[rcsoaringdigest] The New RC Soaring Digest | June, 2023 | Vol. 38, No. 6

We end where we began. This month's cover was taken by Bob Hirsch in April of this year, who caught Aaron Scott Wallace and his classic Aquila Grande amongst the wild flowers atop everybody's bucket list soaring site, Torrey Pines.

June, 2023 Volume 38, No. 6

We have another great batch of articles for you this month—we encourage you to click any of the stories below to go straight to that article and start reading...

The Launch Zone

In The Air All (good?) things must come to an end. Terence C. Gannon Jun 03 · 7 min read "It is with a mixture of regret and relief that after 30 issues of the New RC Soaring Digest, I announce this will be my last. I anticipate for the vast majority of you who truly enjoyed the monthly dose of commercial-free RC soaring journalism from around the globe, this will be disappointing news ..." Letters to the Editor An exciting new aircraft takes to the skies for the first time. The New RC Soaring Digest Staff Jun 02 · 5 min read "I wanted to share a project that I have just maidened. This is a SZD-9 Bocian with a 4.5m wingspan which is very special, because it is dedicated to slope aerobatics. It is equipped with some unusual features to be able to perform both old-timer-slow-and-smooth trajectories and more aggressive tricks. It is an entirely wooden structure and ..."

Features

The Kirby Gull Fred Slingsby's gorgeous gull-wing at 1:3.9-scale. Chris Williams May 25 · 4 min read "This is my second foray into the world of the Slingsby Gull, the previous being a much larger version of the Gull 4 replica. I've kept pretty much to scale, other that the fact that the blue of the full-size is lighter than I have used, due to the fact that the film that covers the flying surfaces is available only in a limited range of colours ..." Iceland Open F3F 2023 Challenging, chilly conditions lead to a top five sweep by the British contingent. Sverrir Gunnlaugsson May 25 · 5 min read "Saturday April 29, 2023 started off bright and early with blue skies and temperature getting close to freezing but with the wind blowing straight on the slope in Helgafell. We were bothered in the beginning by a faulty audio jack on the CD computer but after finding out what the problem was we managed to ..." Twist Distributions for Swept Wings Part 5: A comparative look at the twist distributions formulated by Irv Culver and Walter Panknin along with a few final conclusions. Bill Kuhlman May 26 · 12 min read "First, a small digression is necessary in order to understand one remaining concept, the «middle effect.» The Hortens' later designs included geometric modifications aimed at reducing or eliminating the «middle effect.» Irv Culver's twist distribution is specifically formulated to eliminate the reduction in lift near the center of a swept back wing. Interestingly, the Hortens and Culver are trying to counter two different phenomena ..." Project ALTius Part V: Practical experiments in FDM 3D-printing. Tiberiu Atudorei May 31 · 16 min read "Last time I concluded with «next month, it's back to the nuts-and-bolts»: I hope you didn't take that literally. Instead of «nuts-and-bolts» you will have to settle for some «nozzle-and-plastic». That's right: time to do some old-fashioned FDM (fused deposition modelling) 3D-printing! Don't worry, we will have several parts in the future with hardware laser cutters and 3D-printers to help prepare you ..."

Ongoing Series

Soaring the Sky Podcast E131: Engineered to Soar — Adriana's Aviation Adventure Chuck Fulton Jun 02 · 4 min read "Born in Guadalajara, Mexico, Adriana Barragan grew her passion for life, beauty, science and freedom. During her childhood and teens, she was exposed to disciplined arts and sports that would let her develop her spirit and realize the power of the mind ..." Condor Corner Kato and the Ghosts Scott Manley Jun 02 · 6 min read "After two years and 80 training flights in the club environment, without earning his private pilot/glider certificate, Mark Griffith was beginning to wonder «what it was he didn't know». Having seen my lesson sequencing chart in Soaring magazine and been impressed with its organization and completeness ..." Very Simple Spray Paint Rack Mere minutes to make but 30+ years to get around to it. Tom Broeski Jun 03 · 3 min read "I've been needing a spray paint rack for years — I have a hundred spray cans on various shelves here and there. So, I finally built one. I had some 3/8" dowels, an eight foot piece of 1x6 and a piece of scrap paneling. It took about 35 minutes to make but 30+ years to get around to it. I cut the 1x6 in half and clamped the two pieces together. I measured down a couple of inches and drew a line across the board ..."

Retrospectives

Stamps That Tell a Story Honouring the Košava, a classic design by Miloš Ilić and Adrian Kisovec. Simine Short Jun 02 · 4 min read "The day before the opening ceremony of the 13th World Soaring Championships in Vrsac, the Yugoslav Post Office, Philatelic Services, issued a souvenir sheet with nine stamps of the same design. The postage stamp on the left shows the Košava two-seater high-performance sailplane. ..." The History of Electric Flight Part II: The steady evolution of electric RC gliders at Graupner. Mike Goulette May 29 · 7 min read "In Part I of this series I covered the early history of electric flight in Germany, led by Fred Militky, Chief Designer at the German Graupner model aircraft company. As a footnote to that early development of free flight models, in the March 1964 Aeromodeller magazine, it was reported that Militky had been able to ..."

That's a Wrap!

The Trailing Edge Happy trails. The New RC Soaring Digest Staff Jun 02 · 2 min read "By now you will likely have read the news which The Ed broke in his In the Air column ... this month. If not then you won't know that this is, in fact, the last issue of the New RCSD. To be candid, we really don't know what to say, so we'll let Dale Evans do the speaking for us ..."

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