That's
less burden of work for the Surface, and so the Spars need
not be so strong and so deep, which results in not so thick
a Surface. That means the Chord can be proportionately
decreased without adversely affecting the Camber. With
the Chord decreased, the Span becomes relatively greater,
and so produces a splendid Aspect Ratio, and an excellent
proportion of Lift to Drift.''
``I don't deny that they have rather got me there,''
said the Drift, ``but all the same, don't forget my increase
due to the drift of the Struts and their bracing wires.''
``Yes, I dare say,'' replied the Surface, ``but remember
that my Spars are less deep than before, and consequently I
am not so thick now, and shall for that reason also be able
to go through the air with a less proportion of Drift to Lift.''
``Remember me also, please,'' croaked the Angle of
Incidence. ``Since the Surface has now less weight to carry
for its area, I may be set at a still lesser and finer Angle.
That means less Drift again. We are certainly getting on
splendidly! Show us how it looks now, Blackboard.'' And
the Blackboard obligingly showed them as follows:
``Well, what do you think of that?'' they all cried to the
Drift.
``You think you are very clever,'' sneered the Drift.
``But you are not helping Efficiency as much as you think.
The suction effect on the top of the lower Surface will give
a downward motion to the air above it and the result will
be that the bottom of the top Surface will not secure as good
a Reaction from the air as would otherwise be the case,
and that means loss of Lift; and you can't help matters
by increasing the gap between the surfaces because that
means longer Struts and Wires, and that in itself would
help me, not to speak of increasing the Weight.
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