One Lap Landing Approach

[Peter G]

Dear Friends,

while working on the "rate of descent" issue a number of contributions
related to the need of the lenght of the landing appoach have been
made. As this seems to be a subject of great interest. the opening of
a related discussion is definitely apprpriate.Here the description of
the Landing Manoeuvre, as it will in rule from Jan.1st. 2011 in
(Provided that it will be approvedby the 2010 Plenary Meeting)

4.2.15.17 Landing Manoeuvre

Recommended entry procedure: The manoeuvre is entered from normal
upright level flight at the height of the base.

a) Start of manoeuvre:
As the model aircraft leaves level flight at the height of the base
(+/- 30 cm) and with the motor/s and propeller/s stopped.

Note: For the purpose of this rule, the word “stopped” describes a
situation where the blades of the propeller(s) are actually at a
standstill or are rotating so slowly that the individual blades can
clearly be seen by an observer.

b) The descent segment:
The model should fly for 1 full gliding lap with the motor/s and
propeller/s stopped. This lap is measured from the start of the
descent from the height of the base (+/- 30cm) until the point of
touchdown. The rate of descent should remain constant throughout the
whole gliding lap, from the moment that the model aircraft leaves the
base height until the moment it touches down. The touch down itself
should be smooth and either a “2 point” or a “3 point” touch down
shall be judged as equally correct.

c) End of manoeuvre:
The manoeuvre is complete when the model aircraft comes to a complete
stop after touching down at the end of the ground roll which is
clearly in a forwards direction and in line with its normal flight
motion. The length of the ground roll shall not exceed one lap.

I am looking forward to your contributions and reasoning wether to
change the Landing. Manoeuvre or not.

Kind regards, Peter

[go_s...@comcast.net]

This is one issue I have always had with the FAI landing.

 

How can the judges tell where the decent starts, and the one lap ends when the landing starts in level flight? The decent slope is so gradual, it is IMPOSSIBLE to tell when it starts. If you can't tell where it starts, how do you know when one lap is?  You can't.  This leaves it up to the judges interpretation.  Isn't that what we are supposed to be fixing here?  Removing judgement calls like this and putting quantifiable measures in place. 

 

If the landing were to start at 10 meters high (for instance), then the transition to the glide slope is noticeable, and can be measured, and graded accordingly.

 

The remainder of the description looks acceptable to me.

 

Paul Walker

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[Igor Burger]

Paul, it is very simple :-)

 

Level flight has +/- 30 cm legal boundaries and judges should allow 1 lap from any of them. That is because pilot is that one who decides what is the altitude where he starts landing. Means judges must allow one lap plus/minus 0,3/1,5=0.2 = 20% of lap. 

 

The judge must do little bit difficult, but still doable task. He will either recognize start point of the landing and then allow +/- 20% of lap (that is the simpler way), and if not, he must find the point where model crosses lowest legal altitude for level (1,2m), and that is latest point where model started landing for sure, and he must land latest 1 lap from that point, but still can land 40% of lap earlier, optimally it is 20% earlier.

 

igor

 

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From: f2b-...@googlegroups.com [mailto:f2b-...@googlegroups.com] On Behalf Of go_s...@comcast.net
Sent: 23. marca 2010 19:52
To: f2b-...@googlegroups.com
Subject: Re: One Lap Landing Approach