Page 20 - PDF-Sample
P. 20
Chapter-5 Stalls and Spins-V20_Sport Pilot Handbook 8/30/2021 5:57 PM Page 51
Chapter 5: Stalls and Spins 5-51
Entering a Spin to the Right The airplane’s autorotation in a spin results from the un-
equal angle of attack on each wing. The descending (inside)
wing has exceeded its critical angle of attack, but the rising
(outside) wing is not quite as stalled (Figure 58). Why
would one wing stall ahead of the other?
We’ve discussed several scenarios in which
lack of coordinated flight can cause one wing
to stall before the other. To spin, the airplane
1
Airplane must must first be stalled in either a skidding or
stall to spin 3 A right skidding turn slipping condition, with the skid being the
stalls the right wing easiest way to induce the spin. No stall, no
2 first, airplane enters
Add full spin to the right spin. So sorry. You can’t spin if you don’t
right rudder stall first. Do NOT forget this point! Avoid
at moment
of stall the stall and you’ll avoid the spin. See how
4
Airspeed important stall recognition is?
constant
For example, if you raise the nose to stall
the airplane, hold the wings level with
aileron, and then apply right rudder just
as the airplane is about to stall (i.e., is
near its critical angle of attack), you’ll in-
duce a downward and rearward motion on
Fig. 59 the right wing and an upward and forward
motion on the left (Figure 59). The right wing’s
Entering a Spin to the Left angle of attack increases beyond its critical
value and stalls, while the left wing’s
A spin to the left is performed in angle of attack is near its critical value
a similar manner as a spin to the
right, except that full left rudder is and isn’t stalled as much. The airplane
applied at the moment of stall. If, enters a spin to the right, in the same di-
however, you are using power
the airplane’s left rection you applied the rudder.
turning tendency On the other hand (or foot), if you raise
will produce nearly the
same effect of adding the nose to stall the airplane while hold-
full left rudder at the ing the wings level and apply full left
moment of stall.
rudder at the moment of stall, the air-
plane enters a spin to the left (Figure
60). Left rudder induces a left yaw and
a left roll, which moves the left wing
downward and rearward, increasing the
left wing’s angle of attack beyond its
critical value. The right wing, by de-
fault, moves upward and forward,
which reduces its angle of attack. The
net result is that the airplane enters a
spin to the left.
It’s instructive to note that you can also enter a
spin to the left without purposely applying left rudder, as
long as you stall with power applied. The airplane’s power-
Fig. 60 induced left turning tendency substitutes for the rudder
