Flight, January 24, 1914.
THE EULER HYDRO-TRIPLANE.
SINCE Mr. A. V. Roe's experiments with a triplane which was later discarded for machines of the biplane type no successful triplane has, so far as we know, been constructed in this country. It is quite conceivable, however, that in time to come, when greater loads will have to be carried than is the case at present, the triplane type of machine will be revived, for constructional difficulties must of necessity put a limit to the span it is technically advisable to give a machine, and the triplane construction seems to be the easiest solution of the problem of obtaining the required larger lifting surface.
It is no doubt with this end in view, that the Euler hydro-triplane has been designed, and incidentally it is, to the best of our knowledge, the first successful hydro-triplane constructed.
From the accompanying photographs, it will be seen that the three main planes have an increasing span, that of the bottom plane being 8 m., that of the middle plane 10 m., whilst the top plane spans 14 m. The extensions of the uppermost planes can be folded down, thereby reducing the overall span by about 4 m. In order to diminish the interference of the planes without making the gap between them of excessive proportions the planes have been given a very pronounced stagger forward, a system which is finding increased favour with aeroplane designers generally.
The 100 h.p. 9-cylinder Gnome engine is mounted immediately above the centre plane, and is protected against the spray of water by the bottom plane. In order to keep the centre of gravity fairly low, the petrol tank has been placed down in the float or boat - for this machine is really a flying boat, having only one central float. Petrol is forced from this main tank to a small service tank near the engine, by means of compressed air contained in a special air reservoir in the rear part of the boat.
Carried on four tail booms attached to the rear spars of the top and bottom main planes respectively are the tail planes, which consist of a fixed tail plane to the trailing edge of which is hinged the elevator, and of a vertical rudder supported on a framework coming up from the rear part of the boat. This latter member is 7 rn. long and 1 m. wide, and is of the stepped type. The pilot's and passenger's seats are arranged tandem fashion, the pilot occupying the front seat. It will be noticed that in addition to the boat a landing chassis is fitted. When the machine is used on the water the wheels can be raised by the pilot, and lowered again if he desires to alight on land, so that the machine really belongs to the amphibious class of aeroplanes. The landing chassis is sprung by means of rubber shock-absorbers attached to the gunwales of the boat.
Flight, October 16, 1914.
AIRCRAFT "MADE IN GERMANY"
WHICH MAY BE EMPLOYED AGAINST THE ALLIES.
10. The Euler Triplane
is, we believe, the only successful hydro-triplane ever constructed. From the accompanying illustrations it will be seen that the three main planes have an increasing span, that of the bottom plane being 26 ft. 3 ins., that of the middle plane 33 ft., whilst the top plane spans 46 ft. The extensions of the top plane can be folded down, thereby reducing the overall span by about 13 ft. The staggering of the plane, as will be seen from the photographs, is very pronounced.
The 100 h.p. 9-cyl. Gnome engine is mounted immediately above the centre plane, and the lower plane, on account of the stagger, protects it effectively against water spray. Petrol is carried in a large tank placed down in the float or boat, and is forced from this main tank to a service tank near the engine by means of compressed air contained in a special air reservoir in the rear part of the boat.
Carried on four tail booms attached to the rear spars of upper and lower main planes respectively are the tail .planes, which consist of a fixed tail plane to which is hinged the elevator, and of a verticle rudder, supported on a framework coming up from the rear portion of the boat. The latter member, which is of the stepped type, is 23 ft. long and 3 ft. 4 ins. wide. The seats are arranged in tandem, the pilot sitting in front. In addition to the boat a land carriage is fitted, by means of which the machine can be started off land. For use over water the wheels may be raised above the boat, and can be lowered again from the pilot's seat should it be desired to alight on the shore. The landing wheels are sprung by means of rubber shock absorbers attached to the gunwales of the boat.