The plane  was an enlarged model of the CLE II with a wing mounted higher than the CLE II. In front of the wing was an open cockpit for the pilot. Under and behind the wing was a cabin for eight passengers. Landinggear  was designed with a transverse shaft mounted tight against the fuselage , with two large wheels on side off uselage. The rear fuselage  was supported with a tail skid mounted under the fin. A Daimler D  IV engine with a two-bladed propeller which drives an tobladbærende propeller , later replaced with a Maybach Mb IVa.

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Caspar commercial aircraft type CLE 12.
Modern air traffic places high demands on the profitability of a commercial aircraft. Economy in this sense means that an aircraft with the lowest possible horsepower carries a large load over a long distance at the highest possible speed. The modern commercial aircraft should be kept simple and clear in terms of design, so that it can also be treated by auxiliary staff who do not yet have sufficient experience in this field. The whole structure is therefore arranged purposefully and yet advantageously. The entire engine system should be easy to dismantle and accessible n order to enable any necessary repairs to be carried out in the shortest possible time. The arrangement of the passenger compartment is to be chosen in such a way that any weight displacements do not have any noticeable disadvantages on the torque compensation of the aircraft. The entire arrangement of all technical details is intended to ensure the greatest reliability and operational safety.
The new Caspar airliner, whose designer is 1 "iplorii engineer E. von LÖßl", was designed taking into account the above-mentioned characteristics
To achieve an equally good field of vision for driver and passengers, this type is echoed as a high-wing aircraft. In this type of construction, an extraordinarily
high static longitudinal and lateral stabilisation is achieved due to the favourable implication position. The experience of the latest aerodynamic research has been taken into account to the greatest extent in the formation of the form by avoiding all external, non-load-bearing parts. Therefore, the forehead resistance is brought to a minimum and benefits the performance by making full use of the motor power. The supporting deck, which is completely planked with plywood, is connected to the hull by Bald ach iu struts. The wing deck also has an extremely favorable side ratio. The span is 20 m. To simplify assembly and disassembly and to be able to accommodate the
machine in smaller halls, the wing is designed as a split wing with so-called "plug-in wings". The wing consists of a middle piece of 10 m wingspan, which has a continuous rib profile for the purpose of simplifying production, as well as a plug-in wing of 5 in length each connected on both sides, which is held at the aileron dividing joint by means of a buckle located on the front and rear spars. The Caspar godfather orders from two insertion plates with upper and lower keyway located at the honing ends, which are
brought to the same position by sliding into each other. The connection is made by two wedge pieces, which are mounted on a bolt and pressed into the keyway by a spiral spring. The securing is done by a wing nut. All forces are absorbed only by the steel wedge and not by the HYPERLINK "http://Hol7.cn". This construction is
to be regarded as exemplary due to its simplicity and extremely high safety. The installation of a plug-in wing ice can be done in the short time of about 15 sec. The torsion cables are easily accessible through a flap located next to the aileron separation joint and are released by a simple slip hook when the plug-in wings are dismantled. By means of double ailerons and adjustable altitude damping surface, both of which are operated by separate, self-locking handwheels in the outer area, a transverse and
longitudinal trim protection has been created. The wing is cantilevered throughout and carries a truss of
tubular steel attached to the front and rear spars in the middle, on which the fuselage is suspended. The entire flight load, i.e. engine,
fuel and occupants, is lurking on a bridge in steel and puralnmiu construction, which in turn is suspended from the wing by means of a statically determinable steel tube compartment accessible to calculation
Due to this construction, all large loads are conducted only by metal, while the holz construction serves only as a support for the planking and cladding, as well as for the transmission of only subordinate or only intermittent stresses. Th e empennage is self-supporting in order to reduce its own standing position. The passenger compartment is located under the supporting deck and is kept large enough to allow upright walking comfortably. The entrance doors, which are installed on both sides, are about 75 cm above the ground. The passenger raiini can comfortably accommodate 8 passengers. The interior design can be considered luxurious in every respect. Cabin 1st and 2nd class,
electric ceiling lighting, hot air heating, as well as a W. C increase the comfort. Large windows made of shatterproof triplex glass allow very good visibility. The
handler is located in front of the carrying deck. In order to reduce air resistance, the chassis is located in a profiled fairing, which
also has a load-bearing effect. Next to the guide is a second seat, which is intended for the accompanying fitter or as an emergency seat. Behind the
passenger cabin is the easily accessible luggage compartment.
A 260 hp Maybach or 360 hp Rolls-Royce engine is used for propulsion. The engine is mounted on a steel chassis, which is adjustable to be suitable for the
installation of both engines. The engine chassis, braced by two bridges, is held in place by a tubular steel construction extending
from two points on both sides. The engine cowling and cooling engine are also based on a tubular steel construction.
The main data for the Caspar-üß commercial aircraft type CLE 12 are as follows: length over all: 11 250 in, maximum wingspan: 20 m, maximum height: 3.5 in. Engine
260 hp Maybach, 360 hp Rolls-Royce, curb weight: 1750 kg, speed: 160 km per hour, climbing ability: 1000 in in 9 min., summit altitude: 4000m.