Experimental Flights for Testing of a Reactor as an Expedient for the Termination of Dangerous Spins Page: 4 of 20
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NACA TM 1221
represented by figure 1. The rest of the symbols will be discussed only
n (sec-1) the resultant angular velocity about the spin axis
-1sec the angular-velocity components fixed in aircraft, positive
ay s for rotation to the right
the components of the resultant air-force acceleration
b (m/sec) fixed in aircraft, positive in the direction of the
ws (m/sec) rate of descent
R (m) spin radius
v (m/sec) resultant velocity
- spin coefficient
The tests are performed in a left spin. Then one has for the signs:
CD1 (y Wz2
<0 0 <D <D
For the coupling angles the pitch is always negative. If the bank
becomes negative, it signifies an inward trimming. A positive angle of
sideslip corresponds to the inward skidding favorable for spin recovery.
3. TEST METHOD
For the determination of the coupling angles and other important
characteristics of the spinning airplane it is necessary to measure the
variation with time of the quantities necessary for the evaulation method.
For this investigation the determination of the angular-velocity and
acceleration components fixed in the aircraft and of the rate of drop
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Hoehler, P. & Koeppen, I. v. Experimental Flights for Testing of a Reactor as an Expedient for the Termination of Dangerous Spins, report, July 1, 1949; (digital.library.unt.edu/ark:/67531/metadc64981/m1/4/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.