A Useful Spreadsheet and GFC Handicapping Tool

Dean Sigler Electric Powerplants, GFC, Sustainable Aviation 1 Comment

For analyzing the greatest economy from an aircraft’s design, Howard Handelman, a highly-engaged reader of this blog, provides a link to his web site, which includes a downloadable spreadsheet he has devised that will give the inquiring reader hours of enjoyment. Handelman, self-described as, “just a retired IT guy,” with “weak math skills,” but a “compulsively curious” nature, has devised a tool for analyzing any airplane’s performance based on a few known variables, and which he has applied to many of the Green Flight Challenge’s aircraft. The basis for his analyses is his “triangle tool,” a wedge that can be used to help design propellers, “test [the] truth” of claimed aircraft performance, and estimate brake horsepower in real life circumstances (at …

Greenelis GFC Contender Makes Paris Air Show

Dean Sigler Diesel Powerplants, Sustainable Aviation 4 Comments

A trio of plane makers was seen pushing a trailer with an aeronautical looking object into the Paris Air Show last week.  It turned out to be the Greenelis PXLD, a Green Flight Challenge flyer, and it looked a great deal like the offspring of the Dieselis and the Gazaille, two French light sport aircraft powered by converted Diesel automobile engines and designed by Paul Lucas. Like its predecessors, it is made of wood and plywood, but in this case has a wing spar built of carbon fiber with “innovative geometry” and a wing covered with plywood.  Greenelis’ fuselage has wooden formers and longerons, and like its forbearers, a plywood shell giving its aerodynamic form. The 11 meter (35.2-foot) span, Two-place side …