Belgium [Data Sheet] Stampe-Vertongen S.V.10 (in work)

[spirou14 522]

Model: Stampe-Vertongen S.V.10
 
Technical Description: Fixed-undercarriage biplane and twin-engined bomber.
 
Visual Aspects: [2]
 











 

 

 

 


Short History:

 

 

 

"In 1934 General Gillieaux issued specifcation for a twin-engined "Flying Cruiser" which was scheduled

to see service with the 3ème Regiment Aéronautique. The aircraft had to be a fixed-undercarriage biplane

manned by a a crew of three. It's span was limited to 18 meters, maximum speed at 4.000 m had to be at

least 350 km/h, whereas landing speed could not exceed 110 km/h. Further instructions pointed out to

fully aerobatic capacities so as to use the new machine as a bomber and a fighter. To crown it all it had

to be fitted with Fokker-VII3m wheels, which the Aé. Mil. possessed in subtantial quantities! The

specification stuck to obsolete theories which larger Air Forces had dropped as early as the mid-1920s,

after a handful of disappointing prototypes had been flight-tested, such as the French Bréguet 41M of

1931. Stampe and Vertongen accepted the challenge and set down to work on their largest project.

 

The R. and D. departement was increased to 14 people, and Ivanow came out with drawings for the S.V.10:

a snub, compact and powerful aircraft. With its twin 780 hp Gnôme radials and elliptic sesquiplane wings,

it was a pleasure to look at, though it was devoid of any originality. It bore very close similarity to the

Boulton Paul P-63 and P-64 as well as to the Bellanca 77-140. Like them, it possessed a very short and

unusually deep and thick fuselage.While the prototype was being assembled, Jean and Leon Stampe

trained on a military twin-engine aircraft. In mid-summer Leon had an arm broken in a car crash near Paris.

It was deplastered only in september.

 

The prototype was crabbed out on 01.10.1935, and taken off on its maiden flight by Jean Stampe. Leon

was entrusted with the second flight which took place on 04.11.1935. On the following day he took off with

Ivanow aboard. Jean Stampe forbade them to test the landing flaps. A few minutes after take off, the

S.V.10 was seen coming back over the airfield at low speed and at about 1.000 feet. All witnesses noticed

that the engines had been throttled back. The large biplane suddenly went into a left spin, recovered,

then got into a right spin down to the ground. Both crewmen were killed (1), and the aircraft was a total wreck.

What had happened was never quite found out. The flaps had not been downed. One theory has it that

Leon may have tried to check out the stalling speed. On reaching it, the S.V.10 flicked left, and its pilot was

surprised by the unusually heavy mass to control. He may also found himself unable to use all his strenght

because of his weaker arm. Other arguments are that the fuselage was too short and that the wings' airflow

blanketed out the tail unit, as had happened with the Boulton Paul. Local historian Armand Van Ishoven

was told by a former S.V. worker that some loose ballast was responsible for the stall. But in 1974 Stampe

and Coppens were positive that the S.V.10 had not been ballasted. A stray spanner is also said to have

blocked the controls. That doesn't seem to be much relevant. After the accident Stampe and Vertongen

decided to drop the S.V.10 programme. B. Demiddoff, a Russian-born engineer who had joined the team,

was entrusted with the technical departement."

 

Reginald Jouhaud in Stampe aircraft.[1; page 95-97]

 

 

 

Configuration:
 

Production Status

 

First flight: 1935

Introduction year: -

Status: Prototype

Number built: 1

 

Crew Data [1; page 90-91]

 

Number of crew: 3
Roles of crew:

- Pilot

- Navigator, front gunner, bomber and photographer

- Back gunner

 

Engine Data
 

Manufacturer: Gnome et Rhône (Fr.) [1; page 90]
Name: 14 Kdrs (780 hp) [1; page 90]
Number of engines: 2 [1; page 90]
Number of cylinders: 14  [1; page 90]

Configuration : Double star [1; page 90]

Cooling: Air-cooled [1; page 90]

Dry weight:

 

 

 

Fuel Data
 

Regular: 600 L [1; page 95]

Maximum: 700 L [1; page 95]

 

 

 

Basic Geometric Data
 

Length: 11 m [1; page 95]

Upper wing span: 18 m [1; page 95]

Lower wing span: 11.60 m [1; page 95]

Wing area: 53 m2  [1; page 95]

Weight Data
 

Empty weight: 4500 kg  [1; page 95]
Bombs weight: 600 kg [1; page 95]

Weight/m2: 85 kg/m2 [1; page 95]

Weight/hp : 3,81Kg/hp [1; page 95]
 
General Performance Data (theoretical)

 

Maximum speed at 4000 m: 350 km/h [1; page 95]

Minimum speed: 110 km/h [1; page 95]

Service ceiling: 8.000 m [1; page 95]

 

 
Armament
 

- Front turret: Two FN-Browning 7,62 mm machine gun [1; page 90-91]

- Back turret: Two FN-Browning 7,62 mm machine gun or one 20 mm machine gun [1; page 90-91]

- Optional : A retractable ventral turret manually with one FN-Browning 7,62 mm machine gun [1; page 90-91]

- 600 Kg of bombs in vertical storage [1; page 90-91]

 

Notes:

 

(1) George Ivanow and Léon Stampe were decorated with the order of Leopold posthumously.

 

 

Sources:

 

1. Stampe aircraft by Reginald Jouhaud (page 89-97).

Published by Wimpel Amsterdam 1993

 

 

 

 

2.  Luchtvaartgeschiedenis.be ( http://www.bahavzw.be/database/content/stampe-vertongen-sv-10-s-25-te-borsbeek-l%C3%A9-stampe-en-georges-ivanow )

 

 

 

Updates:

 

- 27/04/2015 : Additions in notes.

Edited June 20, 2015 by spirou14

[AtlasWH 4,834]

dayum that thing's ugly

 

 

 

 

 

 

 

 

still gib.

[Sabeda 171]

Excellent work, as usual.

[blankfile 372]

Wow i'm amazed you found so much about this plane. This is probably the hardest plane to find data about on the belgian tree is it not?

 

again excellent work!

[spirou14 522]

dayum that thing's ugly

 

 

 

 

 

 

 

 

still gib.

 

Then I'll give a layer !

 

 

Wow i'm amazed you found so much about this plane. This is probably the hardest plane to find data about on the belgian tree is it not?

 

again excellent work!

 

 

Excellent work, as usual.

 

Thanks, but the work is far from finished, there are lots of details to add.

Edited April 27, 2015 by spirou14

[spirou14 522]

Updates:

 

- 27/04/2015 : Additions in notes.

[spirou14 522]

"A BOLD BELGIAN EFFORT" on flightglobal.com :

 

http://www.flightglobal.com/pdfarchive/view/1935/1935%20-%200819.html?search=stampe

[Tarskin 1,496]

I dread the day when I start working on the data sheet for a prototype.... Great work so far however!