<DOC>
<DOCNO>
520
</DOCNO>
<TITLE>
wing-tail interference as a cause of 'magnus' effects
on a finned missile .
</TITLE>
<AUTHOR>
benton,e.r.
</AUTHOR>
<BIBLIO>
j. ae. scs. 29, 1962, 1358.
</BIBLIO>
<TEXT>
  wing-tail interference is shown to cause large /magnus/ effects
on a finned missile whose wings are deflected into an aileron
setting .  a simple experimental method with water as the working
medium is used to obtain low-speed magnus data on a rolling
missile .  the missile is a slender cruciform configuration with
all-movable wings and fixed tail fins .  magnus data are presented
for angles of attack up to 15 and for the one (high) roll
rate which accompanies a 30 aileron deflection angle of the
wings .  tests conducted at zero roll rate but with the wing deflection
maintained, revealed large forces in the magnus direction,
thereby providing the basis for understanding magnus effects due
to wing-tail interference .
  a semiempirical theory is proposed to explain the experimental
data .  a simplified model of the wake behind the wings is introduced
to predict tail-interference factors .  good agreement with
the data is obtained .
  this magnus effect is opposite in direction to the classical
magnus lift on a spinning cylinder ,. it is much larger than either
that effect or the one on a missile with only one set of fins .  wingtail
interference is the predominant source of the effect ,. roll rate
only modifies the basic interference mechanism .
</TEXT>
</DOC>
