John Hupe’s AC-119K Stinger Flies Again
In 2012, John Hupe's restored RC AC-119K Stinger flew again, 40 years after its last flight. The event celebrated his legacy as an Air Commando.
F3A World Championships
The F3A World Championships took place September 10–18, 1999, in Holley, Florida, featuring 94 competitors from 35 countries. Sebastian Heger of Germany won, while the US team clinched the championship.
Radio Control: Sport and Aerobatics
TWO MONTHS AGO I wrote about locating the proper center-of-gravity on a conventional airplane. Last month I extended it to cover canard airplanes and flying wing airplanes. Then I sat back, thinking that the subject was done for a while. Not so. In addition to requests for more information, the mail bag has been full of lots of good questions. Rather than sending answers to only the questioners, I decided to include one of the better questions and my answer here. Many of the questions related to wings which did not have straight leading and trailing edges. A good example was sent by Bob Hanson (Colorado Springs, CO) who was a former club member and president of my club (Eglin Aero Modellers). Bob is working on a Sport Scale Fairchild A-10 and wanted to know how to apply the equations I'd published earlier. The A-10 wing looks something like Figure 1. You will note that the center section of the wing is rectangular, while the outboard sections are swept and tapered.
Radio Control: Sport and Aerobatics
THE LONGER I write this column (13 years and counting), the more I get recurring questions. Outside of the downwind turn, the most common question is probably, "How do I figure out where to place the center-of-gravity on my new plane?" The obvious reason that the question keeps coming in is that new RC fliers enter the hobby all the time, and they've never read the answer in previous columns because they joined since it last appeared. It's time to redo the center-of-gravity calculation discussion. I hope to hit a happy medium between boring you with excessive mathematics and insulting your intelligence. It's difficult to do, because the background of RC column readers is so varied.
Radio Control: Sport and Aerobatics
FIRST I want to rectify an error. In my August 1988 column I discussed how to determine the center-of-gravity of a canard (tail-first) airplane. I noted that the sign of the term involving the tail length had to be changed, and it should be multiplied by two when converting the equation from a tail-last equation to a canard equation. Unfortunately, when the canard equation appeared in the August column, the "2" multiplier was missing. It's really necessary to get that canard center-of-gravity equation printed correctly. It appears below as Equation 4.a.
