Presentations
EFLAPS meetings include
formal and informal presentations on a wide variety of
subjects. Here are a few of the presentations given at
past meetings. Links are to ZIPped folders containing
the slideshow (PDF) and accompanying commentary (DOCX)
when available, or to individual files.
2026
January: Bill Kuhlman, Introduction to Tailless
RC Sailplanes Part 1
All about the tailless
"plank" planform
Link to slide and commentary
February: Bill Kuhlman, Introduction to
Tailless RC Sailplanes Part 2
All about swept wing
tailless planforms
Link to slideshow and
commentary
April: Dan Benson, Moderator, ELRS/Edge TX
Part 1
An introduction ExpressLoRa
and flashing ELRS receivers
Link to slideshows,
videos, and handout
May: Dan Benson, Moderator, ELRS/Edge TX Part
2
An
introduction ExpressLoRa and flashing ELRS
transmitters
Link to slideshow
July: Larry Dunn, All About Batteries
A discussion of battery
types, and the care and feeding of Lithium cells
Link to slideshow and
handouts
September Bill Kuhlman, Aircraft Structures
Part 1
The forces and stresses
placed on full size aircraft, and the structures used to
construct integrated load paths
Link to
slideshow and commentary
October: Bill Kuhlman, Aircraft Structures
Part 2
How the forces and stresses examined in Part 1 are
adapted for miniature aircraft structures
Link to
slideshow, commentary, and resources
2025
March: Bill Kuhlman, Winglets
How winglets work, and the
variables evaluated during their design
Link to slideshow and
commentary
April: Norbert Ecker, My Favorite Airplanes
Part 1
A look at aviation history
until 1929
Link
to slideshow and notes
May: Norbert Ecker, My Favorite Airplanes Part
2
A look at aviation history
1930-1959
Link to
slideshow and notes
June: Norbert Ecker, My Favorite Airplanes
Part 3
A look at
aviation history 1960-1989
Link
to slideshow and notes
July: Norbert Ecker, My Favorite Airplanes
Part 4
A look at aviation
history 1990 -present
Link
to slideshow and notes
2024
February: Wayne Duncan, The History of RC
A look at radio control systems and aircraft from the
early days
Link to
slideshows
March: Larry Dunn, CG & Trim
Link to
slideshow
April: Bill Kuhlman, Understanding Polar
Diagrams Part 1
Exploring the variables depicted in a polar diagram
Link
to slideshow, commentary, and supplement
May: Bill Kuhlman, Understanding Polar Diagrams
Part 2
Applying data from polar diagrams to determine miniature aircraft performance
Link
to slideshow, commentary, and handout
June: Dan Benson, 3D Printing
An introduction to the machines, materials, and software, aimed at the beginner
Link to
slideshow, video and handout
July: Bill Kuhlman, The Evolution of Airfoil
Design
A comprehensive overview of airfoil design and development from the 18th through the 21st Century
Link to
slideshow, commentary, and video
September: Larry Dunn & Bill Kuhlman, The
Evolution of the 2 Meter Class
Design and construction trends from the early days of the 2 Meter Class through the present
Link
to slideshow, commentary, and handout
2023
July: Philip Randolph, Aerodynamic Lift
A comprehensive chronological overview of the various
theories for aerodynamic lift.
Link to slideshow and notes