About: http://webisa.webdatacommons.org/190451065

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Most of your questions, except the fact that we now have carbon fiber materials, are discussed from the perspective of gliders.
http://www.w3.org/ns/prov#wasQuotedFrom	diydrones.com