Canard
A canard (French for duck) is a type of fixed wing aircraft in which the tailplane is ahead of the main lifting surfaces, rather than behind them as in conventional aircraft. The layout has advantages and disadvantages:
Advantages
The canard surface normally produces positive (upwards) lift whereas a conventional tailplane normally produces a downforce.
Careful design of a canard aircraft can make it effectively "stall-proof" - the canard surface stalls first which tends to pitch the nose down and prevent the main wing from stalling.
Canard designs can sometimes have a more useful range of centre of gravity.
Disadvantages
The wing operates in the downwash from the canard surface, which reduces its efficiency
It is often difficult to apply flaps to the wing in a canard design. Deploying flaps causes a large nose-down pitching moment, but in a conventional aeroplane this effect is considerably reduced by the increased downwash on the tailplane which produces a restoring nose-up pitching moment. With a canard design there is no tailplane to alleviate this effect. The Beech Starship attempted to overcome this problem with a swing-wing canard surface which swept forwards to counteract the effect of deploying flaps, but many canard designs have no flaps at all.
In order to achieve longitudinal stability, most canard designs feature a small canard surface operating at a high lift coefficient (CL), while the main wing, although much larger, operates at a much smaller CL and never achieves its full lift potential.
A canard is another term for a hoax.
adjust itself to the manners and maxims of the times. In conclusion,
between the Huguenots and the Flemish Protestants. Let us beware of
Catholics towards them, lest they should play the Huguenots against us,
war."
[No one need wonder, says Burgundias (a vehement stickler for the
this prince evinced so much acquaintance with philosophy; he had
Hopper, 72. Strada, 123,124.]
It was, perhaps, not so much the irresistible truth of his arguments,
rather the ruinous state of the military resources, and the exhaustion
which recommended an appeal to the force of arms that the Prince of
to his representations. In order.html">order to avert at first the violence of the
in a better sate of preparation, it was agreed that a portion of the
mitigate the penal statutes of the Emperor, as he himself would
--and as, indeed, he had once shown under circumstances very similar to
do. The Inquisition was not to be introduced in any place where it did
system, or even be entirely suspended, especially since the inquisitors
reason was put prominently forward, in order to deprive the Protestants
own power, or to the justice of their demands. The privy council was
prepared the confederates were awaited.
THE GUEUX.
The members of the senate had not yet dispersed, when all Brussels
town. They consisted of no more than two hundred horse, but rumor
regent consulted with her ministers whether it was best to close the
suggestions were rejected as dishonorable; and the peaceable entry of
their arrival they assembled at Kuilemberg house, where Brederode
.
On
wordlookup.net
All is still licensed under the GNU FDL.
It uses material from the wikipedia.
|
|