The KR is certainly an efficient airframe with an efficient airfoil. If I run the same efficienty calc as Larry ran, using my Continental A75 turning 2450 RPM (redline is 2600) turning my 72x36 Culver prop, theoretical 100% efficiency would move the airplane through the air at 167 MPH. I'm just a little off that pace though. I cruise at a comfortable 70 or so, which means the prop is only 42% efficient in pulling the plane through the air. The rest of its work is spent beating the air into submission while dragging a strut-braced, wire-braced, open-cockpit wood-and-fabric 1929 design through the air and burning about 4 gallons of avgas per hour to do it. Most any KR is at least twice as efficient.
Oscar Zuniga Medford, OR Air Camper NX41CC ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/
