![[Credit: AdobeStock]](https://www.kitplanes.com/wp-content/uploads/2026/08/AdobeStock_51865118.jpg?w=534&h=462&crop=1 "FAA MOSAIC Rule Fully Implemented")
![My 36 year old clipboard from when I started at Boeing. Engineering ruler and fastener/fastener hole cheat sheets. [Credit: Andrew Robinson]](https://www.kitplanes.com/wp-content/uploads/2026/08/Liaison_clipboard.jpg?w=265&h=198&crop=1 "What Is a Liaison Engineer?")
![At Sun ‘n Fun 2026, Viking Aircraft Engines surprised the crowd with its first complete kit — the V-42, a high-wing twin powered by two Honda-based engines. Here’s an early look. [Credit: Andrew Robinson]](https://www.kitplanes.com/wp-content/uploads/2026/08/P1020293.jpg?w=265&h=198&crop=1 "Viking V-42 Twin")
![A STOL CH 750 [Credit: Mike Davenport]](https://www.kitplanes.com/wp-content/uploads/2026/08/STOL-CH-750.jpg?w=265&h=198&crop=1 "Why Are So Many Airplanes Yellow?")
![A Zenith STOL CH701 on Zenair amphibious floats rests on a sandbar on the Caribbean island of Guadeloupe. [Credit: Zenith Aircraft]](https://www.kitplanes.com/wp-content/uploads/2026/08/zenair-floats-STOL_CH_701a-Topaz-Gigapixel-2x-scale-Topaz-Gigapixel-2x-scale.jpg?w=265&h=198&crop=1 "Zenith STOL CH 701 at 40: The Iconic ‘Sky Jeep’ Design Audit"){kind=tracking}
The Dawn Patrol
Dick and Sharon Starks and The Dawn Patrol make their annual, magical pilgrimage to AirVenture Oshkosh. Mix in a big, surly storm, the Wild Snorting Piglet, and an Air Force Brigadier General, and you've some something to write home about.
Engine Beat
How are your cylinders doing? A differential compression test can uncover any problems-almost before they start. Steve Ells explores what the results mean, and what to do about them.
Ask the DAR
When can a project be registered as Experimental? Can a non-complying airplane be registered as an LSA? How is the 51% criterion determined? Answers to these questions come from DAR Mel Asberry.
Light Stuff
The Australian developers of the Jabiru engine wanted to build a sport airplane. But when their original engine choice went off the market, they developed its replacement, too. By Dave Martin.
Letters
Duck, Its a Canard As a Velocity builder, I sat down to enjoy Augusts canard article: Rutans Take. All was going well until...
Around the Patch
Editor-in-Chief Marc Cook saw some reasons to be cheerful at AirVenture, especially the upcoming refinement of the 51% rule for homebuilders.
What’s New
Zenith offers a reduced price for its STOL CH 701 kit, featuring the 85-hp Jabiru 2200A engine. Dynon offers a rebate for Blue Mountain EFIS owners who trade in for the new SkyView units, as well as special upgrade pricing. Edited by Mary Bernard.
Build a Bear: Moving Right Along
It’s starting to look like a Sport Cub. Dave Prizio gets to work on the systems and finishes the wings.
The Independence Project: Forward to the Fuselage
Dave Martin marches ahead with the Van’s RV-12, inventorying fuselage hardware, attaching the sideskins, working on other subassemblies and mating the tail cone to the fuselage. Progress!
In Case You Missed It
To Launch a Light Sport
This month builder Bob Fritz searches for a better alternative to last-century circuit technology for his panel and finds it in a Polyfuse.
