The M.27 was a two-seater, very similar to the M.23b but with a more rounded fin and rudder assembly, a fuselage stretched by about 1,400 mm  to accommodate luggage and a new, spatted undercarriage. Pilot and passenger sat in tandem in separate open cockpits.
It was successfully raced, winning the Deutschland Competition in 1932 and coming second in the Zugspitz Circuit in1933.

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Two-seater BFW M 27 sports training aircraft.
Dipl.-Ing. Messerschmitt has created a machine with this design that meets the most spoiled demands and also those of the tender for the Deutschlandflug. Raw steel hull, vertical fuselage cutting edge, interrupted elevator, faired wheels, foldable wings and many other wishes are fulfilled.
The cantilevered wing is strongly trapezoidal and rounded at the ends. Particular emphasis is placed on a good aerodynamic transition of the surfaces to the fuselage.
Nose and end ribs are attached to the spar, which is made of plywood with jaw straps in the simplest way. The plywood planking of the wing encloses the wing nose and extends behind the spar to the aileron base, at the height of which a light auxiliary spar forms the end. On both sides of the spar, this creates torsionally rigid closed boxes. Behind the auxiliary spar, the wing tip is covered with aircraft lines, as are the ailerons, which are mounted multiple times in the outer part of the wing. The sashes are attached to both sides with 3 strong fittings each. The connection is made by generously dimensioned bolts made of
chromium-nickel steel.
While the bolt of the upper main surface connection is secured with nut and cotter pin, the lower surface bolt and the bolt of the rear fitting are designed as plug-in bolts. These latter two bolts are connected to each other by a lever transmission in such a way that they can both be pressed into or pulled out of the fittings at the same time by means of a lever operation. This prevents damage to the fittings by the usual driving of the bolts with a hammer and enables the aircraft to be assembled and dismantled by one person without any tools in the shortest possible time. The hull consists of a welded, diagonally braced tubular steel truss and is covered with fabric on the outside.
On the square truss structure, the fuselage back is placed with a triangular cross-section with a strongly rounded top. This design of the back of the fuselage creates excellent visibility conditions for guides and observers, especially during landing. Despite these good visibility, the crew is not bothered by strong draughts.
The seats are so close to each other that good communication and the transfer of objects from one seat to another is ensured. Behind the driver's seat is a luggage compartment of approx. 0.2 m3, accessible from both sides. The seats can be opened to control the steering and the interior of the fuselage. Seated parachutes can be carried as parachutes. This arrangement of the parachute, which is also now required by the authoritative flying schools, has been found to be the most expedient on the basis of years of experience.
There are control lights in the luggage compartment and in the end of the fuselage, and the fabric covering is tied on the underside of the fuselage, which makes it possible to completely expose the inside of the fuselage for major overhauls. The horizontal stabilizer is trapezoidal with rounded corners on the outside. Rudders and fins are made of wood. While the fin is planked with plywood, the rudder is covered with fabric. The height fin is adjusted by a hand crank in the driver's seat. The control is available as a stickand guided to the tail unit by pulleys without pulleys. For school purposes, a removable double control system and a second instrument panel can be installed on request. To switch off the double control, all you have to do is pull out the front stick, which is designed as a plug-in stick, and loosen 2 bolts for the side control pedals. All control organs are easily accessible and controllable. All important bearings of the control system are designed as ball bearings to reduce friction.
The chassis is designed with a split axle raised in the middle. The cushioning is provided by endless rubber rings, which can be replaced individually. The brake wheels used are bal ion wheels made of electro cast iron with inner jaw brakes. It is operated by a handbrake lever in the driver's seat. The brakes can be locked on the ground, so that braking is possible without brake pads. The main connection and pivot bolts as well as the wheels are equipped with grease fittings that allow easy and convenient maintenance. The spur is freely movable on all sides and cushioned with endless rubber rings. Large flaps in the fuselage end ensure good accessibility to the spur wrapping.
Wingspan 12 m, length 7.6 m, height 2 m, wing capacity 14.3 m2, wing load 42 kg/m2, power load 6 kg/m2, engine Argus. As 8 air-cooled, 80/100 hp,
set-up weight 370 kg, operating load 180 kg, crew 80 kg, fuel 100 kg, payload 80 kg, flight weight: 630 kg, maximum speed. 185 km/h, cruising speed b. 15% throttling 150 km/h, landing speed at full load 70 km/h, landing speed. flown out 64 km/h, climbing speed. a. Ground 4.2 m/sec, ascent time at 1000 m in 4.2 min., at 2000 m in 10 min., at 3000 m in 18.5 min., at 4000 m in 28.5 min., summit altitude 5.7, fuel tank
112 1, oil tank 8 1, flight duration at 15% throttle 5.5 h, flight area at 15% throttle 820 km.