About: http://webisa.webdatacommons.org/192826907

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	These systems were a step up from fixed-pitch propellers but lacked a compensation mechanism for the varying engine loads that occur with climbs, descents, or engine power changes.
http://www.w3.org/ns/prov#wasQuotedFrom	aopa.org