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contest number question



 
 
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  #21  
Old February 7th 18, 07:26 PM posted to rec.aviation.soaring
CindyB[_2_]
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Posts: 157
Default contest number question

On Friday, February 2, 2018 at 7:53:56 PM UTC-8, Tim Taylor wrote:
6.2.2 The Contest ID shall be displayed in a contrasting color on both sides of the vertical tail (minimum height 12 inches) and
under the right wing (bottom of ID toward the trailing edge of the wing; minimum height is the smaller of 24 inches or 90% of the
wing chord excluding a control surface).



For the newbies - we don't put dark (contrasting) colors on the top of wings due to the potential overheating of that area of fiberglass. That's a manufacturer restriction/guidance. This is why you only see "anti-collision" markings on tips and rudders. When we have enough pilots flying inverted for long periods, then we can talk about eliminating under-wing markings.... For the folks who use soft grey numbers - silly. Useless.

For temporary numbers at a comp, use dark blue or black electrical tape. Easy on, easy off. Seems a just punishment for the silly ones who wanted to go 'stealth'. They'll be all noodled up over the loss of performance....

Cindy B
  #22  
Old February 8th 18, 07:11 PM posted to rec.aviation.soaring
Jamie Shore
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Posts: 40
Default contest number question

The IGC rules changed between 2015 and 2016 regarding the wing contest number requirements.

2015 IGC Rule 4.3.1
4.3.1 The contest numbers, as validated by the Organisers, shall be displayed:
a. On the underside of the right wing, approximately 2.5 m from the centreline of
the sailplane with the top of the figures or letters towards the wing leading
edge. The height of the letters or figures should be not less than
approximately 80% of the wing chord.
b. On both sides of the tail fin and/or rudder. These must be at least 30 cm
high.
c. On the glider trailer and crew car.

2016 IGC Rule
4.3.1 The contest numbers, as validated by the Organisers, shall be displayed:
a. On both sides of the tail fin and/or rudder. These should be at least 30 cm
high.
b. On the glider trailer and crew car.

Link to the the IGC 2017 Rules
https://www.fai.org/sites/default/files/sc3a_2017b.pdf

Jamie Shore
  #23  
Old February 9th 18, 05:15 PM posted to rec.aviation.soaring
Steve Koerner
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Posts: 430
Default contest number question

Nobody has pointed out that markings in general and especially big markings on the wing have a serious downside related to servicing the finish.

As far as getting an ID for radio communication, that doesn't really happen very much and the tail marking is far more useful for that particular purpose anyway. PowerFlarm provides a good way to get a nearby contest number as well.

The US should certainly adopt this IGC standard. Thanks for pointing that out Jamie.
 




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