Piaggio P.7
1929
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Piaggio P.7

A truly remarkable design, the Piaggio P.7 or Piaggio-Pegna P.c.7 was built for the 1929 Schneider Trophy contest. A cantilever high-wing monoplane with long slender fuselage, it had twin hydrofoils instead of floats and was intended to float with the wing resting on the surface of the water. While water-borne it was to be driven by an ordinary marine propeller connected by a shaft and clutch to the rear of the 723kW Isotta Fraschini Special V.6 engine. Once sufficient speed had been attained to lift the aircraft on to the hydrofoils and the normal tractor propeller was clear of the water, this latter propeller would be clutched-in, the marine propeller disengaged, and a conventional take-off would follow.

In practice, problems with the respective clutches prevented the P.c.7 from ever taking off, and although water trials were conducted on Lake Garda by Dal Molin of the Italian Schneider team, the construction of a second aircraft was abandoned.


Specification 
 ENGINE1 x Isotta-Fraschini Special, 723kW
 WEIGHTS
    Take-off weight1738 kg3832 lb
 DIMENSIONS
    Wingspan6.76 m22 ft 2 in
 PERFORMANCE
    Max. speed580 km/h360 mph

Comments
Bill Hauprich, 21.10.2011

Turns out a modeler in Italy made a RC of this aircraft. The Piaggio factory in Finale, made all the data that they had avalible to him, includung the hydrofoil design.
Turns out he had the same trouble attaining takeoff , He found either the hydrofoil design or angle of incidence was wrong.
Afer correction the models flight performance was perfect.

Great wind tunnel at the Piaggio factory.

Uyraell Sensenmann, 29.06.2011

A three-view drawing of this aircraft would be very interesting to see.
It would make for an interesting model.

Aero-Fox, 26.03.2008

A trult remarkable design...I wonder how it would have flown if tests had progressed thar far...

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