Besson MB.35
# Besson MB.35

The Besson MB.35 Passe Partout was a French two-seat spotter and observation floatplane, designed by Besson. It was intended to serve on Surcouf a very large (for its day) submarine, stowed in a sealed hangar. The first aircraft was destroyed during trials and the second was converted to the MB.41, prototype of the Besson MB.411, which did serve on Surcouf.

## Operators

### France

* French Navy

## Specification (MB.35)

Data from Jane's all the World's Aircraft 1928, Biplanes, Triplanes, and Seaplanes, Submarines with wings : the past, present and future of aircraft-carrying submarines

General characteristics

* Crew: 2
* Length: 7.3 m (23 ft 11 in) wings spread
* Wingspan: 9.85 m (32 ft 4 in) wings spread
* Width: 2.2 m (7 ft 3 in) wings folded for submarine stowage
* Length folded: 6.5 m (21 ft)
* Height: 2.53 m (8 ft 4 in)
* Wing area: 16.5 $m^2$ (178 sq ft)
* Empty weight: 540 kg (1,190 lb)
* Gross weight: 765 kg (1,687 lb)
* Powerplant: 1 × Salmson 9AC 9-cylinder air-cooled radial piston engine, 89 kW (120 hp)
* Propellers: 2-bladed fixed pitch propeller

Performance

* Maximum speed: 160 km/h (99 mph, 86 kn)
* Range: 346 km (215 mi, 187 nmi)
* Ferry range: 644 km (400 mi, 348 nmi) with overload tank in rear cockpit
* Service ceiling: 4,800 m (15,700 ft)
* Wing loading: 47.5 $kg/m^2$ (9.7 lb/sq ft)
* Power/mass: 0.1174 kW/kg (.0714 hp/lb)
