![The 160 hp turbocharged Rotax 916iS is a four-stroke piston engine with redundant electronic fuel injection and ignition. [Credit: BPR Rotax]](https://www.kitplanes.com/wp-content/uploads/2026/05/PIC_916-iS_iSc-2.jpg?w=534&h=462&crop=1 "2026 Engine Buyer’s Guide")
In Case You Missed It
Wind Tunnel
Stall flutter is the result of the elastic axis of a wings surface being aft of the aerodynamic center, resulting in instability. A vicious cycle of lift, twist, stall and lift may ensue.
Homebuilt or Store-Bought?
Raising the bar for RV-10 interiors to an entirely different level. By Bruce Eicher.
DIY Firewall Penetration
Properly seal the firewall penetrations to keep fumes from entering the aircraft cabin.
Letters
Check Those Airboxes!Upon seeing the picture in Amy Laboda's airbox installation , we were...