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Extra Wing Extension. What Is It For (photo)  
User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Posted (7 years 11 months 4 days 18 hours ago) and read 4596 times:

What is that extension on the trailing edge on the Extras for?



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Photo © Stéphane Champin



6 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17015 posts, RR: 67
Reply 1, posted (7 years 11 months 4 days 18 hours ago) and read 4579 times:

The long flat thing is the aileron. It's slightly deflected downwards, giving the illusion of an extension. The little antennalike structure on the trailing edge tip is a visual aid for aerobatics.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineMDorBust From , joined Dec 1969, posts, RR:
Reply 2, posted (7 years 11 months 4 days 18 hours ago) and read 4579 times:

I was once told that the metal extending from the trailing edge is for aerobatic pilots to use as a horizon referance while conducting manuvers.

User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 3, posted (7 years 11 months 4 days 18 hours ago) and read 4569 times:

The extension is used as a tool to measure 90º and 45º angles with references to the horizon. Basically, aerobatic pilots, such as Patty Wagstaff, use these devices when they are "maneuvering" (as in stunts).

Quote:
Each wingtip has a sighting device to aid in precision maneuvering.

http://www.nasm.si.edu/research/aero/aircraft/extra260.htm


User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 4, posted (7 years 11 months 4 days 18 hours ago) and read 4561 times:

Quoting N231YE (Reply 3):
The extension is used as a tool to measure 90º and 45º angles with references to the horizon

Thats what I was looking for. After hearing it explained it makes perfect sense. Or should I say er type reading it explained.


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 5, posted (7 years 11 months 3 days 22 hours ago) and read 4343 times:

Quoting N231YE (Reply 3):

The extension is used as a tool to measure 90º and 45º angles with references to the horizon.

How would that be carried out.
regds
MEL



Think of the brighter side!
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 6, posted (7 years 11 months 3 days 20 hours ago) and read 4318 times:
AIRLINERS.NET CREW
DATABASE EDITOR




Quoting HAWK21M (Reply 5):
How would that be carried out.

The pilot simply looks to the side, out at the wingtip device, and can align either the 45 or 90 degree bar (and thus, the fuselage) with the horizon. One of the problems with the device is that, on hazy days with no discernable horizon, there is no point of reference, and the device is useless.




2H4





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