[NSRCA-discussion] basic judging question

[Bill's Email]

Woodward, Jim (US SSA) wrote:
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> However, this dovetails into the recent IMAC & Pattern comparison 
> threads.  In IMAC, the plane is supposed to be brought into the 
> "vertical plane" prior to the stall-turn(pivot) taking place.  This is 
> mostly evident if you are flying in a strong headwind where you are 
> wind correcting the vertical line.  Just prior to the stall turn, the 
> pilot hast to pitch the plane into the vertical plane, then yaw around 
> the pivot, then return to the wind corrected down line.
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 Not sure where you got this about IMAC, but it is incorrect. This may 
be the cause of your confusion (from Rule 8.5):

The wings must remain in the vertical geometric plane throughout the 
turnaround, and the aircraft's attitude before and after the turnaround 
must be absolutely vertical (unless wind correction is required), with 
no extraneous tail movement. There must be no rotation around the pitch 
or roll axis. If there is movement around any axis other than the yaw 
axis, often referred as "torquing" (Fig. 25), there is a deduction of 
0.5 points per 5 degrees of axis.

At no time in IMAC is the actual attitude of the plane judged, it is 
ALWAYS the track of the theoretical center of mass. You are not required 
to alter the pitch of the plane at the point if the rotation starts if 
the pitch attitude in not vertical due to wind correction.



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