Aerodynamics of the Fuselage Page: 2 of 47
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TECH LIBRARY KAPB, NM
1B 01944779
46 NATIONAL ADYISORT OOMUITTn.FOR AZONAUIOS
T 3IN OAL ZMORAIDUK NO. 1036
AURODYNAMIOS OFY TE USfLAB~*
Byf H. Multh'opp
SUMMARY
The present report deals with a number of problems,
particularly with the interactibn of the fuselage with
the wing and tail, on th& basis of simple calculating
methods derived from greatly idealized concepts.
For the fuselage alone it affords, in variance with
potential theory, a certain frictiona lift in yawed flow,
which, similar to the lift of a wing of small aspect ratio,
is no longer linearly related. to the angle of attack.
Nevertheless there exists for this frictional lift some-
thing like a neutral stability point the position of which
on oblong fuselages appears to be associated with the lift
0 increase of the fuselage in proximity to the zero lift,
according to the present experiments.
The pitching moments of the fuselage can be deter-
mined with comparatively great reliability so far as the
flow conditions in the neighborhood of the axis of the
fuselage can be approximated if the fuselage were absent,
which, in general, is not very difficult.
For the unstable contribution of the fuselage to the
static longitudinal stability of the airplane it affords
comparatively simple formulas, the evaluation of which
offers little difficulty. On the -ngine nacelles there is,
in addition a very substantial wing moment contribution
induced by the nonuniform distribution of the transverse
displacement flow of the nacelle along the wing chord;
this also can be representedL by a simple formul. A check
on a large number of dissimilar aircraft types regarding
the unstable fuselage and nacelle moments disclosed an
agreement with the wind-tunnel tests, which should be suf-
ficient for practical requirements. The errors remained
throughout within the scope of instrumental accuracy.
*"Zur Aerodynamik des Tlugzeugrumpfes.A Luftfahrtforechung,
vol. 18, nos. 2-3, March 29, 1941, pp. 52-56.
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Multhopp, H. Aerodynamics of the Fuselage, report, December 1942; (https://digital.library.unt.edu/ark:/67531/metadc63732/m1/2/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.