The Effect of a Gap Between Elevator and Stabilizer on the Static Stability and Maneuverability About the Lateral Axis in Flight Page: 2 of 10
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3 1176 01437 3675
NATIONAL ADVIORY.. COMMITTEE FOR AERONAUTICS
TECHNICAL MEMORANDUM NO. 701
TEE EFFECT OF A GAP BETWEEN ELEVATOR AND STABILIZER
ON THE STATIC STABILITY AND MANEUVERABILITY
ABOUT THE LATERAL AXIS IN FLIGHT*
By Walter Hubner
A number, of German airplane types have a gap between
elevator and stabilizer. The effect of this open space
is not generally known, although English wind-tunnel ex-
periments** have shown that even a very small gap exerts
a profound influence on the elevator action. The purpose
of the present free-flight measurements is to ascertain
whether fairing over the gap would actually result in an
The airplane selected was a Heinkel HD-32 having the
following general characteristics (fig. 1):
Siemens SE 12, 112 hp
Propeller: Schwarz No. 27068
H = 2.3 m (7.55 ft.)
D = 2.6 " (8.53 " )
Span, upper wing
Span, lower wing
*"Flugmressungen %ber den Einfluss eines Spaltes zwischen
Hoienruder und -flosse auf die statische Stabilit=t und
Steuerbarkeit um die Querachse." Z.F.M., June 14, 1932,
**Bryant, L. W., and Batson, A. S.: Pressure Distribution
Over the Tailplane of E.3.2C. Part I. R.& M. No. 661,
British A.C.A., 1919.
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Hübner, Walter. The Effect of a Gap Between Elevator and Stabilizer on the Static Stability and Maneuverability About the Lateral Axis in Flight, report, March 1933; (digital.library.unt.edu/ark:/67531/metadc63551/m1/2/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.