Technical Aspects of the 1934 International Touring Competition (Rundflug) Page: 14 of 34
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N.A.C.A. Technical Memorandum No. 760
flight during rough weather. The torque shaft links the
slots .of the two wing halves very, rigidly, thus insuring
even and simultaneous openig and closing at all.... tiias.
This point has frequently proved a source of disturbance
in other airplanes (which, as a rule employed slide-ra1
guidance and rollers, and which resulted in unequal bear-
ing friction, due to poor workmanship). The customary
trailing-edge flap on the inside is linked with the slot-
ted'wing (maximum down movement 450), as are the ailerons
which can be set down in a second neutral position (150).
The lateral control is connected to a Handley Page-
Lachmann interceptor control by means of conventional ai-
lerons. The interceptor becomes effective only aftet. the
slots are open, and in such a way that the interceptor op-
erates only upwardly when the aileron is deflected (fig.
14).* According to preliminary experiments the arrangement
of the interceptor extending as far as the wing tip pro-
duced a sudden loss of damping in roll and suddenly incip-
ient rolling motions. As a result, the interceptor was
shortened about 1 meter from the wing tip over a span dis-
tance of 0.8 .m (2.62 ft.). The combination aileron-inter-
ceptor gave the airplane a remarkable lateral controlla-
bility, especially at high angles of attack. This arrange-
ment is perhaps the most appropriate and practically the
most reliable solution at the present time.
BEW e:i 108.- This airplane presents a remarkable and
novel form of development from the aerodynamic point of
view. It has a full-span, divided slotted wing, The out-
er part, the wing-tip slot, is automatic at any attitude
for the purpose of assuring adequate damping in roll; the
inner part is connected to the landing flap and operated
conjointly by hand wheel from the pilot's seat. The flap,
extending over the span - save for a small strip about 0.3
m wide at the wing tip, which forms the aileron - follows
the basic profile when closed, and simultaneously pushes
rearward with increasing setting (maximum down deflection
310) (fig. 15a) so as to form a slot between wing and land-
ing flap. This increases the wing area by about 1.2 m1, or
A simple locking device prevents the outer slot from
closing more than the inside slot (to prevent sideslip-
ping). The original intention was to use only one later-
al control by means of interceptor located behind the wing
slot, which had proved very satisfactory on another type.
*Pleines, W.: Der Schlitzflkgel. Luftwissen, vol. 1, no.
7, 1934, p. 194.
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Schulz, R. & Pleines, W. Technical Aspects of the 1934 International Touring Competition (Rundflug), report, December 1934; (https://digital.library.unt.edu/ark:/67531/metadc63467/m1/14/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.