[NSRCA-discussion] Could this allow automated scoring?

[Keith Hoard]

Here is a 10Hz update rate GPS <http://www.adafruit.com/product/746> 

 

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On
Behalf Of John Gayer via NSRCA-discussion
Sent: Friday, May 8, 2015 10:34 PM
To: Peter Vogel; General pattern discussion
Subject: Re: [NSRCA-discussion] Could this allow automated scoring?

 

The judges are expected to consider the track of the plane in an earth
coordinate system. For example the judges are supposed to consider that a 45
degree climb appears steeper at the end of the box than it does in the
center. So the track should be analyzed by the judges in an earth coordinate
system and the track of the model rather than attitude. 

The location of the pilot is actually irrelevant but the location of the box
is clearly of critical importance. Knowing the actual location of the plane
with a fairly quick update rate is critical. At 120 feet/sec(approx 80 mph),
horizontal position is no problem. At this speed you need an update rate of
about 80 milliseconds to get a data point about every 10 feet. Not sure how
good the GPS update rates are these days but this should be achievable. IF
the altitude update rate is too slow then augment with an altimeter. Since
we are downloading this data from the model, roll attitude could be
transmitted as well for wings level.

We would still need a zero judge for snaps, spins and stall turns and to
establish when the pilot is lost in a maneuver. It might be necessary to
have an "advance to the next maneuver" switch for that case.

It would actually be a fascinating project to download accelerations, roll,
yaw and pitch rates for analysis while observing snaps visually to see if
standards could be established about what is a snap and what isn't.

John

On 5/8/2015 1:24 PM, Peter Vogel via NSRCA-discussion wrote:

Not by itself.  Judging/Scoring is from the perspective of the pilot +
judges, not from the perspective of the plane.  (As opposed to IAC, where
it's from the perspective of the pilot in the plane).  For it to be done
right you'd need to know the precise location of the plane and the precise
location of the pilot, then calculate the geometry of the plane's movements
relative to the perspective of the pilot's location.   

 

The SoloShot 2 automatic cameraman does close to what we want in tracking
the movement of the plane relative to a ground station, but from that you'd
still need to calculate geometries, and wings level, etc.

 

Peter+

 

On Fri, May 8, 2015 at 11:44 AM, Keith Hoard via NSRCA-discussion
<nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org>
> wrote:

Cheap, Centimeter accuracy GPS <http://goo.gl/mZg6RG> .

 

No more complaints about biased judging?

 

-Keith Hoard

klhoard at hotmail.com <mailto:klhoard at hotmail.com> 

 


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