkulov’s engine) but simply for Dopolnitel’nyi Motor (additional motor).
 

Attachments

  • BoF_No10.jpg
    BoF_No10.jpg
    95.1 KB · Views: 777
  • BoF_No11.jpg
    BoF_No11.jpg
    231.2 KB · Views: 767
  • BoF projects_color.jpg
    BoF projects_color.jpg
    170.7 KB · Views: 762

Stargazer2006

ACCESS: USAP
Senior Member
Joined
Jun 25, 2009
Messages
13,227
Reaction score
661
And what about this later 1941 design? What was it called? Was it ever built?
 

Attachments

  • project.jpg
    project.jpg
    202.4 KB · Views: 726

redstar72

Soviet Aviation enthusiast
Senior Member
Joined
Jun 7, 2009
Messages
519
Reaction score
63
It wasn't built, and almost nothing is known about it. Mikhail Maslov found the provisional sketch of it when researching Florov's 1940-41 documents in the archive. Even the designation isn't known.
 

theponja

ACCESS: Secret
Joined
Sep 5, 2007
Messages
428
Reaction score
16
Thanks a lot for the very detailed data redstar72. I wonder why they follow with the biplane. agility, size?
 

Stargazer2006

ACCESS: USAP
Senior Member
Joined
Jun 25, 2009
Messages
13,227
Reaction score
661
More about Aircraft '10', Aircraft '11', Aircraft '7211' and the I-207 in this excellent source on Florov:

Source: http://www.ciam.ru/file/Image/book_qwe_002.pdf
 

Attachments

  • Samolyet '7211'.jpg
    Samolyet '7211'.jpg
    109.2 KB · Views: 91
  • I-207 specs.jpg
    I-207 specs.jpg
    226.8 KB · Views: 80
  • Florov I-207.jpg
    Florov I-207.jpg
    129 KB · Views: 88
  • Samolyet '10' and '11' specs.jpg
    Samolyet '10' and '11' specs.jpg
    120.4 KB · Views: 87
  • Samolyet '10' and '11'.jpg
    Samolyet '10' and '11'.jpg
    129 KB · Views: 412

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
27,790
Reaction score
4,946
Hi,


here is the Borovkov/Florov I-207 with rocket engines,and a drawing to I-207/4.
 

Attachments

  • I-207.png
    I-207.png
    58.5 KB · Views: 65
  • I-207-4.jpg
    I-207-4.jpg
    39.4 KB · Views: 68

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
27,790
Reaction score
4,946
My dear Borovik,

here is its three pages from;

Наша авиация в 1941 году: Причины катастрофы
(Война и мы. Авиаколлекция)
 

Attachments

  • 1.JPG
    1.JPG
    119.7 KB · Views: 59
  • 2.JPG
    2.JPG
    105.6 KB · Views: 69
  • 3.JPG
    3.JPG
    141.3 KB · Views: 72
Last edited:

borovik

ACCESS: Top Secret
Joined
May 5, 2007
Messages
792
Reaction score
140
hesham said:
Hi,


here is the Borovkov/Florov I-207 with rocket engines,and a drawing to I-207/4.

And?
Hesham I know the history of this aircraft ...
Where did you get information about using to them of rocket engines?
 

Attachments

  • I-207.jpg
    I-207.jpg
    1.3 MB · Views: 133

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
27,790
Reaction score
4,946
OK my dear Borovik,


I thought they are a rockets,but they are a weapons right ?.
 

borovik

ACCESS: Top Secret
Joined
May 5, 2007
Messages
792
Reaction score
140
I-207 №11
Maximum calculated speed at an altitude of 5830m without the inclusion of a ramjet (without bomb load) was 654 km / h.
With the use of two additional ramjet engines by Merkulov calculated speed should reach 750 km / h.
(It may be overly optimistic))
 

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
27,790
Reaction score
4,946
borovik said:
I-207 №11
Maximum calculated speed at an altitude of 5830m without the inclusion of a ramjet (without bomb load) was 654 km / h.
With the use of two additional ramjet engines by Merkulov calculated speed should reach 750 km / h.
(It may be overly optimistic))


Good Info my dear Borovik.
 

Similar threads

Top