Originally Posted by
phlpsfrnk
Most barometric altimeters measure in MSL, what type of altimeter are you using? The current F5 open (Radio Control Flight Electric) "World record ID 16072" is 3843 m (12,608 ft) by Patrick Vallet of France in 2010-08-06. Have you had your claim ratified yet?
http://www.fai.org/records/aeromodelling-spacemodelling
Regards
Frank
If I'm not mistaken, but, Mr. Vallet used a very large sailplane with solar cells on it;s wings and he also used high powered binoculars, to aid in his spotting.