![Oshkosh is more popular than ever with three-quarters of a million people in attendance at AirVenture 2026. [Credit: LeRoy Cook]](https://www.kitplanes.com/wp-content/uploads/2026/09/IMG_7321-Topaz-Gigapixel-2x-scale.jpg?w=534&h=462&crop=1 "Wide World of Airplanes"){kind=tracking}
![Maintenance technician William Vergonet conducts an inspection on a Cub. [Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/09/IMG_3535.jpg?w=265&h=198&crop=1 "Post-Flight Maintenance Debrief")
![Pat McKiernan has found that he and his dad who built this beautiful RV-7 simply learned to enjoy the build. [Credit: Bill Wilson]](https://www.kitplanes.com/wp-content/uploads/2026/08/Builder.jpg?w=265&h=198&crop=1 "Life Lessons From Building an Airplane")
![[Credit: AdobeStock]](https://www.kitplanes.com/wp-content/uploads/2026/08/AdobeStock_51865118.jpg?w=265&h=198&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?")
Light Stuff
After studying Experimental aircraft, the National Transportation Safety Board developed 16 recommendations. Roy Beisswenger outlines the good, the bad and the still-needed.
Letters
Need to Vent?In Paul Dye’s article he states: “There is no real way it can pull the tip top amount of fuel out...
Avidyne IFD540
Avidyne's new IFD540 GPS navigator will offer an easy replacement for Garmin GNS users.
Bringing a Baby Great Lakes Back
After developing an interest in aerobatics, one builder acquires an airplane that allows him to fully indulge that fascination (after a few hundred hours of rebuilding). By Ron Bearer Jr.
Firewall Forward: Oil Coolers and Oil Lines
The right oil cooler, installed correctly, can maximize your engine’s life. Of course, you’ll also need to consider crankcase breathers, oil separators, oil filters, oil lines and connections.
Flight Testing
Even current pilots need to hone specific skills before attempting a first flight in their homebuilts. There's only one way to do that: practice. And then practice some more.
Build It Better: Building to Requirements
It can be tough to keep a homebuilt project from ballooning out of control when so many tempting innovations and extras catch your eye along the way. Having a specific vision from the outset can help keep things on track.
Plexiglas Play
The advantages of Plexiglas are many, but there are some important things to know about working with it and maintaining it.
Ask the DAR
Do I qualify as a Sport Pilot if I’m already a Private Pilot? Does the installation of skis constitute a major change? How can I get an N number? DAR Mel Asberry answers these questions.
In Case You Missed It
Letters
Ignition AdvanceRegarding Nigel Speedy's article , I had a friend doing a similar experiment...
AN960 Washers, the Penny and My Thoughts
Not a week (sometimes a day) went by during my Sonex career that I...
Flight Review: The Rand KR-2
Bob Grimstead sampled the diminutive Rand KR-2 and found it demanding to fly in some respects but also thoroughly enjoyable.