[NSRCA-discussion] A question for the experts

[Dave Lockhart]

Matt,

If you are judging by the rules, your answer must be different for FAI -

5B.8 WIND CORRECTION
All manoeuvres are required to be wind corrected in such a way that the
shape of the maneouvre as described in Annex 5A.  is preserved in the model
aircraft's flight.  The exceptions to this grading criterion are in the
stall turns, and spins, where the model is in a stalled condition.

My opinion is that the AMA book should be updated to be consistent with the
FAI book on this topic, and the FAI book is clearly better suited to the
real world dynamics of stall turns in windy conditions.

To answer Don's original question -
For AMA, by the book, - the maneuver is downgraded for drift.
For FAI, by the book, - the maneuver is not downgraded for drift.

Regards,

Dave Lockhart



-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
mjfrederick at cox.net
Sent: Friday, May 27, 2011 8:53 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] A question for the experts

I'm not sure where the notion came from that wind drift during a stall turn
is not downgraded. In AMA judging criteria the only maneuver that
specifically mentions that no downgrade is given for wind drift is the spin,
and that is only DURING the stalled portion of the maneuver. In a "stall"
turn there is no true stall of the wing as there is in a spin. If flown with
the proper wind corrections on the up- and down-lines there should be no
noticable deviation in distance. If there is, the maneuver should be
downgraded because the pilot failed to make the proper wind correction. Even
if there was a slight drift during the 180 turn at the apex of the lines,
the pilot should recognize that and incorporate the proper adjustment to the
downline to bring the aircraft back to the original starting distance. To
me, it's no different than turbulence that might cause the aircraft to
temporarily deviate from straight and level flight. Adjustments must be made
to return the airplane to th  e original line. I don't feel like pulling up
the FAI rule book, so I just won't go there, but I'm not sure if my answer
would be any different.

Matt


---- tocdon at netscape.net wrote: 

A question for the judging experts.

Figure M, both Masters and FAI- Yes I know the bottom line rule the best
presentation gets the best score, but a technical question.

Maneuver flow  in a crosswind.  Plane starts maneuver at 140 meters distance
out.  During the first stall turn the plane drifts out (recall this is a
stalled maneuver); second stall turn the plane drifts out again (same).  Now
the plane wind corrects in all other aspects of the maneuver but exits
approximately 20 meters further out than the entry and no defects observed,
but exit distance is 160 meters.  What is the score given for this maneuver?

Best Regards,

Don

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