L.Opdyke French Aeroplanes Before the Great War (Schiffer)
Deleted by request of (c)Schiffer Publishing
Bonamy
The single Bonamy aeroplane was entered in the Concours de Securite of 1914, promising perfect stability even with the engine not running. It was built from a Ponnier (Hanriot Type D) fuselage, and had 2 pairs of wings in tandem, with greater dihedral on the forward wing, and sweepback on the rear wing. Each wing had 2 spars, the front fixed and the rear pivoted at a rib at mid-span: with the engine on, the forced draft raised the rear spar at the inner ends so that the tips were lowered and incidence at the wingtips increased. The difference at the tips was from 4° to 10°. The machine flew with a rotary engine, type unknown.
It is likely that Bonamy's design was based on a misinterpretation of Ferber's theory of the three Vs on aircraft stability: the 1st V was positive dihedral; the 2d V was sweepback on the mainplanes; the third V was positive incidence on the mainplane, negative incidence on the tailplane.
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Форум Breguet's Aircraft Challenge
Bonamy's airplane was built in Poignet's factory of Reims.
The wings were fixed to a Poignet fuselage.
The weight of the plane was around 640-650 kg (1410 - 1430 lb)
It did its first flight the 31st of january 1914 on the aerodrome of Reims.
Bielovucie was the pilote, Bonamy was onboard as passenger.
Other flights were done the same day with Vedrine and Alfred Poignet.
Bonamy's airplane was powered with a 70 hp Gnome. During the test the speed was about 100-105 km/h.
This is the unique Bonamy aeroplane which was entered in the Concours de Securite of 1914. The two tandem wings were different as the front wing had a greater dihedral and the rear wing had sweepback. Little (or next to nothing) is known about the machine, but it did fly evidenced by a picture.
Possibly the French magazines (L'Aerophile) of the time reporting on the Concours de Securite of 1914 have written something or at least noticed the machine.
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