<http://webisa.webdatacommons.org/241793601>	<http://www.w3.org/ns/prov#value>	"Both DARPA and GBA agree the biggest technical challenge in the Heliplane programme is stability and control of the rotor at high forward speed. ???Control is a risk area." .
<http://webisa.webdatacommons.org/241793601>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/73330328>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/241793601> .
<http://webisa.webdatacommons.org/241793601>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .