PK-77 HyperLOC 835 Fin Set

The alignment holes matched my 3.90-inch mount tube perfectly, so installation took under an hour. These 1/4-inch fins feel rock-solid and I'm confident they'll handle the high-speed flights I've got planned for this build.

The 1/4-inch thickness gives these fins a reassuringly solid feel, and they seated flush against the motor mount tube with no gap. Pre-drilled holes saved me a chunk of build time, and the fit on my 3.90-inch airframe was spot on.

The mounting holes lined up perfectly with my 3.90-inch motor mount tube—zero extra sanding needed. Cut through the air clean on my last flight, and the 1/4-inch thickness feels like it'll survive some rough landings.